<body><div><figure><img src="https://img.particlenews.com/image.php?type=thumbnail_580x000&amp;url=049mY3_1DDJ9Gc500" alt="https://img.particlenews.com/image.php?url=049mY3_1DDJ9Gc500" width="1440" height="974" ><figcaption>The sun glows in a hazy sunset behind power lines at the edge of Casper on Friday, May 29, 2025. (Dan Cepeda, Oil City News)</figcaption></figure>CASPER, Wyo. — The National Weather Service in Riverton has issued an excessive heat wave warning for Casper and Natrona County as a historic heat wave begins raising temperatures into the 90s and even the triple digits through early next week. According to the NWS in Riverton, a powerful ridge of high pressure building northward from the desert southwest will center over the northern Rockies this weekend, trapping blistering air across the region. Meteorologists expect lower-elevation areas across central Wyoming to see temperatures well above what’s normal, with widespread highs reaching into the 100s as early as Saturday afternoon. NWS in Riverton officials reported clear skies and dry conditions across Wyoming, noting that the atmosphere will remain capped through the weekend. This eliminates any chance of rain or cooling cloud-cover. The heat is projected to peak on Sunday, which forecasters say could bring an all-time record high to several monitoring stations across Wyoming. The most extreme temperatures, approaching 110 degrees, are forecast for the Big Horn Basin, but Casper and lower elevations under 6,000 feet face an 80% chance of triple-digit temperatures. Additionally, the extreme heat will bring elevated to near-critical fire weather conditions over the next four days. Humidity levels are expected to drop into the single digits on Saturday afternoon, though light to moderate winds should prevent any critical fire thresholds from being reached initially. The NWS in Riverton says that conditions are expected to quickly worsen by Sunday afternoon as winds pick up across the state, with gusts reaching up to 30 mph. The combination of intense heat, extreme low humidity and gusty winds has prompted a fire weather watch, with critical red flag conditions likely on Sunday afternoon, as well as on Tuesday afternoon. A slight cooling trend is expected on Monday as temperatures drop and winds decrease, though lower elevations will still maintain an 80% chance of temps exceeding 100 degrees. Forecasters indicated that Tuesday will remain just as hot as the ridge of high pressure holds its position over the state, prompting meteorologists to consider extending the current excessive heat warning. Relief from the blistering heat isn’t expected until Wednesday, when the high-pressure system is expected to weaken a little bit. While temperatures will remain above the normal through next weekend, an influx of mid-level moisture by midweek is expected to bring back afternoon thunderstorms and increased cloud cover, beginning Tuesday and Wednesday. Residents are advised to say hydrated! <h2>Detailed Forecast</h2><ul><li>Today: Sunny and hot, with a high near 99. Northwest wind at around 9 mph.</li><li>Tonight: Mostly clear, with a low around 62. Northwest wind at 5–7 mph calming after midnight.</li><li>Sunday: Sunny and hot, with a high near 101. Breezy, with a light and variable wind shifting to the east-southeast at 11–16 mph in the afternoon. Winds could gust as high as 24 mph.</li><li>Sunday Night: Mostly clear, with a low around 65. Breezy, with a southeast wind at 12–17 mph calming after midnight. Winds could gust as high as 30 mph.</li><li>Monday: Sunny and hot, with a high near 101. Light and variable wind shifting to the east-northeast at 6–11 mph in the afternoon. Winds could gust as high as 20 mph.</li><li>Monday Night: Mostly clear, with a low around 65. East-northeast wind at 6–11 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.</li><li>Tuesday: Sunny and hot, with a high near 101. Breezy, with a light and variable wind shifting to the east at 10–15 mph in the afternoon. Winds could gust as high as 24 mph.</li><li>Tuesday Night: Mostly clear, with a low around 66. Breezy.</li><li>Wednesday: Sunny and hot, with a high near 100.</li><li>Wednesday Night: Partly cloudy, with a low around 64. Breezy.</li><li>Thursday: A slight chance of showers and thunderstorms. Sunny, with a high near 96.</li><li>Thursday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64.</li><li>Friday: Sunny, with a high near 96.</li></ul>More on the weather is available from the NWS in Riverton.</div></body>

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CASPER, Wyo. — The National Weather Service in Riverton has issued an excessive heat wave warning for Casper and Natrona County as a historic heat wave begins raising temperatures into the 90s and even the triple digits through early next week. According to the NWS in Riverton, a powerful...

Heat wave could bring triple-digit temperatures, critical fire risks to Casper

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CASPER, Wyo. — The National Weather Service in Riverton has issued an excessive heat wave warning for Casper and Natrona County as a historic heat wave beg

Heat wave could bring triple-digit temperatures, critical fire risks to Casper

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