Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 41, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 29, 1990, 6:45 PM EDT for Fayette County, Somerset County, Pennsylvania. It was in force for 75 min. 4 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
- Jun 29, 1990, 6:45 PM EDT (22:45 UTC)
- Expired
- Jun 29, 1990, 8:00 PM EDT
- In force
- 75 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Fayette County, PA, Somerset 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 |
|---|---|---|---|
| Jun 29, 6:45 PM EDT | Thunderstorm Wind 0 | Fayette, PA | |
| Jun 29, 7:30 PM EDT | Thunderstorm Wind 0 | Fayette, PA | |
| Jun 29, 7:30 PM EDT | Thunderstorm Wind 0 | Somerset, PA | |
| Jun 29, 7:30 PM EDT | Thunderstorm Wind 0 | Somerset, 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, 10.8 hours before the alert went out and 83 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
- 237 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1266 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Jun 29, 5:58 PM EDT, 47 minutes before
PAZ001>006-013>015-WVZ001-300000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 555 PM EDT FRI JUN 29 1990 ...SEVERE THUNDERSTORM WATCH AND FLASH FLOOD WATCH ON TIL 10 PM THIS EVENING FOR MUCH OF WESTERN PENNSYLVANIA NORTH OF PITTSBURGH AND JOHNSTOWN... JUST BEFORE 6 RADAR SHOWED THUNDERSTORMS WITH STRONG WIND GUSTS... DANGEROUS LIGHTNING...HAIL...AND HEAVY DOWNPOURS MOVING THROUGH BUTLER AND ARMSTRONG COUNTIES...THE PITTSBURGH AREA...WASHINGTON GREENE AND FAYETTE COUNTIES IN SOUTHWESTERN PENNSYLVANIA AND WETZEL AND MONONGAHELA COUNTIES IN NORTHERN WEST VIRGINIA. THERE WERE OTHER STRONG STORMS OVER CAMBRIA AND CENTRE COUNTIES IN THE CENTRAL PENNSYLVANIA MOUNTAI5NS. ALL WERE MOVING EASTSOUTHEAST AT 30 MILES AN HOUR. IF THREATENING WEATHER APPROACHES...TAKE COVER.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 6:00 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Washington | 60 min |
| Jun 29, 6:10 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 65 min |
| Jun 29, 6:45 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 75 min |
| Jun 29, 7:30 PM EDT | Severe Thunderstorm Warning | PBZ | Blair, Cambria | 60 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.