Alert archive / Texas / Flash Flood Warnings in 2017

Flash Flood Warning 79, NWS Lake Charles, LA

August 29, 20175 counties in Texas

NWS Lake Charles, LA issued this flash flood warning at Aug 29, 2017, 10:16 PM CDT for 5 counties in Texas. It was in force for 11 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: Aug 29, 2017, 10:16 PM CDT (03:16 UTC)
Expired: Aug 30, 2017, 9:15 AM CDT
In force: 11 hr
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Emergency: Flash flood emergency
Flood severity: None

Counties Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX

The radar

The Lake Charles radar (KLCH), 80 km from the middle of the area, began a volume at 03:18 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

Time	Report	Where	Remark
Aug 30, 2:21 AM CDT	FLASH FLOOD	Port Arthur, TX	BROADCAST MEDIA POSTED PHOTOS OF FLOODING INSIDE THE PORT ARTHUR CIVIC CENTER.
Aug 30, 6:35 AM CDT	FLASH FLOOD	Southeast Texas Regiona, TX	CWSU RELAYED REPORT OF STANDING WATER AT AND SURROUNDING KBPT AIRPORT.
Aug 30, 7:01 AM CDT	FLASH FLOOD	Port Arthur, TX	NUMEROUS WATER RESCUES HAVE BEEN UNDERWAY DURING THE NIGHT AND CONTINUE THROUGH THE COUNTY, ESPECIALLY IN THE PORT ARTHUR AREA.
Aug 30, 7:01 AM CDT	FLASH FLOOD	Sour Lake, TX	NUMEROUS WATER RESCUES HAVE BEEN TAKING PLACE OVERNIGHT AND CONTINUE THROUGH THE COUNTY, ESPECIALLY IN THE SOUR LAKE, BATSON AND SARATOGA AREAS.

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

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.3 hours before the alert went out and 82 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: 888 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

356 
WGUS54 KLCH 300316
FFWLCH
TXC199-241-245-351-361-300915-
/O.NEW.KLCH.FF.W.0079.170830T0316Z-170830T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
1016 PM CDT TUE AUG 29 2017

...FLASH FLOOD EMERGENCY FOR JEFFERSON...ORANGE and HARDIN 
COUNTIES...

The National Weather Service in Lake Charles has issued a

* Flash Flood Warning for...
  Jefferson County in southeastern Texas...
  Southwestern Newton County in southeastern Texas...
  Hardin County in southeastern Texas...
  Orange County in southeastern Texas...
  Southeastern Jasper County in southeastern Texas...

* Until 415 AM CDT

* At 1015 PM CDT,Doppler radar continued to indicate a nearly 
  stationary area of heavy rains impacting the warned area. 
  Widespread flooding is already occurring. High resolution forecast 
  guidance indicates another 10 to 15 inches of rain is possible 
  over the remainder of the night. This is a PARTICULARLY DANGEROUS 
  SITUATION. SEEK HIGHER GROUND NOW!

* Some locations that will experience flooding include...
  Beaumont, Port Arthur, Orange, Nederland, Groves, Port Neches,
  Lumberton, Vidor, Bridge City, Silsbee, West Orange, Kountze, Sour
  Lake, Nome, Deweyville, Evadale, Central Gardens, Sabine Pass,
  Thicket and Saratoga.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3049 9473 3052 9371 3044 9370 3039 9376
      3033 9376 3029 9371 3008 9373 3006 9370
      3006 9372 3000 9377 2998 9387 2981 9395
      2968 9385 2967 9405 2956 9435 2989 9436
      2989 9444 3011 9445 3011 9460

$$

25

1 follow-up statement

126 
WGUS54 KLCH 300911
FFWLCH
TXC199-241-245-351-361-301415-
/O.EXT.KLCH.FF.W.0079.000000T0000Z-170830T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lake Charles LA
411 AM CDT WED AUG 30 2017

...FLASH FLOOD EMERGENCY FOR JEFFERSON HARDIN AND ORANGE COUNTIES...

The National Weather Service in Lake Charles has extended the

* Flash Flood Warning for...
  Jefferson County in southeastern Texas...
  Southwestern Newton County in southeastern Texas...
  Hardin County in southeastern Texas...
  Orange County in southeastern Texas...
  Southeastern Jasper County in southeastern Texas...

* Until 915 AM CDT

* At 408 AM CDT, Doppler radar indicated heavy rain across the warned
  area. Flash flooding is already occurring.

  This is a FLASH FLOOD EMERGENCY for the counties of Hardin, 
Jefferson, and Orange Counties. This is a PARTICULARLY DANGEROUS 
SITUATION. SEEK HIGHER GROUND NOW! 

* Some locations that will experience flooding include...
  Beaumont, Port Arthur, Orange, Nederland, Groves, Port Neches,
  Lumberton, Vidor, Bridge City, Silsbee, West Orange, Kountze, Sour
  Lake, Nome, Deweyville, Evadale, Central Gardens, Sabine Pass,
  Thicket and Saratoga.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area with up to 4 inches possible in eastern Orange County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3049 9473 3052 9371 3044 9370 3039 9376
      3033 9376 3029 9371 3008 9373 3006 9370
      3006 9372 3000 9377 2998 9387 2981 9395
      2968 9385 2967 9405 2956 9435 2989 9436
      2989 9444 3011 9445 3011 9460

$$

Rua

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 7:24 PM CDT	Flash Flood Warning	LCH	Jasper, Newton	6 hr
Aug 29, 10:22 PM CDT	Flash Flood Warning	LCH	Jasper, Newton	11 hr
Aug 29, 11:10 PM CDT	Flash Flood Warning	LCH	Hardin, Jasper, Tyler	10 hr
Aug 29, 11:29 PM CDT	Wind Advisory	LCH	Hardin, Jasper, Newton, Tyler	20 hr
Aug 30, 8:40 AM CDT	Flash Flood Warning Emergency	LCH	Hardin, Jasper, Jefferson, Newton, Orange, Tyler	24 hr

Nearby

Flash Flood Warnings in Texas, 2017 Every flash flood warning in 2017

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.