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Short Range Public Discussion
(Caution: Version displayed is not the latest version. - Issued 0800Z Jul 30, 2021)
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Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Fri Jul 30 2021 Valid 12Z Fri Jul 30 2021 - 12Z Sun Aug 01 2021 ...Strong to severe thunderstorms with locally heavy rain across the northern Plains today and then toward the Midwest early on Saturday... ...More monsoonal moisture expected across the interior western U.S. with increasing focus over central Colorado and the northern Great Basin during the weekend... ...Excessive heat/heat advisories continue for the interior Pacific Northwest, central U.S. and Deep South while much cooler air overspreads the Northeast/Great Lakes into the Mid-Atlantic... A developing low pressure system currently near the New England coast will move steadily eastward into the Canadian Maritimes today, bringing much of the heavier rainfall away from New England. A large dome of cool air behind the low will usher across the Great Lakes and overspread much of the Northeast and down into the Mid-Atlantic during the weekend. This will bring welcome relief to the recent spell of summer heat and humidity across parts of these areas. Before the arrival of the cool air mass however, some showers and thunderstorms can be expected from upstate New York to northern New England near and ahead of a reinforcing cold front. Much of the heat and tropical humidity will be across the central Plains, the Deep South, and into the Southeast today ahead of the trailing front. A low pressure wave developing over the central High Plains is forecast to trigger organized thunderstorms that could become severe today across the northern Plains before moving toward the Midwest today into Saturday morning. In addition, heavy rain associated with the thunderstorms could trigger flash flooding. Over the western U.S., a persistent ridge of high pressure aloft will continue to sustain the excessive heat across interior Pacific Northwest into the weekend. Farther south, monsoonal moisture continues to bring much needed rainfall to the drought-stricken regions of the western U.S. The broad area of monsoonal showers and thunderstorms is expected to show increasing focus across central Colorado as well as spreading further north into the northern Great Basin during the weekend, where the threat of heavy rainfall will increase. Lastly, Air Quality Alerts are currently in effect for portions of Idaho, Montana, Wyoming, Colorado, Minnesota, and Iowa due to smoke from ongoing wildfires out west and in Canada being advected into their areas by the prevailing northerly-northwesterly winds. Kong Graphics available at