SPC MD 1586

MD 1586 CONCERNING TORNADO WATCH 452... FOR MUCH OF LOUISIANA...FAR EASTERN TEXAS AND SOUTHWEST MISSISSIPPI

Mesoscale Discussion 1586
NWS Storm Prediction Center Norman OK
0747 PM CDT Wed Aug 26 2020

Areas affected...much of Louisiana...far eastern Texas and southwest
Mississippi

Concerning...Tornado Watch 452...

Valid 270047Z - 270245Z

The severe weather threat for Tornado Watch 452 continues.

SUMMARY...Shear will continue to increase with the approach of
Hurricane Laura, with sporadic tornadoes possible within developing
bands of storms through tonight. The greatest tornado risk will
exist within the northeastern quadrant of the storm, primarily over
Louisiana. As such, a new tornado watch will be needed.

DISCUSSION...Objective analysis shows gradually increasing low-level
shear over the area, with 0-1 SRH of 300-400 m2/s2 across southwest
Louisiana early this evening. Shear will increase overnight as
Hurricane Laura continues northward toward coastal Louisiana and
Texas. Low-level moisture quality will also increase near and east
of the center track, with dewpoints at or above 77 F. This should
result in favorable SBCAPE for supercells embedded within the rain
bands, with 0-1 SRH over 500 m2/s2 aiding tornado potential.

..Jewell.. 08/27/2020

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...JAN...LIX...LCH...SHV...HGX...

LAT...LON   29419344 29549419 29929446 30899443 31719432 32069404
            32189368 32239336 32149282 31959231 30629110 30089079
            29529069 29089084 28979111 28999167 29419344 

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