WWUS20 KWNS 211844

SEL9  

SPC WW 211844

DCZ000-DEZ000-MDZ000-NCZ000-VAZ000-WVZ000-CWZ000-220200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 509

NWS Storm Prediction Center Norman OK

245 PM EDT Tue Jul 21 2026



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of 

  District Of Columbia

  Delaware

  Maryland

  Far Northwest North Carolina

  Virginia

  The Eastern West Virginia Panhandle

  Coastal Waters



* Effective this Tuesday afternoon and evening from 245 PM until

  1000 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  Isolated large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...Multiple rounds of strong to severe thunderstorms are

expected across the region today and tonight, beginning with the

ongoing storms across central Virginia. Environmental conditions

support robust updrafts, with all severe hazards possible, including

damaging gusts and isolated hail. A low-probability tornado risk

exists with any afternoon development as well. Another round of

storms is possible along a cold front later tonight, with damaging

gusts as the primary risk. A low-probability, line-embedded tornado

risk exists with these more linear storms as well.



The severe thunderstorm watch area is approximately along and 105

statute miles east and west of a line from 30 miles north northeast

of Baltimore MD to 10 miles west of South Hill VA. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU9).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Severe Thunderstorm Watch means conditions are

favorable for 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. Severe thunderstorms can and occasionally do produce

tornadoes.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 506...WW 507...WW 508...



AVIATION...A few severe thunderstorms with hail surface and aloft to

1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

26030.



...Mosier