Alert archive / Ohio / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 189, NWS Wilmington, OH

August 20, 2009Pike County, Ross County, Scioto County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Aug 20, 2009, 1:41 PM EDT for Pike County, Ross County, Scioto County, Ohio. It was in force for 31 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: Aug 20, 2009, 1:41 PM EDT (17:41 UTC)
Expired: Aug 20, 2009, 2:12 PM EDT
In force: 31 min
Issued by: NWS Wilmington, OH
Area: Storm-based polygon

Counties Pike County, OH, Ross County, OH, Scioto County, OH

The radar

The Cincinnati radar (KILN), 78 km from the middle of the area, began a volume at 17:44 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, 5.7 hours before the alert went out and 77 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: 1087 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 588 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.4

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 Aug 20, 10:33 AM EDT, 3 hours 8 minutes earlier.

Area forecast discussion, Aug 20, 10:33 AM EDT, 3 hours 8 minutes before

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Hazardous weather outlook, Aug 20, 4:35 AM EDT, 9 hours 6 minutes before

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In the hours before

Local storm report, Aug 20, 9:10 AM EDT, 4 hours 31 minutes before

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Special weather statement, Aug 20, 1:10 PM EDT, 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
110 PM EDT THU AUG 20 2009

OHZ073-081-082-088-201800-
ROSS OH-PIKE OH-SCIOTO OH-ADAMS OH-
110 PM EDT THU AUG 20 2009

...A STRONG THUNDERSTORM WILL AFFECT EASTERN ADAMS...NORTHWESTERN
SCIOTO...PIKE AND SOUTHEASTERN ROSS COUNTIES THROUGH 200 PM EDT...

AT 109 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM LOCATED NEAR PEEBLES...MOVING NORTHEAST AT 45
MPH.

THIS STORM WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 50 MPH...AND
VERY HEAVY DOWNPOURS.

LOCATIONS IMPACTED INCLUDE...
KINCAID SPRINGS...LUCASVILLE...PIKE LAKE...PIKETON AND WAVERLY.

IN ADDITION...SMOKY CORNERS...OTWAY...RARDEN...LOMBARDSVILLE...POPLAR
GROVE...MCDERMOTT...BEAR CREEK AND ELM GROVE ARE NEAR THE PATH OF
THIS STORM.

RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT. IF THIS STORM BECOMES
STRONGER...THEN A WARNING MAY BE NEEDED.

HATZOS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:11 PM EDT	Areal Flood Advisory	ILN	Clark, Greene, Miami, Montgomery	3 hr
Aug 19, 8:27 PM EDT	Severe Thunderstorm Warning	ILN	Logan	33 min
Aug 19, 8:38 PM EDT	Areal Flood Advisory	ILN	Logan, Shelby	3 hr
Aug 19, 9:23 PM EDT	Areal Flood Advisory	ILN	Delaware, Logan, Union	3 hr
Aug 20, 4:11 PM EDT	Tornado Warning	ILN	Hocking, Pickaway, Ross	34 min
Aug 20, 4:29 PM EDT	Tornado Warning	ILN	Fayette, Pickaway, Ross	46 min
Aug 20, 4:39 PM EDT	Tornado Warning	ILN	Hocking, Pickaway, Ross	36 min
Aug 20, 5:04 PM EDT	Tornado Warning	ILN	Hocking	26 min

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.