US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
356 PM EDT Mon Jun 07 2021
 
Valid Thursday June 10 2021 - Monday June 14 2021
 
Hazards:
- Heavy rain across portions of the Central/Southern Appalachians, the Mid-Atlantic, and the Ohio 
Valley, Thu-Fri, Jun 10-Jun 11.
- Severe weather across portions of the Central Plains and the Northern Plains, Thu, Jun 10.
- Flooding possible across portions of the Southern Plains.
- Flooding occurring or imminent across portions of the Southern Plains and the Northern Rockies.
- Much above normal temperatures across portions of the Great Basin, the Northern/Central Plains, 
and the Northern/Central Rockies,  Sat-Mon, Jun 12-Jun 14.
- Much above normal temperatures across portions of the Central Plains, the Central Rockies, the 
Northern Plains, the Great Lakes, the Southern Rockies, the Middle Mississippi Valley, the Upper 
Mississippi Valley, and the Southern Plains, Thu, Jun 10.
 
Detailed Summary:

A front extending from the Mid-Atlantic to the Upper Great Lakes will slowly move southward to the 
Southeast by Sunday.  The boundary will have pair of waves of low pressure transiting along the 
front.  The lows will cross the Mid-Atlantic, producing rain. The rain will be heavy enough for an 
area of Heavy Rain on the Hazards Chart for Thursday and Friday.  Along the western end of the 
front over the Northern Plains, the front will produce showers and thunderstorms.  The SPC has 
marked this area over the Northern High/Northern Plains into parts of the Central Plains as a 
location that severe thunderstorms will develop on Thursday. 

Meanwhile, upper-level ridging will develop over the Plains on Thursday.  The upper-level ridging 
will allow temperatures to climb into the upper 90s over the Northern High /Northern Plains into 
parts of the Central Plains. The Temperatures in the Southern High Plains will be in the 100s.  
Temperatures will also be hot over parts of the Upper Mississippi Valley and Upper Great Lakes, 
with temperatures in the 90s and upper 80s, on Thursday, too.  An area of Much Above Normal 
Temperatures was drawn over parts of the Plains and the Upper Midwest for Thursday. Showers and 
thunderstorms will cool the area off for Friday.  

On Saturday, the upper-level ridge returns over the Plains into the Rockies/Pacific Northwest, with 
much above-normal temperatures over parts of the Central High Plains into the Central Rockies.  The 
above-normal temperatures will expand as far west as parts of the Northern Intermountain Region and 
into parts of the Northern Plains on Sunday.  The above-normal temperatures will continue into 
Monday over the region.  For simplicity and ease of reading, only one Much Above Normal 
Temperatures area was drawn on the Hazards Chart for Saturday into Monday.

Furthermore, a tight pressure gradient offshore from Southern California will produce strong wind 
offshore from Thursday into Saturday.  The wind speed will not meet the criteria for an area of 
high wind.  However, boaters are encouraged to check with the local forecast office for any marine 
advisories.

For Alaska, an area of low pressure over the Gulf of Alaska on Thursday will move southeastward 
toward the Pacific Northwest by Monday.  The low will produce rain over parts of the Gulf of Alaska 
Coast on Thursday.  There is also a boundary over parts of the Southwestern Mainland producing rain 
on Thursday, too. An area of low pressure will move into parts of the Far North near Nome on 
Saturday.  The system will produce rain over the northern half of the state from Saturday into 
early Sunday morning.  A third low will move over the Aleutians on Saturday.   The low will produce 
rain over most of the area through Monday.  Rain will also develop over parts of the Southwestern 
Mainland on Sunday into Monday.  None of these areas of precipitation will meet the criteria for 
heavy rain across the state at this time.

Ziegenfelder