Alert archive / Kentucky / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Wilmington, OH

August 4, 2009Grant County, Owen County, Kentucky

NWS Wilmington, OH issued this flash flood warning at Aug 4, 2009, 2:17 PM EDT for Grant County, Owen County, Kentucky. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 4, 2009, 2:17 PM EDT (18:17 UTC)
Expired
Aug 4, 2009, 5:15 PM EDT
In force
3 hr
Issued by
NWS Wilmington, OH
Area
Storm-based polygon
Flood severity
None

Counties Grant County, KY, Owen County, KY

The radar

The Louisville radar (KLVX), 107 km from the middle of the area, began a volume at 18:18 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.

What was reported inside it

TimeReportWhereRemark
Aug 4, 2:43 PM EDTFLASH FLOODGratz, KYWATER REPORTED CROSSING THE ROAD ON HIGHWAY 355.
Aug 4, 4:22 PM EDTFLASH FLOODOwenton, KYFLOODING FORCED THE EVACUATION OF A TRAILER AND 2 PEOPLE WERE RESCUED FROM THEIR VEHICLE TRAPPED ON A FLOODED BRIDGE ON TERESITA ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.3 hours before the alert went out and 299 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, Nashville Metro, TN at 12:00Z on 2009-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3443 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2009-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.1939Sfc1 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
3443 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS51 KILN 041817
FFWILN
KYC081-187-042115-
/O.NEW.KILN.FF.W.0021.090804T1817Z-090804T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
217 PM EDT TUE AUG 4 2009

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN GRANT COUNTY IN NORTHERN KENTUCKY...
  SOUTHERN OWEN COUNTY IN NORTHERN KENTUCKY...

* UNTIL 515 PM EDT.

* AT 212 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
THAT THUNDERSTORMS HAD PRODUCED HEAVY RAINFALL ACROSS THE WARNED   
AREA. RADAR ESTIMATED 1 TO 2 INCHES OF RAIN HAD FALLEN ACROSS THE 
WARNING AREA SINCE 1 PM EDT. 

* HEAVY RAIN CONTINUES TO FALL ACROSS THE WARNED AREA WITH AN 
ADDITIONAL 1 TO 2 INCHES POSSIBLE THROUGH 515 PM EDT. RUNOFF FROM 
THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR.

SOME LOCATIONS THAT MAY EXPERIENCE FLOODING INCLUDE...OWENTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINS FLOOD ROADS AND LOW LYING AREAS RAPIDLY. DO NOT DRIVE
YOUR VEHICLE INTO WATER OF AN UNKNOWN DEPTH ON THE THE ROAD. IT ONLY
TAKES TWO FEET OF RUSHING WATER TO CARRY AWAY MOST SPORT UTILITY
VEHICLES AND PICKUPS. TAKE A DIFFERENT ROUTE TO REACH YOUR
DESTINATION OR WAIT UNTIL THE WATER RECEDES. REMEMBER...MOST FLOOD
RELATED DEATHS OCCUR IN AUTOMOBILES.

&&

LAT...LON 3835 8487 3838 8491 3842 8490 3844 8494
      3845 8493 3842 8497 3846 8497 3849 8500
      3851 8499 3852 8497 3860 8472 3851 8453
      3839 8468 3834 8477

$$

The office that day

Everything else NWS Wilmington, OH issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 4, 8:42 AM EDTSevere Thunderstorm WarningILNLewis19 min
Aug 4, 9:06 AM EDTAreal Flood AdvisoryILNLewis, Mason3 hr
Aug 4, 11:11 AM EDTFlash Flood WatchILNBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more16 hr
Aug 4, 11:55 AM EDTSevere Thunderstorm WarningILNCarroll, Gallatin, Owen50 min
Aug 4, 12:37 PM EDTAreal Flood AdvisoryILNCarroll, Gallatin, Owen3 hr
Aug 4, 1:36 PM EDTFlash Flood WarningILNCarroll, Gallatin, Owen3 hr
Aug 4, 4:29 PM EDTAreal Flood WarningILNCarroll, Gallatin, Grant, Owen4 hr

Nearby

Flash Flood Warnings in Kentucky, 2009Every flash flood 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.