Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 253, NWS Pittsburgh, PA

August 18, 2019Armstrong County, Clarion County, Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 18, 2019, 12:35 PM EDT for Armstrong County, Clarion County, Jefferson County, Pennsylvania. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 18, 2019, 12:35 PM EDT (16:35 UTC)
Expired
Aug 18, 2019, 1:02 PM EDT
In force
27 min
Issued by
NWS Pittsburgh, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Armstrong County, PA, Clarion County, PA, Jefferson County, PA

The radar

The Pittsburgh radar (KPBZ), 96 km from the middle of the area, began a volume at 16:36 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 12:00Z, 4.6 hours before the alert went out and 98 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2019-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 566 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2019-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
566 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
1315 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 18, 9:18 AM EDT, 3 hours 17 minutes earlier.

Area forecast discussion, Aug 18, 9:18 AM EDT, 3 hours 17 minutes before
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Hazardous weather outlook, Aug 18, 4:04 AM EDT, 8 hours 31 minutes before
Hazardous Weather Outlook
National Weather Service Pittsburgh PA
404 AM EDT Sun Aug 18 2019

MDZ001-OHZ059-068-069-PAZ031-074>076-WVZ004-012-021-509>514-190815-
Garrett-Belmont-Noble-Monroe-Greene-Westmoreland Ridges-Fayette-
Fayette Ridges-Marshall-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
404 AM EDT Sun Aug 18 2019

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

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

OHZ039>041-048>050-057-058-PAZ007>009-013>016-020>023-029-073-
WVZ001>003-190815-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Mercer-Venango-Forest-Lawrence-Butler-Clarion-
Jefferson PA-Beaver-Allegheny-Armstrong-Indiana-Washington-
Westmoreland-Hancock-Brooke-Ohio-
404 AM EDT Sun Aug 18 2019

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

.DAY ONE...Today and tonight.

Isolated severe storms are possible this afternoon and evening.
Damaging wind gusts or a moisture laden downburst is possible.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

In the hours before

Local storm report, Aug 18, 8:25 AM EDT, 4 hours 10 minutes before
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Local storm report, Aug 18, 8:28 AM EDT, 4 hours 7 minutes before
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Special weather statement, Aug 18, 8:34 AM EDT, 4 hours 1 minute before
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Local storm report, Aug 18, 8:46 AM EDT, 3 hours 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
846 AM EDT SUN AUG 18 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0441 PM     TSTM WND DMG     1 W GOLINZA             41.44N  79.35W
08/17/2019                   FOREST             PA   911 CALL CENTER

            MULTIPLE TREES DOWN IN SOUTHERN GREEN TOWNSHIP.

0445 PM     TSTM WND DMG     TYLERSBURG              41.38N  79.32W
08/17/2019                   CLARION            PA   911 CALL CENTER

            MULTIPLE TREES AND DOWNED POWER LINES IN TYLERSBURG.

0445 PM     TSTM WND DMG     1 ENE FRYBURG           41.35N  79.44W
08/17/2019                   CLARION            PA   911 CALL CENTER

            OLD FRYBURG ROAD CLOSED BRIEFLY DUE TO DOWNED POWER
            LINES AND TREES.

0450 PM     TSTM WND DMG     LICKINGVILLE            41.38N  79.36W
08/17/2019                   CLARION            PA   911 CALL CENTER

            SUNNY ROAD CLOSED BRIEFLY DUE TO DOWNED POWER LINES AND
            TREES.

0458 PM     TSTM WND DMG     LUCINDA                 41.31N  79.37W
08/17/2019                   CLARION            PA   911 CALL CENTER

            MULTIPLE DOWN TREES AND POWER LINES IN LUCINDA AND
            SNYDERSBURG.

&&

EVENT NUMBER PBZ1902863
EVENT NUMBER PBZ1902864
EVENT NUMBER PBZ1902865
EVENT NUMBER PBZ1902866
EVENT NUMBER PBZ1902867

JF
Local storm report, Aug 18, 9:06 AM EDT, 3 hours 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
906 AM EDT SUN AUG 18 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0522 PM     TSTM WND DMG     1 NNW HOWE              41.23N  79.11W
08/17/2019                   JEFFERSON          PA   911 CALL CENTER

            *** 1 INJ *** TREE FELL DOWN ON MOVING VEHICLE ON MOORE
            BRIDGE ROAD NEAR ROUTE 36. DRIVER INJURED BY SHATTERED
            GLASS FROM TREE HITTING CAR.

0540 PM     TSTM WND DMG     ROCKDALE                41.18N  78.84W
08/17/2019                   JEFFERSON          PA   911 CALL CENTER

            MULTIPLE TREES DOWN IN SNYDER AND WASHINGTOWN
            TOWNSHIPS.

&&

EVENT NUMBER PBZ1902868
EVENT NUMBER PBZ1902869

JF
Local storm report, Aug 18, 9:20 AM EDT, 3 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
920 AM EDT SUN AUG 18 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0522 PM     TSTM WND DMG     1 NNE BOYERS            41.12N  79.89W
08/17/2019                   BUTLER             PA   911 CALL CENTER

            MULTIPLE TREES AND POWER LINES DOWN AROUND BOYERS.

0530 PM     TSTM WND DMG     EAU CLAIRE              41.14N  79.80W
08/17/2019                   BUTLER             PA   911 CALL CENTER

            MULTIPLE TREES AND POWER LINES DOWN IN EAU CLAIRE.

&&

EVENT NUMBER PBZ1902870
EVENT NUMBER PBZ1902871

JF

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:34 AM EDTSpecial Weather StatementPBZVenango26 min
Aug 18, 1:05 PM EDTSpecial Weather StatementPBZJefferson40 min
Aug 18, 1:19 PM EDTSpecial Weather StatementPBZWashington41 min
Aug 18, 2:02 PM EDTSevere Thunderstorm WarningPBZAllegheny, Fayette, Washington, Westmoreland43 min
Aug 18, 2:08 PM EDTSpecial Weather StatementPBZClarion37 min
Aug 18, 2:13 PM EDTSevere Thunderstorm WarningPBZArmstrong, Clarion, Jefferson47 min
Aug 18, 2:17 PM EDTSevere Thunderstorm WarningPBZFayette, Westmoreland43 min
Aug 18, 2:21 PM EDTSevere Thunderstorm WarningPBZWashington39 min
Aug 18, 2:26 PM EDTSevere Thunderstorm WarningPBZWestmoreland49 min
Aug 18, 2:48 PM EDTSevere Thunderstorm WarningPBZIndiana, Jefferson28 min
Aug 18, 2:50 PM EDTSevere Thunderstorm WarningPBZIndiana, Westmoreland28 min
Aug 18, 2:52 PM EDTSpecial Weather StatementPBZFayette23 min
Aug 18, 3:00 PM EDTSevere Thunderstorm WarningPBZFayette, Greene45 min
Aug 18, 3:23 PM EDTSpecial Weather StatementPBZFayette37 min
Aug 18, 3:29 PM EDTSpecial Weather StatementPBZFayette31 min
Aug 18, 3:33 PM EDTSpecial Weather StatementPBZIndiana27 min
Aug 18, 3:35 PM EDTSevere Thunderstorm WarningPBZIndiana, Jefferson13 min
Aug 18, 3:38 PM EDTSevere Thunderstorm WarningPBZFayette, Washington, Westmoreland18 min
Aug 18, 4:21 PM EDTSpecial Weather StatementPBZAllegheny24 min
Aug 18, 4:58 PM EDTSpecial Weather StatementPBZMercer32 min
Aug 18, 5:26 PM EDTSpecial Weather StatementPBZClarion, Forest19 min
Aug 18, 5:30 PM EDTSevere Thunderstorm WarningPBZClarion, Forest, Jefferson, Venango45 min
Aug 18, 5:34 PM EDTSpecial Weather StatementPBZMercer26 min
Aug 18, 5:38 PM EDTSevere Thunderstorm WarningPBZMercer52 min
Aug 18, 5:47 PM EDTAreal Flood AdvisoryPBZMercer3 hr
Aug 18, 6:10 PM EDTFlash Flood WarningPBZMercer90 min
Aug 18, 6:11 PM EDTSevere Thunderstorm WarningPBZClarion, Forest, Jefferson34 min
Aug 18, 6:22 PM EDTSpecial Weather StatementPBZForest, Venango23 min
Aug 18, 7:06 PM EDTSpecial Weather StatementPBZForest24 min
Aug 18, 7:27 PM EDTSpecial Weather StatementPBZMercer33 min
Aug 18, 7:29 PM EDTSpecial Weather StatementPBZClarion31 min
Aug 18, 7:55 PM EDTSpecial Weather StatementPBZMercer35 min
Aug 18, 2:34 PM EDTSpecial Weather StatementPBZNoble26 min
Aug 18, 5:09 PM EDTSpecial Weather StatementPBZTucker21 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019Every severe thunderstorm warning in 2019

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.