Alert archive / Kentucky / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 213, NWS Jackson, KY

September 8, 2009Floyd County, Knott County, Kentucky

NWS Jackson, KY issued this severe thunderstorm warning at Sep 8, 2009, 5:09 PM EDT for Floyd County, Knott County, Kentucky. 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: Sep 8, 2009, 5:09 PM EDT (21:09 UTC)
Expired: Sep 8, 2009, 5:40 PM EDT
In force: 31 min
Issued by: NWS Jackson, KY
Area: Storm-based polygon

Counties Floyd County, KY, Knott County, KY

The radar

The Jackson,KY radar (KJKL), 44 km from the middle of the area, began a volume at 21:11 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 235 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: 388 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jackson, KY wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 8, 3:43 PM EDT, 1 hour 26 minutes earlier.

Area forecast discussion, Sep 8, 3:43 PM EDT, 1 hour 26 minutes before

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Hazardous weather outlook, Sep 8, 4:31 PM EDT, 38 minutes before

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In the hours before

Special weather statement, Sep 8, 2:59 PM EDT, 2 hours 10 minutes before

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Special weather statement, Sep 8, 3:01 PM EDT, 2 hours 8 minutes before

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Local storm report, Sep 8, 3:53 PM EDT, 1 hour 16 minutes before

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Special weather statement, Sep 8, 3:55 PM EDT, 1 hour 14 minutes before

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Special weather statement, Sep 8, 4:24 PM EDT, 45 minutes before

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Special weather statement, Sep 8, 4:52 PM EDT, 17 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 10:30 PM EDT	Dense Fog Advisory	JKL	Bath, Bell, Breathitt, Clay, Elliott, Estill and 27 more	12 hr
Sep 8, 1:44 PM EDT	Areal Flood Advisory	JKL	Bath	2 hr
Sep 8, 1:51 PM EDT	Severe Thunderstorm Warning	JKL	Bath	39 min
Sep 8, 2:39 PM EDT	Severe Thunderstorm Warning	JKL	Bath, Menifee, Montgomery, Powell	35 min
Sep 8, 3:23 PM EDT	Severe Thunderstorm Warning	JKL	Estill, Jackson, Lee, Owsley, Powell, Wolfe	52 min
Sep 8, 3:38 PM EDT	Severe Thunderstorm Warning	JKL	Breathitt, Perry	52 min
Sep 8, 4:13 PM EDT	Severe Thunderstorm Warning	JKL	Breathitt, Clay, Jackson, Owsley, Perry	47 min
Sep 8, 4:22 PM EDT	Areal Flood Advisory	JKL	Breathitt, Clay, Jackson, Lee, Owsley, Perry	101 min
Sep 8, 4:59 PM EDT	Severe Thunderstorm Warning	JKL	Clay, Leslie, Owsley, Perry	46 min

Nearby

Severe Thunderstorm Warnings in Kentucky, 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.