Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 251 AM EST Mon Feb 24 2025 Valid 12Z Mon Feb 24 2025 - 12Z Wed Feb 26 2025 ...Atmospheric River bringing heavy rain, gusty winds, and scattered instances of flooding to the Northwest through Monday... ...Showers and thunderstorms with locally heavy rainfall forecast for the Florida Peninsula Monday... ...Temperatures continue to slowly moderate across the southern U.S. as most of the country sees a period of above average, milder temperatures... Heavy rain, gusty winds, and the threat for flooding continues throughout the Pacific Northwest east through the northern Great Basin and Rockies as an active Pacific storm track/Atmospheric River impact the region. After precipiation waned a bit overnight following the passage of one system, another Pacific system will move inland through the day Monday bringing additional showers and thunderstorms. Mild Pacific air will keep snow levels high allowing for strong upslope flow along the Olympics, Coastal Ranges, and Cascades with heavy rainfall expected. A Slight Risk of Excessive Rainfall (level 2/4) is once again in effect today for portions of the region as additional rainfall on top of already saturated grounds may lead to some scattered instances of flooding. The system will continue eastward through Monday night bringing additional rainfall to the northern Great Basin and Rockies. Runoff from snow melt combined with the rainfall could lead to a few more isolated instances of flooding in the northern Rockies through Monday afternoon. Snow levels will fall behind the passage of a cold front and some snow may mix in for lower valley elevations into Monday night, though little to no accumulations are expected. High mountain elevations will see heavy snow, particularly the the northern Cascades and ranges of the northern Rockies. Very strong winds with gusts upwards of 60 mph are also expected throughout the region through Monday night. Conditions will finally start to dry out following the passage of this system with some lingering lighter and more scattered showers Tuesday. Very moist Gulf air flowing northward over the Florida Peninsula ahead of a low pressure system will lead to widespread showers and thunderstorms Monday. Locally very heavy downpours are expected and some isolated flash flooding will be possible for urban areas of South Florida. The storms should come to an end by early Tuesday morning as the system moves eastward into the Atlantic. Elsewhere, a pair of quick moving upper-level shortwaves will bring some light isolated to scattered rain/snow showers from the northern Plains east through the Great Lakes into the interior Northeast the next couple of days. Conditions will continue to moderate across the Southeast following the Arctic blast last week and lingering below average temperatures this weekend. Forecast highs Monday in the upper 50s to mid-60s are near or just above average for most locations. The entire Southeast will be above average by Tuesday as highs rise into the mid-60s to low 70s. A warm-up will also continue for the East Coast as highs rise into the 40s for New England and the northern Mid-Atlantic and the 50s and 60s for the southern Mid-Atlantic and Carolinas. Broad upper-ridging over the western and central U.S will keep most areas well above average by 10-15 degrees the next couple of days. Forecast highs range from the 40s and 50s in the Midwest, the 50s and 60s for the Great Basin and northern/central Plains, the 60s and 70s for California and the southern Plains, and the 80s for the Desert Southwest. One exception will be in the Northwest where average highs in the 40s and 50s are forecast following a cold front passage. Putnam Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php