US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
333 PM EDT Wed May 27 2020
 
Valid Saturday May 30 2020 - Wednesday June 03 2020
 
Hazards:
- Heavy rain across portions of the Pacific Northwest, Sat, May 30.
- Flooding possible across portions of the Southeast, the Great Lakes, the Northern Rockies, and 
the Northern Great Basin.
- Flooding occurring or imminent across portions of the Central Plains, the Northern Plains, the 
Great Lakes, the Northern Rockies, the Middle Mississippi Valley, the Mid-Atlantic, the Southeast, 
and the Southern Plains.
- Flooding likely across portions of the Central Plains and the Middle Mississippi Valley.
- Much above normal temperatures across portions of the Central Plains, the Central Rockies, the 
Central Great Basin, the Northern Plains, the Northern Rockies, the Southern Rockies, the Northern 
Great Basin, and the Southwest, Sat-Tue, May 30-Jun 2.
- Much above normal temperatures across portions of the Central Great Basin, the Northern Rockies, 
the Northern Great Basin, and the Southwest, Sat, May 30.
- Much above normal temperatures across portions of the Central Plains, the Middle Mississippi 
Valley, the Upper Mississippi Valley, and the Northern Plains, Mon-Tue, Jun 1-Jun 2.
- Enhanced wildfire risk across portions of the the Central Great Basin, Sat, May 30.
- Much above normal temperatures across portions of mainland Alaska, Sat-Tue, May 30-Jun 2.
 
Detailed Summary:

String upper ridging will slowly move out of the interior West this weekend and into the Plains. 
Record highs will be likely for some areas and possible for a larger area within the outlined areas 
that progress from west to east through the period. This will be the warmest/hottest temperatures 
so far this season for many locations. Temperatures in the 80s/90s (possibly near 100F) over the 
Great Basin and northern/central Rockies Saturday will replace cooler temperatures over the Plains 
(60s/70s) by early next week. The heat may weaken a bit by next Wednesday but temperatures will 
still be above normal by about 10 degrees from the lee of the Rockies to the Upper Midwest. 

Precipitation will generally be light over much of the CONUS during the period, with the exception 
of over coastal Oregon Saturday as an upper low and surface front over the Pacific lifts 
northeastward across the region. Southwesterly flow may act to enhance rainfall over favored 
terrain areas of the Coastal Range and Cascades. 

Over Alaska, above normal temperatures are forecast to persist over western areas through the 
Interior as an upper high meanders over the Arctic coast. A surface high over the Beaufort Sea will 
maintain a mild easterly flow across the land north of the Alaska Range. Ice jam flooding remains a 
concern over the North Slope as rivers have not yet broken up, while minor snowmelt flooding is a 
possibility in central and southern parts of the mainland. Farther south, a system over the North 
Pacific will bring some light rain to Southcentral and into the Panhandle. Amounts are forecast to 
remain light to modest which did not warrant a heavy rainfall area today, but there is some 
potential for heavier rain over the Panhandle.

Fracasso