Alert archive / Tennessee / Flash Flood Warnings in 2012

Flash Flood Warning 4, NWS Morristown, TN

April 3, 2012Campbell County, Tennessee

NWS Morristown, TN issued this flash flood warning at Apr 3, 2012, 4:29 PM EDT for Campbell County, Tennessee. It was in force for 3 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: Apr 3, 2012, 4:29 PM EDT (20:29 UTC)
Expired: Apr 3, 2012, 7:30 PM EDT
In force: 3 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

County Campbell County, TN

The radar

The Knoxville radar (KMRX), 75 km from the middle of the area, began a volume at 20:29 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, 8.5 hours before the alert went out and 218 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: 995 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 894 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

871 
WGUS54 KMRX 032029
FFWMRX
TNC013-032330-
/O.NEW.KMRX.FF.W.0004.120403T2029Z-120403T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
429 PM EDT TUE APR 3 2012

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CAMPBELL COUNTY IN EAST TENNESSEE...
  THIS INCLUDES THE CITY OF LA FOLLETTE...

* UNTIL 730 PM EDT

* AT 424 PM...DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS NEAR 
ROYAL BLUE AND LA FOLLETTE...WHICH HAVE PRODUCED UP TO FOUR INCHES 
OF RAIN IN THE PAST HOUR. ADDITIONAL RAINFALL AMOUNTS AROUND AN INCH 
OR TWO WILL BE POSSIBLE IN THE NEXT COUPLE OF HOURS. RAINFALL OF 
THIS MAGNITUDE WILL LIKELY CAUSE FLOODING OF ROADWAYS AND LOW LYING 
AREAS.

&&

LAT...LON 3647 8395 3630 8399 3631 8433 3639 8433
      3639 8432 3641 8433 3646 8433

$$

DMG

1 follow-up statement

567 
WGUS74 KMRX 032141
FFSMRX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MORRISTOWN TN
541 PM EDT TUE APR 3 2012

TNC013-032330-
/O.CON.KMRX.FF.W.0004.000000T0000Z-120403T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAMPBELL TN-
541 PM EDT TUE APR 3 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM FOR CAMPBELL 
COUNTY...

AT 535 PM...DOPPLER RADAR INDICATED THAT FOUR TO FIVE INCHES OF RAIN 
HAD FALLEN NEAR ROYAL BLUE IN WESTERN CAMPBELL COUNTY. SLOW MOVING 
THUNDERSTORMS CONTINUE OVER WESTERN CAMPBELL COUNTY...WITH ONE TO 
TWO INCHES OF ADDITIONAL RAINFALL POSSIBLE IN THE NEXT HOUR OR TWO. 
RAINFALL OF THIS MAGNITUDE WILL LIKELY CAUSE FLOODING OF ROADWAYS 
AND LOW LYING AREAS.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 3647 8395 3630 8399 3631 8433 3639 8433
      3639 8432 3641 8433 3646 8433

$$

DMG

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 3:08 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	37 min
Apr 3, 4:07 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Jefferson	38 min
Apr 3, 4:10 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	50 min
Apr 3, 4:15 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon	30 min
Apr 3, 4:39 PM EDT	Severe Thunderstorm Warning	MRX	Hawkins	36 min
Apr 3, 4:41 PM EDT	Severe Thunderstorm Warning	MRX	Blount	34 min
Apr 3, 4:54 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Jefferson, Sevier	66 min
Apr 3, 4:56 PM EDT	Areal Flood Advisory	MRX	Grainger	3 hr
Apr 3, 5:16 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Sullivan, Washington	44 min
Apr 3, 5:29 PM EDT	Areal Flood Advisory	MRX	Scott	2 hr
Apr 3, 5:40 PM EDT	Severe Thunderstorm Warning	MRX	Greene	50 min
Apr 3, 6:17 PM EDT	Areal Flood Advisory	MRX	Blount, Sevier	3 hr

Nearby

Flash Flood Warnings in Tennessee, 2012 Every flash flood warning in 2012

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.