Tornado Watch 401

Issued

Jul 29, 2021, 2:23 PM EDT (18:23 UTC)

Expired

Jul 29, 2021, 10:00 PM EDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Sterling radar (KLWX), 157 km from the middle of the area, began a volume at 18:24 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1388 Severe potential...watch possibleJul 29, 1:21 PM EDT
• Mesoscale Discussion 1391 Tornado watch 401Jul 29, 4:26 PM EDT
• Mesoscale Discussion 1394 Tornado watch 401Jul 29, 7:09 PM EDT

970 
WWUS20 KWNS 291821
SEL1  
SPC WW 291821
DEZ000-MDZ000-NJZ000-PAZ000-CWZ000-300100-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 401
NWS Storm Prediction Center Norman OK
225 PM EDT Thu Jul 29 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Delaware
  Central and Eastern Maryland
  Much of New Jersey
  Central and Southeast Pennsylvania
  Coastal Waters

* Effective this Thursday afternoon and evening from 225 PM until
  900 PM EDT.

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

SUMMARY...Thunderstorms over central Pennsylvania will intensify as
they move eastward, while isolated storms form out ahead of the main
activity.  A few supercells and bowing lines are expected, capable
of damaging winds, hail, and perhaps a few tornadoes.

The tornado watch area is approximately along and 55 statute miles
north and south of a line from 40 miles south southwest of State
College PA to 40 miles east of Atlantic City NJ. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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.

&&

AVIATION...Tornadoes and 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 27035.

...Hart

Tornado Watches in Pennsylvania, 2021Tornado Watches in New Jersey, 2021Tornado Watches in Maryland, 2021Every tornado 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.