Tornado Watch Number 686
NWS Storm Prediction Center Norman OK
255 PM EDT Thu Oct 31 2019
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
District Of Columbia
Maryland
Pennsylvania
Northern Virginia
Eastern West Virginia Panhandle
Coastal Waters
* Effective this Thursday afternoon from 255 PM until Midnight
EDT.
* Primary threats include...
A few tornadoes likely with a couple intense tornadoes possible
Widespread damaging winds likely with isolated significant gusts
to 75 mph possible
SUMMARY...Fast-moving squall line over West Virginia should
intensify and elongate as it pushes to the east of the Appalachians.
The risk for damaging winds and embedded tornadoes will increase
through early to mid evening, before waning later tonight.
The tornado watch area is approximately along and 90 statute miles
east and west of a line from 60 miles west southwest of Washington
DC to 30 miles north of State College PA. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU6).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 685...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0.5 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 400. Mean
storm motion vector 22045.
...Grams
======================================================================
591
WWUS40 KWNS 311854
WWP6
TORNADO WATCH PROBABILITIES FOR WT 0686
NWS STORM PREDICTION CENTER NORMAN OK
0152 PM CDT THU OCT 31 2019
WT 0686
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : 60%
PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 30%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 90%
PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS : 40%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : <05%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : <05%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : >95%
&&
ATTRIBUTE TABLE:
MAX HAIL /INCHES/ : 0.5
MAX WIND GUSTS SURFACE /KNOTS/ : 65
MAX TOPS /X 100 FEET/ : 400
MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 22045
PARTICULARLY DANGEROUS SITUATION : NO
&&
FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND
WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU6.
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