Alert archive / Ohio / Flash Flood Warnings in 1998

Flash Flood Warning 12, NWS Wilmington, OH

April 9, 1998Shelby County, Ohio

NWS Wilmington, OH issued this flash flood warning at Apr 9, 1998, 5:49 AM EDT for Shelby County, Ohio. It was in force for 116 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 9, 1998, 5:49 AM EDT (09:49 UTC)
Expired
Apr 9, 1998, 7:45 AM EDT
In force
116 min
Issued by
NWS Wilmington, OH
Area
Whole counties

County Shelby County, OH

The radar

The Cincinnati radar (KILN), 107 km from the middle of the area, began a volume at 09:53 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 9.8 hours before the alert went out and 106 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, Cncnati-Daytn, OH at 00:00Z on 1998-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 149 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, Cncnati-Daytn, OH at 00:00Z on 1998-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.1939587897117136156Sfc1 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
149 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
1572 m above ground
0-6 km bulk shear
85 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KILN 090949
FFWILN
OHC149-091145-

BULLETIN
FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
549 AM EDT THU APR 9 1998

THE NATIONAL WEATHER SERVICE IN WILMINGTON OH HAS ISSUED A
FLOOD WARNING FOR SMALL STREAMS EFFECTIVE UNTIL 745 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN WEST CENTRAL OHIO

   ...SHELBY COUNTY
 
AT 545 AM EDT NATIONAL WEATHER SERVICE RADAR INDICATED AN AREA OF
VERY HEAVY SHOWERS AND THUNDERSTORMS HEADING NORTH TOWARD SHELBY
COUNTY.   FROM 1 TO 2 INCHES OF RAINFALL CAN BE EXPECTED FROM THESE
STORMS.

PARTS OF NORTHERN AND CENTRAL SHELBY COUNTY RECEIVED AN ESTIMATED 2
TO 4 INCHES OF RAIN ON WEDNESDAY EVENING.  NUMEROUS ROADS WERE
REPORTED TO BE FLOODED EARLIER IN THE NIGHT.

THIS NEXT AREA OF RAINFALL MAY CAUSE FURTHER FLOODING OF COUNTY
CREEKS AND STREAMS.

RESIDENTS AND MOTORISTS IN SHELBY COUNTY SHOULD KEEP AN EYE ON AREA
CREEKS AND STREAMS EARLY THIS MORNING.
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER CJOVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
QUICKLY.  MOVE TO HIGHER GROUND.

WILKINSON

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.

NWS Wilmington, OH wrote its last area forecast discussion before this flash flood warning went out at Apr 9, 3:06 AM EDT, 2 hours 43 minutes earlier.

Area forecast discussion, Apr 9, 3:06 AM EDT, 2 hours 43 minutes before
FORECAST COORDINATION MESSAGE
NATIONAL WEATHER SERVICE WILMINGTON OH
306 AM EDT THU APR 9 1998

06Z SFC ANALYSIS INDICATED LOW PRES OVR CNTRL IN WITH PRESSURE FALLS
INDICATING THE DEVELOPING LOW OVR KY.  MODELS INDICATE THAT THE KY LOW
WL BECOME THE MAIN LOW BY 12Z AND TRACK INTO S-CNTRL OH.   KILN 88D
SHOWS A DIVERGING PRECIP PATTERN INDICATING STRONG UPPER DIVERGENCE AND
LIFT.  THE DRY AREA IN THE PRECIP WAS BEGINNING TO FILL IN OVER THE LAST
FEW SCANS SO XPCT MORE PRECIP TO MOVE INTO SRN FA THROUGH DAYBREAK.

MODELS BRING H5 VORT INTO FA DURING THE MORNING HOURS.  A DECREASE IN
MEAN RH IS PROGD OVR SRN FA SO PRECIP MAY DECREASE IN COVERAGE THERE
THIS AM.  HOWEVER...LOOKS LIKE A WASH OUT FOR NRN FA WITH -SHRA AND CHC
TSRA ALL DAY.  MODEL PRECIP EFFICIENCY AND MEAN RH INDICATE BY THE LATE
PM PRECIP WL PUSH BACK TOWARD THE SRN FA.  THUS...SUGGEST CAT POPS
DAY-CMH AND SWD TO THE OH RIVER.  MAY BE ABLE TO LWR TO LIKELY OVR NRN
KY.

PRECIP WL CONTINUE OVERNIGHT AS A TROF DROPS SWD ACROSS FA.  SHOULD BE
ABLE TO KEEP THUNDER OUT TONIGHT XCPT FOR PMH-CVG.

TEMPS WL BE MUCH COOLER TODAY AS FA SHIFTS TO THE BACKSIDE OF THE LOW.
MOS GUIDANCE LOOKS REASONABLE.

WILKINSON

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 10:25 PM EDTSevere Thunderstorm WarningILNLogan30 min
Apr 8, 10:46 PM EDTSevere Thunderstorm WarningILNHardin54 min
Apr 9, 12:33 AM EDTFlash Flood WarningILNLogan, Shelby117 min
Apr 9, 6:41 AM EDTFlash Flood WarningILNLogan119 min

Nearby

Flash Flood Warnings in Ohio, 1998Every flash flood warning in 1998

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; radar from the NEXRAD Level II archive.