Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS Shreveport, LA

March 20, 20124 parishes in Louisiana; Sabine County, Texas

NWS Shreveport, LA issued this flash flood warning at Mar 20, 2012, 8:55 PM CDT for 4 parishes in Louisiana; Sabine County, Texas. It was in force for 10 hr. 19 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: Mar 20, 2012, 8:55 PM CDT (01:55 UTC)
Expired: Mar 21, 2012, 6:45 AM CDT
In force: 10 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Emergency: Flash flood emergency
Flood severity: None

Counties Grant Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA, Winn Parish, LA, Sabine County, TX

What was reported inside it

Time	Report	Where	Remark
Mar 20, 9:00 PM CDT	FLASH FLOOD	9 Ese Florien, LA	WATER COVERING HWY 118 NEAR PEASON
Mar 20, 9:58 PM CDT	FLASH FLOOD	5 S Provencal, LA	A 20 FOOT SPAN OF WATER WAS REPORTED TO BE OVER HWY. 117 BETWEEN PROVENCAL AND BELLWOOD.
Mar 20, 10:00 PM CDT	FLASH FLOOD	1 Ne Pineland, TX	PARTS OF HWY 83 COVERED WITH WATER NEAR PINELAND
Mar 20, 10:00 PM CDT	FLASH FLOOD	3 Sw Hemphill, TX	WATER COVERING SPRINGHILL CEMETARY ROAD NEAR HWY 83
Mar 20, 10:10 PM CDT	FLASH FLOOD	1 N Zwolle, LA	WATER COVERING OLD PLEASANT HILL ROAD NEAR ZWOLLE
Mar 20, 10:10 PM CDT	FLASH FLOOD	8 N Many, LA	WATER COVERING HWY 175 NEAR BELMONT
Mar 20, 10:10 PM CDT	FLASH FLOOD	Many, LA	WATER COVERING PARTS OF HWY 171 IN MANY
Mar 20, 11:38 PM CDT	FLASH FLOOD	Natchitoches, LA	ROYAL, TEXAS STREET UNDERPASS FLOODED. ISADORE STREET FLOODED. BARACADES SET UP ON BIENVILLE STREET NEAR NATCHITOCHES REGIONAL HOSPITAL.
Mar 20, 11:44 PM CDT	FLASH FLOOD	Natchitoches, LA	ROYAL STREET AT BEAUFORT BOULEVARD IS FLOODED AND BARRICADED.
Mar 21, 12:16 AM CDT	FLASH FLOOD	Natchitoches, LA	PAULA LANE BARRICADED AND CLOSED FROM FLOOD WATERS.
Mar 21, 12:32 AM CDT	FLASH FLOOD	9 S Robeline, LA	COX LANE NEAR VOWELLS MILLS IS UNDERWATER AND FLOODED. DOTD HAS NO MORE BARRICADES TO PUT OUT ACROSS THE PARISH.
Mar 21, 12:51 AM CDT	FLASH FLOOD	2 Ne Robeline, LA	HWY. 485 OFF LA. HWY. 6 FLOODED.
Mar 21, 1:18 AM CDT	FLASH FLOOD	Natchitoches, LA	BOSSIER STREET IS BARRICADED AND CLOSED DUE TO HIGH WATER.
Mar 21, 1:30 AM CDT	FLASH FLOOD	Natchitoches, LA	SEVERAL REPORTS OF FLOODED VEHICLES THROUGHOUT THE CITY. THE CANE RIVER IN DOWNTOWN NATCHITOCHES IS NEAR ONE INCH FROM TOPPING THE RETAINING WALL.
Mar 21, 2:45 AM CDT	FLASH FLOOD	Natchitoches, LA	WATER GOING INTO HOME OUTSIDE CITY OF NATCHITOCHES ON MICHELE DRIVE.
Mar 21, 3:29 AM CDT	FLASH FLOOD	10 Sw Natchitoches, LA	HIGH WATER ON HWY 117 NEAR KISATCHIE NATIONAL FOREST RANGER STATION
Mar 21, 3:43 AM CDT	FLASH FLOOD	Natchitoches, LA	THE CANE RIVER NEAR THE ROGUE HOUSE AREA HAS TOPPED THE CITYS RETAINING WALL BY A FEW INCHES.
Mar 21, 4:39 AM CDT	FLASH FLOOD	Campti, LA	HIGH WATER COVERED THE ROAD NEAR HWY. 480 NEAR CAMPTI.
Mar 21, 6:45 AM CDT	HEAVY RAIN 10.19	10 Sse Provencal, LA	MEASURED 10.19 RAINFALL AT KISATCHIE RANGER STATION 24 HOUR-OBSERVATION ENDING AT 6 AM MARCH 21 2010.

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

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 1.9 hours before the alert went out and 314 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: 267 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

545 
WGUS54 KSHV 210155
FFWSHV
LAC043-069-085-127-TXC403-210745-
/O.NEW.KSHV.FF.W.0013.120321T0155Z-120321T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
855 PM CDT TUE MAR 20 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SABINE COUNTY IN EASTERN TEXAS...
  GRANT PARISH IN NORTH CENTRAL LOUISIANA...
  WINN PARISH IN NORTH CENTRAL LOUISIANA...
  THIS INCLUDES THE CITY OF WINNFIELD...
  NATCHITOCHES PARISH IN NORTHWEST LOUISIANA...
  THIS INCLUDES THE CITY OF NATCHITOCHES...
  SABINE PARISH IN NORTHWEST LOUISIANA...

* UNTIL 245 AM CDT

* AT 855 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  VERY HEAVY RAIN FROM SHOWERS AND EMBEDDED THUNDERSTORMS OVER THE WARNED 
  AREA. SURFACE REPORTS AND RADAR ESTIMATES INDICATE THAT MUCH OF THE WARNED 
  AREA HAS RECEIVED THREE TO IN EXCESS OF FIVE INCHES OF RAIN THIS AFTERNOON
  AND EVENING...WHICH HAS FALLEN OVER ALREADY SATURATED GROUNDS. NUMEROUS 
  ROADS ACROSS NATCHITOCHES...WINN...GRANT PARISHES ARE FLOODED AND 
  CLOSED...AND WATER HAS ENTERED HOMES NEAR NATCHITOCHES. ADDITIONAL
  SHOWERS AND THUNDERSTORMS CONTAINING HEAVY RAINFALL WILL CONTINUE TO DEVELOP 
  AND SPREAD NORTH ACROSS THE WARNED AREA OVERNIGHT...FURTHER ENHANCING THE 
  FLASH FLOOD THREAT. THIS IS AN EXTREMELY DANGEROUS SITUATION! TRAVEL IS 
  STRONGLY DISCOURAGED TONIGHT!

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROSEVINE...
  GENEVA...ZWOLLE...MONTGOMERY...MANY...CONVERSE...COLFAX AND
  CAMPTI...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF TWO TO FIVE INCHES ARE POSSIBLE IN
THE WARNED AREA THROUGH 245 AM.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3114 9405 3157 9398 3161 9390 3159 9384
      3168 9380 3184 9387 3184 9345 3194 9342
      3189 9327 3197 9323 3198 9313 3214 9315
      3214 9231 3170 9237 3144 9235 3138 9266
      3151 9272 3134 9295 3136 9338 3116 9358

$$

15

2 follow-up statements

824 
WGUS74 KSHV 210438
FFSSHV

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1138 PM CDT TUE MAR 20 2012

LAC043-069-085-127-TXC403-210745-
/O.CON.KSHV.FF.W.0013.000000T0000Z-120321T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SABINE TX-SABINE LA-NATCHITOCHES LA-GRANT LA-WINN LA-
1138 PM CDT TUE MAR 20 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
SABINE COUNTY...AND WINN...GRANT...NATCHITOCHES AND SABINE
PARISHES...

...A FLASH FLOOD EMERGENCY FOR NATCHITOCHES PARISH INCLUDING THE CITY 
OF NATCHITOCHES...

AT 1138 PM CDT...LOCAL LAW ENFORCEMENT AND EMERGENCY MANAGEMENT 
OFFICIALS REPORTED WIDESPREAD FLASH FLOODING FROM SHOWERS AND 
EMBEDDED THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE WARNED 
AREA. SURFACE REPORTS AND RADAR ESTIMATES INDICATE THAT RAINFALL 
AMOUNTS OF THREE TO FIVE INCHES HAS FALLEN THIS AFTERNOON AND 
EVENING ACROSS THE WARNED AREA...WITH HIGHER AMOUNTS OF SEVEN TO 
NEARLY EIGHT INCHES ACROSS EXTREME SOUTHEAST SABINE PARISH...AS WELL 
AS SOUTHERN NATCHITOCHES PARISH. NUMEROUS ROADS ARE FLOODED AND 
CLOSED...WITH WATER ENTERING HOMES NEAR NATCHITOCHES. ADDITIONAL 
SHOWERS AND EMBEDDED THUNDERSTORMS CONTAINING HEAVY RAINFALL WILL 
CONTINUE TO MOVE NORTH ACROSS THE WARNED AREA FROM SOUTHEAST TEXAS 
AND SOUTHWEST LOUISIANA THROUGHOUT THE OVERNIGHT HOURS...THUS ONLY 
AGGRAVATING THE ONGOING FLASH FLOODING. THIS IS AN EXTREMELY 
DANGEROUS AND LIFE THREATENING SITUATION! TRAVEL IS STRONGLY 
DISCOURAGED TONIGHT! 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WINNFIELD...
NATCHITOCHES...MONTGOMERY...CONVERSE AND CAMPTI

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE POSSIBLE IN
THE WARNED AREA THROUGH 245 AM. HOWEVER...ISOLATED HIGHER AMOUNTS NEARING 
FOUR INCHES WILL BE POSSIBLE ACROSS CENTRAL AND SOUTHERN NATCHITOCHES 
PARISH...AS VERY HEAVY RAINFALL CONTINUES TO TRAIN OVER THE SAME AREAS. 

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3114 9405 3157 9398 3161 9390 3159 9384
      3168 9380 3184 9387 3184 9345 3194 9342
      3189 9327 3197 9323 3198 9313 3214 9315
      3214 9231 3170 9237 3144 9235 3138 9266
      3151 9272 3134 9295 3136 9338 3116 9358

$$

15

926 
WGUS54 KSHV 210742
FFWSHV
LAC043-069-085-127-TXC403-211145-
/O.EXT.KSHV.FF.W.0013.000000T0000Z-120321T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
242 AM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SABINE COUNTY IN EASTERN TEXAS...
  GRANT PARISH IN NORTH CENTRAL LOUISIANA...
  WINN PARISH IN NORTH CENTRAL LOUISIANA...
  THIS INCLUDES THE CITY OF WINNFIELD...
  NATCHITOCHES PARISH IN NORTHWEST LOUISIANA...
  THIS INCLUDES THE CITY OF NATCHITOCHES...
  SABINE PARISH IN NORTHWEST LOUISIANA...

* UNTIL 645 AM CDT

* AT 225 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED 
TO DETECT WIDESPREAD HEAVY RAIN FROM SHOWER AND THUNDERSTORM 
ACTIVITY PASSING OVER THE WARNED AREA. LOCAL LAW ENFORCEMENT AND 
EMERGENCY MANAGEMENT OFFICIALS CONTINUE TO RELAY REPORTS OF FLASH 
FLOODING OVER THE WARNED AREA. SURFACE REPORTS AND RADAR ESTIMATES 
INDICATE THAT RAINFALL AMOUNTS OF FOUR TO SIX INCHES HAS FALLEN 
ACROSS THE WARNED AREA...WITH HIGHER AMOUNTS OF SEVEN TO NINE EIGHT 
INCHES ACROSS NATCHITOCHES PARISH. NUMEROUS ROADS ARE FLOODED AND 
CLOSED...WITH WATER ENTERING HOMES IN NATCHITOCHES. ADDITIONAL HEAVY 
RAINFALL WILL CONTINUE TO MOVE ACROSS THE WARNED AREA THROUGH THE 
WEE HOURS OF THE MORNING AND INTO DAYBREAK...THUS ONLY AGGRAVATING 
THE ONGOING FLASH FLOODING. THIS IS AN EXTREMELY DANGEROUS AND LIFE 
THREATENING SITUATION! TRAVEL IS STRONGLY DISCOURAGED THIS MORNING!

  THIS IS A FLASH FLOOD EMERGENCY FOR NATCHITOCHES PARISH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ZWOLLE...
  MONTGOMERY...MANY...CONVERSE AND CAMPTI...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE POSSIBLE IN 
THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3114 9405 3157 9398 3161 9390 3159 9384
      3168 9380 3184 9387 3184 9345 3194 9342
      3189 9327 3197 9323 3198 9313 3214 9315
      3214 9231 3170 9237 3144 9235 3138 9266
      3151 9272 3134 9295 3136 9338 3116 9358

$$

ELEVEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 9:02 PM CDT	River Flood Warning	SHV	Bienville, Bossier, Red River, Webster	11 days
Mar 20, 9:03 PM CDT	Tornado Warning	SHV	Natchitoches	27 min
Mar 20, 9:15 PM CDT	Flash Flood Warning	SHV	Bienville, De Soto, Red River	9 hr
Mar 20, 9:24 PM CDT	Tornado Warning	SHV	Natchitoches	36 min
Mar 20, 10:20 PM CDT	Tornado Warning	SHV	Grant, Natchitoches	40 min
Mar 20, 10:50 PM CDT	Flash Flood Warning	SHV	Bossier, Claiborne, Webster	10 hr
Mar 21, 1:52 AM CDT	Flash Flood Warning	SHV	Bienville, Jackson, Lincoln, Union	8 hr
Mar 21, 2:49 AM CDT	Tornado Warning	SHV	Grant, Winn	26 min
Mar 21, 3:14 AM CDT	Tornado Warning	SHV	Jackson, Winn	46 min
Mar 21, 5:41 AM CDT	Tornado Warning	SHV	Jackson, Winn	34 min
Mar 21, 6:16 AM CDT	Flash Flood Warning	SHV	Bienville, Red River	3 hr
Mar 21, 6:47 AM CDT	Flash Flood Warning Emergency	SHV	Grant, Natchitoches, Red River, Sabine, Winn	4 hr
Mar 21, 8:44 AM CDT	Flash Flood Warning	SHV	Claiborne	2 hr
Mar 21, 9:36 AM CDT	Flash Flood Warning	SHV	Union	114 min
Mar 21, 10:51 AM CDT	Flash Flood Warning Emergency	SHV	Grant, Natchitoches, Winn	3 hr
Mar 21, 1:53 PM CDT	Areal Flood Warning	SHV	Natchitoches	6 hr
Mar 20, 7:28 PM CDT	River Flood Warning	SHV	Sabine, San Augustine	38 hr
Mar 21, 9:11 AM CDT	River Flood Warning	SHV	Anderson, Cherokee, Houston	23 hr

Nearby

Flash Flood Warnings in Louisiana, 2012 Flash Flood Warnings in Texas, 2012 Every flash flood warning in 2012

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.