Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 39, NWS Shreveport, LA

May 21, 2015Angelina County, Texas

NWS Shreveport, LA issued this flash flood warning at May 21, 2015, 10:54 AM CDT for Angelina County, Texas. It was in force for 4 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 21, 2015, 10:54 AM CDT (15:54 UTC)
Expired: May 21, 2015, 3:00 PM CDT
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

County Angelina County, TX

The radar

The Shreveport radar (KSHV), 147 km from the middle of the area, began a volume at 15:55 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 12:00Z, 3.9 hours before the alert went out and 154 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: 2 J/kg
Mixed-layer CIN: -318 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

221 
WGUS54 KSHV 211554
FFWSHV
TXC005-211800-
/O.NEW.KSHV.FF.W.0039.150521T1554Z-150521T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1054 AM CDT THU MAY 21 2015

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL ANGELINA COUNTY IN EASTERN TEXAS...

* UNTIL 100 PM CDT
    
* AT 1053 AM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. ONGOING FLASH FLOODING IS 
  EXPECTED CONTINUE ACROSS THE AREA. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LUFKIN...DIBOLL...HUDSON...HUNTINGTON...BURKE...ZAVALLA...HOMER AND
  SHAWNEE.

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.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3111 9475 3113 9480 3138 9486 3144 9456
      3143 9455 3140 9454 3141 9450 3138 9447
      3132 9445 3130 9439 3122 9433 3122 9432
      3119 9427 3110 9471

$$

VII

1 follow-up statement

644 
WGUS54 KSHV 211751
FFWSHV
TXC005-212000-
/O.EXT.KSHV.FF.W.0039.000000T0000Z-150521T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1251 PM CDT THU MAY 21 2015

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  CENTRAL ANGELINA COUNTY IN EASTERN TEXAS...

* UNTIL 300 PM CDT
    
* AT 1245 PM CDT...DOPPLER RADAR INDICATED ADDITIONAL SHOWERS WITH 
  MODERATE TO BRIEF HEAVY RAIN...MOVING BACK INTO THE AREA. RAINFALL 
  TOTALS OF 4 TO 6 INCHES HAS OCCURRED ACROSS MUCH OF THE AREA THIS 
  MORNING. CONTINUED FLASH FLOODING MAY OCCUR. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LUFKIN...DIBOLL...HUDSON...HUNTINGTON...BURKE...ZAVALLA...HOMER AND
  SHAWNEE.

ADDITIONAL RAINFALL AMOUNTS OF ONE HALF TO NEAR ONE INCH IS POSSIBLE 
IN THE WARNED AREA.

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.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3111 9475 3113 9480 3138 9486 3144 9456
      3143 9455 3140 9454 3141 9450 3138 9447
      3132 9445 3130 9439 3122 9433 3122 9432
      3119 9427 3110 9471

$$

VII

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:47 PM CDT	River Flood Warning	SHV	Cass, Marion	14 days
May 20, 11:44 PM CDT	Special Weather Statement	SHV	San Augustine	61 min
May 21, 6:00 AM CDT	Special Weather Statement	SHV	Angelina	45 min
May 21, 6:12 AM CDT	Areal Flood Advisory	SHV	Angelina, Cherokee, Nacogdoches	3 hr
May 21, 6:21 AM CDT	Special Weather Statement	SHV	Camp, Cass, Franklin, Marion, Morris, Titus and 1 more	39 min
May 21, 6:57 AM CDT	Flash Flood Warning	SHV	Angelina	3 hr
May 21, 7:05 AM CDT	Special Weather Statement	SHV	Harrison, Marion	55 min
May 21, 8:14 AM CDT	Special Weather Statement	SHV	Gregg, Harrison, Panola, Rusk	46 min
May 21, 8:39 AM CDT	Areal Flood Advisory	SHV	Gregg, Harrison, Panola, Rusk, Shelby	3 hr
May 21, 8:47 AM CDT	Areal Flood Advisory	SHV	Angelina, Nacogdoches, Sabine, San Augustine	3 hr
May 21, 10:09 AM CDT	Areal Flood Advisory	SHV	Angelina, Nacogdoches	3 hr
May 21, 10:18 AM CDT	Areal Flood Advisory	SHV	Sabine	3 hr
May 21, 2:48 PM CDT	Areal Flood Advisory	SHV	Angelina, Nacogdoches, San Augustine	117 min

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.