National Weather Service United States Department of Commerce

Widespread Excessive Heat and Humidity in Midwest to Spread to East Coast

High pressure building across the Central and Eastern U.S. will produce a dangerous combination of heat and humidity. Heat indices from unusually high dewpoints and well above normal temperatures may reach 110 to 115 degrees. In addition, near record warm low temperatures will limit recovery from hot daytime temperatures. Read More >

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Last Map Update: Thu, Jul. 18, 2019 at 12:03:32 pm MDT

National Weather Service Spokane, WAZoom
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National Weather Service Great Falls, MT
National Weather Service Pendleton, ORNational Weather Service Boise, IDNational Weather Service Pocatello, ID

A strong upper level Jet Stream associated with a trough of low pressure will bring strong and gusty southwest to wet winds across northwest Montana Wednesday and Thursday. Wind gusts of 40 – 50 mph is expected during the day on Wednesday, with slightly higher gusts forecast for Thursday. The strongest winds are expected to be in and around Glacier National park, especially at elevations above 5000 feet. Lake McDonald will also be quite choppy on both days.
The Northern Jet Stream will be over northwest Montana Thursday, bringing strong winds during the afternoon through 9pm. The strongest winds will be in higher terrain and exposed ridgelines, especially Glacier National Park, The Bob Marshall Wilderness, The Whitefish and Swan Ranges, and areas around Butte. Higher terrain winds will range 35 to 40 MPH with gusts up to 55 MPH along the divide. While the valleys will generally be 15 to 25 MPH gusting to 35 MPH. Expect choppy conditions on area lakes, especially ones susceptible to west winds. In addition, unsecured yard toys and furniture could be blown around.
A strong ridge of high pressure will be building over the Northern Rockies early next week. This will allow for temperatures to rise to above normal, and perhaps the warmest we’ve seen this season so far.

 

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