Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

August 31, 2021Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 31, 2021, 1:21 PM CDT for Saint Bernard Parish, Louisiana. It was in force for 39 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: Aug 31, 2021, 1:21 PM CDT (18:21 UTC)
Expired: Aug 31, 2021, 2:00 PM CDT
In force: 39 min
Issued by: NWS New Orleans, LA
Hail: 0.00 in
Wind: 30

County Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.4 hours before the alert went out and 53 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: 321 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 871 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

396 
WWUS84 KLIX 311821
SPSLIX

Special Weather Statement
National Weather Service New Orleans LA
Issued by National Weather Service Lake Charles LA
121 PM CDT Tue Aug 31 2021
 
LAZ064-070-311900-
Upper St. Bernard LA-Lower St. Bernard LA-
121 PM CDT Tue Aug 31 2021

...Strong thunderstorms will impact portions of central St. Bernard
Parish through 200 PM CDT...

At 120 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 26 miles southeast of Lake Catherine to Shell
Beach. Movement was southeast at 15 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

These storms will remain over mainly rural areas of central St.
Bernard Parish.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2979 8939 2975 8942 2980 8947 2976 8947
      2976 8948 2975 8946 2972 8943 2972 8945
      2977 8976 2993 8983 2993 8974 2986 8968
      2988 8960 2993 8959 2992 8938 2982 8934
      2981 8937 2980 8929 2976 8927
TIME...MOT...LOC 1820Z 296DEG 12KT 2982 8941 2985 8968 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 4:06 AM CDT	Heat Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more	38 hr
Aug 31, 10:02 AM CDT	Special Marine Warning	LIX		118 min
Aug 31, 1:58 PM CDT	Special Weather Statement	LIX	Saint Bernard	32 min
Aug 31, 2:49 PM CDT	Flash Flood Warning Considerable damage threat	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	88 min
Aug 31, 3:52 PM CDT	Special Weather Statement	LIX	Saint Charles	53 min
Aug 31, 4:23 PM CDT	Special Marine Warning	LIX		2 hr
Aug 31, 4:36 PM CDT	Special Weather Statement	LIX	Lafourche	24 min
Aug 31, 4:44 PM CDT	Flash Flood Warning Considerable damage threat	LIX	Lafourche, Saint James, Saint John the Baptist	3 hr
Aug 31, 5:05 PM CDT	Special Weather Statement	LIX	Lafourche	25 min
Aug 31, 5:22 PM CDT	Special Weather Statement	LIX	Assumption	53 min
Aug 31, 6:20 PM CDT	Flash Flood Warning Considerable damage threat	LIX	Saint Charles, Saint John the Baptist	49 min
Aug 31, 6:50 PM CDT	Flash Flood Warning	LIX	Assumption, Lafourche, Terrebonne	42 min
Aug 30, 9:28 PM CDT	Flash Flood Warning	LIX	Hancock, Harrison, Jackson, Pearl River	9 hr
Aug 30, 9:55 PM CDT	River Flood Warning	LIX	Jackson	61 hr

Nearby

Special Weather Statements in Louisiana, 2021 Every special weather statement 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.