Alert archive / Louisiana / Flash Flood Warnings in 2016

Flash Flood Warning 14, NWS New Orleans, LA

March 11, 2016Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 11, 2016, 8:04 PM CST for Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana. It was in force for 8 hr. 2 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 11, 2016, 8:04 PM CST (02:04 UTC)
Expired: Mar 12, 2016, 4:00 AM CST
In force: 8 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 11, 8:11 PM CST	FLOOD	Folsom, LA	ESTIMATES FROM ST TAMMANY FIRE DISTRIC 5 OF 100 PEOPLE RESCUED FROM PARK LANE AND 50-60 FROM ALBERT THOMPSON THROUGH THE DAY. REPORT RELAYED VIA SOCIAL MEDIA.
Mar 11, 8:15 PM CST	FLOOD	3 Nne Covington, LA	WATER BEGINNING TO ENTER HOMES IN MAGNOLIA GARDENS IN COVINGTON. RELATED TO BOGUE FALAYA RIVER.

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

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.1 hours before the alert went out and 55 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: 36 J/kg
Mixed-layer CIN: -410 J/kg
Mixed-layer LCL: 1269 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

147 
WGUS54 KLIX 120204
FFWLIX
LAC103-105-117-121000-
/O.NEW.KLIX.FF.W.0014.160312T0204Z-160312T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
804 PM CST FRI MAR 11 2016

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WASHINGTON PARISH IN SOUTHEASTERN LOUISIANA...
  NORTHWESTERN ST. TAMMANY PARISH IN SOUTHEASTERN LOUISIANA...
  TANGIPAHOA PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 400 AM CST SATURDAY
    
* AT 801 PM CST...FLOODING CONTINUES ACROSS THE WARNED AREA. BETWEEN
  10 TO 17 INCHES HAVE FALLEN IN THE WARNED AREA TODAY. MANY ROADS
  ARE IMPASSABLE AND FLOOD WATERS REMAIN ELEVATED...ESPECIALLY NEAR
  CREEKS AND RIVERS. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN
  EXTENDED THROUGH THE OVERNIGHT HOURS. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  HAMMOND...BOGALUSA...COVINGTON...FRANKLINTON...AMITE...
  PONCHATOULA...AMITE CITY...ABITA SPRINGS...KENTWOOD...
  INDEPENDENCE...VARNADO...ROSELAND...MADISONVILLE...FOLSOM...
  SPRINGFIELD...SUN...OSYKA...ROBERT...BUSH AND ENON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3085 8978 3085 8979 3082 8978 3078 8983
      3074 8982 3073 8984 3065 8985 3038 9017
      3039 9020 3037 9024 3030 9030 3028 9037
      3030 9043 3031 9042 3037 9050 3049 9057
      3100 9057 3100 8973

$$

11

1 follow-up statement

304 
WGUS74 KLIX 120959
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
359 AM CST SAT MAR 12 2016

LAC103-105-117-121006-
/O.EXP.KLIX.FF.W.0014.000000T0000Z-160312T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON LA-ST. TAMMANY LA-TANGIPAHOA LA-
359 AM CST SAT MAR 12 2016

...THE FLASH FLOOD WARNING FOR WASHINGTON...NORTHWESTERN ST. TAMMANY
AND TANGIPAHOA PARISHES WILL EXPIRE AT 400 AM CST...

FLOOD WATERS HAVE BEEN SLOWLY RECEDING IN MOST AREAS...HOWEVER
MAJOR RIVER FLOODING AND BACK WATER FROM THESE RIVERS WILL RESULT IN
AREAS OF FLOODING. AN AREAL FLOOD WARNING WILL REPLACE THE FLASH
FLOOD WARNING. PLEASE CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 3085 8978 3085 8979 3082 8978 3078 8983
      3074 8982 3073 8984 3065 8985 3038 9017
      3039 9020 3037 9024 3030 9030 3028 9037
      3030 9043 3031 9042 3037 9050 3049 9057
      3100 9057 3100 8973

$$

TD

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this flash flood warning went out at Mar 11, 4:12 PM CST, 3 hours 52 minutes earlier.

Area forecast discussion, Mar 11, 4:12 PM CST, 3 hours 52 minutes before

AREA FORECAST DISSCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
412 PM CST FRI MAR 11 2016

.SHORT TERM...
BUSY DAY AT THE FORECAST OFFICE TODAY AS A HISTORIC RAIN EVENT IS
ONGOING ACROSS PORTIONS OF THE FORECAST AREA. HISTORIC RIVER
FLOODING IS ONGOING ON MANY RIVERS ON THE NORTHSHORE WHERE 12 PLUS INCHES
OF RAIN HAS FALLEN ACROSS PORTIONS OF TANIGIPAHOA...ST TAMMANY
AND WASHINGTON PARISHES OVER THE LAST 24 HOURS. THE GOOD NEWS IS
THAT TONIGHT WE SHOULD CATCH A BREAK. LATEST RADAR AND HI RES
MODEL TREND SUGGEST THAT RAINFALL IS SLOWLY MOVING TO THE EAST AND
IS COMING TO AN END...FOR NOW. POPS IN THE FORECAST WILL REMAIN
HIGH EVENTHOUGH A BREAK IS EXPECTED TONIGHT. I EXPECT FINAL ROUND
OF SHOWERS AND THUNDERSTORMS TO DEVELOP BY LATE SATURDAY MORNING
INTO SATURDAY AFTERNOON AS THE PESKY UPPER LOW FINALLY MAKES ITS
FINAL PUSH NORTHEAST OUT OF OUR AREA. EXPECT AN ADDITIONAL INCH OR
TWO WITH THE FINAL PUSH TOMORROW. THE SHORTWAVE ENTERING THE WEST
COAST THAT WILL SERVE AS THE KICKER TO THE UPPER LOW WILL MOVE
ACROSS THE AREA SUNDAY NIGHT WITH COMPARATIVELY LITTLE MOISTURE TO
WORK WITH IN OUR AREA BUT AREAS TO THE NORTH OF OUR AREA COULD SEE
ANOTHER SHOT OF RAIN. WE HAVE A DRY FORECAST FOR OUR ENTIRE AREA
FOR SUNDAY. WHILE TEMPERATURES SATURDAY WILL BE HELD TO THE 70 TO
75 RANGE...SUNSHINE ON SUNDAY WILL ALLOW TEMPERATURE TO RISE TO
NEAR THE 80 DEGREE MARK. 13MH

.LONG TERM...
BEYOND SUNDAY NOT MUCH HAS CHANGED IN THE FORECAST AS SPRING
ARRIVES WITH TEMPERATURES IN THE LOW TO POSSIBLY MID 80S FOR THE
FIRST HALF OF THE WEEK AS HIGH PRESSURE BUILDS IN. NO RAINFALL IS
EXPECTED THROUGH THE FIRST HALF OF THE WEEK. MODELS STILL INDICATE
THE NEXT CHANCE OF ORGANIZED RAINFALL LOOKS TO MOVE IN AROUND THE
THURSDAY TIMEFRAME. HAVE WENT WITH A BLENDED APPROACH IN THE LONG
RANGE AND KEEP POPS IN THE THURSDAY/FRIDAY TIMEFRAME. 13/MH

&&

.AVIATION...
EXPECT VFR TO IFR CONDITIONS OVERNIGHT AT ALL TERMINALS. SOME
PATCHY FOG IS POSSIBLE. CIGS WILL BE UNSTABLE AND COULD BOUNCE
BETWEEN IFR TO MVFR CONDITIONS AFTER SUNSET.

&&

.MARINE...
ONSHORE WINDS ARE EXPECTED TO CONTINUE ACROSS THE NORTHERN GULF
WATERS BUT THEY HAVE RELAXED SOME AND THAT HAS ALLOWED THE SMALL
CRAFT ADVISORY TO EXPIRE AND TO BE REPLACED WITH EXERCISE CAUTION
FOR THE ENTIRE COASTAL WATERS. THE LOW WILL KICK TO THE NORTHEAST
AND THE PRESSURE GRADIENT MAY INCREASE SOME BUT THAT WILL HAVE TO
BE WATCHED FOR A POSSIBLE UPGRADE. HIGH PRESSURE MOVES IN FOR THE
FIRST HALF OF THE WEEK AS CONDITIONS CALM DOWN SIGNIFICANTLY
SUNDAY THROUGH WEDNESDAY.

&&

.DECISION SUPPORT...
DSS CODE....ORANGE.
DEPLOYED...NONE.
ACTIVATION...NONE.
ACTIVITIES...COASTAL FLOODING
             FLASH FLOODING
             MAJOR RIVER FLOODING

DECISION SUPPORT SERVICES (DSS) CODE LEGEND
GREEN  = NO WEATHER IMPACTS THAT REQUIRE ACTION
BLUE   = LONG FUSED WATCH/WARNING/ADVISORY IN EFFECT OR HIGH
         VISIBILITY EVENT
YELLOW = HEIGHTENED IMPACTS WITH SHORT FUSED WATCH/WARNING/ADVISORY
         ISSUANCES; RADAR SUPPORT
ORANGE = HIGH IMPACTS - SLIGHT TO MODERATE RISK SEVERE; NEARBY
         TROPICAL EVENTS; HAZMAT OR OTHER LARGE EPISODES
RED    = FULL ENGAGEMENT FOR MODERATE RISK SVR AND/OR DIRECT
         TROPICAL THREATS; EVENTS OF NATIONAL SIGNIFICANCE

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  63  74  58  77 /  90  90  30  10
BTR  63  75  60  79 /  60  70  20  10
ASD  64  74  61  78 /  90  90  30  10
MSY  65  74  63  78 /  60  80  20  10
GPT  64  72  62  75 /  90  90  40  10
PQL  62  71  62  76 /  90  90  40  10

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH THROUGH SATURDAY AFTERNOON FOR LAZ034>037-039-
     040-046>050-056>072.

     COASTAL FLOOD ADVISORY UNTIL 6 PM CST SATURDAY FOR LAZ057-
     060>064-066>070.

     COASTAL FLOOD WARNING UNTIL 6 PM CST SATURDAY FOR LAZ040-049-050-
     058-072.

GM...NONE.
MS...FLASH FLOOD WATCH THROUGH SATURDAY AFTERNOON FOR MSZ068>071-077-
     080>082.

     COASTAL FLOOD ADVISORY UNTIL 6 PM CST SATURDAY FOR MSZ081-082.

     COASTAL FLOOD WARNING UNTIL 6 PM CST SATURDAY FOR MSZ080.

GM...NONE.
&&

Hazardous weather outlook, Mar 11, 5:00 PM CST, 3 hours 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
500 PM CST FRI MAR 11 2016

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-121400-
LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND-
LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND-
COASTAL WATERS FROM PORT FOURCHON LA TO LOWER ATCHAFALAYA RIVER
LA OUT 20 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO PORT FOURCHON LOUISIANA OUT 20 NM-
COASTAL WATERS FROM BOOTHVILLE LA TO SOUTHWEST PASS OF THE
MISSISSIPPI RIVER OUT 20 NM-
COASTAL WATERS FROM PASCAGOULA MISSISSIPPI TO STAKE ISLAND OUT
20 NM-
COASTAL WATERS FROM PORT FOURCHON LOUISIANA TO LOWER ATCHAFALAYA
RIVER LA FROM 20 TO 60 NM-
COASTAL WATERS FROM SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO
PORT FOURCHON LOUISIANA FROM 20 TO 60 NM-
COASTAL WATERS FROM STAKE ISLAND LA TO SOUTHWEST PASS OF THE
MISSISSIPPI RIVER FROM 20 TO 60 NM-
COASTAL WATERS FROM PASCAGOULA MISSISSIPPI TO STAKE ISLAND
LOUISIANA OUT 20 TO 60 NM-POINTE COUPEE-WEST FELICIANA-
EAST FELICIANA-ST. HELENA-WASHINGTON-ST. TAMMANY-IBERVILLE-
WEST BATON ROUGE-EAST BATON ROUGE-ASCENSION-LIVINGSTON-ASSUMPTION-
ST. JAMES-ST. JOHN THE BAPTIST-UPPER LAFOURCHE-ST. CHARLES-
UPPER JEFFERSON-ORLEANS-UPPER PLAQUEMINES-UPPER ST. BERNARD-
UPPER TERREBONNE-LOWER TERREBONNE-LOWER LAFOURCHE-LOWER JEFFERSON-
LOWER PLAQUEMINES-LOWER ST. BERNARD-NORTHERN TANGIPAHOA-
SOUTHERN TANGIPAHOA-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER-
HANCOCK-HARRISON-JACKSON-
500 PM CST FRI MAR 11 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
LOUISIANA...SOUTH MISSISSIPPI AND THE ADJACENT COASTAL WATERS.

.DAY ONE...TONIGHT

A FLASH FLOOD WATCH REMAINS IN EFFECT. ADDITIONAL LIGHT TO MODERATE
RAIN IS POSSIBLE TONIGHT. ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4
INCHES ARE POSSIBLE THROUGH SATURDAY AFTERNOON.

COASTAL FLOOD WARNINGS AND ADVISORIES REMAIN IN EFFECT THROUGH
SATURDAY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A FLASH FLOOD WATCH WILL REMAIN IN EFFECT FOR THE ENTIRE AREA
THROUGH SATURDAY AFTERNOON. ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4
INCHES ARE POSSIBLE THROUGH SATURDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THROUGH SATURDAY...MAINLY FOR
FLOOD REPORTING.

In the hours before

Local storm report, Mar 11, 3:36 PM CST, 4 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
336 PM CST FRI MAR 11 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0315 PM     FLOOD            5 NW COVINGTON          30.53N 90.17W
03/11/2016                   ST. TAMMANY        LA   EMERGENCY MNGR

            LOUISIANA HIGHWAY 25 REPORTED FLOODED BETWEEN LAKE RAMSEY
            ROAD AND MILLION DOLLAR ROAD.

&&

CBANNAN

Local storm report, Mar 11, 3:53 PM CST, 4 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
353 PM CST FRI MAR 11 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0340 PM     FLOOD            COVINGTON               30.48N 90.11W
03/11/2016                   ST. TAMMANY        LA   LAW ENFORCEMENT

            HWY 437 NORTH OF RIVER ROAD CLOSED DUE TO RIVER FLOODING
            ON THE BOGUE FALAYA.

&&

CBANNAN

Local storm report, Mar 11, 5:06 PM CST, 2 hours 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
506 PM CST FRI MAR 11 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 AM     FLASH FLOOD      4 N COVINGTON           30.54N 90.11W
03/11/2016                   ST. TAMMANY        LA   FIRE DEPT/RESCUE

            SHERIFFS OFFICE AND WILDLIFE AND FISHERIES CONDUCTED THE
            RESCUE OPERATIONS OF 86 KIDS AND A NUMBER COUSELORS FROM
            THE CAMP ABBEY RETREAT CENTER.

&&

CBANNAN

Local storm report, Mar 11, 5:21 PM CST, 2 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
521 PM CST FRI MAR 11 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1000 AM     HEAVY RAIN       LIVINGSTON              30.50N 90.75W
03/11/2016  M10.25 INCH      LIVINGSTON         LA   CO-OP OBSERVER

            10.25 INCHES OF RAIN MEASURED BY THE LIVINGSTON CO-OP
            OBSERVER

&&

CBANNAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 11, 7:21 PM CST	Areal Flood Warning	LIX	Livingston	6 hr
Mar 11, 9:42 PM CST	Small Craft Advisory	LIX		20 hr
Mar 12, 12:00 AM CST	Flash Flood Warning Emergency	LIX	Saint Tammany	8 hr
Mar 12, 4:14 AM CST	Areal Flood Warning	LIX	Saint John the Baptist, Saint Tammany, Tangipahoa, Washington	6 hr
Mar 12, 6:14 AM CST	Special Marine Warning	LIX		91 min
Mar 12, 8:01 AM CST	Flash Flood Warning	LIX	Saint Tammany	8 hr
Mar 12, 9:00 AM CST	Flash Flood Warning	LIX	Ascension, Livingston, Saint Tammany, Tangipahoa	7 hr
Mar 12, 1:17 PM CST	River Flood Warning	LIX	East Baton Rouge, West Baton Rouge	22 days
Mar 12, 3:52 PM CST	Flash Flood Warning	LIX	Livingston, Saint Tammany, Tangipahoa	8 hr

Nearby

Flash Flood Warnings in Louisiana, 2016 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.