Severe Storm Outlook Narrative (AC)
Issued by NWS

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
ACUS11 KWNS 220135
SPC MCD 220134

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 for graphic product...


LAT...LON   36859623 36869474 36329405 34639456 33379630 32759821
            32719960 33099978 33939892 36859623 is the U.S. government's official web portal to all federal, state and local government web resources and services.