Alert archive / Tennessee / Flash Flood Warnings in 2004

Flash Flood Warning 9, NWS Nashville, TN

March 20, 2004Sumner County, Tennessee

NWS Nashville, TN issued this flash flood warning at Mar 20, 2004, 2:39 PM CST for Sumner County, Tennessee. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 20, 2004, 2:39 PM CST (20:39 UTC)
Expired: Mar 20, 2004, 4:45 PM CST
In force: 2 hr
Issued by: NWS Nashville, TN
Area: Counties, with a storm outline in the text

County Sumner County, TN

The radar

The Nashville radar (KOHX), 30 km from the middle of the area, began a volume at 20:43 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.7 hours before the alert went out and 43 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: 1720 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KOHX 202046
FFWBNA
TNC165-202245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
239 PM CST SAT MAR 20 2004

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUMNER COUNTY IN TENNESSEE

* UNTIL 445 PM CST

* AT 232 PM CST...WEATHER RADAR INDICATED THUNDERSTORMS PRODUCING    
  VERY HEAVY RAIN ACROSS SUMNER COUNTY. RADAR ESTIMATED RAINFALL     
  RATES BETWEEN 1 AND 1.75 INCHES PER HOUR FOR THE PAST TWO HOURS.   
  THE LINE OF STORMS WILL CONTINUE TO AFFECT SUMNER COUNTY THROUGH   
  330 PM CST.
   
* CITIES AFFECTED THROUGH 445 PM CST INCLUDE...
  WESTMORELAND...PORTLAND...MILLERSVILLE...HENDERSONVILLE...GALLATIN

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT 
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 3665 8620 3636 8630 3624 8661 3641 8674
          3667 8656

$$
05

The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 20, 12:13 PM CST	Severe Thunderstorm Warning	OHX	Stewart	62 min
Mar 20, 12:58 PM CST	Severe Thunderstorm Warning	OHX	Montgomery	62 min
Mar 20, 1:13 PM CST	Severe Thunderstorm Warning	OHX	Stewart	62 min
Mar 20, 1:15 PM CST	Severe Thunderstorm Warning	OHX	Benton	45 min
Mar 20, 1:30 PM CST	Tornado Warning	OHX	Stewart	45 min
Mar 20, 1:36 PM CST	Severe Thunderstorm Warning	OHX	Robertson	54 min
Mar 20, 1:41 PM CST	Flash Flood Warning	OHX	Stewart	2 hr
Mar 20, 1:41 PM CST	Severe Thunderstorm Warning	OHX	Sumner	34 min
Mar 20, 1:45 PM CST	Severe Thunderstorm Warning	OHX	Houston	60 min
Mar 20, 1:58 PM CST	Severe Thunderstorm Warning	OHX	Montgomery	62 min
Mar 20, 2:07 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Humphreys	38 min
Mar 20, 2:10 PM CST	Severe Thunderstorm Warning	OHX	Dickson, Humphreys	35 min
Mar 20, 2:11 PM CST	Severe Thunderstorm Warning	OHX	Smith, Wilson	49 min
Mar 20, 2:32 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Robertson	43 min
Mar 20, 2:42 PM CST	Severe Thunderstorm Warning	OHX	Davidson, Sumner	33 min
Mar 20, 2:47 PM CST	Severe Thunderstorm Warning	OHX	Williamson	43 min
Mar 20, 2:55 PM CST	Severe Thunderstorm Warning	OHX	Jackson, Overton	35 min
Mar 20, 3:18 PM CST	Severe Thunderstorm Warning	OHX	Fentress	42 min
Mar 20, 3:19 PM CST	Severe Thunderstorm Warning	OHX	Rutherford, Wilson	41 min
Mar 20, 3:50 PM CST	Severe Thunderstorm Warning	OHX	Cannon, DeKalb, Warren	55 min
Mar 20, 4:09 PM CST	Severe Thunderstorm Warning	OHX	White	31 min
Mar 20, 4:29 PM CST	Severe Thunderstorm Warning	OHX	Cumberland	31 min

Nearby

Flash Flood Warnings in Tennessee, 2004 Every flash flood warning in 2004

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.