U.S. Severe Weather Forecast (Convective Outlook)

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acus02 kwns 211723 
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Storm Prediction Center ac 211722 


Day 2 convective outlook 
National Weather Service Storm Prediction Center Norman OK 
1122 am CST Tue Feb 21 2017 


Valid 221200z - 231200z 


..no severe thunderstorm areas forecast... 


... 
severe weather is not expected across the contiguous United States 
on Wednesday. 


... 
A belt of enhanced west/southwesterly mid-level flow will stretch 
from southern/central California to the upper Midwest during the 
day, as a trough continues to overspread the Pacific northwest. 
Farther east, another impulse will translate eastward from the 
northern plains to the upper Great Lakes. Across the southeastern 
US, a weakening mid/upper low will cross the Florida Peninsula late 
in the period. The surface response will feature a cold front 
gradually progressing southward over portions of the southern Great 
Basin, while another front pushes southeastward across the northern 
plains and upper Midwest. 


..Florida Peninsula... 
Despite the weakening nature of the mid/upper low, cooling aloft and 
increasing low-level moisture will support enough buoyancy for 
scattered thunderstorms across the peninsula during the day. 
Relatively weak low-level flow and marginal buoyancy are expected to 
preclude a threat of severe thunderstorms. 


..Pacific northwest... 
Cold mid-level temperatures (around -34 to -38 c) will come ashore 
the coast during the period. Despite cool surface conditions and low 
dew points, steep low/mid-level lapse rates should encourage the 
development of isolated thunderstorms during the afternoon. 


.Picca/Broyles.. 02/21/2017 


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