Alert archive / Indiana / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 186, NWS Louisville, KY

July 20, 2010Jefferson County, Indiana

NWS Louisville, KY issued this severe thunderstorm warning at Jul 20, 2010, 8:48 PM EDT for Jefferson County, Indiana. It was in force for 42 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 20, 2010, 8:48 PM EDT (00:48 UTC)
Expired: Jul 20, 2010, 9:30 PM EDT
In force: 42 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Hail: 0.5 in
Wind: 60.0 mph

County Jefferson County, IN

The radar

The Louisville radar (KLVX), 100 km from the middle of the area, began a volume at 00:49 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 00:00Z, 0.8 hours before the alert went out and 159 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: 717 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.7

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 Louisville, KY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 7:02 PM EDT, 1 hour 46 minutes earlier.

Area forecast discussion, Jul 20, 7:02 PM EDT, 1 hour 46 minutes before

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Hazardous weather outlook, Jul 20, 3:49 PM EDT, 4 hours 59 minutes before

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In the hours before

Special weather statement, Jul 20, 6:35 PM EDT, 2 hours 13 minutes before

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Special weather statement, Jul 20, 6:57 PM EDT, 1 hour 51 minutes before

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Special weather statement, Jul 20, 8:08 PM EDT, 40 minutes before

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The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 8:08 PM EDT	Special Weather Statement	LMK	Clark	37 min
Jul 20, 11:27 PM EDT	Special Weather Statement	LMK	Nicholas	33 min
Jul 21, 4:37 AM EDT	Special Weather Statement	LMK	Bourbon, Scott	38 min
Jul 21, 5:13 AM EDT	Special Weather Statement	LMK	Bourbon	32 min
Jul 21, 6:09 AM EDT	Special Weather Statement	LMK	Meade	36 min
Jul 21, 6:18 AM EDT	Special Weather Statement	LMK	Jefferson	42 min
Jul 21, 6:38 AM EDT	Special Weather Statement	LMK	Bullitt, Meade	37 min
Jul 21, 7:03 AM EDT	Special Weather Statement	LMK	Nelson, Shelby, Spencer	27 min
Jul 21, 7:15 AM EDT	Special Weather Statement	LMK	Fayette, Jessamine, Mercer	30 min
Jul 21, 7:32 AM EDT	Special Weather Statement	LMK	Anderson, Franklin, Marion, Mercer, Washington, Woodford	28 min
Jul 21, 7:46 AM EDT	Special Weather Statement	LMK	Clark, Jessamine, Madison	29 min
Jul 21, 7:50 AM EDT	Severe Thunderstorm Warning	LMK	Boyle, Mercer, Washington	25 min
Jul 21, 8:02 AM EDT	Special Weather Statement	LMK	Bourbon, Fayette, Jessamine, Woodford	28 min
Jul 21, 8:04 AM EDT	Special Weather Statement	LMK	Marion	26 min
Jul 21, 8:09 AM EDT	Areal Flood Advisory	LMK	Fayette	111 min
Jul 21, 8:23 AM EDT	Special Weather Statement	LMK	Grayson	22 min
Jul 21, 8:28 AM EDT	Special Weather Statement	LMK	Casey, Garrard, Lincoln	62 min
Jul 21, 8:30 AM EDT	Special Weather Statement	LMK	Clark, Madison	45 min
Jul 21, 8:45 AM EDT	Areal Flood Advisory	LMK	Butler, Edmonson, Grayson	3 hr
Jul 21, 10:18 AM EDT	Flash Flood Warning	LMK	Butler, Ohio	6 hr
Jul 21, 10:44 AM EDT	Special Weather Statement	LMK	Casey, Lincoln	31 min
Jul 21, 11:12 AM EDT	Flash Flood Warning	LMK	Edmonson, Grayson, Ohio	3 hr
Jul 21, 12:08 PM EDT	Special Weather Statement	LMK	Barren, Metcalfe	37 min
Jul 21, 12:28 PM EDT	Flash Flood Warning	LMK	Ohio	3 hr
Jul 21, 1:26 PM EDT	Special Weather Statement	LMK	Ohio	49 min
Jul 21, 1:35 PM EDT	Flash Flood Warning	LMK	Barren, Edmonson, Hart, Warren	4 hr
Jul 21, 1:41 PM EDT	Special Weather Statement	LMK	Clinton, Cumberland	49 min
Jul 21, 1:58 PM EDT	Flash Flood Warning	LMK	Edmonson, Grayson, Ohio	3 hr
Jul 21, 2:05 PM EDT	Flash Flood Warning	LMK	Butler, Edmonson, Warren	3 hr
Jul 21, 2:27 PM EDT	Special Weather Statement	LMK	Allen, Barren, Logan, Metcalfe, Monroe, Simpson and 1 more	2 hr
Jul 21, 2:39 PM EDT	Areal Flood Advisory	LMK	Allen, Barren, Butler, Logan, Simpson, Warren	3 hr
Jul 21, 2:49 PM EDT	Flash Flood Warning	LMK	Logan, Simpson, Warren	3 hr
Jul 21, 4:24 AM EDT	Special Weather Statement	LMK	Dubois	36 min
Jul 21, 5:27 AM EDT	Special Weather Statement	LMK	Orange	48 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2010 Every severe thunderstorm warning in 2010

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.