US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
408 PM EDT Tue May 21 2019
 
Valid Friday May 24 2019 - Tuesday May 28 2019
 
Hazards:
- Heavy rain across portions of the Central Plains, the Upper/Middle Mississippi Valley, the Great 
Lakes, and the Ohio Valley,  Fri-Tue, May 24-May 28.
- Severe weather across portions of the Central Plains, the Great Lakes, the Upper/Middle 
Mississippi Valley, and the Southern Plains, Fri, May 24.
- Severe weather across portions of the Great Lakes, the Mid-Atlantic, the Northeast, the Central 
Appalachians, and the Ohio Valley, Sat, May 25.
- Flooding possible across portions of the Northern/Central Plains, and the Upper/Middle 
Mississippi Valley.
- Flooding occurring or imminent across portions of the Plains, the Mississippi Valley, the Great 
Lakes, the Northern Rockies, and the Ohio Valley.
- Flooding likely across portions of the Northern/Central Plains, and the Upper/Middle Mississippi 
Valley.
- Excessive heat across portions of the Southern Plains, Sun-Tue, May 26-May 28.
- Excessive heat across portions of the Southeast, the Mid-Atlantic, the Lower Mississippi Valley, 
the Southern Appalachians, and the Tennessee Valley, Sat-Tue, May 25-May 28.
- Heavy precipitation across portions of the Alaska Panhandle and mainland Alaska, Fri-Mon, May 
24-May 27.
 
Detailed Summary:

A front extending from the Northern/Central Plains and Southern High Plains will move eastward to 
the Northeast by Sunday while becoming quasi-stationary from the Ohio Valley to the Central High 
Plains.  Moisture from the Gulf of Mexico will pool along the boundary and lift associated with the 
front will aid in making the air mass unstable producing severe thunderstorms along and ahead of 
the boundary over parts of the Central/Southern Plains,Upper/Middle Mississippi Valley, and the 
Upper Great Lakes on Friday.  The severe thunderstorms will move to the Lower Great Lakes/Ohio 
Valley, and to parts of the Central/Northern Appalachians on Saturday.  

Similarly, the moisture pooling a long the front and upper-level dynamics will aid in producing an 
area of heavy rain over parts of the Central Plains/Middle Mississippi Valley on Friday through 
Sunday.  As the front becomes quasi-stationary and more east-west oriented the heavy rain will 
develop over parts of the Central Plains eastward to the Upper Great Lakes/Western Ohio Valley late 
Sunday into Tuesday.

Upper-level ridging over the Southern Plains eastward to parts of the Southern 
Mid-Atlantic/Southeast and with maximum temperature anomalies in a range from +10 to +15 degree 
range will aid in producing an area of excessive heat over parts of the Southern 
Mid-Atlantic/Southeast into the Eastern Gulf Coast/Tennessee Valley Saturday into Tuesday.  There 
will also be an area of excessive heat over parts of the Lower Rio Grande Valley from Sunday into 
Tuesday.  For simplicity purposes, the hazards outlook area for excessive heat focuses across the 
Southeast where these types of temperatures would be the highest experienced thus far this year.    
 

Low pressure near the Aleutians, on Friday, will move into the Bering Sea by Sunday.  The 
associated front will move along the Southern Mainland Alaska Coast to near Yakutat by Monday as 
another area of low pressure moves near the Aleutians by Tuesday.  A plume of moisture extending 
from near Hawaii into parts of the Aleutians, on Friday, will also move eastward along the Mainland 
Alaska Coast to near Yakutat by Monday then dissipating.  An area of heavy precipitation will 
develop over the area on Friday from the South Mainland Alaska Coast that will slowly move eastward 
to near Yakutat by Monday.  

Ziegenfelder