Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 14, NWS Cleveland, OH

May 30, 1989Mercer County, Pennsylvania

NWS Cleveland, OH issued this severe thunderstorm warning at May 30, 1989, 6:31 PM EDT for Mercer County, Pennsylvania. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
May 30, 1989, 6:31 PM EDT (22:31 UTC)
Expired
May 30, 1989, 7:30 PM EDT
In force
59 min
Issued by
NWS Cleveland, OH
Area
Whole counties

County Mercer 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, 10.5 hours before the alert went out and 100 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 1989-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 1989-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 310 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
17 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
310 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

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 30, 5:54 PM EDT, 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ERIE, PA
544 PM EDT TUE MAY 30 1989

.......THUNDERSTORMS ACROSS NORTHWEST PENNSYLVANIA...

AT 545 PM WEATHER RADAR SHOWED A LINE OF SHOWERS AND THUNDERSTORMS LYING
EAST TO WEST ACROSS NORTHWEST PENNSYLVANIA.  THIS LINE WAS 30 MILES WIDE
AND EXTENDED FROM NEAR ANDOVER OHIO EASTWARD ACROSS THE SOUTHERN HALF
OF CRAWFORD COUNTY AND THE NORTHERN HALF OF VENANGO IN NORTHWEST PENNSYLVANIA.

THESE STORMS HAVE BEEN INCREASING IN COVERAGE AND INTENSITY OVER THE PAST
HOUR. THE LINE HAS SHOWN LITTLE MOVEMENT ALTHOUGH THE SEPERATE THUNDERSTORMS
IN THE LINE HAVE BEEN MOVING EASTWARD.

SOME OF THESE STORMS WILL CONTAIN STRONG GUSTY WINDS...DANGEROUS LIGHTuNING
...SMALL HAIL AND VERY HEAVY DOWNPOURS....FLOODING OF SMALL STREAMS AND
LOW LYING AREAS WILL OCCUR ESPECIALLY WHERE THUNDERSTORMS REPEAT OVER THE
SAME AREA.

PARRISH/WELLS
Special weather statement, May 30, 6:23 PM EDT, 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YOUNGSTOWN OH
523 PM EDT TUE MAY 30 1989

THUNDERSTORMS WITH HEAVY DOWNPOURS.. GUSTY WINDS AND FREQUENT LIGHTNING
WERE MOVING THROUGH TRUMBULL COUNTY IN OHIO AND MERCER COUNTY IN WESTERN
PENNSYLVANIA EARLY THIS EVENING.

AT 504 PM EDT A WIND GUST OF 56 MPH ACCOMPANIED A THUNDERSTORM AT THE
YOUNGSTOWN MUNICIPAL AIRPORT.  A BRIEF HEAVY DOWNPOUR WAS ALSO REPORTED.

PEOPLE IN EASTERN OHIO AND WESTERN PENNSYLVANIA SHOULD KEY AN EYE ON THE
WEATHER THIS EVENING AND BE PREPARED TO SEEK SHELTER SHOULD THREATENING
WEATHER APPROACH.

DOXEY

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The office that day

Everything else NWS Cleveland, OH issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 30, 6:22 PM EDTSevere Thunderstorm WarningCLEVenango68 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1989Every severe thunderstorm warning in 1989

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.