Alert archive / Ohio / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 13, NWS Wilmington, OH

April 9, 1999Champaign County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Apr 9, 1999, 5:36 AM EDT for Champaign County, Ohio. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 9, 1999, 5:36 AM EDT (09:36 UTC)
Expired: Apr 9, 1999, 6:25 AM EDT
In force: 49 min
Issued by: NWS Wilmington, OH
Area: Whole counties

County Champaign County, OH

What was reported inside it

Time	Report	Where	Remark
Apr 9, 6:00 AM EDT	Tornado F1	Middletown, OH	The tornado caused structural damage to houses and mobile homes, as well as downing several trees.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 3:00 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 9.6 hours before the alert went out and 79 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: 250 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1483 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

999 
WUUS01 KILN 090938 RRA
SVRILN
OHC021-091025-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
536 AM EDT FRI APR 9 1999

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHAMPAIGN COUNTY IN WEST CENTRAL OHIO.

* UNTIL 625 AM EDT

* AT 535 AM EDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 3
  MILES NORTHWEST OF URBANA... MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  URBANA AT 540 AM EDT .
  KENNARD AT 544 AM EDT .
  CABLE AT 547 AM EDT .
  NORTH LEWISBURG AT 555 AM EDT .

GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS A TORNADO
WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO
PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

.END/TIPTON

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Apr 8, 9:25 PM EDT, 8 hours 11 minutes earlier.

Area forecast discussion, Apr 8, 9:25 PM EDT, 8 hours 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
925 PM EDT THU APR 8 1999

WARM FRONT CURRENTLY LOCATED FROM IA/MO BORDER TO LAF TO HERE AT
ILN.  00Z SNDG SHOWED LI/S -4 AND CAPE OF ABOUT 900 J/KG.  MODIFIED
SNDG TO INCREASE SFC DWPT AND SLIGHTLY DECREASE SFC TEMP WHICH KEPT
LI THE SAME AND INCREASED CAPE TO OVER 1100 J/KG.  HELICITES WERE
LESS THAN 100 BUT THOSE SHUD INCREASE A LITTLE AS LOW APPROACHES.

LINE PUSHING INTO IL SHUD HOLD TOGETHER AND IF IT MAINTAINS CURRENT
MOVEMENT...IT WILL MOVE INTO CWA ARND 07Z.  THE STRONGEST STORMS
WILL LIKELY CONT TO KEEP NEAR THE TRIPLE PT WHICH WOULD BRING THEM
INTO SE IN AND SW OH AFTER MID.  WITH CURRENT AND FCST PARAMETERS
THINK WIND WILL BE THE GREATEST DANGER BUT SOME LARGE HAIL WITH THE
STRONGEST STORMS IS NOT OUT OF THE QUESTION.

LATEST 94O HAS SE IN AND SW OH IN MOD RISK WITH REST OF AREA IN
SLT.  NOT AS CONCERNED WITH SVR IN THE ERN AREAS BUT WILL CERTAINLY
LEAVE WORDING AS IS.

AS FOR TEMPS WILL LEAVE THINGS ALONE AS TEMPS WILL COOL WITH THE
RAIN.  WARM FRONT SHUD MAKE IT TO ARND I-70 SO WILL LEAVE THE NORTH
A LITTLE COOLER AS DWPTS WILL BE LOWER.

.ILN...NONE

WHITE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 4:52 AM EDT	Tornado Warning	ILN	Hamilton	63 min
Apr 9, 5:18 AM EDT	Severe Thunderstorm Warning	ILN	Clermont	47 min
Apr 9, 5:19 AM EDT	Tornado Warning	ILN	Warren	61 min
Apr 9, 5:41 AM EDT	Tornado Warning	ILN	Clinton	49 min
Apr 9, 5:51 AM EDT	Severe Thunderstorm Warning	ILN	Union	49 min
Apr 9, 7:16 AM EDT	Severe Thunderstorm Warning	ILN	Fairfield, Licking	49 min
Apr 9, 11:26 AM EDT	Severe Thunderstorm Warning	ILN	Greene	34 min
Apr 9, 11:50 AM EDT	Severe Thunderstorm Warning	ILN	Madison	45 min
Apr 9, 11:55 AM EDT	Severe Thunderstorm Warning	ILN	Franklin	65 min
Apr 9, 12:28 PM EDT	Severe Thunderstorm Warning	ILN	Licking	62 min

Nearby

Severe Thunderstorm Warnings in Ohio, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.