Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

January 7, 2021Jefferson Parish, Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jan 7, 2021, 1:31 AM CST for Jefferson Parish, Plaquemines Parish, Louisiana. It was in force for 59 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
Jan 7, 2021, 1:31 AM CST (07:31 UTC)
Expired
Jan 7, 2021, 2:30 AM CST
In force
59 min
Issued by
NWS New Orleans, LA

Counties Jefferson Parish, LA, Plaquemines Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.5 hours before the alert went out and 86 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 00:00Z on 2021-01-07Temperature 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 00:00Z on 2021-01-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 232 square meters per square second.19395878Sfc1 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
807 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
232 m²/s²
0-3 km storm-relative helicity
317 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 Jan 7, 12:10 AM CST, 1 hour 21 minutes earlier.

Area forecast discussion, Jan 7, 12:10 AM CST, 1 hour 21 minutes before
Area Forecast Discussion
National Weather Service New Orleans LA
1210 AM CST Thu Jan 7 2021

.AVIATION...

.VALID 06Z 1/7 thru 12Z 1/8...

Between now and 14z, a band of showers will pass over the terminals.
The heaviest showers will occur with a frontal passage and will
bring gusty winds, IFR visibilities and MVFR ceilings to the
terminals for an hour or so. After the band of convection moves
through, winds will shift to the west and remain gusty at 15 to 20
knots through tomorrow afternoon. A 925mb thermal trough axis will
also keep a low stratus deck in place through Friday morning
resulting in prevailing IFR and MVFR ceilings. PG

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  55  37  48  30 /  10   0   0   0
BTR  54  40  49  32 /   0   0   0   0
ASD  60  40  52  32 /  10   0   0   0
MSY  58  42  51  37 /   0   0   0   0
GPT  62  40  53  32 /  50   0   0   0
PQL  63  41  53  30 /  90   0   0   0

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...Small Craft Advisory until 6 PM CST Friday for GMZ530-532-534-
     536-538-550-552-555-557-570-572-575-577.

MS...None.
GM...Small Craft Advisory until 6 PM CST Friday for GMZ532-534-536-
     538-550-552-555-557-570-572-575-577.

&&

In the hours before

Special weather statement, Jan 6, 11:11 PM CST, 2 hours 20 minutes before
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Special weather statement, Jan 6, 11:32 PM CST, 1 hour 59 minutes before
Special Weather Statement
National Weather Service New Orleans LA
1132 PM CST Wed Jan 6 2021

LAZ056-065-066-070615-
Lower Terrebonne-Upper Terrebonne-Assumption-
1132 PM CST Wed Jan 6 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN TERREBONNE AND
SOUTH CENTRAL ASSUMPTION PARISHES...

At 1132 PM CST, a strong thunderstorm was located 9 miles south of
Bayou Vista, moving east at 35 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Houma, Schriever, Gray and Dulac.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 2954 9127 2956 9123 2961 9118 2959 9116
      2963 9108 2965 9111 2969 9110 2972 9095
      2971 9091 2974 9082 2943 9070 2946 9126
      2948 9128
TIME...MOT...LOC 0532Z 263DEG 31KT 2956 9127
Special weather statement, Jan 7, 12:31 AM CST, 1 hour before
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Special weather statement, Jan 7, 12:51 AM CST, 40 minutes before
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Special weather statement, Jan 7, 1:30 AM CST, 1 minute before
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Special weather statement, Jan 7, 1:31 AM CST, 0 minutes before
Special Weather Statement
National Weather Service New Orleans LA
131 AM CST Thu Jan 7 2021

LAZ067>070-070830-
Lower Plaquemines-Lower Jefferson-Lower St. Bernard-Lower Lafourche-
131 AM CST Thu Jan 7 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN ST.
BERNARD...SOUTHEASTERN LAFOURCHE...SOUTHEASTERN JEFFERSON AND
NORTHERN PLAQUEMINES PARISHES...

At 131 AM CST, radar indicated strong thunderstorms were located
along a line extending from 12 miles east of Golden Meadow to near
Port Fourchon. Movement was northeast at 55 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
Port Sulphur, Boothville-venice, Boothville, Pointe A La Hache,
Empire, Buras, Buras-triumph, Boothville Asos and Grand Isle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 2947 9013 2989 8923 2965 8951 2965 8945
      2963 8947 2968 8967 2953 8967 2953 8966
      2952 8966 2940 8952 2940 8954 2941 8957
      2939 8956 2933 8927 2935 8920 2933 8920
      2911 9017
TIME...MOT...LOC 0731Z 244DEG 47KT 2944 9007 2910 9010

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 6, 11:11 PM CSTSpecial Weather StatementLIXEast Baton Rouge, Iberville, West Baton Rouge49 min
Jan 6, 11:32 PM CSTSpecial Weather StatementLIXTerrebonne43 min
Jan 6, 11:58 PM CSTSpecial Marine WarningLIX62 min
Jan 7, 12:31 AM CSTSpecial Weather StatementLIXLafourche, Terrebonne59 min
Jan 7, 12:51 AM CSTSpecial Weather StatementLIXOrleans, Saint Charles54 min
Jan 7, 12:57 AM CSTTornado WarningLIXSaint Helena18 min
Jan 7, 1:01 AM CSTSpecial Marine WarningLIX59 min
Jan 7, 1:30 AM CSTSpecial Weather StatementLIXOrleans60 min
Jan 7, 1:33 AM CSTSpecial Marine WarningLIX57 min
Jan 7, 2:00 AM CSTSpecial Marine WarningLIX60 min
Jan 7, 2:05 AM CSTSpecial Marine WarningLIX55 min
Jan 7, 3:02 AM CSTSpecial Marine WarningLIX58 min
Jan 7, 3:04 AM CSTSpecial Marine WarningLIX56 min
Jan 7, 3:57 AM CSTSpecial Marine WarningLIX63 min
Jan 7, 4:31 AM CSTSpecial Marine WarningLIX29 min
Jan 7, 4:56 AM CSTSpecial Marine WarningLIX34 min
Jan 7, 5:44 AM CSTSpecial Marine WarningLIX31 min
Jan 7, 4:07 AM CSTSpecial Weather StatementLIXHarrison, Jackson38 min

Nearby

Special Weather Statements in Louisiana, 2021Every 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.