Severe Thunderstorm Watch 299

Issued

Jun 21, 2021, 12:31 PM EDT (16:31 UTC)

Expired

Jun 21, 2021, 8:00 PM EDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The State College radar (KCCX), 120 km from the middle of the area, began a volume at 16:31 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

20%

One or more EF2 to EF5 tornadoes

5%

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

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1045 Severe potential...watch likelyJun 21, 11:59 AM EDT
• Mesoscale Discussion 1046 Severe potential...watch likelyJun 21, 12:31 PM EDT
• Mesoscale Discussion 1047 Severe potential...watch possibleJun 21, 12:35 PM EDT
• Mesoscale Discussion 1048 Severe potential...severe thunderstorm watch likelyJun 21, 1:51 PM EDT
• Mesoscale Discussion 1050 Severe thunderstorm watch 299Jun 21, 3:47 PM EDT
• Mesoscale Discussion 1056 Severe thunderstorm watch 300...303Jun 21, 6:50 PM EDT

229 
WWUS20 KWNS 211628
SEL9  
SPC WW 211628
KYZ000-NYZ000-OHZ000-PAZ000-VAZ000-WVZ000-LEZ000-LOZ000-220000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 299
NWS Storm Prediction Center Norman OK
1230 PM EDT Mon Jun 21 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Eastern Kentucky
  Western New York
  Eastern Ohio
  Western Pennsylvania
  Southwest Virginia
  Much of West Virginia
  Lake Erie
  Lake Ontario

* Effective this Monday afternoon and evening from 1230 PM until
  800 PM EDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph likely
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  A tornado or two possible

SUMMARY...Thunderstorms will become more numerous through the
afternoon across the watch area, with the potential for scattered
severe storms.  Damaging winds appear to be the main threat, but
hail and an isolated tornado are also possible.

The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 50 miles north of
Rochester NY to 25 miles southeast of Huntington WV. 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.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
26035.

...Hart

Severe Thunderstorm Watches in West Virginia, 2021Severe Thunderstorm Watches in Ohio, 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.