Alert archive / Ohio / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 57, NWS Wilmington, OH

May 12, 2002Clark County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at May 12, 2002, 11:22 AM EDT for Clark County, Ohio. It was in force for 38 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: May 12, 2002, 11:22 AM EDT (15:22 UTC)
Expired: May 12, 2002, 12:00 PM EDT
In force: 38 min
Issued by: NWS Wilmington, OH
Area: Whole counties

County Clark County, OH

The radar

The Cincinnati radar (KILN), 55 km from the middle of the area, began a volume at 15:23 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
May 12, 11:45 AM EDT	Thunderstorm Wind 50 E	Springfield, OH	Several trees were knocked down across the city.

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
May 12, 10:45 AM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 3.4 hours before the alert went out and 54 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: 1215 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 837 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 314 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 9.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KILN 121522
SVRILN
OHC023-121600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
1122 AM EDT SUN MAY 12 2002

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

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

* UNTIL NOON EDT...

* AT 1122 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES SOUTHWEST OF SPRINGFIELD...MOVING EAST
  AT 40 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  SOUTH CHARLESTON...
  SPRINGFIELD...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

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 May 12, 10:28 AM EDT, 54 minutes earlier.

Area forecast discussion, May 12, 10:28 AM EDT, 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
1028 AM EDT SUN MAY 12 2002

12Z SURFACE ANALYSIS HAD WARM FRONT RUNNING FROM NEAR FDY-N MFD-S
YNG.  SURFACE LOW WAS OVER NW IL.  MORNING SOUNDING PRETTY
UNSTABLE...WITH CAPES OVER 100 ALREADY AND LI NEAR -4.

NEED TO UPDATE ZONES.  MID TO HIGH CLOUDS AHEAD OF CONVECTION ARE
PROVIDING CLOUDY SKIES.  IN ADDITION...CONVECTION IS ALREADY AFFECT
THE NORTHWEST QUARTER OF THE FA.  WILL NEED TO UPDATE WORDING AND
POPS.  THIS WILL APPLY TO CENTRAL OHIO ALSO.

FARTHER SOUTH...WILL SPLIT OHIO AND KY COUNTIES.  NOT A LOT OF PUSH
AT THIS TIME ON THE SOUTH EDGE...SO WILL INCREASE POPS FOR OHIO TO
CATEGORICAL...AND WILL ADJUST TIMING IN KENTUCKY.

WILL WAIT FOR SPC WATCH BEFORE ISSUING MISILN.

.ILN...

IN...FLOOD WATCH FOR SUNDAY NIGHT AND MONDAY FOR ZONES INZ073>075...
INZ080.

KY...FLOOD WATCH FOR SUNDAY NIGHT AND MONDAY FOR ZONES KYZ089>100.

OH...FLOOD WATCH FOR SUNDAY NIGHT AND MONDAY FOR ZONES OHZ070>074...
OHZ077>082...OHZ088.

SITES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 11:09 AM EDT	Severe Thunderstorm Warning	ILN	Champaign, Union	51 min
May 12, 11:27 AM EDT	Severe Thunderstorm Warning	ILN	Greene	33 min
May 12, 11:31 AM EDT	Severe Thunderstorm Warning	ILN	Delaware, Franklin	59 min
May 12, 11:36 AM EDT	Severe Thunderstorm Warning	ILN	Warren	24 min
May 12, 11:41 AM EDT	Severe Thunderstorm Warning	ILN	Madison	49 min
May 12, 12:01 PM EDT	Severe Thunderstorm Warning	ILN	Licking	44 min
May 12, 12:04 PM EDT	Severe Thunderstorm Warning	ILN	Clinton	26 min
May 12, 12:32 PM EDT	Severe Thunderstorm Warning	ILN	Pickaway	28 min
May 12, 1:15 PM EDT	Severe Thunderstorm Warning	ILN	Fairfield, Hocking	30 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.