Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 57, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 5, 1990, 11:59 AM EDT for Washington County, Pennsylvania. It was in force for 61 min. 1 report 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
- Jul 5, 1990, 11:59 AM EDT (15:59 UTC)
- Expired
- Jul 5, 1990, 1:00 PM EDT
- In force
- 61 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
County Washington 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 |
|---|---|---|---|
| Jul 5, 12:15 PM EDT | Thunderstorm Wind 0 | Washington, 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, 4.0 hours before the alert went out and 28 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
- 2521 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.3
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, Jul 5, 10:48 AM EDT, 1 hour 11 minutes before
PAZ003-005-006-013>015-WVZ001-051900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1045 AM EDT THU JUL 5 1990 ...THUNDERSTORMS WITH STRONG WIND GUSTS AND HEAVY DOWNPOURS ARE POSSIBLE LATE THIS MORNING AND THIS AFTERNOON ACROSS THE NORTHERN WEST VIRGINIA PANHANDLE AND SOUTHERN PENNSYLVANIA... A LINE OF SHOWERS AND THUNDERSTORMS HAVE DEVELOPED THIS MORNING AND EXTENDED FROM DUBOIS THROUGH SLIPPERY ROCK TO NEW CASTLE INTO OHIO. THE LINE WAS ABOUT 20 MILES WIDE AND WAS MOVING SOUTHEAST AT 25 MILES AN HOUR. SOME STORMS MAY HAVE STRONG WIND GUSTS AND HAIL PLUS DANGEROUS LIGHTNING AND HEAVY DOWNPOURS THAT MAY CAUSE FLOODING IN LOW-LYING PLACES AND AREAS OF POOR DRAINAGE. THE LINE WILL MOVE THROUGH THE GREATER PITTSBURGH AIRPORT AREA AROUND 1130 AM...THE CITY OF PITTSBURGH AROUND NOON...SOUTHERN ALLEGHENY COUNTY AROUND 1230 PM...AND THE JOHNSTOWN AREA AROUND 130 PM. KEEP AN EYE ON THE SKY FOR THREATENING THUNDERSTORMS...AND LISTEN FOR FORECAST UPDATES AND POSSIBLE WATCHES AND WARNINGS. ALSO KEEP THESE SAFETY TIPS IN MIND. WHENEVER THUNDERSTORMS THREATEN...ITS BEST TO TAKE SHELTER INSIDE A STRONG BUILDING AND AWAY FROM GLASS. IF YOU ARE CAUGHT OUTSIDE...BE AWARE THAT LIGHTNING IS AS MUCH A HAZARD AS HIGH WIND. AVOID ISOLATED TREES AND METAL OBJECTS. GO TO LOW SPOTS...CROUCH DOWN AND COVER YOUR HEAD...BUT LOOKOUT FOR FLOODING FROM HEAVY DOWNPOURS. WHEN FLOODING THREATENS...SEEK HIGHER GROUND...BUT DONT GO THROUGH ANY FLOOD WATERS TO GET THERE. THATS TRUE WHETHER YOU ARE DRIVING OR ON FOOT. TODAYS STRONGER THAN USUAL THUNDERSTORMS WILL BE CAUSED BY A COLD FRONT SLICING THROUGH THE HIGH HEAT AND HUMIDITY CURRENTLY OVER THE WESTERN PENNSYLVANIA REGION. THE GOOD NEWS FOR TONIGHT AND FRIDAY IS THE COMFORTABLY COOLER AND DRIER AIR BEHIND THIS FRONT. STEWART/PALKO/REHAK/WAGNER
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 12:14 PM EDT | Severe Thunderstorm Warning | PBZ | Cambria, Indiana | 61 min |
| Jul 5, 12:32 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 58 min |
| Jul 5, 12:59 PM EDT | Severe Thunderstorm Warning | PBZ | Blair, Cambria, Westmoreland | 61 min |
| Jul 5, 12:59 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 61 min |
| Jul 5, 1:32 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Somerset | 58 min |
| Jul 5, 1:32 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 58 min |
| Jul 5, 2:34 PM EDT | Flash Flood Warning | PBZ | Fayette | 2 hr |
| Jul 5, 2:34 PM EDT | Severe Thunderstorm Warning | PBZ | Somerset | 56 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.