Alert archive / Ohio / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 508
The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 2012, 10:35 AM EDT for 6 counties in Indiana; 8 counties in Kentucky; 18 counties in Ohio. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2012, 10:35 AM EDT (14:35 UTC)
- Expired
- Jul 24, 2012, 1:37 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 32 counties
Dearborn County, IN, Fayette County, IN, Franklin County, IN, Ripley County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Pendleton County, KY, Robertson County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Fayette County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Miami County, OH, Montgomery County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Warren County, OH
The radar
The Cincinnati radar (KILN), 49 km from the middle of the area, began a volume at 14:38 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 50%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 10:49 AM EDT | Severe Thunderstorm Warning | ILN | Union, Wayne | 26 min |
| Jul 24, 10:56 AM EDT | Severe Thunderstorm Warning | ILN | Clark, Miami | 34 min |
| Jul 24, 11:13 AM EDT | Severe Thunderstorm Warning | ILN | Union, Wayne | 32 min |
| Jul 24, 11:22 AM EDT | Severe Thunderstorm Warning | ILN | Clark, Clinton, Fayette, Greene | 23 min |
| Jul 24, 11:34 AM EDT | Severe Thunderstorm Warning | ILN | Brown, Clermont, Clinton, Highland, Warren | 26 min |
| Jul 24, 11:42 AM EDT | Severe Thunderstorm Warning | ILN | Campbell | 48 min |
| Jul 24, 12:03 PM EDT | Severe Thunderstorm Warning | ILN | Adams, Brown, Clermont, Clinton, Highland, Warren | 27 min |
| Jul 24, 12:23 PM EDT | Severe Thunderstorm Warning | ILN | Lewis | 37 min |
| Jul 24, 12:25 PM EDT | Severe Thunderstorm Warning | ILN | Bracken, Lewis, Mason | 50 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, 2.6 hours before the alert went out and 50 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.
- Mixed-layer CAPE
- 1858 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1124 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.7
The text
As transmitted, in the capitals the NWS used until 2016.
543
WWUS20 KWNS 241437
SEL8
SPC WW 241437
INZ000-KYZ000-OHZ000-241900-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 508
NWS STORM PREDICTION CENTER NORMAN OK
1035 AM EDT TUE JUL 24 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST INDIANA
NORTHEAST KENTUCKY
SOUTHWEST OHIO
EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 1035 AM UNTIL
300 PM EDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF DAYTON OHIO TO 65 MILES SOUTHEAST OF CINCINNATI
OHIO. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 507...
DISCUSSION...A FAST MOVING CLUSTER OF THUNDERSTORMS OVER NORTHERN
IND HAS A HISTORY OF DAMAGING WINDS. THIS ACTIVITY IS FORECAST TO
TRACK SOUTHEASTWARD ACROSS THE WATCH AREA THROUGH THE LATE MORNING
AND EARLY AFTERNOON HOURS. WIDESPREAD CLOUDS ARE LIMITING
CONFIDENCE IN THE DEGREE OF DESTABILIZATION...BUT FAST STORM MOTION
AND FAVORABLE MID LEVEL LAPSE RATES WARRANT CONCERN FOR SEVERE WINDS
AT LEAST AS FAR SOUTHEAST AS THE OH RIVER.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 31045.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 5:47 AM EDT | Severe Thunderstorm Watch | SPC | Jasper, Lake, Newton, Porter | 4 hr |
| Jul 24, 7:35 AM EDT | Mesoscale Discussion | SPC | Blackford, Carroll, Cass, Clinton, Delaware, Elkhart and 23 more | 55 min |
| Jul 24, 8:00 AM EDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 27 more | 3 hr |
| Jul 24, 10:08 AM EDT | Mesoscale Discussion | SPC | Adams, Blackford, Delaware, Fayette, Grant, Hamilton and 11 more | 97 min |
| Jul 24, 4:25 PM EDT | Mesoscale Discussion | SPC | Crawford, Daviess, Dubois, Gibson, Knox, Orange and 6 more | 95 min |
| Jul 24, 11:43 AM EDT | Mesoscale Discussion | SPC | Bath, Bourbon, Boyd, Breathitt, Carter, Clark and 26 more | 62 min |
| Jul 24, 11:59 AM EDT | Mesoscale Discussion | SPC | Boone, Bracken, Campbell, Greenup, Kenton, Lewis and 3 more | 61 min |
| Jul 24, 12:33 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Anderson, Bath, Bell, Bourbon, Boyd and 61 more | 6 hr |
| Jul 24, 1:52 PM EDT | Mesoscale Discussion | SPC | Anderson, Bath, Bourbon, Boyd, Boyle, Breathitt and 47 more | 53 min |
| Jul 24, 3:25 PM EDT | Mesoscale Discussion | SPC | Adair, Anderson, Bell, Bourbon, Boyle, Breathitt and 44 more | 95 min |
| Jul 24, 6:20 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Barren, Bell, Breckinridge, Butler and 26 more | 4 hr |
| Jul 24, 11:48 AM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Harrison, Jefferson, Stark | 87 min |
Nearby
Severe Thunderstorm Watches in Ohio, 2012Severe Thunderstorm Watches in Kentucky, 2012Severe Thunderstorm Watches in Indiana, 2012Every severe thunderstorm watch in 2012
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.