US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
338 PM EDT Mon Jun 15 2020
 
Valid Thursday June 18 2020 - Monday June 22 2020
 
Hazards:
- Heavy rain across portions of the Central Plains, the Middle Mississippi Valley, the Lower 
Mississippi Valley, and the Southern Plains, Mon, Jun 22.
- Flooding possible across portions of the Northern Plains and the Northern Rockies.
- Flooding occurring or imminent across portions of the Southeast, the Mississippi Valley, and the 
Northern Plains.
- Much above normal temperatures across portions of California, the Central Great Basin, the 
Pacific Northwest, the Northern Rockies, and the Northern Great Basin, Sun-Mon, Jun 21-Jun 22.
- Much above normal temperatures across portions of the Great Lakes and the Upper Mississippi 
Valley, Thu-Fri, Jun 18-Jun 19.
- Much above normal temperatures across portions of the Northeast and the Great Lakes, Thu-Sun, Jun 
18-Jun 21.
 
Detailed Summary:

An upper-level ridge extending from the Southern Plains northeastward to the Upper Great Lakes will 
remain in place from Thursday into Friday when upper-level troughing over the Northern High Plains 
moves eastward to the Upper Great Lakes by Friday and a front will set up over the Upper Great 
Lakes by Saturday.  The upper-level ridging will allow temperatures to become 12 degrees above 
normal, that will building into the Great Lakes on Thursday. These conditions met the criteria for 
depicting and area of much above normal temperatures over the region.

Meanwhile the upper-level ridge will build into the Lower Great Lakes and into parts of the 
Northeast as an upper-level low over the Mid-Atlantic will slowly weaken on Thursday into Sunday.  
The building upper-level ridging will allow temperatures to become 12 degrees above normal, that 
will building into the Lower Great Lakes/Northeast on Thursday. The upper-level trough over the 
Southern Plains will begin to move into the Northeast and Lower Great Lakes on Sunday.  These 
conditions met the criteria for depicting and area of much above normal temperatures over the 
region on Thursday into Sunday.

A third area of much above normal temperature will develop over parts of the Pacific Northwest, 
Great Basin, the Northern Intermountain Region, and parts of Northern California.  As the 
upper-level trough moves away from the Northern High Plains, upper-level ridging will develops over 
the region starting on Saturday and building into Monday.  The criteria for an area of much above 
normal temperatures will be met on Sunday into Monday.

A front associated with the upper-level troughing over the Northern High Plains will move eastward 
from the the Plains stalling over the Central/Southern Plains into the Middle Mississippi Valley 
into the Great Lakes where the boundary will become east-west orientated on Monday.  A plume of 
Moisture will move northward from the Western Gulf of Mexico northward over the Southern Plains on 
Sunday that will overrun the front.  Showers and thunderstorms will develop along the front that 
will produce enough rain to met the criteria for heavy rain over parts of the Southern Plains into 
parts of the Middle Mississippi Valley on Monday.     

No hazards are delineated over Alaska.  There will be rain over the Alaska Panhandle yet the rain 
will not meet the criteria for heavy rain over the area.  

Ziegenfelder