Alert archive / Texas / Flash Flood Warnings in 2017

Flash Flood Warning 13, NWS Shreveport, LA

June 3, 2017Angelina County, Cherokee County, Nacogdoches County, Texas

NWS Shreveport, LA issued this flash flood warning at Jun 3, 2017, 8:24 PM CDT for Angelina County, Cherokee County, Nacogdoches County, Texas. It was in force for 2 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: Jun 3, 2017, 8:24 PM CDT (01:24 UTC)
Expired: Jun 3, 2017, 10:30 PM CDT
In force: 2 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Angelina County, TX, Cherokee County, TX, Nacogdoches County, TX

The radar

The Shreveport radar (KSHV), 145 km from the middle of the area, began a volume at 01:25 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, 1.4 hours before the alert went out and 153 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: 424 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 524 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 279 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

011 
WGUS54 KSHV 040124
FFWSHV
TXC005-073-347-040330-
/O.NEW.KSHV.FF.W.0013.170604T0124Z-170604T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
824 PM CDT SAT JUN 3 2017

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Northern Nacogdoches County in eastern Texas...
  Northwestern Angelina County in eastern Texas...
  Southeastern Cherokee County in northeastern Texas...

* Until 1030 PM CDT

* At 823 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar is estimating that two to 
  three inches have already fallen in parts of the warned area. 
  Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Nacogdoches, Garrison, Wells, Morrill, Pollok, Forest, Douglass,
  Trawick, Appleby and Central.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3138 9495 3142 9500 3144 9501 3145 9505
      3147 9506 3147 9510 3149 9511 3150 9509
      3153 9511 3154 9514 3156 9514 3184 9470
      3184 9445 3174 9441 3167 9440 3134 9491
      3134 9495

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 7:48 PM CDT	Areal Flood Advisory	SHV	Angelina, Cherokee, Nacogdoches	117 min
Jun 3, 9:35 PM CDT	Special Weather Statement	SHV	Angelina	55 min
Jun 3, 9:58 PM CDT	Special Weather Statement	SHV	San Augustine	47 min
Jun 3, 10:46 PM CDT	Areal Flood Advisory	SHV	Nacogdoches, Sabine, San Augustine, Shelby	119 min
Jun 4, 9:14 AM CDT	Flash Flood Warning	SHV	Bowie, Red River	3 hr
Jun 4, 12:55 PM CDT	River Flood Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	5 days
Jun 4, 12:56 PM CDT	River Flood Warning	SHV	Sabine, San Augustine	25 hr
Jun 4, 12:57 PM CDT	River Flood Warning	SHV	Anderson, Cherokee, Houston	10 days
Jun 4, 1:37 PM CDT	Areal Flood Advisory	SHV	Bowie	3 hr
Jun 4, 1:48 PM CDT	Areal Flood Advisory	SHV	Red River	3 hr
Jun 4, 2:06 PM CDT	Flash Flood Warning	SHV	Red River	3 hr
Jun 4, 2:23 PM CDT	Areal Flood Advisory	SHV	Camp, Franklin, Titus, Upshur, Wood	3 hr
Jun 4, 3:28 PM CDT	Flash Flood Warning	SHV	Smith, Wood	3 hr
Jun 4, 5:26 PM CDT	River Flood Warning	SHV	Gregg	60 hr
Jun 4, 6:31 PM CDT	Flash Flood Warning	SHV	Gregg, Harrison, Rusk, Smith, Upshur	5 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.