Alert archive / Kentucky / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 53, NWS Louisville, KY

April 28, 1999Henry County, Oldham County, Kentucky

NWS Louisville, KY issued this severe thunderstorm warning at Apr 28, 1999, 4:58 PM EDT for Henry County, Oldham County, Kentucky. It was in force for 32 min. 4 reports 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: Apr 28, 1999, 4:58 PM EDT (20:58 UTC)
Expired: Apr 28, 1999, 5:30 PM EDT
In force: 32 min
Issued by: NWS Louisville, KY
Area: Whole counties

Counties Henry County, KY, Oldham County, KY

What was reported inside it

Time	Report	Where	Remark
Apr 28, 5:05 PM EDT	Hail 0.75	La Grange, KY
Apr 28, 5:20 PM EDT	Hail 1.75	Pendleton, KY	Golfball size hail reported in western Henry county
Apr 28, 5:25 PM EDT	Thunderstorm Wind 50	New Castle, KY	Several trees knocked down.
Apr 28, 5:25 PM EDT	Hail 1	New Castle, KY

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, 9.0 hours before the alert went out and 170 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

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 Apr 28, 2:50 PM EDT, 2 hours 8 minutes earlier.

Area forecast discussion, Apr 28, 2:50 PM EDT, 2 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE, KY
250 PM EDT WED APR 28 1999

WARMING OF THE MOIST / LOW LAYERS PLUS COLD AIR SWEEPING IN ALOFT..
HAS INSTIGATED NUMEROUS SHWRS/TSTMS ACRS FA THIS AFTN.  MODELS VERY
SIMILIAR IN TAKING SRN IL VERTICALLY STACKED LOW  SEWD OVNGT INTO
TN BY THU MRNG.  THE SHORT TERM CONCENTRATION  OF PCPN SHUD BE ACRS
CNTRL KY/SRN IND NEAR LOW  LVL CONVG BNDRY... AXIS OF 1000-2000J/KG
CAPES...THETA E RDG AXIS... AND ON NOSE OF WLY JET STREAK. WILL HIT
POPS HARD TNGT MUCH OF FA..WITH A DMNSHG TREND NRN PART OF FA AFTER
MIDNIGHT. LARGE HAIL AGAIN WILL BE THE PRIMARY SVR WX MODE THRU THE
EVNG. TEMPS OK FM FAN/FWC GUIDE.

AS TROFFINESS THEN SLIPS SOUTH THRU RGN ON THU...CLDS/PCPN SHUD ALSO
SLIP SOUTH WITH TIME.  WILL  HOLD ONTO SML PCPN CHC SDF-LEX CORRIDOR
ERY...AND KEEP CHCS GOING SRN KY ALL DAY. HAVE PLAYED A BIT MORE OF
A CONSERVATIVE APPROACH WITH CLEARING NRN SECTIONS THU AFTN...AS
SOUNDING INFO STILL SHOWS LINGERING LOW LVL MOIST.

AS FLOW BECOMES MORE ANTICYCLONIC WITH TIME AND TROF SLIPS INTO THE
DEEP SOUTH... QUIET WX WILL ENCOMPASSE ENTIRE FA FOR THE END OF THE
WORK WEEK.

H85 THERMAL PTN...PLUS GOING THICKNESSS...SUPPORTS FWC/FAN GUIDE
OF COOLING TREND THRU FRI.

.SDF...NONE.
STUREY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 3:43 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson	32 min
Apr 28, 3:45 PM EDT	Severe Thunderstorm Warning	LMK	Nelson, Spencer	30 min
Apr 28, 4:01 PM EDT	Severe Thunderstorm Warning	LMK	Bullitt	29 min
Apr 28, 4:13 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson	32 min
Apr 28, 5:15 PM EDT	Severe Thunderstorm Warning	LMK	Trimble	25 min
Apr 28, 5:41 PM EDT	Severe Thunderstorm Warning	LMK	Hardin, Meade	29 min
Apr 28, 6:44 PM EDT	Flash Flood Warning	LMK	Hardin	61 min
Apr 28, 6:45 PM EDT	Severe Thunderstorm Warning	LMK	Adair	30 min
Apr 27, 10:10 PM EDT	Severe Thunderstorm Warning	LMK	Dubois	45 min
Apr 28, 2:22 PM EDT	Severe Thunderstorm Warning	LMK	Perry	23 min
Apr 28, 3:14 PM EDT	Severe Thunderstorm Warning	LMK	Crawford	46 min
Apr 28, 4:01 PM EDT	Severe Thunderstorm Warning	LMK	Crawford, Harrison	44 min
Apr 28, 4:26 PM EDT	Flash Flood Warning	LMK	Crawford	2 hr

Nearby

Severe Thunderstorm Warnings in Kentucky, 1999 Every 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.