Alert archive / Kentucky / Tornado Warnings in 2010

Tornado Warning 34, NWS Paducah, KY

May 21, 2010Trigg County, Kentucky

NWS Paducah, KY issued this tornado warning at May 21, 2010, 3:03 PM CDT for Trigg County, Kentucky. It was in force for 20 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: May 21, 2010, 3:03 PM CDT (20:03 UTC)
Expired: May 21, 2010, 3:23 PM CDT
In force: 20 min
Issued by: NWS Paducah, KY
Area: Storm-based polygon

County Trigg County, KY

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.1 hours before the alert went out and 136 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: 367 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 294 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Paducah, KY wrote its last area forecast discussion before this tornado warning went out at May 21, 12:30 PM CDT, 2 hours 33 minutes earlier.

Area forecast discussion, May 21, 12:30 PM CDT, 2 hours 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PADUCAH KY
1230 PM CDT FRI MAY 21 2010

.DISCUSSION...
LATEST SURFACE ANALYSIS DEPICTS LOW CENTERED JUST SOUTH OF THE QUAD
CITIES...WITH COLD FRONT ARCING SOUTHWARD INTO SEMO. THE BACK EDGE
OF THE DEW POINT PACKING AND WESTWARD WIND SHIFT HAD JUST ENTERED
THE NORTHWEST PERIPHERY OF THE PAH FA AROUND NOON. LATEST LAPS DATA
INDICATE CAPES AROUND 1K J/KG IN THE WARM SECTOR AHEAD OF FRONT.
THIS COMBINED WITH LIS AROUND -2 AND MID 60 DEW POINTS SURGING UP
THE MISS VALLEY WILL RESULT IN A LINE OF THUNDERSTORM DEVELOPING
THIS AFTERNOON. CLOUD COVER WAS THE MAIN LIMITING FACTOR FOR
DESTABILIZATION. FORECAST SOUNDING FROM THE 12Z GFS AND NAM SUGGEST
CAPE RANGING FROM 1-2K J/KG WET BULB ZERO ABOVE 10K FEET. 0-3KM SRH
STAYS BELOW 150 M2S2. THEREFORE MAIN THREAT WILL BE FOR WIND OR
POSSIBLY HAIL. SINCE STABILITY SETS IN RAPIDLY FROM THE WEST BELIEVE
THE THREAT IS LIMITED TO THE SLGT RISK OUTLOOK AREA ESPECIALLY NORTH
AND EAST PORTIONS.

THE LATEST MODEL RUNS AGREE THIS SYSTEM WILL SHIFT EAST OF THE
REGION THIS EVENING. HIGH PRESSURE WILL THEN BUILD INTO THE
REGION...KEEPING US DRY THROUGH THE WEEKEND. TEMPERATURES WILL
INCREASE AS WE APPROACH NEXT WEEK...KEEPING TEMPS FLIRTING WITH 90
DEGREE MARK. MID 60 DEW POINTS WILL RETURN TO THE AREA AS WELL
MAKING FOR SUMMER TIME CONDITIONS. ALSO AN UPPER LEVEL LOW OFF THE
ATLANTIC COAST IS PROGGED TO RETROGRADE WESTWARD. THIS COMBINED WITH
ABUNDANT MOISTURE AND HEATING SHOULD ALLOW FOR ISOLATED AFTERNOON
THUNDERSTORMS MOST OF THE UPCOMING WORK WEEK. CLOUDS WILL BE ON THE
INCREASE THROUGH THE WEEK AS WELL.

OTHERWISE ONLY MINOR TWEAKS TO TEMPS SKY COVER AND DEW POINTS.

&&

.AVIATION...
SCT CONVECTION EXPECTED EAST OF THE MISSISSIPPI RIVER THIS
AFTERNOON. REFLECTED VCSH/VCTS AT KPAH/KOWB/KEVV TAF SITES.
OTHERWISE VFR SCT-BKN CIGS WITH OCNL MVFR EARLY IN THE AFTN.
END CONVECTIVE CHANCES AFT 00Z-01Z...WITH WSW WINDS GOING
LIGHT. HINTED AT FOG LATE TONIGHT PER LATEST MODEL SOUNDINGS.
WILL NOT BRING VSBYS DOWN TOO LOW AT THIS TIME DUE TO LOW
CONFIDENCE.

&&

.PAH WATCHES/WARNINGS/ADVISORIES...
KY...NONE.
MO...NONE.
IL...NONE.
IN...NONE.
&&

Hazardous weather outlook, May 21, 3:06 AM CDT, 11 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PADUCAH KY
306 AM CDT FRI MAY 21 2010

ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-
100-107>112-114-221000-
JEFFERSON-WAYNE IL-EDWARDS-WABASH-PERRY IL-FRANKLIN-HAMILTON-
WHITE-JACKSON-WILLIAMSON-SALINE-GALLATIN-UNION IL-JOHNSON-POPE-
HARDIN-ALEXANDER-PULASKI-MASSAC-GIBSON-PIKE-POSEY-VANDERBURGH-
WARRICK-SPENCER-FULTON-HICKMAN-CARLISLE-BALLARD-MCCRACKEN-GRAVES-
LIVINGSTON-MARSHALL-CALLOWAY-CRITTENDEN-LYON-TRIGG-CALDWELL-
UNION KY-WEBSTER-HOPKINS-CHRISTIAN-HENDERSON-DAVIESS-MCLEAN-
MUHLENBERG-TODD-PERRY MO-BOLLINGER-CAPE GIRARDEAU-WAYNE MO-CARTER-
RIPLEY-BUTLER-STODDARD-SCOTT-MISSISSIPPI-NEW MADRID-
306 AM CDT FRI MAY 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHERN
ILLINOIS...SOUTHWEST INDIANA...WESTERN KENTUCKY AND SOUTHEAST
MISSOURI.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY EAST OF A
CARMI ILLINOIS TO MAYFIELD KENTUCKY LINE. THUNDERSTORMS ARE
EXPECTED ALONG AND IN ADVANCE OF A COLD FRONT THAT WILL BE MOVING
ACROSS THE AREA. AS THE DAYTIME HEATS UP...STRONG TO SEVERE STORMS
COULD FIRE ALONG THE BOUNDARY AS IT MAKES ITS WAY EASTWARD.
DAMAGING WIND AND HAIL ARE THE PRIMARY SEVERE WEATHER
THREATS...WITH LOCALLY HEAVY RAIN AND LIGHTNING THE GENERAL
THUNDERSTORM THREATS.

FLOODING WILL CONTINUE ON A FEW AREA RIVERS. PLEASE REFER TO THE
LATEST RIVER FLOOD WARNINGS AND STATEMENTS FOR DETAILS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

FLOODING WILL CONTINUE ON A FEW AREA RIVERS. PLEASE REFER TO THE
LATEST RIVER FLOOD WARNINGS AND STATEMENTS FOR DETAILS.

.SPOTTER INFORMATION STATEMENT...

THERE IS A SMALL CHANCE THAT THE SLIGHT RISK AREA TODAY WILL
RESULT IN A REQUEST FOR SPOTTER ACTIVATION.

In the hours before

Local storm report, May 21, 2:59 PM CDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 2:51 PM CDT	Severe Thunderstorm Warning	PAH	Trigg	32 min
May 20, 7:59 PM CDT	River Flood Warning	PAH	Jackson	5 days

Nearby

Tornado Warnings in Kentucky, 2010 Every tornado warning in 2010 Tornadoes 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.