US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
438 PM EDT Mon Apr 15 2019
 
Valid Thursday April 18 2019 - Monday April 22 2019
 
Hazards:
- Heavy rain across portions of the Middle/Lower Mississippi Valley, the Tennessee Valley, the 
Southern Appalachians, the Southeast, and the Ohio Valley, Thu-Fri, Apr 18-Apr 19.
- Heavy rain across portions of the Central Appalachians, the Mid-Atlantic, the Southern 
Appalachians, the Southeast, the Great Lakes, and the Ohio Valley, Fri-Sat, Apr 19-Apr 20.
- Severe weather across portions of the Middle/Lower Mississippi Valley, the Tennessee Valley, the 
Mid-Atlantic, the Southern Appalachians, the Southeast, the Great Lakes, and the Ohio Valley, Thu, 
Apr 18.
- Severe weather across portions of the Southeast, the Central/Southern Appalachians, and the 
Mid-Atlantic,  Fri, Apr 19.
- Flooding possible across portions of the Northern/Central Plains, the Northeast, the Northern 
Great Basin, the Mid-Atlantic, the Upper Mississippi Valley, the Southeast, and the Great Lakes.
- Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Northern 
Plains, the Upper/Middle Mississippi Valley, the Southern Plains, and the Ohio Valley.
- Flooding likely across portions of the Upper Mississippi Valley and the Northern Plains.
- High winds across portions of the Central Plains and the Southern Plains, Sun-Mon, Apr 21-Apr 22.
- Heavy rain across portions of the Alaska Panhandle, Thu-Fri, Apr 18-Apr 19.
 
Detailed Summary:

A strong storm over the Middle Mississippi Valley with an associated front extending from parts of 
the Great Lakes across the Middle Mississippi Valley southwestward to the Western Gulf Coast will 
move eastward to the Lower Great Lakes/Ohio Valley southward to the Eastern Gulf Coast by Friday 
then move off the East Coast by Saturday.  Moisture will pool along the front and the upper-level 
pattern will allow for unstable air mass that will in turn will produce produce severe 
thunderstorms and heavy rain over parts of the Western Ohio Valley southward to the Tennessee/Lower 
Mississippi Valleys into parts of the Southeast on Thursday.  As the boundary moves eastward, the 
moisture, upper-level pattern, and unstable air mass will aid in producing severe thunderstorms and 
heavy rain over parts of the Mid-Atlantic and the Southeast on Friday.  

The strength of the pressure gradient associated with another area of low pressure over the Central 
High Plains on Sunday and over the Central Plains into the Middle Mississippi Valley on Monday will 
aid in producing an area of high wind of 34 mph and gust of 58 mph over parts of the Central Plains 
on Sunday into Monday.   Furthermore, moderate to heavy rainfall is expected across much of Upper 
Mississippi Valley and parts of the Upper Great Lakes from Wednesday morning through Friday 
afternoon. Most locations could see rainfall totals of 1 to 2 inches from Wednesday morning through 
early Friday morning with locally higher totals possible. Temperatures are expected to remain well 
above freezing for the middle and end of the work week, which will lead to increased runoff from 
snow melt.  The combination of runoff from moderate to heavy rainfall along with more rapid snow 
melt runoff, will lead to increased river flooding potential as well as areal flooding potential.  
The combination of runoff from moderate to heavy rainfall along with more rapid snow melt runoff, 
will lead to increased river flooding potential as well as areal flooding potential.  In addition, 
water flowing down stream in the Mississippi Valley will aid in producing flooding over parts of 
the Lower Mississippi Valley.       

Over Alaska, low pressure over the Gulf of Alaska will aid in streaming moisture into the Alaska 
Panhandle that will aid in producing heavy rainfall over the panhandle on Thursday into Friday.  


Ziegenfelder