Alert archive / Ohio / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 7, NWS Wilmington, OH

February 20, 2002Clinton County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Feb 20, 2002, 1:43 PM EST for Clinton County, Ohio. It was in force for 47 min. 2 reports 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: Feb 20, 2002, 1:43 PM EST (18:43 UTC)
Expired: Feb 20, 2002, 2:30 PM EST
In force: 47 min
Issued by: NWS Wilmington, OH
Area: Whole counties

County Clinton County, OH

The radar

The Cincinnati radar (KILN), 1 km from the middle of the area, began a volume at 18:43 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.

What was reported inside it

Time	Report	Where	Remark
Feb 20, 2:05 PM EST	Hail 1	Martinsville, OH
Feb 20, 2:40 PM EST	Hail 0.75	Wilmington, OH

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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 6.7 hours before the alert went out and 2 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 543 m²/s²
0-3 km storm-relative helicity: 583 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 
WUUS51 KILN 201843
SVRILN
OHC027-201930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
142 PM EST WED FEB 20 2002

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLINTON COUNTY IN OHIO...

* UNTIL 230 PM EST...

* AT 142 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 13 MILES SOUTHWEST OF NEW VIENNA...OR ABOUT 6
  MILES SOUTHEAST OF BLANCHESTER...MOVING NORTHEAST AT 20 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  NEW VIENNA...

THIS IS A DANGEROUS STORM...CAPABLE OF PRODUCING VERY LARGE HAIL AND
DAMAGING WINDS. IF YOU ARE IN THE STORMS PATH...TAKE COVER IN A
STURDY STRUCTURE UNTIL THE STORM PASSES.

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 Feb 20, 9:45 AM EST, 3 hours 58 minutes earlier.

Area forecast discussion, Feb 20, 9:45 AM EST, 3 hours 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
945 AM EST WED FEB 20 2002

FCST UPDATE THIS MORNING CONCERNS POTENTIAL FOR SVR WX.

14Z SFC ANALYSIS DEPICTED A COLD FRONT ACRS CNTRL IL SOUTHWARD ALONG
THE MS RIVER VLY.  MODELS TAKE THIS FRONT AND ASSOCIATED UPR LVL S/W
TO NEAR THE OHIO/INDIANA BORDER BY EARLY AFTN (18Z-20Z PERIOD).  WITH
DYNAMICAL S/WV...SFC FRONT...MID LVL DRYING...DEWPOINTS IN THE LOWER
50S AND AIR TEMPS PUSHING 60 DEGREES...FCST MODEL SOUNDINGS YIELD
SBCAPES 500-1000 J/KG.  THIS UNSTABLE AIR ALONG WITH MID LVL WINDS
NEAR 80 KT POSES THE POTENTIAL FOR THUNDERSTORMS WHICH MAY CONTAIN
DAMAGING WINDS.  RADAR AND SATELLITE MOSAICS ALREADY SHOW CONVECTION
DEVELOPING ACRS EXTREME ERN ILLINOIS ATTM.  WILL UPDATE FCST TO
INCLUDE POSSIBLE STRONG WINDS ALL ZONES AND TO CLEAN UP WORDING.
OTHERWISE FCST LOOKS GOOD.

.ILN...NONE.

HICKMAN

In the hours before

Special weather statement, Feb 20, 11:46 AM EST, 1 hour 57 minutes before

INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046-
051>056-060>065-070>074-077>082-088-202300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WILMINGTON OH
1146 AM EST WED FEB 20 2002

...THUNDERSTORMS WITH GUSTY WINDS LIKELY THIS AFTERNOON...

A LOW PRESSURE SYSTEM WILL MOVE ACROSS MICHIGAN TODAY. AN
ASSOCIATED COLD FRONT WILL PUSH ACROSS THE OHIO VALLEY LATER THIS
AFTERNOON. SHOWERS AND THUNDERSTORMS AHEAD OF THE COLD FRONT WILL
AFFECT THE REGION DURING THE AFTERNOON HOURS.

WINDS ABOVE THE SURFACE WILL BE QUITE STRONG...SO ANY SHOWERS AND
STORMS WHICH DEVELOP WILL BE CAPABLE OF PRODUCING VERY GUSTY WINDS.
THE POTENTIAL EXISTS FOR A FEW OF THE THUNDERSTORMS TO BECOME
SEVERE...WITH DAMAGING WINDS THE PRIMARY SEVERE WEATHER THREAT. SMALL
HAIL CAN ALSO BE EXPECTED WITH SOME OF THE STRONGER STORMS.

THE STORM PREDICTION CENTER HAS PLACED THE ENTIRE AREA IN A SLIGHT
RISK FOR SEVERE THUNDERSTORMS TODAY.  SPOTTER ACTIVATION MAY BE
REQUIRED THIS AFTERNOON OVER PARTS OF THE REGION...SO STAY TUNED TO
NOAA WEATHER RADIO OR THE COMMERCIAL MEDIA FOR THE LATEST
INFORMATION.

Local storm report, Feb 20, 1:06 PM EST, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON, OH
106 PM EST WED FEB 20 2002

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

1245 PM    VEVAY                     IN   1.00 INCH HAIL
02/20/02   SWITZERLAND

SFH

Local storm report, Feb 20, 1:18 PM EST, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON, OH
118 PM EST WED FEB 20 2002

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

0115 PM    FLORENCE                  KY   1.50 INCH HAIL
02/20/02   BOONE

SFH

Local storm report, Feb 20, 1:33 PM EST, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON, OH
133 PM EST WED FEB 20 2002

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

0124 PM    EDGEWOOD                  KY   1.75 INCH HAIL
02/20/02   KENTON

SFH

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 1:35 PM EST	Severe Thunderstorm Warning	ILN	Hamilton	40 min
Feb 20, 1:48 PM EST	Severe Thunderstorm Warning	ILN	Clermont	27 min
Feb 20, 2:03 PM EST	Severe Thunderstorm Warning	ILN	Warren	27 min
Feb 20, 2:08 PM EST	Severe Thunderstorm Warning	ILN	Fayette	37 min
Feb 20, 2:27 PM EST	Severe Thunderstorm Warning	ILN	Clinton	33 min
Feb 20, 2:40 PM EST	Severe Thunderstorm Warning	ILN	Franklin	35 min
Feb 20, 2:51 PM EST	Severe Thunderstorm Warning	ILN	Pickaway, Ross	54 min

Nearby

Severe Thunderstorm Warnings in Ohio, 2002 Every severe thunderstorm warning in 2002

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; radar from the NEXRAD Level II archive.