Severe Storm Outlook Narrative (AC)
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601
ACUS11 KWNS 220135
SWOMCD
SPC MCD 220134
ARZ000-MOZ000-OKZ000-TXZ000-220300-

Mesoscale Discussion 1729
NWS Storm Prediction Center Norman OK
0834 PM CDT Sat Oct 21 2017

Areas affected...Central/eastern OK and north TX

Concerning...Tornado Watch 503...504...

Valid 220134Z - 220300Z

The severe weather threat for Tornado Watch 503, 504 continues.

SUMMARY...Primary hazard should be strong to severe wind gusts with
an accelerating line of storms moving east, but a couple brief
tornadoes will remain possible within embedded mesovortices.

DISCUSSION...An extensive QLCS extends from southeast MN into
northwest TX. Strong to severe wind gusts of 45-60 mph have been
common per OK Mesonet sites. This should remain the primary hazard
as the line progresses east in tandem with a convectively reinforced
cold front, likely reaching the Tulsa metro area around 10 pm. With
surface dew points in the middle 60s and 0-1 km SRH around 300 m2/s2
per TLX/INX VWP data, transient mesovortices will pose a risk for a
couple brief tornadoes along the line. The progressive, surging
nature of the composite outflow/front should mitigate a greater
tornado threat.

..Grams.. 10/22/2017

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

ATTN...WFO...SGF...SHV...TSA...FWD...OUN...SJT...

LAT...LON   36859623 36869474 36329405 34639456 33379630 32759821
            32719960 33099978 33939892 36859623




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