Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 21, NWS Shreveport, LA

May 11, 20154 counties in Texas

NWS Shreveport, LA issued this flash flood warning at May 11, 2015, 5:46 AM CDT for 4 counties in Texas. 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: May 11, 2015, 5:46 AM CDT (10:46 UTC)
Expired: May 11, 2015, 8:45 AM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Gregg County, TX, Harrison County, TX, Marion County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 64 km from the middle of the area, began a volume at 10:49 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

Shreveport, LA (KBAD), launched 00:00Z, 10.8 hours before the alert went out and 73 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: 482 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1448 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

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

212 
WGUS54 KSHV 111046
FFWSHV
TXC183-203-315-459-111345-
/O.NEW.KSHV.FF.W.0021.150511T1046Z-150511T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
546 AM CDT MON MAY 11 2015

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HARRISON COUNTY IN NORTHEASTERN TEXAS...
  EAST CENTRAL UPSHUR COUNTY IN NORTHEASTERN TEXAS...
  SOUTHERN MARION COUNTY IN NORTHEASTERN TEXAS...
  EASTERN GREGG COUNTY IN NORTHEASTERN TEXAS...

* UNTIL 845 AM CDT

* AT 545 AM CDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING
  ACROSS THE WARNED AREA. FLASH FLOODING IS ALREADY OCCURRING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LONGVIEW...MARSHALL...HALLSVILLE...JEFFERSON...WOODLAWN...
  HARLETON...LAKEPORT...EASTON...SCOTTSVILLE...NESBITT...JUDSON AND
  DARCO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3276 9473 3280 9420 3239 9413 3237 9441
      3236 9444 3239 9448 3240 9450 3239 9451
      3240 9453 3240 9454 3241 9456 3239 9458
      3236 9460 3237 9464 3237 9478

$$

09

1 follow-up statement

674 
WGUS74 KSHV 111234
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
734 AM CDT MON MAY 11 2015

TXC183-203-315-459-111345-
/O.CON.KSHV.FF.W.0021.000000T0000Z-150511T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARRISON TX-UPSHUR TX-MARION TX-GREGG TX-
734 AM CDT MON MAY 11 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 AM CDT FOR
HARRISON...EAST CENTRAL UPSHUR...SOUTHERN MARION AND EASTERN GREGG
COUNTIES...

AT 730 AM CDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING IN THE 
CITY OF MARSHALL AND THROUGHOUT OTHER PORTIONS OF WESTERN AND 
CENTRAL HARRISON COUNTIES. FLASH FLOODING IS ALREADY OCCURRING. 
RAINFALL HAS ENDED ACROSS THE WARNED AREAS WHICH SHOULD ALLOW FLOOD 
WATERS TO BEGIN TO SLOWLY RECEDE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
LONGVIEW...MARSHALL...HALLSVILLE...JEFFERSON...WOODLAWN...HARLETON...
LAKEPORT...EASTON...SCOTTSVILLE...NESBITT...JUDSON AND DARCO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3276 9473 3280 9420 3239 9413 3237 9441
      3236 9444 3239 9448 3240 9450 3239 9451
      3240 9453 3240 9454 3241 9456 3239 9458
      3236 9460 3237 9464 3237 9478

$$

09

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 9:07 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	53 min
May 10, 9:22 PM CDT	River Flood Warning	SHV	Smith, Wood	7 days
May 10, 9:26 PM CDT	Tornado Warning	SHV	Smith, Wood	29 min
May 10, 10:06 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	39 min
May 10, 10:16 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Upshur, Wood	59 min
May 10, 10:19 PM CDT	Tornado Warning	SHV	Bowie	26 min
May 10, 10:26 PM CDT	Tornado Warning	SHV	Smith, Wood	49 min
May 10, 10:52 PM CDT	Severe Thunderstorm Warning	SHV	Cass, Harrison, Marion	38 min
May 10, 10:59 PM CDT	Tornado Warning	SHV	Harrison, Marion	46 min
May 10, 11:14 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Smith, Upshur, Wood	61 min
May 10, 11:22 PM CDT	Tornado Warning	SHV	Cass, Marion	38 min
May 10, 11:38 PM CDT	Tornado Warning	SHV	Bowie, Red River, Titus	37 min
May 10, 11:39 PM CDT	Flash Flood Warning	SHV	Smith, Upshur, Wood	4 hr
May 10, 11:46 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	44 min
May 10, 11:58 PM CDT	Tornado Warning	SHV	Bowie, Cass	36 min
May 11, 12:07 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Marion, Morris, Titus and 1 more	53 min
May 11, 12:25 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Rusk, Smith, Upshur, Wood	65 min
May 11, 12:36 AM CDT	Flash Flood Warning	SHV	Bowie, Red River	4 hr
May 11, 12:41 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee	64 min
May 11, 12:46 AM CDT	Tornado Warning	SHV	Bowie	15 min
May 11, 12:53 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Morris	52 min
May 11, 12:59 AM CDT	Severe Thunderstorm Warning	SHV	Cass, Gregg, Harrison, Marion, Morris, Panola and 2 more	46 min
May 11, 1:03 AM CDT	Tornado Warning	SHV	Bowie	27 min
May 11, 1:19 AM CDT	Tornado Warning	SHV	Cherokee, Rusk, Smith	41 min
May 11, 1:19 AM CDT	Tornado Warning	SHV	Bowie	26 min
May 11, 1:42 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	48 min
May 11, 1:47 AM CDT	Severe Thunderstorm Warning	SHV	Cass, Harrison, Marion, Rusk	43 min
May 11, 1:51 AM CDT	Flash Flood Warning Emergency	SHV	Gregg, Harrison, Marion, Upshur	4 hr
May 11, 1:59 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Panola, Rusk	61 min
May 11, 2:05 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Smith	40 min
May 11, 2:44 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion	61 min
May 11, 2:52 AM CDT	Special Weather Statement	SHV	Cherokee	38 min
May 11, 2:58 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Harrison, Panola, Rusk	47 min
May 11, 3:05 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Rusk	55 min
May 11, 3:14 AM CDT	Flash Flood Warning	SHV	Cherokee, Rusk	4 hr
May 11, 3:31 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Nacogdoches, Panola, Rusk, Shelby	59 min
May 11, 3:45 AM CDT	Areal Flood Warning	SHV	Smith, Upshur, Wood	3 hr
May 11, 4:19 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches	56 min
May 11, 4:31 AM CDT	Areal Flood Warning	SHV	Bowie, Cass	3 hr
May 11, 5:26 AM CDT	River Flood Warning	SHV	Gregg	56 hr
May 11, 5:59 AM CDT	River Flood Warning	SHV	Cherokee, Nacogdoches, Rusk, Smith	67 hr
May 11, 10:50 AM CDT	River Flood Warning	SHV	Cass, Harrison, Marion	4 days
May 11, 10:53 AM CDT	River Flood Warning	SHV	Gregg, Smith, Upshur, Wood	5 days
May 11, 10:53 AM CDT	River Flood Warning	SHV	Gregg, Rusk	7 days
May 11, 10:53 AM CDT	River Flood Warning	SHV	Gregg, Harrison, Panola, Rusk	8 days

Nearby

Flash Flood Warnings in Texas, 2015 Every flash flood warning in 2015

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.