Alert archive / Ohio / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 92, NWS Wilmington, OH

July 9, 1999Hardin County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Jul 9, 1999, 5:01 PM EDT for Hardin County, Ohio. It was in force for 44 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: Jul 9, 1999, 5:01 PM EDT (21:01 UTC)
Expired: Jul 9, 1999, 5:45 PM EDT
In force: 44 min
Issued by: NWS Wilmington, OH
Area: Whole counties

County Hardin County, OH

The radar

The Cincinnati radar (KILN), 139 km from the middle of the area, began a volume at 21:01 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
Jul 9, 5:20 PM EDT	Thunderstorm Wind 60	Ada, OH	A television tower was blown over, a roof damaged, and trees and power poles were downed.

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, 9.0 hours before the alert went out and 138 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: 1992 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jul 9, 3:42 PM EDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 9, 3:42 PM EDT, 1 hour 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
342 PM EDT FRI JUL 9 1999

CLEMISILN ALREADY OUT.

NGM AND ETA ARE SIMILAR THIS RUN ON TIMING OF COLD FRONT DROPPING
ACROSS FA AND 300 JET MAX.

NGM DEWPOINTS WERE UNDER DONE AGAIN THIS RUN...PLACING 60 DEWPOINTS
WERE 70 WERE OBSERVED. THEREFORE NGM CAPES AND INSTABILITIES ARE WAY
UNDERESTIMATED.

MEANWHILE ETA IS THE ONLY MODEL WHICH HAS THE TAIL OF THE 850 MB JET
MAX ACROSS WV INTO KY.  WITH THIS JET...THE ETA PRODUCES A STRONG
850 CONVERGENT AREA AND COMBINES IT WITH THE UPPER LEVEL DIVERGENCE
TO PRODUCE A WIDE AREA OF UPPER VELOCITIES.

THINK THAT THE ETA MIGHT BE A LITTLE TO AGGRESSIVE WITH THE 850
WINDS...SO WILL TREND TOWARDS THE ETA SOLUTION...POSITION OF THE
QPF...BUT WILL TAPER IT DOWN A LITTLE.

WILL CONTINUE WITH LIKELY POPS IN THE WEST...BUT WILL GO HIGH CHANCE
IN THE EAST...WHERE THE FORCING IS A LITTLE WEAKER.

FRONT IS LOCATED FROM SOUTH OF CMH-DAY BY 12Z SATURDAY...SO WILL
CONTINUE WITH THE POPS IN THE SOUTHERN COUNTIES.  DRY AIR PUSHES IN
FOR SATURDAY NIGHT AND SUNDAY.

NGM MOS TEMPERATURES IN THE BALLPARK FOR THE FIRST 3 PERIODS...BUT A
LOOK LITTLE WARM FOR SUNDAY...CONSIDERING THAT THE THE 850
TEMPERATURES WILL BE ABOUT 10 C.

.ILN...NONE

SITES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:00 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Shelby	35 min
Jul 9, 6:34 PM EDT	Severe Thunderstorm Warning	ILN	Champaign	61 min
Jul 9, 6:58 PM EDT	Tornado Warning	ILN	Miami	32 min
Jul 9, 7:04 PM EDT	Severe Thunderstorm Warning	ILN	Montgomery, Preble	66 min
Jul 9, 7:14 PM EDT	Severe Thunderstorm Warning	ILN	Union	46 min
Jul 9, 7:31 PM EDT	Severe Thunderstorm Warning	ILN	Clark	59 min
Jul 9, 7:44 PM EDT	Severe Thunderstorm Warning	ILN	Franklin	66 min
Jul 9, 7:51 PM EDT	Severe Thunderstorm Warning	ILN	Licking	64 min
Jul 9, 6:48 PM EDT	Severe Thunderstorm Warning	ILN	Wayne	47 min
Jul 9, 7:53 PM EDT	Severe Thunderstorm Warning	ILN	Franklin	47 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; radar from the NEXRAD Level II archive.