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ACUS48 KWNS 270804
SWOD48
SPC AC 270803

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0303 AM CDT Sat Jul 27 2019

Valid 301200Z - 041200Z

...DISCUSSION...
A strong upper high pressure system will remain entrenched over the
western U.S. while a trough persists over the eastern states during
the Day 4-8 period. Medium range guidance shows several shortwave
impulses migrating through the upper ridge from the central Rockies
vicinity into the northern/central Plains and continuing toward the
mid-MS Valley in deep layer northwesterly flow. Strong surface high
pressure is likely to persist much of the period over the upper
Great Lakes, maintaining a drier airmass over that region. However,
southeasterly low level flow will persist from the Gulf of Mexico
northwestward across the Plains, bringing ample moisture north
across the Plains. Depending on the timing and intensity of
shortwave impulses topping the ridge and migrating southeast through
northwesterly flow, some severe potential could exist across the
mid-section of the CONUS. However, details of these smaller scale
perturbations are too uncertain to highlight areas at this time.

..Leitman.. 07/27/2019


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