Alert archive / Pennsylvania / Tornado Warnings in 1991
Tornado Warning 3, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this tornado warning at May 6, 1991, 2:18 PM EDT for Armstrong County, Westmoreland County, Pennsylvania. It was in force for 57 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 6, 1991, 2:18 PM EDT (18:18 UTC)
- Expired
- May 6, 1991, 3:15 PM EDT
- In force
- 57 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Armstrong County, PA, Westmoreland County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 6, 2:18 PM EDT | Thunderstorm Wind 0 | Armstrong, PA | |
| May 6, 2:48 PM EDT | Thunderstorm Wind 0 | Westmoreland, PA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 6.3 hours before the alert went out and 56 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
- 250 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 604 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 1:11 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 64 min |
| May 6, 1:20 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 55 min |
| May 6, 1:44 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 61 min |
| May 6, 2:02 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 58 min |
| May 6, 2:34 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Somerset | 56 min |
| May 6, 2:34 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 56 min |
| May 6, 2:43 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield, Jefferson | 62 min |
| May 6, 3:05 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford | 55 min |
| May 6, 3:27 PM EDT | Severe Thunderstorm Warning | PBZ | Blair | 63 min |
Nearby
Tornado Warnings in Pennsylvania, 1991Every tornado warning in 1991Tornadoes in 1991
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.