Severe Thunderstorm Watch 433

Issued

Aug 12, 2021, 3:48 PM EDT (19:48 UTC)

Expired

Aug 12, 2021, 10:00 PM EDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Pittsburgh radar (KPBZ), 87 km from the middle of the area, began a volume at 19:49 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

10%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

70%

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

90%

• Mesoscale Discussion 1498 Severe potential...watch possibleAug 12, 12:19 PM EDT
• Mesoscale Discussion 1499 Severe potential...severe thunderstorm watch likelyAug 12, 3:17 PM EDT
• Mesoscale Discussion 1503 Severe thunderstorm watch 431...433Aug 12, 6:22 PM EDT

558 
WWUS20 KWNS 121945
SEL3  
SPC WW 121945
OHZ000-PAZ000-WVZ000-LEZ000-130200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 433
NWS Storm Prediction Center Norman OK
345 PM EDT Thu Aug 12 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeastern Ohio
  Western Pennsylvania
  The northern West Virginia Panhandle
  Lake Erie

* Effective this Thursday afternoon and evening from 345 PM until
  1000 PM EDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph likely
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...Thunderstorms are beginning to form in northeastern Ohio, 
and storm coverage/intensity is expected to increase through the
remainder of the afternoon as storms move into western Pennsylvania.
 The storm environment favors clusters of storms with damaging winds
of 60-70 mph, and the strongest storms may also produce isolated
large hail near 1 inch diameter.

The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 20 miles south
southwest of Cleveland OH to 35 miles north northeast of Latrobe PA.
For a complete depiction of the watch see the associated watch
outline update (WOUS64 KWNS WOU3).

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 431...WW 432...

AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few
cumulonimbi with maximum tops to 550. Mean storm motion vector
28035.

...Thompson

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