Alert archive / Ohio / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 165, NWS Wilmington, OH

July 11, 2009Delaware County, Logan County, Union County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Jul 11, 2009, 5:12 PM EDT for Delaware County, Logan County, Union County, Ohio. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 11, 2009, 5:12 PM EDT (21:12 UTC)
Expired: Jul 11, 2009, 6:00 PM EDT
In force: 48 min
Issued by: NWS Wilmington, OH
Area: Storm-based polygon

Counties Delaware County, OH, Logan County, OH, Union County, OH

The radar

The Cincinnati radar (KILN), 107 km from the middle of the area, began a volume at 21:15 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 9.2 hours before the alert went out and 105 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: 912 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

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 11, 4:47 PM EDT, 25 minutes earlier.

Area forecast discussion, Jul 11, 4:47 PM EDT, 25 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
447 PM EDT SAT JUL 11 2009

.SYNOPSIS...
SHOWERS AND THUNDERSTORMS WILL END TONIGHT AS A COLD FRONT MOVES
OFF TO THE EAST. HIGH PRESSURE AND DRY AIR WILL BUILD IN BEHIND
THE FRONT FOR SUNDAY AND MONDAY.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
SEVERE WEATHER IS OCCURRING IN SOUTHEAST COUNTIES WITH GATE TO
GATE VELOCITY SIGNATURES REQUIRING TORNADO WARNINGS. ACTIVITY WILL
DIMINISH THIS EVENING AS A COLD FRONT MOVES THROUGH. SPLIT
DIFFERENCE IN TEMP GUIDANCE BETWEEN COOLER MAV AND WARMER MET.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/...
HIGH PRESSURE WILL PUSH ALL PRECIPITATION OUT OF THE AREA BY
SUNDAY MORNING...LEAVING MOSTLY SUNNY SKIES. THE DRY CONDITIONS
WILL CONTINUE SUNDAY NIGHT AS THE HIGH RIDES A NORTHWEST UPPER
FLOW.

TEMPERATURES WILL TOP OUT IN THE LOW TO MID 80S. STAYED CLOSER TO
MAV GUIDANCE.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
NUMERICAL MODEL SOLN/S ARE GENERALLY SIMILAR FOR THE LONG TERM PERIOD
THRU NEXT WEEK. UPPER LEVEL FLOW WILL BEGIN THE WEEK CHARACTERIZED
BY NORTHWESTERLY FLOW...WITH A SFC FRONTAL BOUNDARY TO OUR SOUTH
ACRS THE TN VLY. SFC HIGH PRESSURE WILL BUILD INTO OH VLY/GREAT
LAKES...PROVIDING DRY WX FOR BOTH MONDAY AND TUESDAY.

MID/UPR LEVEL FLOW FLATTENS AND BECOMES MORE ZONAL WITH A S/W RIDING
THROUGH THE GREAT LAKES AT MID WEEK. WL SPREAD A CHC OF THUNDERSTORMS
INTO THE AREA LATE TUESDAY NIGHT AHEAD OF AN APPROACHING WARM FRONT.
WL SEE A CONTD CHANCE OF CONVECTION WED/WED NIGHT WITH THE APPROACH
AND PASSAGE OF A COLD FRONT.

MID/UPR LEVEL FLOW TRANSITIONS MORE NORTHWESTERLY IN THE WAKE OF THE
AFOREMENTIONED S/W ON THURSDAY. WL TREND FCST DRY WITH SFC HIGH
PRESSURE BUILDING IN.

UNCERTAINTY CREEPS INTO THE FCST LATE NEXT WEEK DUE TO AN EMBEDDED
S/W AND TROF DEVELOPING OVER THE GREAT LAKES. MOISTURE IS LIMITED AND
THEREFORE FOR NOW HAVE JUST INCLUDED A SILENT 20 POP ON SATURDAY.

&&

.AVIATION /21Z SATURDAY THROUGH THURSDAY/...
OCCASIONAL MVFR TO EVEN APPROACHING IFR VSBYS IN TSTMS. CONVECTION
LOOKS TO BE PUSHING THROUGH REGION A LITTLE MORE QUICKLY...WITH
FROPA TO BE EVEN SOUTH OF KCVG/KLUK BY 03Z-04Z TIMEFRAME. WITH
NOT MUCH WIND EXPECTED BEHIND FRONT AND PLENTY OF SFC
MSTR...INCLUDED PERIOD OF POSSIBLE IFR AT KILN/KLUK/KCVG DURING
PRE-DAWN HOURS. OTHERWISE...INCLUDED ONLY MVFR AT OTHER LOCATIONS.

OUTLOOK...NO SIGNIFICANT WEATHER EXPECTED.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
KY...NONE.
IN...NONE.

&&

SYNOPSIS...CONIGLIO
NEAR TERM...CONIGLIO
SHORT TERM...CONIGLIO
LONG TERM...AR
AVIATION...JDR

Hazardous weather outlook, Jul 11, 5:01 AM EDT, 12 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WILMINGTON OH
501 AM EDT SAT JUL 11 2009

INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046-
051>056-060>065-070>074-077>082-088-120915-
WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-RIPLEY-DEARBORN-OHIO-
SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON-CAMPBELL-OWEN-GRANT-
PENDLETON-BRACKEN-ROBERTSON-MASON-LEWIS-HARDIN-MERCER-AUGLAIZE-DARKE-
SHELBY-LOGAN-UNION OH-DELAWARE-MIAMI-CHAMPAIGN-CLARK-MADISON-
FRANKLIN OH-LICKING-PREBLE-MONTGOMERY-GREENE-FAYETTE OH-PICKAWAY-
FAIRFIELD-BUTLER-WARREN-CLINTON-ROSS-HOCKING-HAMILTON-CLERMONT-BROWN-
HIGHLAND-ADAMS-PIKE-SCIOTO-
501 AM EDT SAT JUL 11 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL
INDIANA...SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN
KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL
OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

NUMEROUS THUNDERSTORMS WILL DEVELOP ALONG A COLD FRONT AND MOVE
ACROSS THE REGION THIS AFTERNOON AND EVENING. A FEW OF THESE
STORMS MAY PRODUCE DAMAGING WINDS AND CONTAIN LARGE HAIL.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON.

In the hours before

Local storm report, Jul 11, 1:35 PM EDT, 3 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
135 PM EDT SAT JUL 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0118 PM     FLASH FLOOD      GETTYSBURG              40.12N 84.50W
07/11/2009                   DARKE              OH   LAW ENFORCEMENT

            MULTIPLE REPORTS OF STREET FLOODING. PERSON STRANDED IN
            VEHICLE IN HIGH WATER IN GETTYSBURG.

&&

NG

Local storm report, Jul 11, 2:35 PM EDT, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
235 PM EDT SAT JUL 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0200 PM     FLASH FLOOD      TROY                    40.04N 84.22W
07/11/2009                   MIAMI              OH   LAW ENFORCEMENT

            NUMEROUS ROADS WITH VERY HIGH WATER. MAINLY IN TROY...BUT
            ALSO NEAR COVINGTON.

&&

JDR

Local storm report, Jul 11, 4:29 PM EDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
429 PM EDT SAT JUL 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0401 PM     TORNADO          BUCHANAN                39.15N 83.12W
07/11/2009                   PIKE               OH   LAW ENFORCEMENT

            POSSIBLE TORNADO WITH TREES DOWN AND HOUSE TRAILERS
            DESTROYED.

&&

GALLAGHER

Local storm report, Jul 11, 4:57 PM EDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
457 PM EDT SAT JUL 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0400 PM     TORNADO          10 SSW CHILLICOTHE      39.20N 83.06W
07/11/2009                   ROSS               OH   LAW ENFORCEMENT

            POSSIBLE TORNADO NEAR S. R.772 AND VALLEY-SCHAFFER-DENVER
            ROAD OR NEAR SUMMITHILL. HOUSES DAMAGED...TREES AND POWER
            LINES DOWNED.

&&

SFH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 11:52 AM EDT	Areal Flood Advisory	ILN	Darke, Miami	103 min
Jul 11, 12:47 PM EDT	Areal Flood Advisory	ILN	Clark, Greene, Montgomery	3 hr
Jul 11, 1:23 PM EDT	Flash Flood Warning	ILN	Darke, Miami	2 hr
Jul 11, 1:38 PM EDT	Areal Flood Advisory	ILN	Champaign, Clark, Miami	3 hr
Jul 11, 2:30 PM EDT	Areal Flood Advisory	ILN	Fayette, Franklin, Madison, Pickaway	3 hr
Jul 11, 3:48 PM EDT	Tornado Warning	ILN	Pike, Ross	27 min
Jul 11, 3:57 PM EDT	Severe Thunderstorm Warning	ILN	Pike	48 min
Jul 11, 4:03 PM EDT	Tornado Warning	ILN	Pike	42 min
Jul 11, 4:22 PM EDT	Tornado Warning	ILN	Pike, Scioto	23 min
Jul 11, 4:40 PM EDT	Tornado Warning	ILN	Scioto	35 min
Jul 11, 5:00 PM EDT	Areal Flood Advisory	ILN	Pike, Scioto	3 hr
Jul 11, 5:24 PM EDT	Flash Flood Warning	ILN	Scioto	3 hr

Nearby

Severe Thunderstorm Warnings in Ohio, 2009 Every severe thunderstorm warning in 2009

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.