U.S. Severe Weather Forecast (Convective Outlook)

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Storm Prediction Center ac 181630 


Day 1 convective outlook 
National Weather Service Storm Prediction Center Norman OK 
1130 am CDT Mon Mar 18 2019 


Valid 181630z - 191200z 


..no severe thunderstorm areas forecast... 


... 
severe thunderstorms are not expected through early Tuesday. 


..southern rockies/Four Corners region... 
Minimal buoyancy combined with orographic ascent could yield a 
couple thunderstorms from the southern Rocky Mountains to the 
Mogollon Rim of northern Arizona, mainly in the late afternoon to 
early evening time frame. 


.Guyer/Goss.. 03/18/2019 


$$ 

Mesoscale Discussion


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sels mesoscale discussion 
Storm Prediction Center mesoscale discussion 152340 
ctz000-nyz000-njz000-paz000-dez000-mdz000-160145- 


Mesoscale discussion 0222 
National Weather Service Storm Prediction Center Norman OK 
0640 PM CDT Fri Mar 15 2019 


Areas affected...parts of central Maryland....southeastern 
Pennsylvania...northern New Jersey...southeastern New York 


Concerning...severe potential...watch unlikely 


Valid 152340z - 160145z 


Probability of watch issuance...5 percent 


Summary...a narrow line of storms may be accompanied by some risk 
for potentially damaging wind gusts through about 8-9 PM EDT across 
the northern mid Atlantic coast region, mainly west and northwest of 
the greater Philadelphia and New York City metropolitan areas. 


Discussion...an evolving narrow line of generally low-topped 
thunderstorm activity appears to have formed within Lee surface 
troughing, in response to an area of enhanced mid/upper forcing for 
ascent and and lower/mid tropospheric cooling spreading to the east 
of the Allegheny Mountains. The latest rapid refresh suggests that 
a secondary surface low may be in the process of forming across the 
northern mid Atlantic coast region into southern New England by this 
evening. 


Peak boundary layer cape appears limited to around 500 j/kg or so, 
and should begin waning with the onset of radiational surface 
cooling during the next couple of hours. So current vigorous 
convective intensities are not anticipated to be particularly 
long-lived. However, strongly sheared, 40-50 kt mean southwesterly 
flow in the convective layer could still support some increase in 
potential for damaging convective gusts through 00-01z, before 
storms begin to weaken. 


.Kerr/Hart.. 03/15/2019 


..please see www.Spc.NOAA.Gov for graphic product... 


Attention...WFO...okx...aly...phi...ctp...lwx... 


Latitude...Lon 40457579 41477391 41337356 40917368 40207481 39467617 
39347667 39497699 39707688 40457579