US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
814 PM EDT Mon Apr 20 2020
 
Valid Friday April 24 2020 - Tuesday April 28 2020
 
Hazards:
- Heavy rain across portions of the Southeast, the Central/Southern Appalachians, the Mid-Atlantic, 
and the Tennessee Valley, Thu, Apr 23.
- Flooding possible across portions of the Southeast, the Southern Appalachians, and the Tennessee 
Valley.
- Flooding occurring or imminent across portions of the Mississippi Valley, and the Northern Plains.
- Flooding likely across portions of the Middle Mississippi Valley and the Northern Plains.
- Much above normal temperatures across portions of the Central/Southern Plains, the Rockies, the 
Northern/Central Great Basin, California, the Pacific Northwest, and the Southwest, Sat-Mon, Apr 
25-Apr 27.
- Much below normal temperatures across portions of the Great Lakes, the Mid-Atlantic, the 
Northeast, the Central Appalachians, and the Ohio Valley, Sun-Mon, Apr 26-Apr 27.
- Enhanced wildfire risk across portions of the the Southern Rockies, the Southern Plains, and the 
Southwest, Thu, Apr 23.
- Much below normal temperatures across portions of the Alaska Panhandle and mainland Alaska, 
Sat-Mon, Apr 25-Apr 27.
 
Detailed Summary:

The medium-range period (Thursday, 23 April to Monday, 27 April) will be highlighted by an area of 
much above normal temperatures over the Western U.S., much below normal temperatures over the Ohio 
Valley Lower Great Lakes, and heavy rain over parts of the Southeast.  Over Alaska, there will be 
an area of much below normal temperatures over the east-central interior mainland.

Low pressure over the Tennessee and Lower Mississippi Valleys and associated fronts will move 
northeastward to the northern mid-Atlantic Coast by Friday, and out over the Atlantic by Saturday.  
The associated cold front will aid in producing showers and thunderstorms from the Southeast into 
parts of the southern mid Atlantic on Thursday, producing an area of heavy precipitation over the 
region.  Meanwhile over the Western U.S., upper-level ridging will begin to move onshore over the 
West Coast on Friday and continue expanding inland toward the Plains/Southern Rockies by Sunday.  
The ridging will aid in producing temperatures that are about 12 degrees above normal, with the 
above normal warmth slowly expanding inland from Saturday into Monday.  The hazards map will depict 
an area of much above normal temperatures across most of the Western U.S., excluding the Northern 
Rockies, and stretching toward the Central Plains from Saturday into Monday.  In contrast, an area 
of upper-level troughing and Canadian high pressure will move over the Ohio Valley on Sunday into 
Monday.  The troughing and high pressure will aid in producing an area of much below normal 
temperatures over the Ohio Valley into the Lower Great Lakes.  There is also an area of critical 
fire hazard over parts of southern New Mexico into southwestern Texas on Thursday.  

Over Alaska, a deep upper-level trough will move over the eastern part of the Alaska mainland, 
followed by an area of cold high pressure fresh from the North Pole.  This air will linger in some 
form over the region through Sunday and Monday.  An area of cold weather will be depicted on the 
hazards map as an area of much below normal temperatures over the east-central interior mainland 
from Saturday into Monday. 

Ziegenfelder