Alert archive / Pennsylvania / Flash Flood Warnings in 2022

Flash Flood Warning 10, NWS Pittsburgh, PA

July 17, 2022Allegheny County, Beaver County, Washington County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Jul 17, 2022, 5:30 AM EDT for Allegheny County, Beaver County, Washington County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 17, 2022, 5:30 AM EDT (09:30 UTC)
Expired: Jul 17, 2022, 8:03 AM EDT
In force: 3 hr
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Flood severity: None

Counties Allegheny County, PA, Beaver County, PA, Washington County, PA

The radar

The Pittsburgh radar (KPBZ), 10 km from the middle of the area, began a volume at 09:33 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.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 9.5 hours before the alert went out and 9 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 232 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 757 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this flash flood warning went out at Jul 17, 5:05 AM EDT, 25 minutes earlier.

Area forecast discussion, Jul 17, 5:05 AM EDT, 25 minutes before

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Hazardous weather outlook, Jul 17, 3:38 AM EDT, 1 hour 52 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
338 AM EDT Sun Jul 17 2022

PAZ007>009-015-016-180745-
Mercer-Venango-Forest-Clarion-Jefferson PA-
338 AM EDT Sun Jul 17 2022

This Hazardous Weather Outlook is for northwest Pennsylvania and
western Pennsylvania.

.DAY ONE...Today and tonight.

Storms late this afternoon and evening, could produce heavy downpours
which may lead to localized flooding.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

OHZ039>041-048>050-057>059-068-069-PAZ013-014-020>023-029-031-
073>076-WVZ001>004-012-021-509>514-180745-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Belmont-Noble-Monroe-Lawrence-Butler-Beaver-
Allegheny-Armstrong-Indiana-Washington-Greene-Westmoreland-
Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel-
Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
338 AM EDT Sun Jul 17 2022

This Hazardous Weather Outlook is for east central Ohio, southwest
Pennsylvania, western Pennsylvania, and northern West Virginia.

.DAY ONE...Today and tonight.

Isolated severe storms are possible this afternoon and evening. The
main threat is damaging wind gusts. Storms can also produce heavy
downpours which may lead to localized flooding.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jul 17, 4:10 AM EDT, 1 hour 20 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
410 AM EDT Sun Jul 17 2022

PAZ029-170845-
Washington PA-
410 AM EDT Sun Jul 17 2022

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN WASHINGTON COUNTY
THROUGH 445 AM EDT...

At 410 AM EDT, Doppler radar was tracking a strong thunderstorm near
Weirton, moving east at 5 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Burgettstown, Atlasburg, Langeloth, Midway, and Slovan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4032 8030 4029 8051 4036 8052 4045 8051
      4045 8034 4037 8025
TIME...MOT...LOC 0810Z 272DEG 5KT 4040 8046

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Brown

Local storm report, Jul 17, 4:38 AM EDT, 52 minutes before

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Special weather statement, Jul 17, 5:27 AM EDT, 3 minutes before

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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 5:27 AM EDT	Special Weather Statement	PBZ	Beaver	33 min
Jul 17, 6:00 AM EDT	Areal Flood Advisory	PBZ	Allegheny, Beaver, Butler	2 hr
Jul 17, 6:22 AM EDT	Special Weather Statement	PBZ	Washington	23 min
Jul 17, 9:58 AM EDT	Flood Watch	PBZ	Allegheny, Beaver, Greene, Washington	22 hr
Jul 17, 3:45 PM EDT	Special Weather Statement	PBZ	Indiana, Westmoreland	60 min
Jul 17, 3:49 PM EDT	Special Weather Statement	PBZ	Fayette	41 min
Jul 17, 3:31 AM EDT	Flash Flood Warning	PBZ	Jefferson	2 hr
Jul 17, 4:10 AM EDT	Special Weather Statement	PBZ	Brooke	35 min

Nearby

Flash Flood Warnings in Pennsylvania, 2022 Every flash flood warning in 2022

Sources

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.