Alert archive / Ohio / Flash Flood Warnings in 1998

Flash Flood Warning 42, NWS Wilmington, OH

May 20, 1998Hamilton County, Ohio

NWS Wilmington, OH issued this flash flood warning at May 20, 1998, 1:08 AM EDT for Hamilton 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: May 20, 1998, 1:08 AM EDT (05:08 UTC)
Expired: May 20, 1998, 3:10 AM EDT
In force: 2 hr
Issued by: NWS Wilmington, OH
Area: Whole counties

County Hamilton County, OH

The radar

The Cincinnati radar (KILN), 67 km from the middle of the area, began a volume at 05:12 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, 5.1 hours before the alert went out and 69 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1270 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1675 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KILN 200510
FFWILN
OHC061-200710-

BULLETIN
FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
108 AM EDT WED MAY 20 1998

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS FOR...
  HAMILTON COUNTY IN SOUTHWESTERN OHIO.

* EFFECTIVE UNTIL 310 AM EDT.

*DOPPLER RADAR INDICATED THAT UP TO AN INCH AND A HALF OF RAIN FELL
OVER NORTHEAST HAMILTON COUNTY BETWEEN MIDNIGHT AND 1 AM. REPORTS
HAVE BEEN RECEIVED THAT CRESCENTVILLE ROAD WAS UNDER A FOOT TO 2
FEET OF WATER IN PLACES. PERSONS IN THE AREA SHOULD USE EXTREME
CAUTION IF DRIVING.
*

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
ACT QUICKLY.

FARINA

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 May 19, 9:07 PM EDT, 4 hours 1 minute earlier.

Area forecast discussion, May 19, 9:07 PM EDT, 4 hours 1 minute before

FORECAST COORDINATION MESSAGE
NATIONAL WEATHER SERVICE WILMINGTON OH
907 PM EDT TUE MAY 19 1998

MCS MUCH LARGER THAN IOWA WAS ACROSS THE OH VLY THIS EVENING.  A FEW
LARGE HAIL REPORTS HAVE BEEN RECEIVED SO FAR IN CWA.  AREA 88DS INDICATE
NMRS TSRA OVER IN WHICH WERE MOVG E AND SEWD TOWARD FA.  KILN 00Z
SOUNDING INDICATES THAT WIND DAMAGE COULD BECOME A THREAT AS WELL.
CURRENT FCSTS LOOK GOOD.

WILKINSON

In the hours before

Special weather statement, May 19, 8:19 PM EDT, 4 hours 49 minutes before

OHZ015-016-024>026-034-035-042>046-051>056-060>065-070>074-080-INZ
050-058-059-200500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
819 PM EDT TUE MAY 19 1998

....A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 100 AM EDT (1200
AM EST) FOR WESTERN AND CENTRAL OHIO AND EAST-CENTRAL INDIANA...

ALSO...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 100 AM EDT
(1200 AM EST) FOR RIPLEY COUNTY INDIANA...

SCATTERED THUNDERSTORMS WIVTH A HISTORY OF PRODUCING LARGE HAIL AND
DAMAGING WINDS WILL AFFECT THE WATCH AREA THROUGH THE EVENING HOURS.

RESIDENTS OF THE WATCH AREA SHOULD KEEP AN EYE TO THE SKY AND STAY
TUNED TO NOAA WEATHER RADIO.

WILKINSON

Local storm report, May 19, 9:48 PM EDT, 3 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OHIO
948 PM EDT TUE MAY 19 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0939 PM    SPRINGFIELD               OH   .75 INCH HAIL
05/19/98   CLARK

Local storm report, May 19, 11:20 PM EDT, 1 hour 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OHIO
1120 PM EDT TUE MAY 19 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0753 PM    WAYNESFIELD               OH   .75 INCH HAIL
05/19/98   AUGLAIZE                       DIME SIZE HAIL

0920 PM    ROSSBURG                  OH   .75 INCH HAIL
05/19/98   DARKE                          DIME SIZE HAIL

0920 PM    ROSSBURG                  OH   WIND DAMAGE
05/19/98   DARKE                          POLES SNAPPED OFF AND
                                          KNOCKED DOWN

Local storm report, May 20, 12:34 AM EDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OHIO
1234 AM EDT WED MAY 20 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1215 AM    BATAVIA                   OH   WIND DAMAGE
05/20/98   CLERMONT                       TREES DOWN

1220 AM    MT ORAB                   OH   WIND DAMAGE
05/20/98   BROWN                          TREES AND POWER LINES DOWN
                                          ALONG ROUTE 68

Special weather statement, May 20, 1:05 AM EDT, 3 minutes before

OHZ042>046-051>056-060>065-070>074-200600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
105 AM EDT WED MAY 20 1998

...SEVERE THUNDERSTORM WATCH FOR PARTS OF WESTERN...SOUTHERN AND
   CENTRAL OHIO HAS EXPIRED...

THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR THE REGION...
INCLUDING AREAS AROUND DAYTON...BELLEFONTAINE AND COLUMBUS...EXPIRED
AT 1 AM EDT.

SHOWERS AND OCCASIONAL THUNDERSTORMS WILL CONTINUE ACROSS THE REGION
OVERNIGHT. ALTHOUGH STRONG WIND GUSTS AND HAIL MAY STILL OCCUR IN A
FEW LOCATIONS...MOST THUNDERSTORMS WILL PRODUCE VERY HEAVY DOWNPOURS
AND FREQUENT LIGHTNING...AND THE THREAT FOR WIDESPREAD SEVERE WEATHER
HAS ENDED.

ROWLEY

Special weather statement, May 20, 1:05 AM EDT, 3 minutes before

OHZ042>046-051>056-060>065-070>074-200600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
105 AM EDT WED MAY 20 1998

...SEVERE THUNDERSTORM WATCH FOR PARTS OF WESTERN...SOUTHERN AND
   CENTRAL OHIO HAS EXPIRED...

THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR THE REGION...
INCLUDING AREAS AROUND DAYTON...BELLEFONTAINE AND COLUMBUS...EXPIRED
AT 1 AM EDT.

SHOWERS AND OCCASIONAL THUNDERSTORMS WILL CONTINUE ACROSS THE REGION
OVERNIGHT. ALTHOUGH STRONG WIND GUSTS AND HAIL MAY STILL OCCUR IN A
FEW LOCATIONS...MOST THUNDERSTORMS WILL PRODUCE VERY HEAVY DOWNPOURS
AND FREQUENT LIGHTNING...AND THE THREAT FOR WIDESPREAD SEVERE WEATHER
HAS ENDED.

ROWLEY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 8:00 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize	60 min
May 19, 8:08 PM EDT	Severe Thunderstorm Warning	ILN	Hardin	57 min
May 19, 8:54 PM EDT	Severe Thunderstorm Warning	ILN	Darke	56 min
May 19, 9:13 PM EDT	Severe Thunderstorm Warning	ILN	Clark	62 min
May 19, 10:09 PM EDT	Severe Thunderstorm Warning	ILN	Greene	51 min
May 19, 11:51 PM EDT	Severe Thunderstorm Warning	ILN	Clermont	59 min
May 20, 12:15 AM EDT	Severe Thunderstorm Warning	ILN	Brown	60 min

Nearby

Flash Flood Warnings in Ohio, 1998 Every 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.