Scattered Showers and Thunderstorms, Mainly North

General Overview: ACTIVE WEATHER PATTERN ACROSS THE NATION WITH WIDESPREAD RAIN AND THUNDERSTORMS AFFECTING THE CENTRAL PLAINS, MIDWEST, AND PORTIONS OF THE SOUTHWEST OVER THE NEXT SEVERAL DAYS. HEAVY RAIN AND POTENTIAL FLASH FLOODING WILL BE A CONCERN IN SOUTHERN CALIFORNIA. TEMPERATURES WILL TREND ABOVE NORMAL FOR MUCH OF THE WESTERN AND NORTHERN REGIONS WHILE COOLER AIR FILTERS INTO THE NORTHEAST BY THE WEEKEND.

EAST:  A high pressure system will initially bring relatively calm conditions to much of the Northeast and Mid-Atlantic regions. By Thursday into Friday, a cold front will push through the region, bringing rain and thunderstorm activity primarily along coastal areas. The front will gradually move offshore, allowing high pressure to build in for the weekend. The Southeast will remain largely dry with only isolated showers possible along the Gulf Coast and Florida peninsula. Coastal areas will see periods of rain as moisture flows in from the Atlantic.

Temperature Anomalies:

-Days 1-4: Near normal temperatures for most of the region with slight cooling in the Northeast by Sunday as cooler air filters in behind the passing front. Parts of the Mid-Atlantic may see slightly below normal temperatures with cooling of 2-4°F below average.

-Days 5-8: Temperatures trending slightly above normal across most of the region, with the Northeast and northern portions experiencing warming of 3-6°F above average. The Southeast will remain near normal.

-Days 9-10: Continued mild conditions with temperatures generally 2-4°F above normal across the Northeast and Mid-Atlantic, with near normal temperatures returning to the Southeast.

CENTRAL:  An active weather pattern will dominate the Central regions with multiple low pressure systems bringing widespread rain and thunderstorms. The Northern Plains and Upper Midwest will experience significant precipitation as a frontal boundary moves through the region. By Thursday and Friday, rain and thunderstorms will expand across the Central Plains and into the Midwest. The most widespread precipitation will occur across North Dakota, Minnesota, Wisconsin, Iowa, Nebraska, and Kansas. Some thunderstorm activity may become strong at times, especially in the Central Plains.

Temperature Anomalies:

-Days 1-4: Above normal temperatures for much of the region, particularly across the Northern Plains and Upper Midwest where readings will be 4-8°F above average. The Central Plains will see near to slightly above normal temperatures.

-Days 5-8: Continued above normal temperatures expanding across the entire region with the warmest anomalies (6-8°F above normal) focused on the Northern Plains and Upper Midwest.

-Days 9-10: Slight moderation in temperatures but still remaining above normal by 2-5°F across most of the region, with the warmest anomalies continuing in the Northern Plains.

WEST:  A significant weather system will affect the Southwest, particularly Southern California, where heavy rain and potential flash flooding will be possible. The system will bring widespread rain and thunderstorm activity to California, Nevada, Arizona, Utah, and portions of Colorado. The Pacific Northwest will experience periods of rain, especially along coastal areas. By the weekend, precipitation will shift eastward into the Rockies while high pressure builds over the Southwest. The most significant concern remains the heavy rainfall potential in Southern California where flash flooding is possible.

Temperature Anomalies:

-Days 1-4: Above normal temperatures across much of the region, particularly in the Pacific Northwest and Northern Rockies where temperatures will be 4-8°F above average. The Southwest will see near to slightly above normal temperatures.

-Days 5-8: Continued above normal temperatures throughout the West, with the warmest anomalies (6-10°F above normal) focused on the Northern Rockies, Idaho, and portions of Montana and Wyoming.

-Days 9-10: Slight moderation in temperatures but still remaining above normal by 2-5°F across most of the region, with the warmest anomalies continuing in the Northern Rockies.