Alert archive / Louisiana / Special Weather Statements in 2016

Special Weather Statement, NWS New Orleans, LA

July 21, 2016Orleans Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jul 21, 2016, 12:01 PM CDT for Orleans Parish, Louisiana. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 21, 2016, 12:01 PM CDT (17:01 UTC)
Expired: Jul 21, 2016, 12:30 PM CDT
In force: 29 min
Issued by: NWS New Orleans, LA

County Orleans Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.0 hours before the alert went out and 54 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: 1965 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 21, 8:15 AM CDT, 3 hours 46 minutes earlier.

Area forecast discussion, Jul 21, 8:15 AM CDT, 3 hours 46 minutes before

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Hazardous weather outlook, Jul 21, 10:57 AM CDT, 1 hour 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1057 AM CDT THU JUL 21 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>082-220400-
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-
1057 AM CDT THU JUL 21 2016

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED TODAY. A FEW OF THESE STORMS
COULD BE STRONG AND PRODUCE GUSTY WINDS...FREQUENT LIGHTNING AND
BRIEF HEAVY DOWNPOURS OF RAIN. OTHERWISE...NO HAZARDOUS WEATHER IS
EXPECTED TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SCATTERED THUNDERSTORMS ARE EXPECTED EACH DAY WITH THE HIGHEST
CHANCES FRIDAY AND TUESDAY. A FEW STORMS EACH DAY COULD BRIEFLY
BECOME STRONG AND PRODUCE FREQUENT LIGHTNING...GUSTY WINDS AND
LOCALLY HEAVY RAINFALL. AN ISOLATED SEVERE THUNDERSTORM WILL BE
POSSIBLE FRIDAY AND TUESDAY WITH THE MAIN HAZARDS BEING DAMAGING
WINDS...FREQUENT LIGHTNING AND LOCALLY HEAVY RAINFALL.

OUTSIDE THUNDERSTORM AREAS...HIGH TEMPERATURES TODAY AND FRIDAY
ARE EXPECTED TO REACH THE MID 90S WITH HEAT INDEX READINGS
BETWEEN 103 AND 107 DEGREES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

32

In the hours before

Special weather statement, Jul 21, 10:53 AM CDT, 1 hour 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1053 AM CDT THU JUL 21 2016

LAZ069-211630-
LOWER PLAQUEMINES-
1053 AM CDT THU JUL 21 2016

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN PLAQUEMINES
PARISH...

AT 1052 AM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR POINTE A LA
HACHE...OR 11 MILES NORTH OF PORT SULPHUR...MOVING WEST AT 10 MPH.

WINDS IN EXCESS OF 30 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
PORT SULPHUR AND POINTE A LA HACHE.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 2946 8988 2967 8996 2973 8991 2975 8970
      2967 8967 2967 8968 2966 8967 2964 8966
      2963 8966 2963 8969 2961 8969 2961 8974
      2957 8970 2957 8971 2956 8971 2956 8969
      2955 8970
TIME...MOT...LOC 1552Z 071DEG 8KT 2965 8975

Special weather statement, Jul 21, 11:33 AM CDT, 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1133 AM CDT THU JUL 21 2016

LAZ069-070-211700-
LOWER ST. BERNARD-LOWER PLAQUEMINES-
1133 AM CDT THU JUL 21 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. BERNARD AND
NORTH CENTRAL PLAQUEMINES PARISHES...

AT 1133 AM CDT...A STRONG THUNDERSTORM WAS LOCATED 11 MILES
NORTHEAST OF POINTE A LA HACHE...OR 15 MILES NORTH OF PORT SULPHUR.
THE STORM IS NEARLY STATIONARY.

WINDS IN EXCESS OF 40 MPH ARE POSSIBLE WITH THIS STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHWESTERN LOWER
ST. BERNARD AND NORTHWESTERN LOWER PLAQUEMINES PARISHES.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 2958 8979 2978 8986 2979 8966 2975 8964
      2975 8965 2971 8965 2971 8963 2967 8961
      2966 8963 2968 8963 2967 8965 2969 8967
      2967 8966 2967 8968 2965 8966 2966 8965
      2965 8965
TIME...MOT...LOC 1633Z 075DEG 3KT 2972 8970

Special weather statement, Jul 21, 12:01 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1201 PM CDT THU JUL 21 2016

LAZ064-069-070-211730-
LOWER ST. BERNARD-LOWER PLAQUEMINES-UPPER ST. BERNARD-
1201 PM CDT THU JUL 21 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. BERNARD AND
NORTH CENTRAL PLAQUEMINES PARISHES...

AT 1201 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 13 MILES
SOUTHEAST OF POYDRAS...OR 18 MILES NORTH OF PORT SULPHUR...MOVING
NORTHWEST AT 10 MPH.

WINDS IN EXCESS OF 30 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
POYDRAS.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 2978 8987 2979 8985 2984 8990 2991 8974
      2987 8970 2987 8961 2976 8958 2973 8960
      2974 8959 2972 8958 2972 8963 2973 8961
      2974 8961 2976 8963 2974 8965 2971 8965
      2970 8962 2965 8974
TIME...MOT...LOC 1701Z 152DEG 7KT 2976 8970

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 9:12 AM CDT	Special Marine Warning	LIX		33 min
Jul 21, 9:13 AM CDT	Special Marine Warning	LIX		32 min
Jul 21, 9:37 AM CDT	Special Marine Warning	LIX		53 min
Jul 21, 10:53 AM CDT	Special Weather Statement	LIX	Jefferson	37 min
Jul 21, 11:15 AM CDT	Special Marine Warning	LIX		30 min
Jul 21, 11:33 AM CDT	Special Weather Statement	LIX	Jefferson	27 min
Jul 21, 1:48 PM CDT	Special Weather Statement	LIX	Pointe Coupee	27 min
Jul 21, 2:12 PM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	33 min
Jul 21, 2:13 PM CDT	Special Weather Statement	LIX	Terrebonne	32 min
Jul 21, 2:26 PM CDT	Special Weather Statement	LIX	Saint Charles	34 min
Jul 21, 2:45 PM CDT	Special Weather Statement	LIX	East Feliciana	30 min
Jul 21, 3:30 PM CDT	Special Weather Statement	LIX	Terrebonne	30 min
Jul 21, 1:57 PM CDT	Special Weather Statement	LIX	Wilkinson	33 min
Jul 21, 2:51 PM CDT	Special Weather Statement	LIX	Jackson	39 min
Jul 21, 2:52 PM CDT	Special Weather Statement	LIX	Wilkinson	38 min

Nearby

Special Weather Statements in Louisiana, 2016 Every special weather statement 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.