Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 183, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 20, 2021, 8:32 PM EDT for 5 counties in Pennsylvania. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2021, 8:32 PM EDT (00:32 UTC)
- Expired
- Jul 20, 2021, 9:15 PM EDT
- In force
- 43 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, Forest County, PA, Indiana County, PA, Jefferson County, PA
The radar
The State College radar (KCCX), 85 km from the middle of the area, began a volume at 00:33 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, 0.5 hours before the alert went out and 133 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.
- Mixed-layer CAPE
- 416 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1443 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
357
WUUS51 KPBZ 210032
SVRPBZ
PAC005-031-053-063-065-210115-
/O.NEW.KPBZ.SV.W.0183.210721T0032Z-210721T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
832 PM EDT Tue Jul 20 2021
The National Weather Service in Pittsburgh has issued a
* Severe Thunderstorm Warning for...
Northeastern Indiana County in west central Pennsylvania...
Jefferson County in west central Pennsylvania...
East central Armstrong County in west central Pennsylvania...
Southeastern Clarion County in west central Pennsylvania...
Southeastern Forest County in northwestern Pennsylvania...
* Until 915 PM EDT.
* At 832 PM EDT, a severe thunderstorm was located over Brookville,
moving southeast at 35 mph.
HAZARD...Wind gusts to 60 mph and quarter-size hail.
SOURCE...Radar.
IMPACT...Minor hail damage to vehicles is possible. Expect wind
damage to trees and power lines, resulting in some power
outages.
* Locations impacted include...
Punxsutawney... Clarion...
Brookville... Reynoldsville...
Brockway... New Bethlehem...
Sykesville... Falls Creek...
Sligo... Big Run...
Dayton... Strattanville...
This includes Interstate 80 in Pennsylvania between mile markers 61
and 96.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm has produced damaging wind and large hail. Move indoors
and stay away from windows!
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4120 7877 4113 7880 4085 7881 4085 7928
4115 7953 4135 7907 4135 7905 4136 7903
4135 7902 4138 7897 4136 7896 4126 7874
4123 7874 4123 7871 4120 7871
TIME...MOT...LOC 0032Z 321DEG 30KT 4114 7908
HAIL...1.00IN
WIND...60MPH
$$2 follow-up statements
876
WWUS51 KPBZ 210055
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
855 PM EDT Tue Jul 20 2021
PAC005-031-053-063-065-210115-
/O.CON.KPBZ.SV.W.0183.000000T0000Z-210721T0115Z/
Indiana PA-Jefferson PA-Armstrong PA-Clarion PA-Forest PA-
855 PM EDT Tue Jul 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR NORTHEASTERN INDIANA...JEFFERSON...EAST CENTRAL ARMSTRONG...
SOUTHEASTERN CLARION AND SOUTHEASTERN FOREST COUNTIES...
At 854 PM EDT, a severe thunderstorm was located near Punxsutawney,
and is nearly stationary.
HAZARD...Wind gusts to 60 mph.
SOURCE...Radar.
IMPACT...Expect damage to trees and power lines, resulting in some
power outages.
Locations impacted include...
Punxsutawney... Clarion...
Brookville... Reynoldsville...
Brockway... New Bethlehem...
Sykesville... Falls Creek...
Sligo... Big Run...
Dayton... Strattanville...
This includes Interstate 80 in Pennsylvania between mile markers 61
and 96.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm has produced damaging wind and large hail. Move indoors
and stay away from windows!
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4120 7877 4113 7880 4085 7881 4085 7928
4115 7953 4135 7907 4135 7905 4136 7903
4135 7902 4138 7897 4136 7896 4126 7874
4123 7874 4123 7871 4120 7871
TIME...MOT...LOC 0054Z 321DEG 30KT 4101 7894
HAIL...<.75IN
WIND...60MPH
$$342
WWUS51 KPBZ 210105
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
905 PM EDT Tue Jul 20 2021
PAC005-031-053-063-065-210115-
/O.EXP.KPBZ.SV.W.0183.000000T0000Z-210721T0115Z/
Indiana PA-Jefferson PA-Armstrong PA-Clarion PA-Forest PA-
905 PM EDT Tue Jul 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN INDIANA...
JEFFERSON...EAST CENTRAL ARMSTRONG...SOUTHEASTERN CLARION AND
SOUTHEASTERN FOREST COUNTIES WILL EXPIRE AT 915 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
LAT...LON 4120 7877 4113 7880 4085 7881 4085 7928
4115 7953 4135 7907 4135 7905 4136 7903
4135 7902 4138 7897 4136 7896 4126 7874
4123 7874 4123 7871 4120 7871
TIME...MOT...LOC 0105Z 321DEG 30KT 4095 7887
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:31 PM EDT | Special Weather Statement | PBZ | Beaver | 29 min |
| Jul 20, 8:45 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 30 min |
| Jul 20, 9:11 PM EDT | Special Weather Statement | PBZ | Butler | 34 min |
| Jul 20, 9:16 PM EDT | Special Weather Statement | PBZ | Armstrong | 29 min |
| Jul 20, 9:39 PM EDT | Special Weather Statement | PBZ | Armstrong | 36 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm warning in 2021
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.