Alert archive / Louisiana / Flash Flood Warnings in 2016

Flash Flood Warning 48, NWS New Orleans, LA

August 12, 2016Saint Helena Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Aug 12, 2016, 6:21 AM CDT for Saint Helena Parish, Louisiana. It was in force for 3 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
Aug 12, 2016, 6:21 AM CDT (11:21 UTC)
Expired
Aug 12, 2016, 9:15 AM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Emergency
Flash flood emergency
Flood severity
None

County Saint Helena Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.4 hours before the alert went out and 112 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2016-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 872 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2016-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
872 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
528 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
-17 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

As transmitted.

816 
WGUS54 KLIX 121121
FFWLIX
LAC091-121415-
/O.NEW.KLIX.FF.W.0048.160812T1121Z-160812T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
621 AM CDT FRI AUG 12 2016

...FLASH FLOOD EMERGENCY FOR GREENSBURG LOUISIANA...

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL ST. HELENA PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 915 AM CDT

* AT 619 AM CDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED HEAVY RAIN
  AND SIGNIFICANT FLOODING IN AND AROUND GREESBURG IN CENTRAL ST
  HELENA PARISH. SIX TO TEN INCHES OF RAIN HAVE FALLEN. FLASH
  FLOODING IS ALREADY OCCURRING.

  THIS IS A FLASH FLOOD EMERGENCY FOR GREENSBURG AND THE SURROUNDING
 AREA IN CENTRAL ST HELENA PARISH. THIS  IS A PARTICULARLY DANGEROUS
 SITUATION. SEEK HIGHER GROUND NOW! 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GREENSBURG AND DARLINGTON. 

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.

&&

LAT...LON 3089 9057 3072 9057 3075 9080 3090 9080

$$

24/RR
1 follow-up statement
595 
WGUS74 KLIX 121324
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
824 AM CDT FRI AUG 12 2016

LAC091-121415-
/O.CON.KLIX.FF.W.0048.000000T0000Z-160812T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. HELENA LA-
824 AM CDT FRI AUG 12 2016

...THIS IS A FLASH FLOOD EMERGENCY FOR GREENSBURG LOUISIANA AND
SURROUNDING AREAS WITHIN ST HELENA PARISH...

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 AM CDT FOR
EAST CENTRAL ST. HELENA PARISH...

AT 823 AM CDT...HEAVY RAIN AND SIGNIFICANT FLOODING IS ALREADY
OCCURRING. 

THIS IS A FLASH FLOOD EMERGENCY FOR GREENSBURG AND THE SURROUNDING
AREA WITHIN CENTRAL ST HELENA PARISH. THIS IS A PARTICULARLY
DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN THE
WARNED AREA.

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.

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

&&

LAT...LON 3089 9057 3072 9057 3075 9080 3090 9080

$$

24/RR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 7:05 PM CDTSmall Craft AdvisoryLIX12 hr
Aug 11, 9:46 PM CDTSpecial Weather StatementLIXAscension, Livingston59 min
Aug 12, 1:36 AM CDTSpecial Weather StatementLIXSaint Tammany24 min
Aug 12, 1:55 AM CDTSpecial Weather StatementLIXSaint Helena, Tangipahoa65 min
Aug 12, 2:09 AM CDTFlash Flood WarningLIXSaint Helena, Tangipahoa3 hr
Aug 12, 3:33 AM CDTSpecial Weather StatementLIXEast Baton Rouge27 min
Aug 12, 4:16 AM CDTFlash Flood WarningLIXEast Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Feliciana3 hr
Aug 12, 4:23 AM CDTFlash Flood WarningLIXEast Baton Rouge, Livingston, Saint Tammany, Tangipahoa, Washington, West Baton Rouge112 min
Aug 12, 4:32 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville, Jefferson, Lafourche, Livingston and 10 more118 min
Aug 12, 5:06 AM CDTFlash Flood WarningLIXSaint Helena, Tangipahoa3 hr
Aug 12, 5:40 AM CDTSpecial Weather StatementLIXLivingston65 min
Aug 12, 5:41 AM CDTSpecial Weather StatementLIXEast Feliciana64 min
Aug 12, 5:42 AM CDTSpecial Weather StatementLIXEast Feliciana63 min
Aug 12, 6:00 AM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Iberville, Livingston, Pointe Coupee, Saint Tammany and 3 more3 hr
Aug 12, 6:24 AM CDTSpecial Weather StatementLIXJefferson36 min
Aug 12, 6:27 AM CDTRiver Flood WarningLIXSaint Helena44 hr
Aug 12, 6:27 AM CDTSpecial Marine WarningLIX63 min
Aug 12, 6:36 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville, Jefferson, Lafourche, Livingston and 9 more3 hr
Aug 12, 6:44 AM CDTRiver Flood WarningLIXLivingston5 days
Aug 12, 6:44 AM CDTRiver Flood WarningLIXSaint Helena4 days
Aug 12, 6:52 AM CDTRiver Flood WarningLIXTangipahoa49 hr
Aug 12, 7:05 AM CDTFlash Flood WarningLIXAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 6 more6 hr
Aug 12, 7:08 AM CDTSpecial Weather StatementLIXWest Feliciana67 min
Aug 12, 7:12 AM CDTRiver Flood WarningLIXWashington48 hr
Aug 12, 7:31 AM CDTSpecial Weather StatementLIXSaint Tammany29 min
Aug 12, 7:33 AM CDTSpecial Marine WarningLIX57 min
Aug 12, 7:37 AM CDTSpecial Marine WarningLIX38 min
Aug 12, 8:18 AM CDTSpecial Weather StatementLIXEast Baton Rouge, West Baton Rouge57 min
Aug 12, 8:19 AM CDTSpecial Weather StatementLIXWest Feliciana26 min
Aug 12, 9:05 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville, Jefferson, Lafourche, Orleans and 8 more3 hr
Aug 12, 9:14 AM CDTFlash Flood Warning EmergencyLIXSaint Helena, Tangipahoa3 hr
Aug 12, 9:29 AM CDTSpecial Weather StatementLIXWest Feliciana61 min
Aug 12, 9:30 AM CDTRiver Flood WarningLIXEast Baton Rouge53 hr
Aug 12, 9:30 AM CDTRiver Flood WarningLIXAscension, Livingston8 days
Aug 12, 9:36 AM CDTRiver Flood WarningLIXSaint Tammany5 days
Aug 12, 10:05 AM CDTFlash Flood Warning EmergencyLIXEast Baton Rouge, East Feliciana, Pointe Coupee, West Feliciana3 hr
Aug 12, 10:06 AM CDTRiver Flood WarningLIXTangipahoa55 hr
Aug 12, 10:23 AM CDTSpecial Weather StatementLIXPointe Coupee, West Feliciana67 min
Aug 12, 10:42 AM CDTFlash Flood Warning EmergencyLIXEast Baton Rouge, East Feliciana, Saint Helena, West Feliciana3 hr
Aug 12, 10:53 AM CDTRiver Flood WarningLIXTangipahoa3 days
Aug 12, 11:01 AM CDTSpecial Marine WarningLIX59 min
Aug 12, 11:05 AM CDTSpecial Marine WarningLIX55 min
Aug 12, 11:23 AM CDTSpecial Weather StatementLIXPointe Coupee67 min
Aug 12, 11:25 AM CDTRiver Flood WarningLIXSaint Tammany51 hr
Aug 12, 11:25 AM CDTRiver Flood WarningLIXSaint Tammany71 hr
Aug 12, 11:34 AM CDTSmall Craft AdvisoryLIX10 hr
Aug 12, 12:05 PM CDTSpecial Marine WarningLIX55 min
Aug 12, 12:09 PM CDTFlash Flood Warning EmergencyLIXSaint Helena, Tangipahoa3 hr
Aug 12, 12:31 PM CDTSpecial Weather StatementLIXPointe Coupee59 min
Aug 12, 12:57 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 5 more6 hr
Aug 12, 1:21 PM CDTFlash Flood Warning EmergencyLIXEast Baton Rouge, East Feliciana, Saint Helena, West Feliciana114 min
Aug 12, 6:50 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 3 more4 hr

Nearby

Flash Flood Warnings in Louisiana, 2016Every flash flood warning in 2016

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.