Mesoscale Discussion 149

Issued

Feb 7, 2017, 12:56 PM CST (18:56 UTC)

Expired

Feb 7, 2017, 2:00 PM CST

In force

64 min

Issued by

the Storm Prediction Center

954 
ACUS11 KWNS 071857
SWOMCD
SPC MCD 071856 
MSZ000-LAZ000-072000-

Mesoscale Discussion 0149
NWS Storm Prediction Center Norman OK
1256 PM CST Tue Feb 07 2017

Areas affected...southeast Louisiana through southern Mississippi

Concerning...Tornado Watch 26...

Valid 071856Z - 072000Z

The severe weather threat for Tornado Watch 26 continues.

SUMMARY...Tornado watch 26 is scheduled to expire at 20Z. However,
storms will probably not have cleared the southeast portion of the
WW by that time. A local 2 hour extension in time may be necessary
for that portion of the WW to cover remaining threat.

DISCUSSION...Several discrete supercells persist over southeast LA
into the MS bootheel and are moving east at around 30 kt. While the
atmosphere upstream remains quite unstable, winds are veering and
subsidence drying aloft in wake of shortwave trough will likely
limit additional development west of ongoing storms. This suggests
the primary tornado threat should remain confined to a small area
across southeast LA into southeast MS next few hours before storms
move into WW 27. Farther north across south central to central MS
where the boundary layer is less unstable, primary threat appears to
be damaging wind and large hail, but a tornado or two cannot be
ruled out.

..Dial.. 02/07/2017

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

ATTN...WFO...MOB...JAN...LIX...

LAT...LON   32358856 30488849 29508989 29549041 30999062 32548964
            32358856

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The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.