Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 99, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 29, 1990, 12:08 AM EDT for Fayette County, Somerset County, Westmoreland County, Pennsylvania. It was in force for 67 min. 3 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
- Aug 29, 1990, 12:08 AM EDT (04:08 UTC)
- Expired
- Aug 29, 1990, 1:15 AM EDT
- In force
- 67 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Fayette County, PA, Somerset County, PA, Westmoreland County, PA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 29, 12:10 AM EDT | Thunderstorm Wind 0 | Fayette, PA | |
| Aug 29, 12:15 AM EDT | Thunderstorm Wind 0 | Somerset, PA | |
| Aug 29, 12:30 AM 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 00:00Z, 4.1 hours before the alert went out and 72 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
- 2368 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 10.7
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 |
|---|---|---|---|---|
| Aug 28, 8:16 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Jefferson | 59 min |
| Aug 28, 10:19 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 56 min |
| Aug 28, 10:38 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 67 min |
| Aug 28, 11:12 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Somerset, Westmoreland | 63 min |
| Aug 28, 11:12 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 63 min |
| Aug 28, 11:17 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 43 min |
| Aug 28, 11:47 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford | 58 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1990Every severe thunderstorm warning in 1990
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.