Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 62, NWS Pittsburgh, PA

June 3, 20204 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 3, 2020, 9:26 AM EDT for 4 counties in Pennsylvania. It was in force for 49 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
Jun 3, 2020, 9:26 AM EDT (13:26 UTC)
Expired
Jun 3, 2020, 10:15 AM EDT
In force
49 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, Indiana County, PA, Jefferson County, PA

The radar

The Pittsburgh radar (KPBZ), 94 km from the middle of the area, began a volume at 13:28 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, 1.4 hours before the alert went out and 94 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 2020-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2020-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1411 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
299 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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 Jun 3, 8:39 AM EDT, 47 minutes earlier.

Area forecast discussion, Jun 3, 8:39 AM EDT, 47 minutes before
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Hazardous weather outlook, Jun 3, 3:05 AM EDT, 6 hours 21 minutes before
Hazardous Weather Outlook
National Weather Service Pittsburgh PA
305 AM EDT Wed Jun 3 2020

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-040715-
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-
305 AM EDT Wed Jun 3 2020

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

.DAY ONE...Today and tonight.

Widespread thunderstorms are expected this afternoon and evening
along a cold frontal boundary. Scattered strong to severe storms will
be possible. Damaging wind gusts and large hail will be the primary
hazards, but isolated tornadoes are also possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Isolated strong to severe thunderstorms may be possible on Thursday
afternoon and evening as additional convection develops across
southern portions of the area. Damaging winds and large hail will
again be the primary hazards associated with any severe
thunderstorms.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Jun 3, 8:13 AM EDT, 1 hour 13 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
813 AM EDT Wed Jun 3 2020

PAZ007>009-015-031245-
Forest-Clarion-Venango-Mercer-
813 AM EDT Wed Jun 3 2020

...A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING HAIL AND GUSTY
WIND WILL AFFECT NORTHEASTERN MERCER...VENANGO...NORTHERN CLARION AND
FOREST COUNTIES...

At 812 AM EDT, radar indicated strong thunderstorms were located
along a line extending from near Columbus to 7 miles south of
Meadville. Movement was southeast at 60 mph.

Wind gusts up to 45 mph and hail up to the size of nickels are
possible with these storms.

Locations impacted include...
Oil City...                       Franklin...
Marienville...                    Knox...
Sugarcreek...                     Tionesta...
Hasson Heights...                 Seneca...
Polk...                           Rouseville...
Shippenville...                   Cooperstown...

This includes  Interstate 80 in Pennsylvania between mile markers 46
and 52.

Frequent cloud to ground lightning is occurring with these storms.
Seek safe shelter inside a building or vehicle.

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

LAT...LON 4154 7896 4115 7964 4149 8013 4149 8000
      4160 7983 4162 7983 4162 7895
TIME...MOT...LOC 1212Z 314DEG 52KT 4190 7960 4155 8010

CL
Special weather statement, Jun 3, 9:14 AM EDT, 12 minutes before
Special Weather Statement
National Weather Service Pittsburgh PA
914 AM EDT Wed Jun 3 2020

PAZ014-015-022-031345-
Armstrong-Butler-Clarion-
914 AM EDT Wed Jun 3 2020

...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY
WIND WILL AFFECT NORTHEASTERN BUTLER...CENTRAL ARMSTRONG AND SOUTHERN
CLARION COUNTIES...

At 913 AM EDT, a strong thunderstorm was located 11 miles northeast
of Shanor-Northvue, or 13 miles northeast of Butler, moving east at
60 mph.

Wind gusts up to 45 mph and small hail are possible with this storm.

Locations impacted include...
Rimersburg...                     New Bethlehem...
Chicora...                        East Brady...
Parker...                         Dayton...
Bruin...                          Hawthorn...
Eau Claire...                     Petrolia...
Karns City...                     Fairview...

Frequent cloud to ground lightning is occurring with this storm. Seek
safe shelter inside a building or vehicle.

LAT...LON 4095 7988 4114 7980 4102 7921 4081 7926
TIME...MOT...LOC 1313Z 284DEG 50KT 4102 7976

CL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 3, 8:13 AM EDTSpecial Weather StatementPBZForest, Venango32 min
Jun 3, 8:26 AM EDTSevere Thunderstorm WarningPBZClarion, Forest, Venango34 min
Jun 3, 8:54 AM EDTSevere Thunderstorm WarningPBZClarion, Forest, Jefferson, Venango40 min
Jun 3, 9:14 AM EDTSpecial Weather StatementPBZArmstrong31 min
Jun 3, 2:41 PM EDTSpecial Weather StatementPBZNoble34 min
Jun 3, 3:06 PM EDTSevere Thunderstorm WarningPBZMonroe, Noble39 min
Jun 3, 3:44 PM EDTSpecial Weather StatementPBZMonroe31 min
Jun 3, 4:13 PM EDTSpecial Weather StatementPBZMonroe32 min
Jun 3, 3:38 PM EDTSpecial Weather StatementPBZWetzel37 min
Jun 3, 3:46 PM EDTSevere Thunderstorm WarningPBZMarion, Monongalia, Wetzel27 min
Jun 3, 4:11 PM EDTSevere Thunderstorm WarningPBZWetzel49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020Every severe thunderstorm warning in 2020

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.