US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
345 PM EDT Fri May 29 2020
 
Valid Monday June 01 2020 - Friday June 05 2020
 
Hazards:
- Heavy rain across portions of southern Florida, Thu-Fri, Jun 4-Jun 5.
- Flooding possible across portions of the Southeast, the Great Lakes, and the northern Great Basin.
- Flooding occurring or imminent across portions of the Great Plains, the Midwest, the northern 
Rockies, the Middle Mississippi Valley, and the Carolinas.
- Flooding likely across portions of the central Plains, South Carolina, the mid-Mississippi 
Valley, the northern Rockies, and the northern Great Basin.
- Much above normal temperatures from the central Great Basin, across portions of the northern and 
central Rockies into the northern and central Plains, Mon-Tue, Jun 1-Jun 2.
- Much above normal temperatures over the Seward Peninsula in western Alaska, Mon, Jun 1.
 
Detailed Summary:

An upper ridge slowly building eastward from the western U.S. into the Plains will spread well 
above normal temperatures from the northern and central Rockies eastward into the High Plains early 
next week, where high temperatures are forecast to soar well into the 90s through next Tuesday 
before cooler air arrives behind a cold front.  Meanwhile, much of the eastern U.S. will start out 
next week with cooler than normal temperatures.  But as the ridge of high pressure in the West 
builds eastward, increasingly warm and moist air will gradually filter toward the eastern U.S. next 
week.  By late next week, summer-like weather will likely spread into much of the East Coast except 
for New England where temperatures are forecast to be near or slightly below normal.  Somewhat 
drier air could spread farther south into the Mid-Atlantic behind a cold front by next Friday.  
Meanwhile, heat could begin to intensify across the northern and central High Plains next Friday.

Precipitation will generally be light across much of the mainland U.S. during the medium-range 
period.  However, parts of southern Florida could see an increasing threat of heavy rainfall toward 
the end of next week.  This is due to an influx of tropical moisture well ahead of a potential 
tropical low pressure system that could interact with a stationary front across southern Florida.  
There is considerable uncertainty regarding this potential tropical system.  The potential of heavy 
rain along the Gulf Coast, including Florida, will likely be subject to change.

Over Alaska, well-above normal temperatures are forecast for the western portion of the state near 
and around the Seward Peninsula under an upper high.  Meanwhile, a surface high over the Beaufort 
Sea will gradually filter cooler air across the North Slope toward central and western Alaska as 
the week progresses.  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, an occluded cyclone is forecast to track eastward from the Aleutians 
toward the Alaskan Panhandle.  It appears that coastal sections of southern and southeastern Alaska 
will see the highest chance of sustained precipitation early next week.  Rainfall amounts are 
generally forecast to remain below heavy rain criteria for mainland Alaska, but there is some 
potential for the rain to reach the 2-inch threshold over the Panhandle and the Kenai Peninsula.  
Farther inland, periods of terrain-influenced/enhanced precipitation are expected across southern 
Alaska, where snow can be expected for the higher elevations through much of next week.

Kong