Alert archive / Ohio / Flash Flood Warnings in 1991

Flash Flood Warning 10, NWS Cleveland, OH

July 6, 1991Mahoning County, Ohio; Lawrence County, Pennsylvania

NWS Cleveland, OH issued this flash flood warning at Jul 6, 1991, 4:13 PM EDT for Mahoning County, Ohio; Lawrence County, Pennsylvania. It was in force for 62 min.

The area

The counties it named.

The facts

Issued
Jul 6, 1991, 4:13 PM EDT (20:13 UTC)
Expired
Jul 6, 1991, 5:15 PM EDT
In force
62 min
Issued by
NWS Cleveland, OH
Area
Whole counties

Counties Mahoning County, OH, Lawrence County, PA

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.2 hours before the alert went out and 263 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 1991-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 687 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 1991-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 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
687 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.9

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 flash flood 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 6, 1:14 PM EDT, 2 hours 59 minutes before
OHZ004-007-061900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AKRON CANTON OH
112 PM EDT SAT JUL 6 1991

THUNDERSTORMS...PRODUCING VERY HEAVY RAIN...HAD DEVELOPED OVER
PARTS OF NORTHEAST OHIO EARLY THIS AFTERNOON.

AT 1:10 PM WEATHER RADAR INDICATED THE HEAVIEST RAINFALL OVER
CENTRAL PORTAGE COUNTY.

WIDELY SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP THE
REMAINDER OF THIS AFTERNOON AND EVENING OVER EASTERN OHIO.
SOME OF THESE STORMS WILL BE CAPABLE OF DROPPING OVER AN INCH OF
RAIN IN LESS THAN AN HOUR.

RAINFALL OF THIS INTENSITY WILL CAUSE BRIEF PONDING OF WATER ON ROADWAYS
AND IN LOW LYING AREAS. MOTORISTS SHOULD ALSO BE ALERT FOR GREATLY
REDUCED VISIBILITIES.
THOMPSON
Special weather statement, Jul 6, 2:31 PM EDT, 1 hour 42 minutes before
OHZALL-062100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OHIO
230 PM EDT FRI JUL 5 1991

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF NORTHEAST AND
EASTCENTRAL OHIO UNTIL 1000 PM EDT...

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR PARTS OF NORTHEAST AND EASTCENTRAL OHIO UNTIL 1000 PM EDT. SOME
CITIES INCLUDED IN THIS WATCH ARE AKRON...CANTON...YOUNGSTOWN...
ASHTABULA...AND STEUBENVILLE.

AT 230 PM EDT RADAR SHOWED SCATTERED THUNDERSTORMS LINED UP FROM JUST
EAST OF AKRON TO THE YOUNGSTOWN AREA TO THE FRANKLIN AREA OF
PENNSYLVANIA. THE THUNDERSTORMS WERE POPPING UP AND DOWN RATHER
QUICKLY AS THEY MOVED EAST AT ABOUT 30 MPH.

ANY OF THE THUNDERSTORMS OVER NORTHEAST AND EASTCENTAL OHIO CAN BECOME
SEVERE AND PRODUCE DAMAGING WINDS AND LARGE HAIL. VERY HEAVY DOWNPOURS
OF RAIN CAN ALSO OCCUR WITH TEMPORARY URBAN AND DRAINING SYSTEM
FLOODING THE RESULT.

THE REMAINDER OF OHIO ALSO HAS A CHANCE OF SHOWERS AND THUNDERSTORMS
FOR THIS AFTERNOON THROUGH TONIGHT.
KAPELA
Special weather statement, Jul 6, 2:36 PM EDT, 1 hour 37 minutes before
OHZALL-062100-

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE CLEVELAND OHIO
230 PM EDT SAT JUL 6 1991

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF NORTHEAST AND
EASTCENTRAL OHIO UNTIL 1000 PM EDT...

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR PARTS OF NORTHEAST AND EASTCENTRAL OHIO UNTIL 1000 PM EDT. SOME
CITIES INCLUDED IN THIS WATCH ARE CANTON...YOUNGSTOWN...ASHTABULA...
AND STEUBENVILLE.

AT 230 PM EDT RADAR SHOWED SCATTERED THUNDERSTORMS LINED UP FROM JUST
EAST OF AKRON TO THE YOUNGSTOWN AREA TO THE FRANKLIN AREA OF
PENNSYLVANIA. THE THUNDERSTORMS WERE POPPING UP AND DOWN RATHER
QUICKLY AS THEY MOVED EAST AT ABOUT 30 MPH.

ANY OF THE THUNDERSTORMS OVER NORTHEAST AND EASTCENTAL OHIO CAN BECOME
SEVERE AND PRODUCE DAMAGING WINDS AND LARGE HAIL. VERY HEAVY DOWNPOURS
OF RAIN CAN ALSO OCCUR WITH TEMPORARY URBAN AND DRAINING SYSTEM
FLOODING THE RESULT.

THE REMAINDER OF OHIO ALSO HAS A CHANCE OF SHOWERS AND THUNDERSTORMS
FOR THIS AFTERNOON THROUGH TONIGHT.

KAPELA
CORRECTED FOR DATE AND CITIES INCLUDED IN WATCH
Special weather statement, Jul 6, 2:55 PM EDT, 1 hour 18 minutes before
PAZ003-062000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ERIE, PA
250 PM EDT SAT JUL 06 1991

...THUNDERSTORMS PRODUCING HEAVY RAIN AND INTENSE LIGHTNING OVER SOUTHERN
VENANGO COUNTY OF NORTHWEST PENNSYLVANIA...
...SEVERE THUNDERSTORM WATCH UNTIL 1000 PM FOR ALL OF WESTERN PENNSYLVANIA
EXCEPT ERIE COUNTY...

AT 240 PM EDT WEATHER RADAR SHOWED A LINE OF THUNDERSTORMS EXTENDING FROM
YOUNGSTOWN OHIO EASTWARD TO DUBOIS TO SOUTHERN CAMERON COUNTY.  THE LINE
OF THUNDERSTORMS WAS DRIFTING SLOWLY TO THE SOUTH.  THE THUNDERSTORMS CELLS
WITHIN THE LINE WERE MOVING TO THE EAST AT ABOUT 30 MILES AN HOUR.

THE STATE POLICE IN VENANGO COUNTY REPORTED VERY HEAVY RAIN AND INTENSE
LIGHTNING NEAR INTERSTATE 80 IN SOUTHERN VENANGO COUNTY.

OTHER THUNDERSTORMS CELLS MOVING EAST FROM MERCER COUNTY WILL MOVE THROUGH
SOUTHERN VENANGO COUNTY WITHIN THE NEXT HOUR.  THESE THUNDERSTORMS WILL
CONTINUE TO BRING VERY HEAVY RAIN AND DANGEROUS LIGHTNING TO SOUTHERN
VENANGO COUNTY.  AS THESE STORMS CONTINUE TO MOVE ACROSS THE SAME AREAS...
SOME FLOODING MAY DEVELOP ALONG SMALL STREAMS AND LOW LYING AREAS.
TRAVELERS ALONG INTERSTATE 80 SHOULD BE PREPARED FOR VERY HEAVY DOWNPOURS THAT
MAY CAUSE PONDING OF WATER ON ROAD SURFACES  AND POOR VISIBILITY.

STAY TUNED TO NOAA WEATHER RADIO FOR MORE UPDATES OR POSSIBLE WARNINGS.

TJP
Special weather statement, Jul 6, 3:35 PM EDT, 38 minutes before
OHZALL-062130-

SPECIAL WEATHER STATEMENT AND AFTERNOON OHIO WEATHER STORY
NATIONAL WEATHER SERVICE CLEVELAND OHIO
335 PM EDT SAT JUL 6 1991

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR PARTS OF NORTHEAST
AND EAST CENTRAL OHIO UNTIL 10 PM EDT.

SOME CITIES IN THE WATCH AREA INCLUDE CANTON...YOUNGSTOWN...ASHTABULA
AND STEUBENVILLE.

ANY OF THE THUNDERSTORMS ARE CAPABLE OF PRODUCING LARGE HAIL...DAMAGING
WINDS AND VERY HEAVY DOWNPOURS.  KEEP ALERT FOR RAPIDLY CHANGING
WEATHER CONDITIONS.

FOR THE MOST PART TODAY WAS A SUNNY DAY ACROSS OHIO.  LATE THIS
AFTERNOON SHOWERS AND THUNDERSTORMS DEVELOPED RAPIDLY OVER PARTS OF
NORTHEAST OHIO.  AT 330 PM RADAR INDICATED A LINE OF SHOWERS AND
THUNDERSTORMS FROM NEAR RAVENNA TO YOUNGSTOWN TO SOUTH OF FRANKLIN
PENNSYLVANIA.  THE STORMS WERE MOVING SOUTHEAST 30 MPH.
<
AN AREA OF SHOWERS AND THUNDERSTORMS THIS MORNING CLIPPED THE SOUTHWEST
CORNER OF THE STATE WITH RAINFALL AMOUNTS IN THE CINCINNATI AREA FROM A
QUARTER TO A HALF INCH.  MIAMITOWN JUST WEST OF CINCINNATI RECEIVED
AN INCH OF RAIN DURING A THUNDERSTORM.

TEMPERATURES THIS AFTERNOON WERE IN THE MID 80S TO LOWER 90S.
HUMIDITIES WERE MOSTLY IN THE 50 TO 60 PERCENT RANGE MAKING IT A
BIT MORE MUGGY THAN YESTERDAY.

WINDS WERE MOSTLY FROM THE SOUTHWEST 10 TO 20 MPH AND GUSTY IN
SOME AREAS.

IT WILL BE PARTLY CLOUUDY WITH A CHANCE OF SHOWERS AND THUNDERSTORMS
OVER OHIO TONIGHT.  LOWS WILL BE 70 TO 75.  IT WILL BE PARTLY CLOUDY
SUNDAY THROUGH MONDAY WITH SCATTERED SHOWERS AND THUNDERSTORMS.  HIGHS
WILL BE 90 TO 95 SUNDAY AND IN THE MID TO UPPER 80S MONDAY.  LOWS
SUNDAY NIGHT WILL BE 65 TO 70.

LATE THIS AFTERNOON WEAK HIGH PRESSURE WAS OVER OHIO.  A COLD FRONT
WAS FROM WISCONSIN TO SOUTHERN NEBRASKA.  THE HIGH WILL MOVE SOUTH
TONIGHT WHILE THE COLD FRONT MOVES TO EXTREME NORTHERN OHIO BY SUNDAY
MORNING.  THE FRONT REMAIN NORTH OF OHIO AS A WARM FRONT SUNDAY NIGHT.
ANOTHER COLD FRONT WILL APPROACH NORTHWESpT OHIO MONDAY MORNING.
MORAVEK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 3:05 PM EDTSevere Thunderstorm WarningCLEMahoning55 min
Jul 6, 4:13 PM EDTSevere Thunderstorm WarningCLEMahoning62 min
Jul 6, 5:18 PM EDTFlash Flood WarningCLEMahoning57 min
Jul 6, 5:18 PM EDTSevere Thunderstorm WarningCLEMahoning57 min
Jul 6, 2:18 PM EDTSevere Thunderstorm WarningCLEMercer57 min
Jul 6, 3:15 PM EDTSevere Thunderstorm WarningCLEVenango60 min

Nearby

Flash Flood Warnings in Ohio, 1991Flash Flood Warnings in Pennsylvania, 1991Every flash flood 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; the sounding from the Mesonet's radiosonde archive.