Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 11, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at May 15, 1990, 3:58 PM EDT for Armstrong County, Pennsylvania. It was in force for 62 min.
The area
The counties it named.
The facts
- Issued
- May 15, 1990, 3:58 PM EDT (19:58 UTC)
- Expired
- May 15, 1990, 5:00 PM EDT
- In force
- 62 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
County Armstrong County, PA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 8.0 hours before the alert went out and 70 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
- 61 J/kg
- Mixed-layer CIN
- -163 J/kg
- Mixed-layer LCL
- 1172 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 195 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, May 15, 3:49 PM EDT, 9 minutes before
PAZ001>006-013>015-WVZ001-160300- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE PITTSBURGH PA 345 PM EDT SUN MAY 13 1990 ...THUNDERSTORMS WITH HEAVY DOWNPOURS HAIL GUSTY WIND AND DANGEROUS LIGHTNING DEVELOPING OVER WESTERN PENNSYLVANIA LATE THIS AFTERNOON AND TONIGHT... JUST BEFORE 4 PM PITTSBURGH WEATHER RADAR SHOWED THUNDERSTORMS IN WESTERN PENNSYLVANIA ALONG A LINE FROM LAWRENCE COUNTY EASTWARD THROUGH BUTLER AND ARMSTRONG COUNTIES TO CLEARFIELD AND CENTRE COUNTIES. SOME AREAS IN THESE COUNTIES MAY GET REPEATED HEAVY DOWNPOURS THROUGH 6 PM WHICH MAY RESULT IN ROADWAY AND OTHER POOR DRAINAGE TYPE FLOODING. SO USE EXTRA CAUTION. STRONG WIND GUSTS AND DANGEROUS LIGHTNING ARE ALSO POSSIBLE. WHEN A THUNDERSTORM APPROACHES...ITS SAFEST TO GO INSIDE. OTHER THUNDERSTORMS WILL BE DEVELOPING ACROSS WESTERN PENNSYLVANIA AND THE NORTHERN WEST VIRGINIA PANHANDLE THIS EVENING AND TONIGHT. SO BE ON THE LOOKOUT FOeR THUNDERSTORMS AND LISTEN FOR FURTHER ADVISORIES. GIORDANO/STAIRS/REHAK
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 4:53 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler | 3 hr |
| May 15, 6:02 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion | 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; the sounding from the Mesonet's radiosonde archive.