Alert archive / Louisiana / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 42, NWS New Orleans, LA

March 11, 20166 parishes in Louisiana; Hancock County, Pearl River County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 11, 2016, 5:21 AM CST for 6 parishes in Louisiana; Hancock County, Pearl River County, Mississippi. It was in force for 39 min. 1 report 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, 5:21 AM CST (11:21 UTC)
Expired: Mar 11, 2016, 6:00 AM CST
In force: 39 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Hancock County, MS, Pearl River County, MS

What was reported inside it

Time	Report	Where	Remark
Mar 11, 5:22 AM CST	MARINE TSTM WIND 46	Lakefront Airport, LA

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 severe thunderstorm 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, 11.4 hours before the alert went out and 12 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: 687 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 512 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 463 m²/s²
0-3 km storm-relative helicity: 470 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 14.9

Open this sounding in Storm Lab

The text

As transmitted.

203 
WUUS54 KLIX 111121
SVRLIX
LAC071-075-087-103-105-117-MSC045-109-111200-
/O.NEW.KLIX.SV.W.0042.160311T1121Z-160311T1200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
521 AM CST FRI MAR 11 2016

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ORLEANS PARISH IN SOUTHEASTERN LOUISIANA...
  SOUTHEASTERN WASHINGTON PARISH IN SOUTHEASTERN LOUISIANA...
  ST. BERNARD PARISH IN SOUTHEASTERN LOUISIANA...
  ST. TAMMANY PARISH IN SOUTHEASTERN LOUISIANA...
  SOUTHERN TANGIPAHOA PARISH IN SOUTHEASTERN LOUISIANA...
  NORTHWESTERN PLAQUEMINES PARISH IN SOUTHEASTERN LOUISIANA...
  SOUTHWESTERN PEARL RIVER COUNTY IN SOUTHERN MISSISSIPPI...
  WESTERN HANCOCK COUNTY IN SOUTHERN MISSISSIPPI...

* UNTIL 600 AM CST

* AT 520 AM CST...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR PONCHATOULA TO NEAR MADISONVILLE TO 10 MILES
  SOUTHWEST OF LACOMBE TO NEAR MYRTLE GROVE...MOVING NORTHEAST AT 45
  MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  NEW ORLEANS...SLIDELL...HAMMOND...BOGALUSA...PICAYUNE...
  COVINGTON...CHALMETTE...EAST NEW ORLEANS...TIMBERLANE...BELLE
  CHASSE...PORT SULPHUR...GRETNA...PONCHATOULA...PEARL RIVER...ABITA
  SPRINGS...MADISONVILLE...FOLSOM...SUN...CROSSROADS AND ROBERT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
NEW ORLEANS.

&&

LAT...LON 3065 8953 3023 8942 3022 8982 3016 8986
      3013 8986 3015 8963 2995 8984 2994 8976
      2996 8973 2991 8974 2988 8960 3008 8948
      2987 8933 2946 8993 3003 9007 3023 8983
      3045 9051 3097 8999
TIME...MOT...LOC 1120Z 226DEG 39KT 3045 9040 3034 9023 3021 9007 2957
8991

HAIL...<.75IN
WIND...60MPH
 
$$

32

1 follow-up statement

510 
WWUS54 KLIX 111142
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
542 AM CST FRI MAR 11 2016

LAC075-105-111152-
/O.CAN.KLIX.SV.W.0042.000000T0000Z-160311T1200Z/
TANGIPAHOA LA-PLAQUEMINES LA-
542 AM CST FRI MAR 11 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TANGIPAHOA AND
NORTHWESTERN PLAQUEMINES PARISHES IS CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE WARNED
AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3065 8953 3023 8942 3022 8982 3016 8987
      3010 8982 3015 8963 3000 8986 2987 8970
      2988 8959 3008 8948 2987 8933 2968 8962
      2993 9005 3003 9007 3023 8983 3039 9020
      3036 9024 3071 9026 3097 8999
TIME...MOT...LOC 1142Z 226DEG 39KT 3061 9021 3050 9004 3037 8988 2973
8972

$$

LAC071-087-103-117-MSC045-109-111200-
/O.CON.KLIX.SV.W.0042.000000T0000Z-160311T1200Z/
ORLEANS LA-WASHINGTON LA-ST. BERNARD LA-ST. TAMMANY LA-
PEARL RIVER MS-HANCOCK MS-
542 AM CST FRI MAR 11 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 AM CST
FOR ORLEANS...SOUTHEASTERN WASHINGTON...ST. BERNARD AND ST. TAMMANY
PARISHES...SOUTHWESTERN PEARL RIVER AND WESTERN HANCOCK COUNTIES...

AT 542 AM CST...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM FOLSOM TO ABITA SPRINGS TO NEAR LACOMBE TO 11 MILES
NORTH OF POINTE A LA HACHE...MOVING NORTHEAST AT 45 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

LOCATIONS IMPACTED INCLUDE...
NEW ORLEANS...SLIDELL...BOGALUSA...PICAYUNE...COVINGTON...
CHALMETTE...EAST NEW ORLEANS...BELLE CHASSE...GRETNA...PEARL RIVER...
ABITA SPRINGS...MADISONVILLE...FOLSOM...SUN...CROSSROADS...BUSH...
ENON...MERAUX...STENNIS SPACE CENTER AND ARABI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
NEW ORLEANS.

&&

LAT...LON 3065 8953 3023 8942 3022 8982 3016 8987
      3010 8982 3015 8963 3000 8986 2987 8970
      2988 8959 3008 8948 2987 8933 2968 8962
      2993 9005 3003 9007 3023 8983 3039 9020
      3036 9024 3071 9026 3097 8999
TIME...MOT...LOC 1142Z 226DEG 39KT 3061 9021 3050 9004 3037 8988 2973
8972

HAIL...<.75IN
WIND...60MPH
 
$$

32

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Mar 11, 4:13 AM CST, 1 hour 8 minutes earlier.

Area forecast discussion, Mar 11, 4:13 AM CST, 1 hour 8 minutes before

AREA FORECAST DISSCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
413 AM CST FRI MAR 11 2016

...LONG DURATION VERY HEAVY RAIN EVENT IN PROGRESS...

.SYNOPSIS...

00Z LIX PRECIPITABLE WATER VALUE WAS 1.99 INCHES...WHICH IS PRETTY
MUCH THE TOP OF THE CHART FOR MARCH. UPPER LOW CURRENTLY NEAR
BROWNSVILLE TEXAS AND HAS NOT TAKEN ON A NEGATIVE TILT YET.
NUMEROUS SURGES OF MOISTURE EVIDENT ON WATER VAPOR POINTED AT THE
LOUISIANA COAST. ONE SURGE HAS A NEARLY SOLID LINE OF CONVECTION
FROM ALEXANDRIA TO LAFAYETTE THEN WELL OUT INTO THE GULF. THIS
BAND WILL MOVE INTO THE ATCHAFALAYA BASIN IN THE NEXT COUPLE
HOURS. MESOLOW ASSOCIATED WITH THIS BAND OF CONVECTION CURRENTLY
SOUTHWEST OF MORGAN CITY. OVER THE LOCAL AREA...PORTIONS OF THE
AREA NEAR HAMMOND HAVE LIKELY SEEN 8 TO 12 INCHES OF RAIN
ALREADY...WITH A LOT MORE TO COME.

&&

.SHORT TERM...

SHORT VERSION IS THAT FLASH FLOOD WATCH WILL REMAIN IN EFFECT.
ENTIRE AREA REMAINS IN MODERATE RISK OF FLASH FLOODING WITH AREAS
NEAR HAMMOND IN HIGH RISK. MODELS IN GOOD AGREEMENT THAT UPPER
SYSTEM WILL TAKE ON A NEGATIVE TILT THIS AFTERNOON OR
TONIGHT...INCREASING UPPER DIVERGENCE. FOCUS OF CONVECTION SHOULD
GRADUALLY SHIFT EASTWARD DURING THE DAY AND MOVE INTO AREAS THAT
HAVE NOT GOTTEN INTO THE HEAVY RAIN YET...SUCH AS THE NEW ORLEANS
METRO AREA AND MISSISSIPPI COAST. WIDESPREAD 4 TO 8 INCH RAINFALL
AMOUNTS POSSIBLE OVER THE NEXT 36 HOURS ON TOP OF WHAT HAS ALREADY
FALLEN. CERTAINLY...PORTIONS OF THE AREA WHERE ECHO TRAINING
OCCURS WILL SEE EVEN MORE THAN THAT. NO DOUBT THAT AREAS WILL BE
WELL IN EXCESS OF ONE FOOT OF RAIN BEFORE THE EVENT ENDS.

UPPER LOW FINALLY SHIFTS TO THE NORTH OF THE AREA SATURDAY
NIGHT...ENDING THE RAIN AS DRYING MOVES IN. 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. THIS SHOULD ALLOW SUNDAY AND SUNDAY NIGHT
TO REMAIN DRY ACROSS MOST OF THE AREA.

WHILE TEMPERATURES TODAY AND SATURDAY WILL BE HELD TO THE 70 TO 75
RANGE...SUNSHINE ON SUNDAY WILL ALLOW TEMPERATURE TO RISE TO NEAR
THE 80 DEGREE MARK. 35

&&

.LONG TERM...

MEDIUM RANGE MODELS IN DECENT AGREEMENT ON 500 MB PATTERN MONDAY
AND TUESDAY MORNING BEFORE DIVERGING SIGNIFICANTLY ON STRENGTH OF
SYSTEM MOVING THROUGH THE MIDDLE MISSISSIPPI RIVER VALLEY WITH GFS
BECOMING MUCH DEEPER THAN ECMWF. THIS WILL ALSO PRODUCE
SIGNIFICANT DIFFERENCES IN SURFACE PRESSURE...GFS ABOUT 15 MB
DEEPER BY TUESDAY EVENING OVER ILLINOIS. BOTH PUSH A FRONT INTO
THE AREA TUESDAY NIGHT. THE WEAKER ECMWF ALLOWS THE FRONT TO HANG
UP OVER THE LOCAL AREA LATE IN THE WEEK...WHILE THE GFS PUSHES IT
INTO THE GULF. WILL TREND SOMEWHAT NEARER THE ECMWF WITH HIGHER
CHANCE POPS FOR THURSDAY AND FRIDAY. THIS ALSO NECESSITATES THAT
TEMPERATURE FORECAST GO SOMEWHAT WARMER THAN GFS SOLUTION FOR
THURSDAY/FRIDAY. 35

&&

.AVIATION...

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO INCREASE IN COVERAGE
ACROSS ALL SITES. FLIGHT RESTRICTIONS WILL REMAIN MOSTLY IN THE IFR
RANGE...ESPECIALLY DURING PERIODS OF HEAVY RAIN. 7/ARM

&&

.MARINE...

STRONG ONSHORE WINDS ARE EXPECTED TO CONTINUE ACROSS THE NORTHERN
GULF WATERS AS THE PREVIOUSLY ADVERTISED LOW PRESSURE SYSTEM
APPROACHES FROM THE WEST. EXPECT FOR WINDS AND SEAS TO CONTINUE TO
MEET SMALL CRAFT ADVISORY CRITERIA ACROSS ALL COASTAL WATERS THROUGH
THIS EVENING...WITH CONDITIONS SLOWLY IMPROVING FROM THE WEST.
HOWEVER...ADVISORY CRITERIA CONDITIONS ARE STILL EXPECTED TO
CONTINUE ACROSS THE OPEN WATERS EAST OF THE MISSISSIPPI RIVER AT
LEAST THROUGH SATURDAY MORNING. 7/ARM

&&

.HYDROLOGY AND COASTAL FLOODING...

COMBINATION OF CURRENT AND POSSIBLE ADDITIONAL FLASH
FLOODING...RISING RIVERS...AND CURRENT TIDE LEVELS STILL RUNNING 2
TO 3 FEET ABOVE NORMAL WILL LEAD TO ADDITIONAL INUNDATION OF LOWER
LYING ROADS FOR AREAS SURROUNDING LAKE MAUREPAS...WESTERN AND
NORTHERN LAKE PONTCHARTRAIN...AND HANCOCK COUNTY...SO HAVE
UPGRADED THE COASTAL FLOOD ADVISORY TO A WARNING AND EXTENDED THE
EXPIRATION TIME TO 6 PM SATURDAY SINCE MODERATE TO OCCASIONALLY
STRONG SOUTHEAST WINDS ARE FORECAST TO CONTINUE TO PUSH WATER
IN...AND TIDAL RANGES ALSO INCREASE ON SATURDAY. REMAINING COASTAL
AREAS SHOULD GENERALLY SEE TIDES REMAINING 1.5 TO 2 FEET ABOVE
NORMAL...SO WILL NOT UPGRADE THE ADVISORY AT THIS TIME.

MOST RIVERS /WITH THE EXCEPTION OF MOST OF THE MISSISSIPPI RIVER/ IN
OUR SERVICE AREA ARE FORECAST TO REACH MINOR TO MODERATE FLOOD STAGE
IN THE NEXT FEW DAYS...AND SOME RIVER BASINS THAT SEE HIGHER THAN
EXPECTED ADDITIONAL RAINFALL COULD SEE FORECAST CRESTS ADJUSTED EVEN
HIGHER. EXPECT FREQUENT UPDATED RIVER FLOOD WARNINGS AND STATEMENTS.
22/TD

&&

.DECISION SUPPORT...

DSS CODE....ORANGE.
DEPLOYED...NONE.
ACTIVATION...NONE.
ACTIVITIES...COASTAL FLOODING...FLASH FLOODING...RIVER FLOODING
             SMALL CRAFT ADVISORY

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  72  65  72  58 / 100  80  90  30
BTR  73  65  75  60 / 100  80  80  20
ASD  72  66  73  61 / 100  90  90  40
MSY  73  66  74  62 / 100  90  90  20
GPT  71  66  72  62 / 100  90  90  60
PQL  72  65  72  61 / 100  90  90  60

&&

.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 6 PM CST THIS EVENING FOR GMZ530-532-
     534-550-552-570-572.

     SMALL CRAFT ADVISORY UNTIL 6 AM CST SATURDAY FOR GMZ536-538-555-
     557-575-577.

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 6 PM CST THIS EVENING FOR GMZ532-534-
     550-552-570-572.

     SMALL CRAFT ADVISORY UNTIL 6 AM CST SATURDAY FOR GMZ538-555-557-
     575-577.

&&

Hazardous weather outlook, Mar 11, 5:15 AM CST, 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
515 AM 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>082-112315-
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-
515 AM CST FRI MAR 11 2016

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

.DAY ONE...TODAY AND TONIGHT.

SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR ALL THE COASTAL
WATERS THROUGH THIS EVENING. ADVISORY CONDITIONS WILL CONTINUE
ACROSS THE OPEN WATERS EAST OF THE MISSISSIPPI RIVER THROUGH THE
OVERNIGHT HOURS.

COASTAL FLOOD WARNINGS AND ADVISORIES ARE IN EFFECT THROUGH
SATURDAY.

STRONG THUNDERSTORMS ARE POSSIBLE THIS MORNING...SOME COULD BECOME
SEVERE. THE MAIN CONCERNS WILL BE DAMAGING WINDS AND THE POSSIBILITY
OF AN ISOLATED TORNADO.

A FLASH FLOOD WATCH REMAINS IN EFFECT. HEAVY RAINFALL IS EXPECTED
TO IMPACT SOME AREAS OVERNIGHT WITH A FEW INCHES OF RAINFALL
POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

A FLASH FLOOD WATCH WILL REMAIN IN EFFECT FOR THE ENTIRE AREA
THROUGH SATURDAY AFTERNOON. STORM TOTAL RAINFALL AMOUNTS OF 7 TO
10 INCHES ARE EXPECTED WITH LOCALLY HIGHER AMOUNTS POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Mar 11, 3:25 AM CST, 1 hour 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
325 AM CST FRI MAR 11 2016

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

0315 AM     MARINE TSTM WIND 76 S TIMBALIER BAY BUOY 28.08N 90.82W
03/11/2016  M64 MPH          GMZ570             XX   AWOS

            SHIP SHOAL 354 AWOS KSQE REPORTED PEAK WIND GUST OF 56
            KNOTS WITH A THUNDERSTORM.

&&

BWAGNER

Special weather statement, Mar 11, 3:33 AM CST, 1 hour 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
333 AM CST FRI MAR 11 2016

LAZ046-049-056>061-065>068-111030-
UPPER LAFOURCHE LA-UPPER JEFFERSON LA-IBERVILLE LA-
LOWER JEFFERSON LA-ST. CHARLES LA-LOWER LAFOURCHE LA-ASSUMPTION LA-
ST. JOHN THE BAPTIST LA-UPPER TERREBONNE LA-ASCENSION LA-
ST. JAMES LA-LOWER TERREBONNE LA-
333 AM CST FRI MAR 11 2016

...SIGNIFICANT WEATHER ADVISORY FOR LAFOURCHE...SOUTHERN ST.
CHARLES...ASSUMPTION...ST. JAMES...SOUTHWESTERN ST. JOHN THE
BAPTIST...TERREBONNE...SOUTHEASTERN IBERVILLE...SOUTHWESTERN
ASCENSION AND WEST CENTRAL JEFFERSON PARISHES UNTIL 430 AM CST...

AT 332 AM CST...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR FRANKLIN TO NEAR DULAC
TO 49 MILES SOUTH OF COCODRIE...AND MOVING NORTHEAST AT 35 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
HOUMA...THIBODAUX...GONZALES...DONALDSONVILLE...NAPOLEONVILLE...CUT
OFF...GALLIANO...LAROSE...ST. GABRIEL...GRAMERCY...LUTCHER...
LOCKPORT...GOLDEN MEADOW...WHITE CASTLE...SORRENTO...BAYOU GENEVE...
SOUTH VACHERIE...MATHEWS...COCODRIE AND SUPREME.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 2929 9037 2929 9038 2922 9041 2935 9043
      2911 9071 2926 9075 2955 9123 2962 9108
      2975 9109 3006 9129 3028 9107 2974 9016
      2927 9004 2931 9006 2926 9004 2932 9007
      2910 9018
TIME...MOT...LOC 0932Z 227DEG 30KT 2976 9149 2930 9071 2855 9051

32

Local storm report, Mar 11, 3:39 AM CST, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
339 AM CST FRI MAR 11 2016

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

0315 AM     FLASH FLOOD      FRANKLINTON             30.85N 90.14W
03/11/2016                   WASHINGTON         LA   LAW ENFORCEMENT

            BROADCAST MEDIA RELAYED REPORT FROM FRANKLINTON POLICE
            DEPARTMENT OF MODERATE STREET FLOODING. ALSO REPORT THAT
            THE FAIRGROUNDS ARE FLOODED WITH THE POTENTIAL TO WASH
            OUT A BRIDGE. ONE CAR COMPLETELY SUBMERGED.

&&

BWAGNER

Local storm report, Mar 11, 4:08 AM CST, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
408 AM CST FRI MAR 11 2016

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

0330 AM     HEAVY RAIN       LIVINGSTON              30.50N 90.75W
03/11/2016  M7.57 INCH       LIVINGSTON         LA   CO-OP OBSERVER

            CO-OP OBSERVER IN LIVINGSTON REPORTS STORM TOTAL OF 7.57
            INCHES AND STILL RAINING.

&&

BWAGNER

Local storm report, Mar 11, 4:28 AM CST, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
428 AM CST FRI MAR 11 2016

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

0411 AM     TSTM WND DMG     10 WSW BAYOU CANE       29.57N 90.91W
03/11/2016                   TERREBONNE         LA   911 CALL CENTER

            TREE BLOWN OVER AT 3839 BAYOU BLACK DRIVE. TIME ESTIMATED
            FROM RADAR.

0411 AM     TSTM WND DMG     9 WNW HOUMA             29.61N 90.85W
03/11/2016                   TERREBONNE         LA   EMERGENCY MNGR

            TREE BLOWN OVER AT 4449 BAYOU BLACK DRIVE. TIME ESTIMATED
            FROM RADAR.

&&

ANSORGE

Special weather statement, Mar 11, 5:15 AM CST, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
515 AM CST FRI MAR 11 2016

LAZ069-111200-
LOWER PLAQUEMINES LA-
515 AM CST FRI MAR 11 2016

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PLAQUEMINES PARISH UNTIL
600 AM CST...

AT 511 AM CST...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES SOUTHWEST OF PORT
SULPHUR TO 31 MILES SOUTH OF VENICE...AND MOVING NORTH AT 65 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
PORT SULPHUR...POINTE A LA HACHE...BURAS-TRIUMPH...BURAS...
BOOTHVILLE...VENICE...EMPIRE...BOOTHVILLE-VENICE AND BOOTHVILLE ASOS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2894 8941 2925 8946 2939 8978 2978 8987
      2978 8986 2967 8957 2969 8967 2963 8964
      2961 8974 2941 8954 2940 8958 2922 8902
      2909 8907 2915 8914 2902 8917 2904 8932
      2921 8933 2903 8932 2900 8935 2908 8937
TIME...MOT...LOC 1111Z 169DEG 56KT 2941 8975 2883 8929

32

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 10, 7:12 PM CST	River Flood Warning	LIX	Ascension, Livingston	6 days
Mar 10, 7:12 PM CST	River Flood Warning	LIX	Tangipahoa	50 hr
Mar 10, 7:12 PM CST	River Flood Warning	LIX	Tangipahoa	68 hr
Mar 10, 7:56 PM CST	Flash Flood Warning	LIX	Ascension, Assumption, Livingston, Saint Helena, Saint James, Saint Tammany and 2 more	2 hr
Mar 10, 9:28 PM CST	Flash Flood Warning	LIX	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 5 more	4 hr
Mar 11, 1:24 AM CST	Flash Flood Warning	LIX	Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington	3 hr
Mar 11, 1:50 AM CST	Flash Flood Warning Emergency	LIX	Tangipahoa	2 hr
Mar 11, 2:13 AM CST	River Flood Warning	LIX	Washington	4 days
Mar 11, 2:21 AM CST	Special Marine Warning	LIX		114 min
Mar 11, 3:13 AM CST	Special Marine Warning	LIX		62 min
Mar 11, 3:33 AM CST	Special Weather Statement	LIX	Assumption, Lafourche, Saint James, Terrebonne	57 min
Mar 11, 4:06 AM CST	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint James, Saint John the Baptist, Terrebonne	24 min
Mar 11, 4:12 AM CST	Flash Flood Warning	LIX	Saint Tammany, Washington	4 hr
Mar 11, 4:16 AM CST	Flash Flood Warning Emergency	LIX	Livingston, Tangipahoa	3 hr
Mar 11, 4:28 AM CST	Severe Thunderstorm Warning	LIX	Ascension, Jefferson, Lafourche, Livingston, Orleans, Plaquemines and 5 more	32 min
Mar 11, 4:31 AM CST	Special Marine Warning	LIX		59 min
Mar 11, 4:48 AM CST	Special Marine Warning	LIX		42 min
Mar 11, 4:57 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Livingston, Orleans, Plaquemines, Saint Bernard, Saint Charles and 3 more	33 min
Mar 11, 5:04 AM CST	Coastal Flood Warning	LIX	Saint John the Baptist	49 hr
Mar 11, 5:08 AM CST	Special Marine Warning	LIX		67 min
Mar 11, 5:15 AM CST	Special Weather Statement	LIX	Plaquemines	45 min
Mar 11, 5:18 AM CST	Special Marine Warning	LIX		42 min
Mar 11, 5:50 AM CST	River Flood Warning	LIX	Tangipahoa	50 hr
Mar 11, 6:04 AM CST	Special Marine Warning	LIX		56 min
Mar 11, 6:30 AM CST	River Flood Warning	LIX	Ascension, Livingston	7 days
Mar 11, 7:22 AM CST	Flash Flood Warning Emergency	LIX	Saint Tammany, Tangipahoa, Washington	13 hr
Mar 11, 7:37 AM CST	Areal Flood Warning	LIX	Ascension, East Baton Rouge, Livingston	9 hr
Mar 11, 7:58 AM CST	Areal Flood Warning	LIX	Saint Tammany	3 hr
Mar 11, 8:53 AM CST	Areal Flood Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena	3 hr
Mar 11, 12:01 PM CST	Flash Flood Warning	LIX	Saint Tammany	8 hr
Mar 11, 12:08 PM CST	Flash Flood Warning Emergency	LIX	Saint Tammany	8 hr
Mar 11, 4:29 PM CST	Areal Flood Warning	LIX	Livingston	3 hr
Mar 10, 9:02 PM CST	Areal Flood Advisory	LIX	Amite, Pike, Walthall	118 min
Mar 11, 2:17 AM CST	River Flood Warning	LIX	Jackson	15 days
Mar 11, 2:19 AM CST	River Flood Warning	LIX	Jackson	5 days
Mar 11, 5:58 AM CST	Special Weather Statement	LIX	Hancock, Pearl River	62 min
Mar 11, 6:54 AM CST	Special Weather Statement	LIX	Harrison	36 min
Mar 11, 7:30 AM CST	Areal Flood Advisory	LIX	Hancock, Harrison, Jackson	3 hr
Mar 11, 7:44 AM CST	Flash Flood Warning	LIX	Walthall	8 hr
Mar 11, 7:59 AM CST	Flash Flood Warning	LIX	Pike	8 hr
Mar 11, 8:40 AM CST	Flash Flood Warning	LIX	Harrison, Jackson	3 hr
Mar 11, 9:09 AM CST	River Flood Warning	LIX	Harrison	71 hr
Mar 11, 9:15 AM CST	River Flood Warning	LIX	Harrison	57 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2016 Severe Thunderstorm Warnings in Mississippi, 2016 Every severe thunderstorm 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.