Alert archive / Louisiana / Flash Flood Warnings in 2016

Flash Flood Warning 15, NWS New Orleans, LA

March 12, 2016Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 12, 2016, 12:00 AM CST for Saint Tammany Parish, Louisiana. It was in force for 8 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: Mar 12, 2016, 12:00 AM CST (06:00 UTC)
Expired: Mar 12, 2016, 8:00 AM CST
In force: 8 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Emergency: Flash flood emergency
Flood severity: None

County Saint Tammany Parish, LA

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, 6.0 hours before the alert went out and 43 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.

321 
WGUS54 KLIX 120600
FFWLIX
LAC103-121400-
/O.NEW.KLIX.FF.W.0015.160312T0600Z-160312T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1200 AM CST SAT MAR 12 2016

...FLASH FLOOD EMERGENCY FOR COVINGTON AND SURROUNDING AREAS IN ST
TAMMANY PARISH...

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL ST. TAMMANY PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 800 AM CST SATURDAY

* AT 1156 PM CST...THE BOGUE FALAYA RIVER CONTINUED TO RISE AND IS
  NOW EXPECTED TO CREST NEAR 21.5 FEET EARLY SATURDAY MORNING.

  THIS IS A FLASH FLOOD EMERGENCY FOR COVINGTON AND SURROUNDING
  AREAS OF ST TAMMANY PARISH. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  COVINGTON...ABITA SPRINGS AND MADISONVILLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A FLASH FLOOD EMERGENCY. WITH THIS NEW CREST
INFORMATION...ADDITIONAL LIFE THREATENING FLOODING COULD OCCUR. MOVE
TO HIGHER GROUND NOW IF YOU LIVE IN ONE OF THE FLOOD THREATENED
AREAS. 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...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3050 8999 3042 9004 3039 9017 3053 9015
      3053 9006

$$

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, 11:49 PM CST, 11 minutes earlier.

Area forecast discussion, Mar 11, 11:49 PM CST, 11 minutes before

AREA FORECAST DISSCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1149 PM CST FRI MAR 11 2016

.AVIATION...
VARIABLE CONDITIONS ACROSS THE TAF SITES LATE THIS EVENING WILL
GRADUALLY SETTLE INTO THE MVFR TO IFR CATEGORIES OVERNIGHT AND
INTO EARLY SATURDAY MORNING. THESE CONDITIONS WILL GENERALLY PERSIST
THROUGH MUCH OF SATURDAY. CONVECTION OVER THE CENTRAL AND NORTHERN
GULF IS LIKLEY TO SHIFT NORTHWARD INTO THE SECTIONS OF THE
FORECAST AREA LATE TONIGHT AND SATURDAY MORNING. THE THREAT OF
SHOWERS AND A FEW THUNDERSTORMS WILL CONTINUE THROUGH MUCH OF THE
DAY SATURDAY...ALTHOUGH THE THREAT WILL GRADUALLY SHIFT EASTWARD
DURING THE COURSE OF THE AFTERNOON. 11

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  63  74  58  77 /  60  90  30  10
BTR  63  75  60  79 /  50  70  20  10
ASD  64  74  61  78 /  70  90  30  10
MSY  65  74  63  78 /  70  80  20  10
GPT  64  72  62  75 /  80  90  40  10
PQL  62  71  62  76 /  80  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...SMALL CRAFT ADVISORY UNTIL NOON CST SATURDAY FOR GMZ536-538-555-
     557-572-575-577.

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...SMALL CRAFT ADVISORY UNTIL NOON CST SATURDAY FOR GMZ538-555-557-
     572-575-577.

&&

Hazardous weather outlook, Mar 11, 5:00 PM CST, 7 hours 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, 8:11 PM CST, 3 hours 49 minutes before

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

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

0811 PM     FLOOD            ABITA SPRINGS           30.48N 90.03W
03/11/2016                   ST. TAMMANY        LA   EMERGENCY MNGR

            HWY 435 BY HILLCREST HAS BEEN CLOSED DUE TO HIGH WATER.

&&

CBANNAN

Local storm report, Mar 11, 8:14 PM CST, 3 hours 46 minutes before

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

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

0811 PM     FLOOD            FOLSOM                  30.63N 90.20W
03/11/2016                   ST. TAMMANY        LA   FIRE DEPT/RESCUE

            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.

&&

CBANNAN

Local storm report, Mar 11, 8:50 PM CST, 3 hours 10 minutes before

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

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

0815 PM     FLOOD            3 NNE COVINGTON         30.52N 90.09W
03/11/2016                   ST. TAMMANY        LA   NWS EMPLOYEE

            WATER BEGINNING TO ENTER HOMES IN MAGNOLIA GARDENS IN
            COVINGTON. RELATED TO BOGUE FALAYA RIVER.

&&

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, 8:04 PM CST	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa, Washington	8 hr
Mar 11, 9:42 PM CST	Small Craft Advisory	LIX		20 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; the sounding from the Mesonet's radiosonde archive.