US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
321 PM EDT Fri May 28 2021
 
Valid Monday May 31 2021 - Friday June 04 2021
 
Hazards:
- Heavy rain across portions of the Southern Plains, Mon-Wed, May 31-Jun 2.
- Flooding possible across portions of the Central Plains, the Southern Plains, and the Northern 
Great Basin.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Southern 
Plains, and the Northern Rockies.
- Flooding likely across portions of the Central Plains and the Middle Mississippi Valley.
- Much above normal temperatures across portions of California, the Northern/Central Great Basin, 
the Pacific Northwest, and the Northern Rockies, Mon-Thu, May 31-Jun 3.
 
Detailed Summary:

A low pressure system developing along the front range will go on to produce heavy rain over parts 
of the Southern Plains while high pressure will produce hot weather for the Northwest during the 
Medium Range period (Monday, May 31st - Friday, June 4th). An upper-level trough will eject a low 
pressure system from the Rockies into the Central Plains on Sunday. This system will move into the 
Central/Southern Plains on Memorial Day. An influx of Gulf moisture will produce heavy rain over 
parts of northern Texas into much of central Oklahoma on Monday and Tuesday. Heavy rain will spread 
into eastern Oklahoma on Tuesday and Wednesday as the system and associated warm front begin to 
lift toward the Middle Mississippi/Ohio Valleys. Rain and thunderstorms will spread into the 
aforementioned areas, as well as the Southeast and Mid-Atlantic from Wednesday to Friday along a 
stationary boundary draped along the Gulf coast. Upper-level ridging in the West will lead to Much 
Above Normal Temperatures across much of the Northwest between Memorial Day and Thursday. High 
temperatures are likely to be between 15-25 degrees above normal for most of the interior Pacific 
Northwest/California with some places potentially eclipsing 30 degree high temperature anomalies on 
Tuesday and Wednesday. High temperatures for this area will be in the 80s and 90s during this time. 

For Alaska, an area of low pressure will move into the Gulf of Alaska on Sunday. Moisture 
associated with the low will stream into the coastal regions producing rain from parts of the Kenai 
Peninsula eastward to near Valdez. On Monday, rain will fall on the Pacific side of Kodiak Island 
and the Alaska Peninsula Coast across from Kodiak Island. On Tuesday, the rainfall moves towards 
Yakutat. Models have trended downward with respect to precipitation forecasts along the Gulf coast 
which is why we've removed the heavy rain hazard areas for Alaska during this period.

Kebede