Alert archive / Ohio / Flash Flood Warnings in 1998

Flash Flood Warning 4, NWS Wilmington, OH

January 7, 1998Hocking County, Ohio

NWS Wilmington, OH issued this flash flood warning at Jan 7, 1998, 8:20 PM EST for Hocking County, Ohio. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jan 7, 1998, 8:20 PM EST (01:20 UTC)
Expired
Jan 7, 1998, 10:20 PM EST
In force
2 hr
Issued by
NWS Wilmington, OH
Area
Whole counties

County Hocking County, OH

The radar

The Cincinnati radar (KILN), 116 km from the middle of the area, began a volume at 01:22 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, 1.3 hours before the alert went out and 114 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 1998-01-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 35 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 1998-01-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
35 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
526 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
126 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 KILN 080121
FFWILN
OHC073-080320-

BULLETIN
FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
820 PM EST WED JAN 7 1998

THE NATIONAL WEATHER SERVICE IN WILMINGTON OH HAS ISSUED A
FLOOD WARNING FOR SMALL STREAMS EFFECTIVE UNTIL 1020 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN CENTRAL OHIO

   ...HOCKING COUNTY
 
AN ESTIMATED ONE TO TWO AND A HALF INCHES OF RAIN HAS FALLEN ACROSS
HOCKING COUNTY. COUNTY OFFICIALS HAVE REPORTED SOME ROADS CLOSED
DUE TO HIGH WATER AND STREAMS OUT OF THEIR BANKS. ADDITIONAL
AMOUNTS OF A HALF AN INCH TO ONE INCH OF RAIN WILL CAUSE FLOODING
OF ROADS AND STREAMS.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODING.

DO NOT 2DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS 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.


PADGETT

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 Jan 7, 3:00 PM EST, 5 hours 20 minutes earlier.

Area forecast discussion, Jan 7, 3:00 PM EST, 5 hours 20 minutes before
FORECAST COORDINATION MESSAGE
NATIONAL WEATHER SERVICE WILMINGTON OH
300 PM EST WED JAN 7 1998

PRIMARY CONCERN IS FLASH FLOOD/FLOOD THREAT OVERNIGHT.  NGM AND AVN
DOING BETTER THAN ETA WITH MOISTURE FIELDS AND AXIS OF HEAVIEST RAIN.
NGM SHOWED AXIS OF HEAVY RAIN ALONG I-71 AT 00Z.  ATTM...REGIONAL RADARS
SHOW THE LAST SLUG OF DEEP MOISTURE (MOD-HEAVY RA) FM SC KY INTO CNTRL
TN.  AT 00Z NGM SHOWS LOADS OF 850 MB MOISTURE CONVERGENCE IN N KY AND
SRN OH WITH THE NOSE OF THE 50+ KT LOW LVL JET IN THIS SAME AREA.  THE
JET...MOISTURE CONVERGENCE AND UVV MOVE OFF QUICKLY TO THE NE LTR TNGT.
MODEL TIME SECTION ALSO SHOWS OUR AREA LOSING THE DEEP MOISTURE BY
AROUND 06Z TNGT.  THUS...GREATEST ACCUM RAIN TO OCCUR TIL AROUND 12 AM
FOLLOWED BY SCT LESS INTENSE RAIN.  BEWARE...ILN RADAR HAS BEEN
UNDERESTIMATG RAINFALL.  AT 18Z THE RADAR SHOWED ABOUT .25 IN NR CVG
WHILE CVG GAUGE HAD PICKED UP .76 INCHES.  ANOTHER REPORT FM BUTLER
COUNTY ALSO CONFIRMED THE UNDERESTIMATG.  IF PCPN BECOMES MORE
CONVECTIVE LT AFTN AND EVENG THE ESTIMATG WL GET BETTER BUT EVENT WL
STILL BE UNDERDONE BY RADAR.  ALREADY HAVE HAD A COUPLE RPTS OF PNDG
WTR ON ROADS IN SRN OH.  USING CURRENT RADAR AND FCST MODEL BELIEVE THE
PLUME OF HEAVIEST RAIN ACROSS OUR AREA WL BE ROUGHLY ALONG I-71 TO THE
S AND E WITH AMOUNTS DROPPG OFF TOWARD LIMA.  BIG QUESTION IS WHAT TO
DO WITH FF/FLOOD WATCHES.  BELIEVE CVG...DAY AND CMH AREAS SHOULD
CONTINUE IN WATCH TNGT.  LESS CHC EC IN INTO WC OH AND WL COORD WITH
WSFO'S ON THAT AREA.  COULD SEE AN ADDITIONAL 1-2 INCHES OF RAIN IN
PRIME AREA AND 6 HR FFG ONLY 1-1.5 INCHES WITH 12 HR BETWEEN 1.5 AND 2
INCHES MOST AREAS.

PSUEDO DRY SLOT TO COME IN LTR TNGT AND REMAIN NRBY INTO THU.  ALTHOUGH
DEEP MOISTURE GONE THERE WL STILL BE LOW LVL MOISTURE AND WEAK IMPULSES
BEFORE STGR VORT MOVES IN THU NGT.  700 MB TROF DOES NOT MOVE THRU TIL
FRI AS WELL SO WL KEEP RELATIVELY HIGH POPS FOR THE REST OF THE FCST
BUT THE QPF WL BE MINOR COMPARED TO THIS EVENG. TEMPS WL BE TUF AS FNTL
BNDRY HUNG UP IN THE MIDDLE OF OUR FA THRU THU BEFORE MOVG E ON FRI.
TEMPS RANGE ATTM FM 45 FWA TO 60 AT HTS.  THE TIGHT TEMP GRADIENT IS
ACROSS THE MIAMI VLY AND WC OH. DAY HAS JUST PLUMMETED 6 DEG F TO 52
DEG F IN LESS THAN AN HR.  BNDRY SHOULD STILL CREEP A LITTLE FARTHER S
AND E TNGT.

DID NOT DEPART FAR FM MOS WITH UNCERTAINTY ABOUT EXACT BNDRY POSITION.

CVG 52/54/41/42  +/6/6/4
DAY 47/48/39/39  +/6/6/5
CMH 50/53/44/44  +/7/7</6

SANDLER

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 7, 8:50 PM ESTFlash Flood WarningILNPike100 min
Jan 7, 10:35 PM ESTFlash Flood WarningILNHocking115 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.