Alert archive / Ohio / Flash Flood Warnings in 1990

Flash Flood Warning 30, NWS Wilmington, OH

July 12, 1990Knox County, Ohio

NWS Wilmington, OH issued this flash flood warning at Jul 12, 1990, 9:10 AM EDT for Knox County, Ohio. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 12, 1990, 9:10 AM EDT (13:10 UTC)
Expired
Jul 12, 1990, 12:00 PM EDT
In force
3 hr
Issued by
NWS Wilmington, OH
Area
Whole counties

County Knox County, OH

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

Dayton/James M C, OH (KDAY), launched 12:00Z, 1.2 hours before the alert went out and 161 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, Dayton/James M C, OH at 12:00Z on 1990-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Dayton/James M C, OH at 12:00Z on 1990-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
573 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMFD 121312 RRA
FFWMFD
OHC033-083-117-121600-

BULLETIN - EBS ACTIVATION REQUESTED
SMALL STREAM AND URBAN FLOOD WARNING
NATIONAL WEATHER SERVICE MANSFIELD OH
910 AM EDT THU JUL 12 1990

THE NATIONAL WEATHER SERVICE IN MANSFIELD HAS ISSUED A
SMALL STREAM AND URBAN FLOOD WARNING EFFECTIVE UNTIL 12 NOON EDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTH CENTRAL OHIO
         ...CRAWFORD...KNOX...MORROW...                    

STEADY RAIN CONTINUED OVER THE CENTRAL HIGHLANDS AND NUMEROUS REPORTS
OF WATER PONDING AND COVERING ROADS HAVE BEEN RECIEVED. THE SANDUSKY
RIVER IN BUCYRUS IS OUT OF ITS BANKS. THE STEADY RAIN WILL LIKELY
CAUSE OTHER CREEKS AND STREAMS TO FLOOD.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

BANYAS

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 12, 4:47 AM EDT, 4 hours 23 minutes before
OHZ008-INZ013-KYZ005-121000-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CINCINNATI OH
446 AM EDT THU JUL 12 1990

THUNDERSTORMS WITH HEAVY RAIN AND SMALL HAIL WERE CROSSING THE TRISTATE
THIS MORNING.

AT 430 AM WEATHER SERVICE RADAR SHOWED A LARGE AREA OF RAIN WITH IMBEDDED
THUNDERSTORMS OVER WESTERN OHIO...CENTRAL AND SOUTHERN INDIANA.

THE HEAVIEST OF THE RAIN WAS FROM VERSAILLES INDIANA TO CORINTH KENTUCKY OR
ABOUT 25 MILES SOUTH AND WEST OF CINCINNATI OHIO.

MOVEMENT OF THE RAIN WAS TO THE EAST AT 25 MILES AN HOUR.

THESE THUNDERSTORMS WILL PRODUCE HEAVY DOWNPOURS AND POSSILE HAIL AS
THEY CROSS THE TRISTATE AREA THIS MORNING. AMOUNTS OF ONE TO TWO INCHES
OF RAIN ARE ALSO POSSIBLE.

IF YOU ARE OUT DRIVING THIS MORNING AND ENCOUNTER ANY STANDING OR
FLOWING WATER ACROSS STREETS OR ROADS...PLEASE AVOID THEM AND MOVE
TO HIGHER GROUND.

A FLOOD WATCH REMAINS IN EFFECT FOR ALL OF SOUTHWESTERN OHIO FOR T~HE
REST OF THIS MORNING.

MANUEL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 10:50 PM EDTFlash Flood WarningILNMontgomery, Preble3 hr
Jul 11, 10:50 PM EDTFlash Flood WarningILNClark3 hr
Jul 12, 12:01 AM EDTFlash Flood WarningILNAshland119 min
Jul 12, 5:21 AM EDTFlash Flood WarningILNAshland3 hr
Jul 12, 5:30 AM EDTFlash Flood WarningILNCrawford, Richland3 hr
Jul 12, 8:30 AM EDTFlash Flood WarningILNAshland, Richland2 hr
Jul 12, 9:10 AM EDTFlash Flood WarningILNCrawford, Morrow3 hr
Jul 12, 10:20 AM EDTFlash Flood WarningILNAshland, Crawford, Knox, Morrow, Richland5 hr
Jul 12, 10:29 AM EDTFlash Flood WarningILNGreene3 hr

Nearby

Flash Flood Warnings in Ohio, 1990Every flash flood 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; the sounding from the Mesonet's radiosonde archive.