Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 271, NWS Pittsburgh, PA

August 20, 2019Beaver County, Lawrence County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 20, 2019, 5:33 PM EDT for Beaver County, Lawrence County, Pennsylvania. It was in force for 26 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 20, 2019, 5:33 PM EDT (21:33 UTC)
Expired
Aug 20, 2019, 5:59 PM EDT
In force
26 min
Issued by
NWS Pittsburgh, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Beaver County, PA, Lawrence County, PA

The radar

The Pittsburgh radar (KPBZ), 35 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 52 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 2019-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 545 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 2019-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 square meters per square second.1939Sfc1 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
545 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1113 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 20, 3:49 PM EDT, 1 hour 44 minutes earlier.

Area forecast discussion, Aug 20, 3:49 PM EDT, 1 hour 44 minutes before
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Hazardous weather outlook, Aug 20, 10:30 AM EDT, 7 hours 3 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Pittsburgh PA
1030 AM EDT Tue Aug 20 2019

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-211430-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-
Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-
Forest-Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-
Armstrong-Indiana-Washington-Greene-Westmoreland-Westmoreland Ridges-
Fayette-Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-
Monongalia-Ridges of Eastern Monongalia and Northwestern Preston-
Preston-Eastern Preston-Western Tucker-Eastern Tucker-
1030 AM EDT Tue Aug 20 2019

This Hazardous Weather Outlook is for western Maryland, 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.

Severe thunderstorms are possible this afternoon and evening, and
will be capable of producing damaging wind gusts and possibly hail.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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.

Kramar

In the hours before

Special weather statement, Aug 20, 11:37 AM EDT, 5 hours 56 minutes before
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Special weather statement, Aug 20, 2:39 PM EDT, 2 hours 54 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
239 PM EDT Tue Aug 20 2019

WVZ514-201915-
Eastern Tucker-
239 PM EDT Tue Aug 20 2019

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT SOUTHEASTERN TUCKER COUNTY...

At 239 PM EDT, a strong thunderstorm was located 12 miles south of
Davis, moving northeast at 15 mph.

Wind gusts up to 55 mph and small hail are possible with this storm.

Locations impacted include...
Cortland...                       Canaan Valley State Park...
Laneville...                      Red Creek...

This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.

LAT...LON 3898 7947 3898 7950 3897 7950 3899 7956
      3913 7938 3911 7934 3908 7935 3908 7933
      3907 7932 3907 7930 3905 7930 3904 7932
      3902 7931 3896 7935
TIME...MOT...LOC 1839Z 212DEG 13KT 3895 7945
Special weather statement, Aug 20, 4:28 PM EDT, 1 hour 5 minutes before
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Special weather statement, Aug 20, 5:29 PM EDT, 4 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
529 PM EDT Tue Aug 20 2019

PAZ013-202200-
Lawrence-
529 PM EDT Tue Aug 20 2019

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT SOUTHEASTERN LAWRENCE COUNTY...

At 529 PM EDT, a strong thunderstorm was located near Ellwood City,
or 7 miles south of New Castle, moving east at 5 mph.

Wind gusts up to 55 mph and small hail are possible with this storm.

Locations impacted include...
Ellwood City...                   Big Beaver...
New Beaver...                     Ellport...
Wampum...                         McConnells Mill...
Rose Point Park...

This includes  Pennsylvania Turnpike between mile markers 7 and 8.

This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.

LAT...LON 4086 8016 4085 8041 4094 8042 4101 8016
TIME...MOT...LOC 2129Z 258DEG 6KT 4090 8036

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 5:29 PM EDTSpecial Weather StatementPBZLawrence31 min
Aug 20, 6:21 PM EDTSpecial Weather StatementPBZCoshocton24 min
Aug 20, 6:24 PM EDTSevere Thunderstorm WarningPBZCoshocton, Tuscarawas36 min
Aug 20, 6:42 PM EDTSevere Thunderstorm WarningPBZCoshocton, Tuscarawas48 min
Aug 20, 6:46 PM EDTSpecial Weather StatementPBZHarrison29 min
Aug 20, 7:16 PM EDTSevere Thunderstorm WarningPBZCarroll, Harrison, Jefferson44 min
Aug 20, 7:27 PM EDTSpecial Weather StatementPBZTuscarawas33 min
Aug 20, 7:32 PM EDTSevere Thunderstorm WarningPBZCarroll, Harrison, Tuscarawas43 min
Aug 20, 7:48 PM EDTSpecial Weather StatementPBZGuernsey27 min
Aug 20, 11:14 AM EDTSpecial Weather StatementPBZPreston31 min
Aug 20, 2:39 PM EDTSpecial Weather StatementPBZTucker36 min
Aug 20, 2:42 PM EDTSevere Thunderstorm WarningPBZTucker38 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.