US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
428 PM EDT Tue Jun 16 2020
 
Valid Friday June 19 2020 - Tuesday June 23 2020
 
Hazards:
- Heavy rain across portions of the Southern Plains, Mon, Jun 22.
- Heavy rain across portions of the Central Plains, Fri, Jun 19.
- Flooding possible across portions of the Northern Plains and the Northern Rockies.
- Flooding occurring or imminent across portions of the Southeast, the Middle/Lower Mississippi 
Valley, and the Northern Plains.
- Much above normal temperatures across portions of California, the Central Great Basin, the 
Pacific Northwest, 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, Fri-Sat, Jun 19-Jun 20.
- Much above normal temperatures across portions of the Northeast and the Great Lakes, Fri-Sun, Jun 
19-Jun 21.
 
Detailed Summary:

An upper-level ridging extending from the Southern Plains northeastward to the Upper Great Lakes 
will slowly weaken when upper-level troughing over the Northern Plains moves eastward to the Upper 
Great Lakes by Saturday and associated front will slowly move across the Upper Great Lakes on 
Saturday into Monday. The upper-level ridging will allow temperatures to become 12 degrees above 
normal on Friday. These conditions met the criteria for depicting and area of much above normal 
temperatures over the region on Friday ending on Saturday.

Meanwhile the upper-level ridge ahead of the aforementioned upper-level trough over the Northern 
Plains 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 Friday into Sunday. The building upper-level ridging 
will allow temperatures to become 12 degrees above normal over the Lower Great Lakes/Northeast on 
Friday into Sunday.  On Saturday the upper-level trough over the Northern Plains will begin to move 
into the Northeast and Lower Great Lakes. These conditions met the criteria for depicting and area 
of much above normal temperatures over the region on Friday 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 Plains, upper-level ridging will develops over the 
region starting on Sunday and building into Monday. On Tuesday, a weak upper-level trough will move 
over the Pacific Northwest reducing the effects of the upper-level ridging.  The ridging will aid 
in allowing temperatures to reach the criteria for an area of much above normal temperatures on 
Sunday into Monday.

A front associated with the upper-level troughing over the Northern Plains will extend from the 
Upper Great Lakes to the Southern High Plains and will move eastward to the Lower Great Lakes to 
the Southern Plains and stalling over the Central/Southern Plains into the Lower Great Lakes. A 
plume of Moisture will move northward from the Western Gulf of Mexico northward over the Southern 
Plains on Friday 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 Central 
Plains Friday.  The front will slowly move into Southern Plains on Monday producing another region 
of heavy rain over parts of Dallas, Texas.

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