Severe Storm Outlook Narrative (AC)
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ACUS48 KWNS 240654
SPC AC 240653

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0153 AM CDT Tue Apr 24 2018

Valid 271200Z - 021200Z

Model consensus is that a synoptic upper trough will dominate the
eastern U.S. through day 5 (Saturday) before moving off the eastern
seaboard Sunday (day 6). Moisture return inland will remain limited
into day 6 with a large area of continental-polar high pressure
moving through the eastern states maintaining offshore flow and dry
trajectories over the Gulf. Richer low-level moisture will begin
advecting farther into the Plains by day 7 as the Gulf boundary
layer recovers and winds return to southerly in wake of the area of
surface high pressure. However, spread in the 500 mb pattern among
ensemble members increases substantially beyond day 6 suggesting low

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