{"id":254158,"date":"2026-07-11T12:36:43","date_gmt":"2026-07-11T09:36:43","guid":{"rendered":"https:\/\/pogodnik.com\/?p=254158"},"modified":"2026-07-11T12:36:43","modified_gmt":"2026-07-11T09:36:43","slug":"north-america-heat-dome-us-canada-july-2026","status":"publish","type":"post","link":"https:\/\/pogodnik.com\/en\/news\/north-america-heat-dome-us-canada-july-2026","title":{"rendered":"North America Heat Dome Forecast: 111\u00b0F in Montana and Humidex 45 in Canada"},"content":{"rendered":"<style>\n.pogodnik-article.north-america-heat-dome-2026 {<br \/>  --pg-bg: #ffffff;<br \/>  --pg-text: #172033;<br \/>  --pg-muted: #536173;<br \/>  --pg-card: #f7f9fc;<br \/>  --pg-card-strong: #ffffff;<br \/>  --pg-border: #dce4ee;<br \/>  --pg-hot: #dc4c24;<br \/>  --pg-hot-dark: #922f18;<br \/>  --pg-hot-bg: #fff3eb;<br \/>  --pg-hot-text: #7c2d12;<br \/>  --pg-canada: #c81e3a;<br \/>  --pg-canada-bg: #fff1f3;<br \/>  --pg-canada-text: #831843;<br \/>  --pg-blue: #2457c5;<br \/>  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background: var(--pg-bg);<br \/>  }<\/p>\n<p>  .pogodnik-article.north-america-heat-dome-2026 th {<br \/>    background: var(--pg-card-strong);<br \/>  }<\/p>\n<p>  .pogodnik-article.north-america-heat-dome-2026 a {<br \/>    color: var(--pg-blue);<br \/>  }<\/p>\n<p>  .pogodnik-article.north-america-heat-dome-2026 .app-button {<br \/>    background: #22c55e;<br \/>    color: #052e16;<br \/>  }<br \/>}<br \/><\/style>\n<article class=\"pogodnik-article north-america-heat-dome-2026\">\n<header class=\"hero\">\n<h1>North America Heat Dome Forecast: 111\u00b0F in Montana and Humidex 45 in Canada<\/h1>\n<p class=\"lead\">A powerful cross-border heat dome is expanding across the western and central United States and into the Canadian Prairies. The most dangerous phase will unfold from July 11 through July 15, with temperatures above 100\u00b0F spreading from the Great Basin and Rocky Mountains into Montana, Wyoming, Colorado and the Dakotas. North of the border, southern Saskatchewan and Manitoba face a multi-day heat event with highs in the mid to upper 30s Celsius and humidex values approaching 45.<\/p>\n<div class=\"tldr-block\">\n<p><strong>U.S. peak:<\/strong> Sunday, July 12, is expected to be the hottest day across central and eastern Montana into North Dakota. Highs of 100\u2013110\u00b0F are widespread, with isolated locations above 110\u00b0F.<\/p>\n<p><strong>Canada peak:<\/strong> southern Saskatchewan and Manitoba face their most dangerous heat from July 11\u201313. Regina and Winnipeg may reach 36\u00b0C, while southwestern Manitoba could reach 38\u00b0C.<\/p>\n<p><strong>Warm nights:<\/strong> nighttime temperatures will remain unusually high. Bismarck may stay near 77\u00b0F Sunday night, while Winnipeg may remain around 26\u00b0C.<\/p>\n<p><strong>When relief arrives:<\/strong> Saskatchewan and Manitoba should begin cooling from July 14, but heat risks may persist across the Northern Plains, Rockies and Great Basin into July 18\u201322.<\/p>\n<\/div>\n<\/header>\n<section><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-254162\" src=\"https:\/\/pogodnik.com\/cdn-cgi\/image\/quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/07\/usa.webp\" alt=\"usa heatdome\" width=\"1534\" height=\"1240\" srcset=\"https:\/\/pogodnik.com\/cdn-cgi\/image\/quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/07\/usa.webp 1534w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=300,height=243,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/07\/usa.webp 300w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=600,height=485,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/07\/usa.webp 600w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=768,height=621,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/07\/usa.webp 768w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=150,height=121,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/07\/usa.webp 150w\" sizes=\"auto, (max-width: 1534px) 100vw, 1534px\" \/><\/p>\n<h2>The heat dome in four numbers<\/h2>\n<div class=\"fact-grid\">\n<div class=\"fact-card\"><span class=\"fact-number\">111\u00b0F <\/span><span class=\"fact-label\">Forecast high in Billings, Montana, on Sunday, July 12<\/span><\/div>\n<div class=\"fact-card\"><span class=\"fact-number\">38\u00b0C <\/span><span class=\"fact-label\">Possible Sunday high in southwestern Manitoba<\/span><\/div>\n<div class=\"fact-card\"><span class=\"fact-number\">45 <\/span><span class=\"fact-label\">Forecast humidex in Winnipeg and southern Manitoba<\/span><\/div>\n<div class=\"fact-card\"><span class=\"fact-number\">15\u201325\u00b0F <\/span><span class=\"fact-label\">Temperature departure above normal in Montana and North Dakota<\/span><\/div>\n<\/div>\n<p>The event is being driven by a strong ridge of high pressure building northward from the Desert Southwest into the Intermountain West, Northern Rockies and Northern Plains. Inside the ridge, air sinks, compresses and warms. Clouds are suppressed, the ground receives intense sunshine and the same hot air mass remains trapped over the region.<\/p>\n<p>This is the atmospheric structure commonly described as a <strong>heat dome<\/strong>. It does not create identical temperatures everywhere. Dry desert locations experience extreme air temperatures, while more humid parts of the Plains and Canadian Prairies may record lower thermometer readings but more dangerous heat index or humidex values.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pogodnik.com\/cdn-cgi\/image\/quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/heatdome-copy.jpg\" alt=\"Heat dome forecast across the United States and Canada\" width=\"1642\" height=\"904\" \/><\/p>\n<\/section>\n<section class=\"warning-block\">\n<h2>July 11\u201315: the main heat dome timeline<\/h2>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Date<\/th>\n<th>Main risk area<\/th>\n<th>Expected conditions<\/th>\n<th>Main hazard<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Saturday, July 11<\/strong><\/td>\n<td>Great Basin, Utah, Nevada, Colorado, Wyoming, Montana, North Dakota, southern Saskatchewan and Manitoba<\/td>\n<td>Widespread 95\u2013107\u00b0F in the U.S.; 33\u201334\u00b0C in Regina, Saskatoon and Winnipeg<\/td>\n<td><span class=\"tag tag-red\">Rapid heat buildup<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Sunday, July 12<\/strong><\/td>\n<td>Montana, Wyoming, North Dakota, western South Dakota, southern Saskatchewan and southern Manitoba<\/td>\n<td>100\u2013110\u00b0F, locally above 110\u00b0F in the U.S.; 36\u201338\u00b0C in parts of Canada<\/td>\n<td><span class=\"tag tag-red\">Peak extreme heat<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Monday, July 13<\/strong><\/td>\n<td>Dakotas, Central Plains, Upper Midwest, southern Manitoba<\/td>\n<td>Triple-digit heat persists; Winnipeg near 35\u00b0C and Bismarck near 104\u00b0F<\/td>\n<td><span class=\"tag tag-yellow\">Heat and warm nights<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Tuesday\u2013Wednesday, July 14\u201315<\/strong><\/td>\n<td>Rockies, Great Basin, Northern Plains and parts of the Upper Midwest<\/td>\n<td>Some Canadian relief, but continued major heat across parts of the U.S.<\/td>\n<td><span class=\"tag tag-blue\">Uneven cooldown<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>July 18\u201322<\/strong><\/td>\n<td>Northern and Central Plains, Rockies, Northern Great Basin and parts of the West<\/td>\n<td>Lower overall intensity, but continued elevated risk of extreme heat<\/td>\n<td><span class=\"tag tag-yellow\">Lingering heat risk<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<section class=\"us-block\">\n<h2>United States forecast: where the heat will be most intense<\/h2>\n<p>The most exceptional temperatures are expected from eastern Montana into North Dakota, where Sunday afternoon values may exceed 110\u00b0F. The National Weather Service expects the core of the ridge to produce temperatures 15\u201325\u00b0F above the mid-July average.<\/p>\n<p>Major to Extreme HeatRisk covers parts of Montana and Wyoming, with Extreme Heat Warnings also issued across sections of Utah, Colorado, Nevada and North Dakota. The combination of high daytime temperatures and unusually warm nights will increase cumulative heat stress.<\/p>\n<p>Residents who are not acclimatized may be especially vulnerable. Many areas of the Northern Plains experienced near-normal or cooler conditions during June, so the abrupt transition to triple-digit heat will place additional strain on people, livestock and infrastructure.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-253927\" src=\"https:\/\/pogodnik.com\/cdn-cgi\/image\/quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa-scaled.webp\" alt=\"July 2026 Forecast for the U.S. and Canada\" width=\"2560\" height=\"1378\" srcset=\"https:\/\/pogodnik.com\/cdn-cgi\/image\/quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa-scaled.webp 2560w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=300,height=162,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa.webp 300w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=600,height=323,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa.webp 600w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=768,height=414,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa.webp 768w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=1536,height=827,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa.webp 1536w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=2048,height=1103,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa.webp 2048w, https:\/\/pogodnik.com\/cdn-cgi\/image\/width=150,height=81,fit=crop,quality=80,format=auto,onerror=redirect,metadata=none\/wp-content\/uploads\/2026\/06\/usa.webp 150w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><\/p>\n<\/section>\n<section>\n<h2>Major U.S. locations: city-by-city forecast<\/h2>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Location<\/th>\n<th>July 11<\/th>\n<th>July 12<\/th>\n<th>July 13<\/th>\n<th>Main concern<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Billings, Montana<\/strong><\/td>\n<td>107\u00b0F \/ 42\u00b0C<\/td>\n<td>111\u00b0F \/ 44\u00b0C<\/td>\n<td>100\u00b0F \/ 38\u00b0C<\/td>\n<td><span class=\"tag tag-red\">Extreme heat and fire weather<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Bismarck, North Dakota<\/strong><\/td>\n<td>100\u00b0F \/ 38\u00b0C<\/td>\n<td>104\u00b0F \/ 40\u00b0C<\/td>\n<td>104\u00b0F \/ 40\u00b0C<\/td>\n<td><span class=\"tag tag-red\">Hot nights near 77\u00b0F<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Denver, Colorado<\/strong><\/td>\n<td>98\u00b0F \/ 37\u00b0C<\/td>\n<td>97\u00b0F \/ 36\u00b0C<\/td>\n<td>98\u00b0F \/ 37\u00b0C<\/td>\n<td><span class=\"tag tag-yellow\">Persistent high-elevation heat<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Las Vegas, Nevada<\/strong><\/td>\n<td>111\u00b0F \/ 44\u00b0C<\/td>\n<td>109\u00b0F \/ 43\u00b0C<\/td>\n<td>106\u00b0F \/ 41\u00b0C<\/td>\n<td><span class=\"tag tag-red\">Very hot nights near 88\u201389\u00b0F<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Zion National Park, Utah<\/strong><\/td>\n<td>About 110\u00b0F \/ 43\u00b0C<\/td>\n<td>About 109\u00b0F \/ 43\u00b0C<\/td>\n<td>About 106\u00b0F \/ 41\u00b0C<\/td>\n<td><span class=\"tag tag-red\">Dangerous hiking conditions<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Wasatch Back, Utah<\/strong><\/td>\n<td>Near 100\u00b0F \/ 38\u00b0C<\/td>\n<td>Near 102\u00b0F \/ 39\u00b0C<\/td>\n<td>Near 99\u00b0F \/ 37\u00b0C<\/td>\n<td><span class=\"tag tag-yellow\">Extreme Heat Warning<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The Northern Rockies and Plains are the most anomalous part of this event. Desert locations regularly experience extreme summer heat, but temperatures near or above 110\u00b0F in Montana are far less common and could challenge daily, monthly or all-time records.<\/p>\n<\/section>\n<section class=\"canada-block\">\n<h2>Canada heat warning: the dome crosses into the Prairies<\/h2>\n<p>Canada will not experience the same widespread 110\u00b0F air temperatures as Montana or Nevada, but the combination of heat and humidity could be equally dangerous in southern Saskatchewan and Manitoba.<\/p>\n<p>Environment Canada has warned of a long-duration heat event beginning Saturday and continuing through the weekend. Areas along and south of the Trans-Canada Highway face particularly muggy conditions, with humidex values approaching 45.<\/p>\n<p>The highest Canadian temperatures are expected Sunday, July 12. Southwestern Manitoba may reach 38\u00b0C, while Regina and Winnipeg are forecast near 36\u00b0C. Overnight temperatures will remain elevated, especially in Winnipeg, where Sunday night may stay close to 26\u00b0C.<\/p>\n<\/section>\n<section>\n<h2>Major Canadian locations: heat forecast and warnings<\/h2>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Location<\/th>\n<th>July 11<\/th>\n<th>July 12<\/th>\n<th>July 13<\/th>\n<th>Main concern<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Winnipeg, Manitoba<\/strong><\/td>\n<td>34\u00b0C \/ 93\u00b0F<\/td>\n<td>36\u00b0C \/ 97\u00b0F<\/td>\n<td>35\u00b0C \/ 95\u00b0F<\/td>\n<td><span class=\"tag tag-canada\">Humidex near 45<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Brandon and Spruce Woods, Manitoba<\/strong><\/td>\n<td>33\u00b0C \/ 91\u00b0F<\/td>\n<td>38\u00b0C \/ 100\u00b0F<\/td>\n<td>35\u00b0C \/ 95\u00b0F<\/td>\n<td><span class=\"tag tag-canada\">Orange heat warning<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Regina, Saskatchewan<\/strong><\/td>\n<td>34\u00b0C \/ 93\u00b0F, humidex 42<\/td>\n<td>36\u00b0C \/ 97\u00b0F<\/td>\n<td>31\u00b0C \/ 88\u00b0F<\/td>\n<td><span class=\"tag tag-canada\">Very high UV and heat stress<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Saskatoon, Saskatchewan<\/strong><\/td>\n<td>33\u00b0C \/ 91\u00b0F, humidex 41<\/td>\n<td>32\u00b0C \/ 90\u00b0F<\/td>\n<td>26\u00b0C \/ 79\u00b0F<\/td>\n<td><span class=\"tag tag-green\">Relief begins Monday<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Medicine Hat, Alberta<\/strong><\/td>\n<td>33\u201335\u00b0C \/ 91\u201395\u00b0F<\/td>\n<td>33\u201335\u00b0C \/ 91\u201395\u00b0F<\/td>\n<td>Near 32\u00b0C \/ 90\u00b0F<\/td>\n<td><span class=\"tag tag-canada\">Heat warning through weekend<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Calgary, Alberta<\/strong><\/td>\n<td>29\u00b0C \/ 84\u00b0F<\/td>\n<td>28\u00b0C \/ 82\u00b0F<\/td>\n<td>26\u00b0C \/ 79\u00b0F<\/td>\n<td><span class=\"tag tag-green\">Warm but outside the main core<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Edmonton, Alberta<\/strong><\/td>\n<td>Near 24\u00b0C \/ 75\u00b0F<\/td>\n<td>Near 23\u00b0C \/ 73\u00b0F<\/td>\n<td>Near 24\u00b0C \/ 75\u00b0F<\/td>\n<td><span class=\"tag tag-green\">Not in the main heat dome core<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<section class=\"storm-block\">\n<h2>The edge of the heat dome could produce severe storms<\/h2>\n<p>A heat dome does not mean every region stays dry. The northern and eastern edges of the ridge often become corridors for thunderstorms, damaging winds and flash flooding.<\/p>\n<p>A slow-moving front is producing repeated thunderstorms from the Central and Southern Plains into the Ohio and Tennessee valleys. Areas from Missouri and Oklahoma toward Kentucky, Tennessee and the southern Appalachians face a combination of high humidity, strong thunderstorms and locally excessive rainfall.<\/p>\n<p>In Canada, thunderstorms may develop near the edge of the Prairie heat. Hot, humid surface air can provide high instability, while an approaching front supplies lift and wind shear. The strongest storms could produce hail, damaging wind gusts and sudden heavy rain.<\/p>\n<ul class=\"list\">\n<li><strong>Montana and Wyoming:<\/strong> dry thunderstorms and gusty winds may increase wildfire danger.<\/li>\n<li><strong>Dakotas and Canadian Prairies:<\/strong> storms may form near the northern and eastern boundary of the ridge.<\/li>\n<li><strong>Central Plains:<\/strong> severe thunderstorms may develop where extreme heat meets cooler and more humid air.<\/li>\n<li><strong>Ohio and Tennessee valleys:<\/strong> repeated storms may cause flash flooding even where daytime heat is less extreme.<\/li>\n<\/ul>\n<\/section>\n<section class=\"warning-block\">\n<h2>Wildfire risk rises as heat and drought overlap<\/h2>\n<p>Extreme temperatures accelerate evaporation from soil and vegetation. In areas already experiencing drought, the heat dome can rapidly increase the flammability of grass, brush and forest fuels.<\/p>\n<p>Fire weather concerns are especially important in Montana, Wyoming, Utah, Nevada and the interior West. Billings is under a Fire Weather Watch on July 12 in addition to its Extreme Heat Warning.<\/p>\n<p>Canada also faces a compound hazard. Heat can overlap with wildfire smoke, particularly across parts of Alberta, Saskatchewan and Manitoba. When heat and smoke occur together, public-health guidance recommends prioritizing cooling while keeping indoor air as clean as possible.<\/p>\n<\/section>\n<section>\n<h2>Why the nights may be more dangerous than the afternoons<\/h2>\n<p>The most damaging heat waves are often defined by their nighttime temperatures. When the air remains hot after sunset, the human body cannot fully recover from daytime heat stress.<\/p>\n<p>Bismarck is forecast to remain near 77\u00b0F Sunday night. Winnipeg may stay near 26\u00b0C, or 79\u00b0F. Las Vegas may not fall below the upper 80s Fahrenheit.<\/p>\n<p>Warm nights are particularly dangerous for people without air conditioning, older adults, infants, pregnant people, outdoor workers and anyone with cardiovascular, respiratory or kidney disease.<\/p>\n<\/section>\n<section class=\"cool-block\">\n<h2>When will the heat dome weaken?<\/h2>\n<p>The first meaningful relief should arrive unevenly. Saskatchewan and Manitoba are likely to cool first as the hottest air shifts east and a front crosses the Prairies.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Region<\/th>\n<th>Peak heat<\/th>\n<th>First likely relief<\/th>\n<th>Forecast confidence<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Southern Saskatchewan<\/strong><\/td>\n<td>July 11\u201312<\/td>\n<td>Monday, July 13, in Saskatoon; July 14 in Regina<\/td>\n<td><span class=\"tag tag-green\">High<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Southern Manitoba<\/strong><\/td>\n<td>July 12\u201313<\/td>\n<td>Temperatures begin easing from July 14\u201315<\/td>\n<td><span class=\"tag tag-green\">High<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Montana and North Dakota<\/strong><\/td>\n<td>July 12\u201313<\/td>\n<td>Partial relief from July 14\u201315<\/td>\n<td><span class=\"tag tag-blue\">Moderate-high<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Colorado and central Rockies<\/strong><\/td>\n<td>July 11\u201315<\/td>\n<td>Only modest cooling through midweek<\/td>\n<td><span class=\"tag tag-yellow\">Moderate<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Great Basin and interior West<\/strong><\/td>\n<td>July 11\u201315<\/td>\n<td>Elevated heat may persist into July 18\u201322<\/td>\n<td><span class=\"tag tag-yellow\">Moderate<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Eastern United States<\/strong><\/td>\n<td>Earlier heat through July 11<\/td>\n<td>Clouds, rain and a backdoor front bring relief during the weekend<\/td>\n<td><span class=\"tag tag-green\">Moderate-high<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>NOAA\u2019s week-two outlook indicates that the ridge should gradually weaken after July 18. However, a moderate risk of extreme heat remains across portions of the Northern and Central Plains, Rockies and Northern Great Basin on July 18\u201319, with a broader slight-risk area continuing through July 22.<\/p>\n<\/section>\n<section>\n<h2>Heat dome meets summer travel, agriculture and major events<\/h2>\n<p>The heat wave arrives during one of the busiest travel periods of the North American summer and during the knockout stage of the 2026 World Cup. Airports, highways, outdoor fan zones and public-transport systems may face higher demand and heat-related disruptions.<\/p>\n<p>Agriculture is also exposed. Cattle and other livestock need continuous access to shade, ventilation and clean water. Crops can experience rapid moisture loss, while hot and windy conditions increase fire risk during harvesting and field work.<\/p>\n<p>Power demand is likely to rise sharply as households and businesses use more air conditioning. Utilities may ask customers to reduce non-essential electricity consumption during the late afternoon and early evening peak.<\/p>\n<\/section>\n<section class=\"app-block\">\n<h2>Track the heat dome in Weather Forecaster<\/h2>\n<p>The maximum temperature is only one part of the danger. Weather Forecaster provides hourly temperature, feels-like conditions, thunderstorms, rainfall, wind, air quality, fire maps and local weather changes for your location.<\/p>\n<p>Check the forecast before travelling, hiking, attending outdoor events, working outside or driving through wildfire-prone areas.<\/p>\n<p><strong><a class=\"app-button\" href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.bitltd.pogodnik\" target=\"_blank\" rel=\"noopener\">Download Weather Forecaster<\/a><\/strong><\/p>\n<\/section>\n<section>\n<h2>How to stay safe during extreme heat<\/h2>\n<ul class=\"list\">\n<li><strong>Reschedule outdoor work and exercise.<\/strong> Use early morning hours and avoid the hottest period of the afternoon.<\/li>\n<li><strong>Drink water regularly.<\/strong> Do not wait until you feel thirsty, especially during physical work.<\/li>\n<li><strong>Use air-conditioned spaces.<\/strong> Libraries, malls, community centres and cooling centres may be safer than an overheated home.<\/li>\n<li><strong>Check on vulnerable people.<\/strong> Older neighbours, people living alone and those without cooling may need direct assistance.<\/li>\n<li><strong>Never leave children or animals in vehicles.<\/strong> A parked vehicle can become deadly within minutes.<\/li>\n<li><strong>Protect outdoor animals.<\/strong> Provide permanent shade, ventilation and plenty of fresh water.<\/li>\n<li><strong>Watch for heat illness.<\/strong> Confusion, fainting, hot dry skin or loss of consciousness may indicate heat stroke and require emergency help.<\/li>\n<li><strong>Monitor smoke and air quality.<\/strong> During wildfire smoke, keep indoor air clean while prioritizing access to a cool environment.<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>Main forecast message<\/h2>\n<p>The July 2026 North American heat dome will be a cross-border event. The most exceptional air temperatures are expected in the western and north-central United States, while the greatest humidex stress will spread across the Canadian Prairies.<\/p>\n<p>The critical period is July 11\u201315. Billings could reach 111\u00b0F, Bismarck 104\u00b0F and parts of southern Manitoba 38\u00b0C. Winnipeg may experience humidex values near 45 and a Sunday night that remains close to 26\u00b0C.<\/p>\n<p>Relief will arrive first in Saskatchewan and Manitoba, but the pattern may not disappear completely. Elevated heat risk could persist across the Rockies, Great Basin and Northern Plains through July 18\u201322.<\/p>\n<\/section>\n<section>\n<h2>FAQ: U.S. and Canada heat dome forecast<\/h2>\n<div class=\"faq-item\">\n<h3>Where will the heat dome be strongest?<\/h3>\n<p>The strongest U.S. heat is expected across Montana, Wyoming, North Dakota, Utah, Nevada and Colorado. In Canada, the main risk zone is southern Saskatchewan, southern Manitoba and southeastern Alberta.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>When is the hottest day?<\/h3>\n<p>Sunday, July 12, is expected to be the hottest day across central and eastern Montana, North Dakota, southern Saskatchewan and southern Manitoba.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>How hot will Billings get?<\/h3>\n<p>The National Weather Service forecasts approximately 107\u00b0F on Saturday and 111\u00b0F on Sunday, followed by around 100\u00b0F Monday.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>How hot will Winnipeg get?<\/h3>\n<p>Winnipeg is forecast near 34\u00b0C Saturday, 36\u00b0C Sunday and 35\u00b0C Monday. Humidex values may approach 45, and Sunday night may remain near 26\u00b0C.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>What is the difference between heat index and humidex?<\/h3>\n<p>Both describe how hot conditions feel when humidity is included. The heat index is commonly used in the United States, while humidex is used in Canada.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>When will the heat wave end?<\/h3>\n<p>Saskatchewan and Manitoba should begin cooling between July 13 and 15. Montana and North Dakota may see partial relief around July 14\u201315, while elevated heat risk could persist in parts of the western and central United States through July 22.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>Will the heat dome cause thunderstorms?<\/h3>\n<p>Thunderstorms may develop along the northern and eastern edges of the heat dome. Some could produce damaging winds, hail, heavy rain or dry lightning that increases wildfire risk.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<h3>Which Canadian cities are outside the main heat core?<\/h3>\n<p>Calgary will be warm but less extreme, near 28\u201329\u00b0C over the weekend. Edmonton is forecast closer to seasonal levels in the low to mid-20s Celsius.<\/p>\n<\/div>\n<\/section>\n<section class=\"source-block\"><\/section>\n<p><strong><a href=\"https:\/\/pogodnik.com\/en\/news\/us-heat-wave-2026-historic-heat-dome-fourth-of-july\">Heat Dome US July 2026<\/a><\/strong><\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>A dangerous heat dome will spread across the western and central United States and Canadian Prairies from July 11\u201315, bringing 111\u00b0F in Montana, 104\u00b0F in North Dakota, 38\u00b0C in Manitoba and humidex values near 45.<\/p>\n","protected":false},"author":1,"featured_media":254162,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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