Alert archive / Louisiana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 137, NWS New Orleans, LA

August 8, 20154 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 8, 2015, 9:29 PM CDT for 4 parishes in Louisiana. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 8, 2015, 9:29 PM CDT (02:29 UTC)
Expired: Aug 8, 2015, 10:30 PM CDT
In force: 61 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.5 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: 2734 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1432 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Aug 8, 8:26 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Aug 8, 8:26 PM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, Aug 8, 6:56 PM CDT, 2 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
656 PM CDT SAT AUG 8 2015

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>082-091200-
LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND-
LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND-
COASTAL WATERS FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER OUT
20 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO PORT FOURCHON OUT 20 NM-
COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER OUT 20 NM-
COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA OUT 20 NM-
COASTAL WATERS FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER FROM
20 TO 60 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO PORT FOURCHON FROM 20 TO 60 NM-
COASTAL WATERS FROM STAKE ISLAND LA TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER FROM 20 TO 60 NM-
COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA FROM 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-
656 PM CDT SAT AUG 8 2015

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

.DAY ONE...TONIGHT

OPPRESSIVE HEAT WILL CONTINUE. OVERNIGHT LOWS WILL REMAIN ABOVE
77 DEGREES AREA WIDE WITH SEVERAL SPOTS REMAINING IN THE 80S
THROUGH EARLY SUNDAY MORNING. THEREFORE...THE HEAT ADVISORY HAS
BEEN UPGRADED TO AN EXCESSIVE HEAT WARNING.

THERE IS A LOW CHANCE OF THUNDERSTORMS MAINLY OVER EXTREME SOUTH
CENTRAL MISSISSIPPI AND COASTAL MISSISSIPPI THIS EVENING. ANY
STORMS THAT DO TRACK SOUTH COULD REMAIN STRONG TO MARGINALLY
SEVERE...CAPABLE OF PRODUCING DAMAGING WIND GUSTS...FREQUENT TO
CONTINUOUS LIGHTNING...AND BRIEF TORRENTIAL RAINFALL.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

AN EXCESSIVE HEAT WARNING IS IN EFFECT FOR SUNDAY AND MONDAY
ACROSS THE ENTIRE AREA. HEAT INDEX VALUES OF 110 TO 115 ARE
EXPECTED ACROSS THE AREA TOMORROW AND MONDAY. OVERNIGHT LOWS
AROUND 80 DEGREES WILL PROVIDE LITTLE OR NO RELIEF. OPPRESSIVE
CONDITIONS WILL CONTINUE THROUGH EARLY NEXT WEEK BEFORE SLOWLY
EASING LATER IN THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED. HOWEVER...IF WIND DAMAGE
IS OBSERVED FROM THUNDERSTORMS LATER TODAY...PLEASE FORWARD THESE
REPORTS TO THE NATIONAL WEATHER SERVICE OFFICE IN SLIDELL.

In the hours before

Special weather statement, Aug 8, 4:57 PM CDT, 4 hours 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
457 PM CDT SAT AUG 8 2015

MSZ081-082-082300-
JACKSON-HARRISON-
457 PM CDT SAT AUG 8 2015

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN HARRISON AND
NORTHWESTERN JACKSON COUNTIES...

AT 455 PM CDT...A CLUSTER OF STRONG THUNDERSTORM WAS 11 MILES WEST
OF LUCEDALE...MOVING SOUTH AT 20 MPH. THESE STORMS WILL ENTER
JACKSON COUNTY AROUND 515 PM.

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

LOCATIONS IMPACTED INCLUDE...
GULFPORT...BILOXI...WADE...VANCLEAVE AND LATIMER.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM 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 3056 8851 3044 8908 3068 8907 3068 8889
      3074 8888 3073 8859
TIME...MOT...LOC 2155Z 343DEG 16KT 3087 8878

Special weather statement, Aug 8, 6:01 PM CDT, 3 hours 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
601 PM CDT SAT AUG 8 2015

MSZ081-082-082330-
JACKSON-HARRISON-
601 PM CDT SAT AUG 8 2015

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL HARRISON AND
SOUTHERN JACKSON COUNTIES...

AT 601 PM CDT...A STRONG THUNDERSTORM WAS OVER HICKORY HILLS...OR 7
MILES SOUTHWEST OF ESCATAWPA...MOVING SOUTH AT 25 MPH.

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

LOCATIONS IMPACTED INCLUDE...
BILOXI...OCEAN SPRINGS...MOSS POINT...ST. MARTIN...ESCATAWPA...
GAUTIER...D'IBERVILLE...GULF HILLS...HELENA...LATIMER...GULF PARK
ESTATES...HICKORY HILLS AND VANCLEAVE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 3036 8841 3032 8848 3037 8859 3034 8870
      3037 8882 3036 8882 3038 8884 3038 8878
      3043 8885 3043 8892 3040 8887 3039 8886
      3039 8899 3041 8899 3042 8892 3043 8898
      3054 8896 3053 8840
TIME...MOT...LOC 2301Z 348DEG 23KT 3043 8865

Special weather statement, Aug 8, 8:18 PM CDT, 1 hour 11 minutes before

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Special weather statement, Aug 8, 8:24 PM CDT, 1 hour 5 minutes before

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Special weather statement, Aug 8, 9:12 PM CDT, 17 minutes before

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Special weather statement, Aug 8, 9:21 PM CDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 9:03 PM CDT	Special Marine Warning	LIX		27 min
Aug 8, 9:12 PM CDT	Special Weather Statement	LIX	Saint Tammany	48 min
Aug 8, 9:14 PM CDT	Special Marine Warning	LIX		61 min
Aug 8, 9:17 PM CDT	Special Marine Warning	LIX		58 min
Aug 8, 9:21 PM CDT	Special Weather Statement	LIX	Orleans	24 min
Aug 8, 9:58 PM CDT	Special Marine Warning	LIX		62 min
Aug 8, 10:39 PM CDT	Special Marine Warning	LIX		66 min
Aug 9, 4:15 PM CDT	Special Weather Statement	LIX	Saint Bernard	45 min
Aug 9, 5:18 PM CDT	Special Marine Warning	LIX		27 min
Aug 9, 5:20 PM CDT	Special Weather Statement	LIX	Plaquemines	55 min
Aug 9, 5:22 PM CDT	Special Marine Warning	LIX		53 min
Aug 9, 6:07 PM CDT	Special Marine Warning	LIX		53 min
Aug 8, 7:23 PM CDT	Severe Thunderstorm Warning	LIX	Pike, Walthall	37 min
Aug 8, 8:18 PM CDT	Special Weather Statement	LIX	Harrison	27 min
Aug 8, 8:24 PM CDT	Special Weather Statement	LIX	Pearl River	36 min
Aug 8, 8:31 PM CDT	Severe Thunderstorm Warning	LIX	Pearl River	44 min
Aug 8, 8:50 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Pearl River	40 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2015 Every severe thunderstorm warning in 2015

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.