Severe Thunderstorm Watch 385

Issued

Jul 21, 2021, 11:56 AM EDT (15:56 UTC)

Expired

Jul 21, 2021, 6:55 PM EDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 15:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

5%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1323 Severe potential...watch likelyJul 21, 10:32 AM EDT
• Mesoscale Discussion 1324 Severe thunderstorm watch 385Jul 21, 2:39 PM EDT

267 
WWUS20 KWNS 211554
SEL5  
SPC WW 211554
CTZ000-DCZ000-DEZ000-MAZ000-MDZ000-NJZ000-NYZ000-PAZ000-RIZ000-VAZ00
0-CWZ000-220000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 385
NWS Storm Prediction Center Norman OK
1155 AM EDT Wed Jul 21 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Connecticut
  District Of Columbia
  Delaware
  Southeast Massachusetts
  Central and Eastern Maryland
  New Jersey
  Southeast New York
  Southeast Pennsylvania
  Rhode Island
  Northeast Virginia
  Coastal Waters

* Effective this Wednesday morning and evening from 1155 AM until
  800 PM EDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph likely
  Scattered large hail events to 1.5 inches in diameter possible

SUMMARY...Scattered strong to severe thunderstorms will develop this
afternoon along a weak cold front extending from northern Virginia
into eastern Massachusetts.  The strongest cells will pose a risk of
damaging wind gusts and hail.

The severe thunderstorm watch area is approximately along and 50
statute miles either side of a line from 25 miles west southwest of
Baltimore MD to 40 miles northeast of Hyannis MA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).

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.

&&

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
28030.

...Hart

Severe Thunderstorm Watches in Maryland, 2021Severe Thunderstorm Watches in New Jersey, 2021Severe Thunderstorm Watches in Pennsylvania, 2021Every severe thunderstorm watch in 2021

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; radar from the NEXRAD Level II archive.