Alert archive / Louisiana / Extreme Wind Warnings in 2021

Extreme Wind Warning 1, NWS New Orleans, LA

August 29, 20216 parishes in Louisiana

NWS New Orleans, LA issued this extreme wind warning at Aug 29, 2021, 7:49 AM CDT for 6 parishes in Louisiana. It was in force for 3 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
Aug 29, 2021, 7:49 AM CDT (12:49 UTC)
Expired
Aug 29, 2021, 10:45 AM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon

Counties Jefferson Parish, LA, Lafourche Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.8 hours before the alert went out and 107 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2021-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2021-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3256 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted.

218 
WFUS54 KLIX 291249
EWWLIX
LAC051-057-075-087-089-109-291545-
/O.NEW.KLIX.EW.W.0001.210829T1249Z-210829T1545Z/

BULLETIN - EAS ACTIVATION REQUESTED
Extreme Wind Warning
National Weather Service New Orleans LA
749 AM CDT Sun Aug 29 2021

The National Weather Service in New Orleans has issued a

* Extreme Wind Warning for...
  West central St. Bernard Parish in southeastern Louisiana...
  Southern St. Charles Parish in southeastern Louisiana...
  Terrebonne Parish in southeastern Louisiana...
  Lafourche Parish in southeastern Louisiana...
  Jefferson Parish in southeastern Louisiana...
  Plaquemines Parish in southeastern Louisiana...

* Until 1045 AM CDT.

* At 747 AM CDT, NOAA Hurricane reconnaissance aircraft and maritime 
  observations indicated extreme winds, associated with the eyewall 
  of Hurricane Ida, will move onshore portions of southeastern 
  Louisiana. THIS IS AN EXTREMELY DANGEROUS AND LIFE-THREATENING 
  SITUATION!

* Locations impacted include... 
  Houma, Cut Off, Galliano, Larose, Belle Chasse, Port Sulphur,
  Timberlane, Marrero, Harvey, Lockport, Golden Meadow, Jean Lafitte,
  Mathews, Chauvin, Empire, Dulac, Buras, Poydras, Myrtle Grove and
  Raceland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Widespread destructive winds of 115 to 150 mph will spread across 
St. Bernard Parish,  St. Charles Parish,  Terrebonne Parish, 
Lafourche Parish,  Jefferson Parish,  Plaquemines Parish, producing 
swaths of tornado-like damage.

TAKE COVER NOW! Treat these imminent extreme winds as if a tornado
was approaching and move immediately to the safe room in your
shelter. Take action now to protect your life!

The safest place to be during a major landfalling hurricane is in a
reinforced interior room away from windows. Get under a table or
other piece of sturdy furniture. Use mattresses, blankets or pillows
to cover your head and body. Remain in place through the passage of
these life-threatening conditions.

&&

A Tornado Watch remains in effect until 700 PM CDT for southeastern
Louisiana.

LAT...LON 2925 8950 2930 8990 2941 8978 2949 8990
      2910 9019 2937 9049 2921 9056 2923 9053
      2921 9054 2911 9083 2948 9113 2986 9051
      2987 8986 2940 8952 2941 8957 2940 8957
      2913 8906 2904 8931 2919 8934 2895 8940
TIME...MOT...LOC 1247Z 139DEG 13KT 2883 8986 

$$

KLG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 6:23 AM CDTSpecial Marine WarningLIX22 min
Aug 29, 10:30 AM CDTExtreme Wind WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles, Terrebonne3 hr
Aug 29, 1:26 PM CDTExtreme Wind WarningLIXAssumption, Jefferson, Lafourche, Plaquemines, Saint Charles, Saint James and 2 more3 hr
Aug 29, 2:42 PM CDTSpecial Marine WarningLIX18 min
Aug 29, 3:39 PM CDTFlash Flood WarningLIXLafourche, Terrebonne7 hr
Aug 29, 4:08 PM CDTFlash Flood Warning EmergencyLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist8 hr
Aug 29, 4:23 PM CDTExtreme Wind WarningLIXJefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist, Terrebonne2 hr
Aug 29, 5:01 PM CDTFlash Flood Warning EmergencyCatastrophic damage threatLIXPlaquemines6 hr
Aug 29, 5:04 PM CDTSpecial Marine WarningLIX26 min
Aug 29, 6:04 PM CDTSpecial Marine WarningLIX26 min
Aug 29, 6:09 PM CDTFlash Flood WarningLIXSaint Tammany8 hr
Aug 29, 6:21 PM CDTFlash Flood WarningLIXSaint Tammany16 hr
Aug 29, 6:25 PM CDTTornado WarningLIXOrleans, Saint Bernard, Saint Tammany35 min
Aug 29, 6:33 PM CDTSpecial Marine WarningLIX57 min
Aug 29, 6:54 PM CDTTornado WarningLIXSaint Tammany36 min

Nearby

Extreme Wind Warnings in Louisiana, 2021Every extreme wind warning in 2021

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.