Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 21, NWS Cleveland, OH

March 28, 1991Crawford County, Erie County, Pennsylvania

NWS Cleveland, OH issued this severe thunderstorm warning at Mar 28, 1991, 12:20 AM EST for Crawford County, Erie County, Pennsylvania. It was in force for 85 min. 6 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: Mar 28, 1991, 12:20 AM EST (05:20 UTC)
Expired: Mar 28, 1991, 1:45 AM EST
In force: 85 min
Issued by: NWS Cleveland, OH
Area: Whole counties

Counties Crawford County, PA, Erie County, PA

What was reported inside it

Time	Report	Where
Mar 28, 1:00 AM EST	Thunderstorm Wind 0	Erie, PA
Mar 28, 1:05 AM EST	Hail 1.75	Erie, PA
Mar 28, 1:10 AM EST	Thunderstorm Wind 0	Erie, PA
Mar 28, 1:15 AM EST	Hail 1.5	Erie, PA
Mar 28, 1:30 AM EST	Thunderstorm Wind 56	Crawford, PA
Mar 28, 1:40 AM EST	Thunderstorm Wind 0	Crawford, 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

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 5.3 hours before the alert went out and 162 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 40 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 1263 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 435 m²/s²
0-3 km storm-relative helicity: 563 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KERI 280520
SVRERI
PAC049-039-280645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE ERIE PA
1220 AM EST THU MAR 28 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 145 AM EST FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTHWEST PART OF PENNSYLVANIA
      ERIE...CRAWFORD...ADJACENT LAKE ERIE WATERS

AT 1215 AM RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS FROM
ASHATABULA COUNTY IN OHIO SOUTHWESTWARD TO NEAR MANSFIELD OHIO.
THIS LINE IS MOVING EASTWARD AT 40 MILES AN HOUR.

NUMEROUS REPORTS OF WIND DAMAGE...POWER OUTAGES AND LARGE HAIL
HAVE BEEN REPORTED WITH THIS LINE AS IT MOVED ACROSS NORTHERN OHIO.

WHEN THUNDERSTORMS ARE OCCURRING...PEAOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND NEAR WINDOWS.  DO NOT USE TELEPHONES
OR ELECTRICAL APPLIANCES.  MOTORISTS SHOULD AVOID LOW WATER CROSSINGS.

IF YOU ARE CAUGHT OUTSIDE...FIND SHELTER IN A NEARBY REINFORCED
BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND DANGEROUS
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.

THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH...PREPARE FOR
DAMAGING WINDS...LARGE HAIL AND DANGEROUS LaIGHTNING.  PEAPLE OUTSIDE
SHOULD MOVE TO SHELTER.  STAY AWAY FROM WINDOWS.

SMALL BOATERS ON LAKE ERIE AND PREQUE ISLE BAY SHOULD SEEK SAFE
HARBOR IF THREATENING WEATHER APPROACHES.

 TP

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1991 Every severe thunderstorm warning 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.