Alert archive / Kentucky / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 87, NWS Jackson, KY

June 21, 201013 counties in Kentucky

NWS Jackson, KY issued this severe thunderstorm warning at Jun 21, 2010, 4:26 PM EDT for 13 counties in Kentucky. It was in force for 34 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: Jun 21, 2010, 4:26 PM EDT (20:26 UTC)
Expired: Jun 21, 2010, 5:00 PM EDT
In force: 34 min
Issued by: NWS Jackson, KY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bell County, KY, Clay County, KY, Floyd County, KY, Harlan County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Perry County, KY, Pike County, KY, Whitley County, KY

The radar

The Jackson,KY radar (KJKL), 48 km from the middle of the area, began a volume at 20:28 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, 8.4 hours before the alert went out and 256 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: 535 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 Jun 21, 3:53 PM EDT, 33 minutes earlier.

Area forecast discussion, Jun 21, 3:53 PM EDT, 33 minutes before

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Hazardous weather outlook, Jun 21, 4:30 AM EDT, 11 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON KY
430 AM EDT MON JUN 21 2010

KYZ044-050>052-058>060-068-069-079-080-083>088-104-106>120-221130-
FLEMING-MONTGOMERY-BATH-ROWAN-ESTILL-POWELL-MENIFEE-ROCKCASTLE-
JACKSON-PULASKI-LAUREL-WAYNE-MCCREARY-WHITLEY-KNOX-BELL-HARLAN-
ELLIOTT-MORGAN-JOHNSON-WOLFE-MAGOFFIN-FLOYD-LEE-BREATHITT-KNOTT-
OWSLEY-PERRY-CLAY-LESLIE-LETCHER-MARTIN-PIKE-
430 AM EDT MON JUN 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN KENTUCKY.

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND INTO THE EVENING...
PRIMARILY NORTH OF THE HAL ROGERS PARKWAY. A FEW OF THESE STORMS
COULD BE STRONG WITH FREQUENT CLOUD TO GROUND LIGHTNING...HEAVY RAINS
AND DAMAGING WIND GUSTS THE MAIN THREATS.

ADDITIONALLY...HEAT AND HUMIDITY WILL BE BUILDING INTO EASTERN
KENTUCKY TODAY. HEAT INDICES WILL REACH TO NEAR 95 THIS
AFTERNOON...MAINLY IN AND ALONG THE INTERSTATE 75 CORRIDOR.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NORTHERN PORTIONS OF EAST KENTUCKY MAY BE BRUSHED BY SCATTERED
THUNDERSTORMS DURING THE LATE AFTERNOON AND EARLY EVENING HOURS OF
TUESDAY AND WEDNESDAY.

MORE ORGANIZED CLUSTERS OF THUNDERSTORMS WILL BE POSSIBLE FROM
WEDNESDAY NIGHT THROUGH FRIDAY...MAINLY DURING THE AFTERNOON AND
EVENING...AS A SLOW MOVING FRONT DROPS THROUGH THE AREA. SCATTERED
THUNDERSTORMS WILL BE POSSIBLE ON SATURDAY AND SUNDAY...AS WELL.

ADDITIONALLY...HEAT AND HUMIDITY WILL CONTINUE TO BUILD ACROSS
EASTERN KENTUCKY THROUGH MIDWEEK. HEAT INDICES WILL REACH TO NEAR 95
EACH AFTERNOON FROM TUESDAY THROUGH THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO CALL IN HEAVY RAINFALL AMOUNTS AND REPORTS
OF DAMAGING WIND GUSTS FROM ANY THUNDERSTORM ACTIVITY THIS AFTERNOON
AND EVENING.

GREIF

In the hours before

Special weather statement, Jun 21, 3:08 PM EDT, 1 hour 18 minutes before

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Special weather statement, Jun 21, 3:12 PM EDT, 1 hour 14 minutes before

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Special weather statement, Jun 21, 3:36 PM EDT, 50 minutes before

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Special weather statement, Jun 21, 3:40 PM EDT, 46 minutes before

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Special weather statement, Jun 21, 4:05 PM EDT, 21 minutes before

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Special weather statement, Jun 21, 4:16 PM EDT, 10 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
Jun 21, 1:53 PM EDT	Severe Thunderstorm Warning	JKL	Bath, Fleming, Rowan	37 min
Jun 21, 1:57 PM EDT	Areal Flood Advisory	JKL	Bath, Fleming, Rowan	5 hr
Jun 21, 2:29 PM EDT	Severe Thunderstorm Warning	JKL	Bath, Fleming, Rowan	46 min
Jun 21, 2:37 PM EDT	Severe Thunderstorm Warning	JKL	Bath, Montgomery	23 min
Jun 21, 3:02 PM EDT	Severe Thunderstorm Warning	JKL	Elliott, Johnson, Magoffin, Morgan, Rowan	28 min
Jun 21, 3:30 PM EDT	Severe Thunderstorm Warning	JKL	Elliott, Johnson, Magoffin, Morgan	30 min
Jun 21, 4:02 PM EDT	Areal Flood Advisory	JKL	Breathitt, Knott, Lee, Magoffin, Perry, Wolfe	3 hr
Jun 21, 5:00 PM EDT	Severe Thunderstorm Warning	JKL	Bell, Clay, Floyd, Harlan, Knott, Knox and 4 more	45 min

Nearby

Severe Thunderstorm Warnings in Kentucky, 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.