Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 31, NWS Cleveland, OH

June 18, 1990Potter County, Pennsylvania

NWS Cleveland, OH issued this severe thunderstorm warning at Jun 18, 1990, 11:14 AM EDT for Potter 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
Jun 18, 1990, 11:14 AM EDT (15:14 UTC)
Expired
Jun 18, 1990, 12:15 PM EDT
In force
61 min
Issued by
NWS Cleveland, OH
Area
Whole counties

County Potter 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

TimeReportWhereRemark
Jun 18, 11:40 AM EDTHail 0.75Potter, 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 12:00Z, 3.2 hours before the alert went out and 147 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, Buffalo Intl Airport, NY at 12:00Z on 1990-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2093 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, Buffalo Intl Airport, NY at 12:00Z on 1990-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 square meters per square second.1939587897Sfc1 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
2093 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
690 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KERI 181514
SVRERI
PAC105-181615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE ERIE PA
1114 AM EDT MON JUN 18 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
AND FLASH FLOOD WARNING EFFECTIVE UNTIL 1215 PM EDT FOR PEOPLE 
IN THE FOLLOWING COUNTY

   IN THE NORTHWEST PART OF PENNSYLVANIA
      POTTER

AT 1100 AM EDT WEATHER RADAR SHOWED A SEVERE THUNDERSTORM JUST
NORTH OF COUDERSPORT IN POTTER COUNTY.  THIS STORM IS PRODUCING
TORRENTIAL DOWNPOURS AND WILL BE ACCOMPANIED BY STRONG WINDS...
DANGERSOUS LIGHTNING AND POSSIBLE HAIL.

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

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 18, 5:19 AM EDT, 5 hours 55 minutes before
OHZALL-191200-

SEVERE WEATHER OUTLOOK FOR OHIO
NATIONAL WEATHER SERVICE CLEVELAND OH
520 AM EDT MON JUN 18 1990

THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY SAYS THAT
THERE IS A SLIGHT CHANfCE OF SEVERE THUNDERSTORMS IN SOUTHEAST OHIO TODAY.
NO SEVERE THUNDERSTORMS ARE EXPECTED IN OHIO TONIGHT.

SJN
Special weather statement, Jun 18, 5:30 AM EDT, 5 hours 44 minutes before
PAZ001-002-181100
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ERIE, PA
530 AM EDT MON JUN 18 1990

...A LINE OF STRONG THUNDERSTORMS ARE HEADED FOR NORTHWEST PENNSYLVANIA
AND  THE PENNSYLVANIA WATERS OF LAKE ERIE...

AT 530 AM ERIE WEATHER RADAR INDICATED A LINE OF STRONG THUNDERSTORMS
SITUATED FROM ASHTABULA COUNTY IN OHIO AND EXTENDING NORTH ACROSS LAKE
ERIE INTO THE PORT BURWELL AND LONG POINT AREAS.

THE LINE WAS MOVING TO THE EAST AT AROUND 45 TO 50 MILES AND HOUR AND
WILL BE MOVING INTO PARTS OF NORTHWEST PENNSYLVANIA AND THE PENNSYLVANIA
WATERS OF LAKE ERIE...BETWEEN 545 AND 600 AM THIS MORNING.

SOME OF THESE STORMS MAY PRODUCE VERY HEAVY RAIN...STRONG AND GUSTY WINDS
AND HAIL.
SANDSTROM
Special weather statement, Jun 18, 6:10 AM EDT, 5 hours 4 minutes before
OHZ004-007-DDHHHH-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AKRON CANTON OH
610 AM EDT MON JUN 18 1990

AT 600 AM WEATHER SERVICE RADAR SHOWED A LINE OF THUNDERSTORMS OVER
EAST CENTRAL OHIO THAT EXTEND FROM NEAR ST. CLAIRSVILLE IN BELMONT
COUNTY SOUTH TO MARIETTA IN WASHINGTON COUNTY. THESE STORMS ARE MOVING
EAST AT 35 MPH AND COULD PRODUCE LOCALLY HEAVY RAINS... SMALL HAIL...
AND BRIEF WIND GUST AS THEY MOVE THROUGH.

THESE STORMS SHOU$LD REACH THE OHIO RIVER IN BELMONT AND MONROE COUNTIES
BETWEEN 630AM AND 700AM.

ALTO
Special weather statement, Jun 18, 10:17 AM EDT, 57 minutes before
PAZ003-181600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE YOUNGSTOWN OH
1016 AM EDT MON JUN 18 1990

THUNDERSTORMS WITH HEAVY RAIN WERE MOVING THROUGH LAWRENCE COUNTY
PENNSYLVANIA THIS MORNING.

AT 1010 AM NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
THUNDERSTORMS FROM FRANKLIN PENNSYLVAINA THROUGH NEWCASTLE TO
THE OHIO-PENNSYLVANIA BORDER. THESE STORMS WERE MOVING EAST AT
35 MPH AND WILL MOVE OUT OF LAWRENCE COUNTY BY 11 AM.

VERvY HEAVY RAIN... STRONG GUSTY WINDS AND SMALL HAIL ARE POSSIBLE
WITH THE PASSAGE OF THESE STORMS.

APFEL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 5:54 AM EDTSevere Thunderstorm WarningCLEErie66 min
Jun 18, 6:53 AM EDTSevere Thunderstorm WarningCLEErie82 min
Jun 18, 9:08 AM EDTSevere Thunderstorm WarningCLEMcKean67 min
Jun 18, 10:36 AM EDTFlash Flood WarningCLEElk, McKean3 hr
Jun 18, 11:14 AM EDTFlash Flood WarningCLEPotter61 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.