Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 2, NWS Lake Charles, LA

March 21, 2015Jefferson County, Texas

NWS Lake Charles, LA issued this flash flood warning at Mar 21, 2015, 10:56 AM CDT for Jefferson County, Texas. It was in force for 109 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 21, 2015, 10:56 AM CDT (15:56 UTC)
Expired: Mar 21, 2015, 12:45 PM CDT
In force: 109 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon
Flood severity: None

County Jefferson County, TX

The radar

The Lake Charles radar (KLCH), 86 km from the middle of the area, began a volume at 15:56 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.9 hours before the alert went out and 88 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: 173 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 533 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

014 
WGUS54 KLCH 211556
FFWLCH
TXC245-211745-
/O.NEW.KLCH.FF.W.0002.150321T1556Z-150321T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1056 AM CDT SAT MAR 21 2015

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN JEFFERSON COUNTY IN SOUTHEAST TEXAS...
  THIS INCLUDES THE CITIES OF...PORT ARTHUR...NEDERLAND...GROVES...
  CENTRAL GARDENS...

* UNTIL 1245 PM CDT

* AT 1048 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  
  FLASH FLOODING FROM A CLUSTER OF THUNDERSTORMS NEAR SOUTHEAST      
  TEXAS REGIONAL AIRPORT...OR NEAR NEDERLAND...MOVING NORTHEAST AT   
  15 MPH. DOPPLER RADAR ESTIMATES SHOW BETWEEN 2 AND 4 INCHES OF     
  RAIN HAS FALLEN OVER PORTIONS OF JEFFERSON COUNTY THE PAST 3 HOURS 
  WITH REPORTS OF WATER ACROSS HIGHWAY 365 AND JIMMY JOHNSON         
  BOULEVARD. AN ADDITIONAL 1 TO 3 INCHES OF RAINFALL IS POSSIBLE FOR 
  THE REMAINDER THROUGH EARLY AFTERNOON.

*  LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PORT      
   NECHES...NEDERLAND AND PORT ACRES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 2995 9428 3005 9405 3004 9403 3003 9403
      3003 9401 2992 9388 2971 9418

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 9:39 PM CDT	Areal Flood Advisory	LCH	Jasper, Newton, Tyler	3 hr
Mar 20, 10:25 PM CDT	Flash Flood Watch	LCH	Hardin, Jasper, Newton, Tyler	18 hr
Mar 21, 10:13 AM CDT	Areal Flood Advisory	LCH	Jefferson	2 hr
Mar 21, 11:06 AM CDT	Areal Flood Advisory	LCH	Jefferson, Orange	114 min
Mar 21, 12:32 PM CDT	Flash Flood Warning	LCH	Jefferson, Orange	88 min
Mar 21, 12:48 PM CDT	Flash Flood Warning	LCH	Jefferson	3 hr
Mar 21, 2:02 PM CDT	Flash Flood Warning	LCH	Jefferson, Orange	3 hr
Mar 21, 3:48 PM CDT	Flash Flood Warning	LCH	Jefferson	117 min
Mar 21, 4:05 PM CDT	River Flood Watch	LCH		10 days
Mar 21, 4:13 PM CDT	Flash Flood Watch	LCH	Hardin, Jasper, Newton, Tyler	5 hr

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.