Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

August 23, 2021Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 23, 2021, 5:21 PM CDT for Saint Tammany Parish, Louisiana. It was in force for 24 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 23, 2021, 5:21 PM CDT (22:21 UTC)
Expired: Aug 23, 2021, 5:45 PM CDT
In force: 24 min
Issued by: NWS New Orleans, LA
Hail: 0.00 in
Wind: 50

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.4 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: 766 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1180 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

011 
WWUS84 KLIX 232221
SPSLIX

Special Weather Statement
National Weather Service New Orleans LA
521 PM CDT Mon Aug 23 2021
 
LAZ058-072-075-232245-
Northwest St. Tammany LA-Southern Tangipahoa LA-
St. John The Baptist LA-
521 PM CDT Mon Aug 23 2021

...A strong thunderstorm will impact portions of northeastern St.
John The Baptist, west central St. Tammany and southeastern
Tangipahoa Parishes through 545 PM CDT...

At 519 PM CDT, Doppler radar was tracking a strong thunderstorm near 
the parish line between Covington and Robert, moving south at 20 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Covington and Madisonville. 

This includes Interstate 12 between mile markers 48 and 61.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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 3054 9012 3037 9010 3037 9012 3039 9021
      3034 9028 3031 9029 3030 9031 3029 9030
      3024 9036 3052 9033
TIME...MOT...LOC 2219Z 354DEG 15KT 3046 9022 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

$$

TD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 5:42 AM CDT	Special Marine Warning	LIX		63 min
Aug 23, 6:45 AM CDT	Special Marine Warning	LIX		60 min
Aug 23, 7:45 AM CDT	Special Marine Warning	LIX		60 min
Aug 23, 8:42 AM CDT	Special Marine Warning	LIX		93 min
Aug 23, 1:57 PM CDT	Heat Advisory	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more	29 hr
Aug 23, 4:29 PM CDT	Special Marine Warning	LIX		91 min
Aug 23, 5:01 PM CDT	Special Weather Statement	LIX	Tangipahoa	44 min
Aug 23, 5:15 PM CDT	Special Marine Warning	LIX		90 min
Aug 23, 5:33 PM CDT	Special Weather Statement	LIX	East Baton Rouge	42 min
Aug 23, 5:52 PM CDT	Special Weather Statement	LIX	Saint Tammany	38 min
Aug 23, 5:55 PM CDT	Special Marine Warning	LIX		95 min
Aug 23, 5:59 PM CDT	Special Weather Statement	LIX	Ascension	46 min
Aug 23, 6:03 PM CDT	Special Weather Statement	LIX	Saint John the Baptist	42 min
Aug 23, 6:37 PM CDT	Special Marine Warning	LIX		83 min
Aug 23, 4:29 PM CDT	Special Weather Statement	LIX	Jackson	46 min
Aug 23, 6:09 PM CDT	Special Weather Statement	LIX	Harrison	21 min
Aug 23, 6:19 PM CDT	Special Weather Statement	LIX	Harrison	26 min
Aug 23, 6:49 PM CDT	Special Weather Statement	LIX	Harrison	41 min

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.