Alert archive / Kentucky / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 57, NWS Jackson, KY

July 30, 1999Knott County, Kentucky

NWS Jackson, KY issued this severe thunderstorm warning at Jul 30, 1999, 6:21 PM EDT for Knott County, Kentucky. It was in force for 64 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 30, 1999, 6:21 PM EDT (22:21 UTC)
Expired
Jul 30, 1999, 7:25 PM EDT
In force
64 min
Issued by
NWS Jackson, KY
Area
Whole counties

County Knott County, KY

What was reported inside it

TimeReportWhereRemark
Jul 30, 7:05 PM EDTHail 2.75Hindman, KYBaseball sized hail was reported in the town of Hindman.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.4 hours before the alert went out and 242 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 1999-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3564 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 1999-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3564 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
983 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
1.6
Supercell composite
10.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 6:58 AM EDTSevere Thunderstorm WarningJKLPike32 min
Jul 30, 10:05 AM EDTSevere Thunderstorm WarningJKLPike45 min
Jul 30, 5:03 PM EDTFlash Flood WarningJKLMagoffin2 hr
Jul 30, 7:19 PM EDTSevere Thunderstorm WarningJKLPerry61 min

Nearby

Severe Thunderstorm Warnings in Kentucky, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.