Alert archive / Pennsylvania / Tornado Warnings in 2021
Tornado Warning 21, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this tornado warning at Oct 21, 2021, 6:42 PM EDT for Mercer County, Pennsylvania. It was in force for 18 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
- Oct 21, 2021, 6:42 PM EDT (22:42 UTC)
- Expired
- Oct 21, 2021, 7:00 PM EDT
- In force
- 18 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Mercer County, PA
The radar
The Pittsburgh radar (KPBZ), 79 km from the middle of the area, began a volume at 22:44 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, 10.7 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1175 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
961
WFUS51 KPBZ 212242
TORPBZ
PAC085-212300-
/O.NEW.KPBZ.TO.W.0021.211021T2242Z-211021T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pittsburgh PA
642 PM EDT Thu Oct 21 2021
The National Weather Service in Pittsburgh has issued a
* Tornado Warning for...
Central Mercer County in northwestern Pennsylvania...
* Until 700 PM EDT.
* At 641 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Hermitage, moving east at 40 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Grove City around 700 PM EDT.
Other locations impacted by this tornadic thunderstorm include
Stoneboro, Clark, Sandy Lake, Fredonia, Jackson Center, Mercer, West
Middlesex and Maurice K Goddard State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4118 8047 4130 8045 4139 8002 4115 8003
TIME...MOT...LOC 2241Z 263DEG 37KT 4122 8042
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$2 follow-up statements
719
WWUS51 KPBZ 212252
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
652 PM EDT Thu Oct 21 2021
PAC085-212300-
/O.CON.KPBZ.TO.W.0021.000000T0000Z-211021T2300Z/
Mercer PA-
652 PM EDT Thu Oct 21 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR EAST
CENTRAL MERCER COUNTY...
At 652 PM EDT, a severe thunderstorm capable of producing a tornado
was located 8 miles east of Hermitage, moving east at 40 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
east central Mercer County, including the following locations...
Stoneboro, Sandy Lake, Fredonia, Mercer, Jackson Center and Maurice K
Goddard State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4120 8038 4130 8037 4139 8002 4119 8003
TIME...MOT...LOC 2252Z 253DEG 36KT 4127 8027
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$237
WWUS51 KPBZ 212258
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
658 PM EDT Thu Oct 21 2021
PAC085-212307-
/O.EXP.KPBZ.TO.W.0021.000000T0000Z-211021T2300Z/
Mercer PA-
658 PM EDT Thu Oct 21 2021
...THE TORNADO WARNING FOR EAST CENTRAL MERCER COUNTY WILL EXPIRE AT
700 PM EDT...
The storm which prompted the warning has weakened below severe
limits. Therefore, the warning will be allowed to expire. However
gusty winds are still possible with this thunderstorm.
LAT...LON 4120 8038 4130 8037 4139 8002 4119 8003
TIME...MOT...LOC 2257Z 263DEG 37KT 4127 8024
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 21, 2:03 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 27 min |
| Oct 21, 2:36 PM EDT | Special Weather Statement | PBZ | Mercer, Venango | 24 min |
| Oct 21, 2:50 PM EDT | Special Weather Statement | PBZ | Lawrence | 25 min |
| Oct 21, 3:18 PM EDT | Special Weather Statement | PBZ | Butler, Lawrence | 27 min |
| Oct 21, 3:49 PM EDT | Special Weather Statement | PBZ | Clarion, Forest, Venango | 41 min |
| Oct 21, 4:08 PM EDT | Special Weather Statement | PBZ | Washington | 37 min |
| Oct 21, 4:32 PM EDT | Special Weather Statement | PBZ | Clarion, Forest, Jefferson | 43 min |
| Oct 21, 4:47 PM EDT | Special Weather Statement | PBZ | Allegheny, Washington | 43 min |
| Oct 21, 5:48 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Jefferson | 27 min |
| Oct 21, 6:00 PM EDT | Special Weather Statement | PBZ | Lawrence, Mercer, Venango | 45 min |
| Oct 21, 6:18 PM EDT | Special Weather Statement | PBZ | Beaver | 42 min |
| Oct 21, 6:56 PM EDT | Tornado Warning | PBZ | Beaver, Butler, Lawrence | 19 min |
| Oct 21, 6:57 PM EDT | Tornado Warning | PBZ | Washington | 33 min |
| Oct 21, 7:13 PM EDT | Tornado Warning | PBZ | Greene, Washington | 32 min |
| Oct 21, 7:19 PM EDT | Special Weather Statement | PBZ | Allegheny, Beaver, Butler | 41 min |
| Oct 21, 7:24 PM EDT | Tornado Warning | PBZ | Butler | 36 min |
| Oct 21, 7:26 PM EDT | Tornado Warning | PBZ | Washington | 34 min |
| Oct 21, 7:40 PM EDT | Tornado Warning | PBZ | Allegheny, Beaver, Westmoreland | 20 min |
Nearby
Tornado Warnings in Pennsylvania, 2021Every tornado warning in 2021Tornadoes 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.