Alert archive / Ohio / Tornado Watches in 2007

Tornado Watch 482

July 4, 20075 states

The Storm Prediction Center issued this tornado watch at Jul 4, 2007, 1:41 PM EDT for 5 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jul 4, 2007, 1:41 PM EDT (17:41 UTC)
Expired: Jul 4, 2007, 9:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 106 counties

Dearborn County, IN, Fayette County, IN, Franklin County, IN, Ohio County, IN, Ripley County, IN, Switzerland County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Boyd County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Carter County, KY, Gallatin County, KY, Grant County, KY, Greenup County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Adams County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Meigs County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Allegheny County, PA, Beaver County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Braxton County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Hancock County, WV, Harrison County, WV, Jackson County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, Monongalia County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 81 km from the middle of the area, began a volume at 17:41 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jul 4, 2:55 PM EDT	Severe Thunderstorm Warning	ILN	Dearborn, Ohio	36 min
Jul 4, 3:54 PM EDT	Severe Thunderstorm Warning	ILN	Campbell	13 min
Jul 4, 4:13 PM EDT	Severe Thunderstorm Warning	ILN	Fairfield	25 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.7 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: 139 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 145 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
WWUS20 KWNS 041744
SEL2  
SPC WW 041744
INZ000-KYZ000-MDZ000-OHZ000-PAZ000-WVZ000-050100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 482
NWS STORM PREDICTION CENTER NORMAN OK
145 PM EDT WED JUL 4 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       SOUTHEAST INDIANA
       NORTHEAST KENTUCKY
       FAR WESTERN MARYLAND
       SOUTHERN AND CENTRAL OHIO
       SOUTHWEST PENNSYLVANIA
       NORTHERN AND CENTRAL WEST VIRGINIA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
900 PM EDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF CINCINNATI
OHIO TO 25 MILES SOUTH OF LATROBE PENNSYLVANIA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU2).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO POSE AN
INCREASING RISK FOR ISOLATED TORNADOES...IN ADDITION TO HIGH WIND
AND POSSIBLE HAIL... AS HEATING CONTINUES IN WEAKLY
CONFLUENT/MOISTENING WSW LOW LVL FLOW.  MODERATE DEEP NWLY SHEAR
WITH INCREASING DIRECTIONAL COMPONENT WITH ERN EXTENT MAY ENHANCE
POTENTIAL FOR STORMS TO REMAIN SEMI-DISCRETE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 29030.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 11:24 AM EDT	Mesoscale Discussion	SPC	Clark, Crawford, Daviess, Dearborn, Dubois, Floyd and 17 more	66 min
Jul 4, 1:27 PM EDT	Mesoscale Discussion	SPC	Clark, Crawford, Daviess, Dearborn, Dubois, Floyd and 18 more	63 min
Jul 4, 3:00 PM EDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Daviess, Dubois, Floyd, Gibson and 17 more	7 hr
Jul 4, 4:13 PM EDT	Mesoscale Discussion	SPC	Dearborn, Fayette, Franklin, Ohio, Switzerland, Union and 1 more	62 min
Jul 4, 6:14 PM EDT	Mesoscale Discussion	SPC	Clark, Crawford, Daviess, Dubois, Floyd, Gibson and 17 more	91 min
Jul 4, 2:06 PM EDT	Tornado Watch	SPC	Adams, Bedford, Berks, Bucks, Carbon, Chester and 17 more	8 hr
Jul 4, 12:39 PM EDT	Mesoscale Discussion	SPC	Berkeley, Jefferson	66 min
Jul 4, 4:27 PM EDT	Mesoscale Discussion	SPC	Greenbrier, Mercer, Monroe, Raleigh, Summers, Wyoming	63 min
Jul 4, 5:01 PM EDT	Severe Thunderstorm Watch	SPC	Greenbrier, Mercer, Monroe, Summers	4 hr

Nearby

Tornado Watches in Ohio, 2007 Tornado Watches in West Virginia, 2007 Tornado Watches in Kentucky, 2007 Every tornado watch in 2007

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.