Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 39, NWS Shreveport, LA

September 30, 20125 counties in Texas

NWS Shreveport, LA issued this flash flood warning at Sep 30, 2012, 2:01 AM CDT for 5 counties in Texas. It was in force for 4 hr. 4 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
Sep 30, 2012, 2:01 AM CDT (07:01 UTC)
Expired
Sep 30, 2012, 6:00 AM CDT
In force
4 hr
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Flood severity
None

Counties Angelina County, TX, Nacogdoches County, TX, Panola County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 109 km from the middle of the area, began a volume at 07:02 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
Sep 30, 2:08 AM CDTFLASH FLOOD5 W Nacogdoches, TXBRIDGE WASHED OUT WEST OF TOWN.
Sep 30, 2:30 AM CDTFLASH FLOODNacogdoches, TXSPOTTER REPORTS PRESS ROAD IS IMPASSABLE AT THIS TIME...WITH NEARLY 2 FEET OF WATER COVERING IT.
Sep 30, 4:03 AM CDTHEAVY RAIN 8.244 Nw Appleby, TXTOTAL RAINFALL SO FAR AT RAWS LOCATION. RAIN BEGAN FALLING AT APPROXIMATELY 9 AM CDT SATURDAY. RAIN STILL FALLING.
Sep 30, 4:11 AM CDTHEAVY RAIN 5.154 Ssw Huxley, TXTOTAL RAINFALL SO FAR AT RAWS LOCATION. RAIN BEGAN FALLING AT APPROXIMATELY 9 AM CDT SATURDAY. RAIN IS STILL FALLING.

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

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 7.0 hours before the alert went out and 117 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, Shreveport, LA at 00:00Z on 2012-09-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2012-09-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
578 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
273 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.

873 
WGUS54 KSHV 300701
FFWSHV
TXC005-347-365-405-419-301100-
/O.NEW.KSHV.FF.W.0039.120930T0701Z-120930T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
201 AM CDT SUN SEP 30 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN ANGELINA COUNTY IN EASTERN TEXAS...
  THIS INCLUDES THE CITY OF LUFKIN...
  NACOGDOCHES COUNTY IN EASTERN TEXAS...
  THIS INCLUDES THE CITY OF NACOGDOCHES...
  NORTHERN SAN AUGUSTINE COUNTY IN EASTERN TEXAS...
  SHELBY COUNTY IN EASTERN TEXAS...
  THIS INCLUDES THE CITY OF CENTER...
  SOUTHEASTERN PANOLA COUNTY IN NORTHEAST TEXAS...

* UNTIL 600 AM CDT

* AT 157 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  VERY HEAVY RAIN CONTINUING ACROSS WARNED AREA. RAINFALL RATES    
  NEAR ONE TO TWO INCHES PER HOUR WILL CONTINUE TO BE POSSIBLE ACROSS
  THE WARNED AREA IN ADDITION TO WHAT HAS ALREADY FALLEN. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO TRAWICK...
  TIMPSON...TENAHA...SHELBYVILLE...SACUL...PATROON...NEUVILLE...
  MELROSE...MARTINSVILLE...JOAQUIN...GARRISON...DOUGLASS AND BLAND
  LAKE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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 3126 9491 3132 9491 3142 9501 3152 9487
      3164 9495 3175 9497 3176 9493 3179 9497
      3184 9493 3185 9446 3197 9453 3223 9405
      3200 9404 3189 9390 3170 9380 3159 9383
      3161 9390 3157 9399 3153 9399 3122 9486

$$

13

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 29, 10:18 PM CDTFlash Flood WarningSHVAngelina, Cherokee, Nacogdoches, San Augustine, Shelby4 hr
Sep 30, 3:56 AM CDTLake Wind AdvisorySHVAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more12 hr
Sep 30, 4:47 AM CDTRiver Flood WarningSHVNacogdoches, Panola, Rusk, San Augustine, Shelby4 days
Sep 30, 4:49 AM CDTRiver Flood WarningSHVSabine, San Augustine32 hr
Sep 30, 9:31 AM CDTRiver Flood WarningSHVAngelina, Cherokee, Nacogdoches5 days

Nearby

Flash Flood Warnings in Texas, 2012Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.