Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 1, NWS New Orleans, LA

January 7, 2021Saint Helena Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Jan 7, 2021, 12:57 AM CST for Saint Helena Parish, Louisiana. It was in force for 18 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, 12:57 AM CST (06:57 UTC)
Expired
Jan 7, 2021, 1:15 AM CST
In force
18 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Saint Helena Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.0 hours before the alert went out and 108 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.

245 
WFUS54 KLIX 070657
TORLIX
LAC091-070715-
/O.NEW.KLIX.TO.W.0001.210107T0657Z-210107T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New Orleans LA
1257 AM CST Thu Jan 7 2021

The National Weather Service in New Orleans has issued a

* Tornado Warning for...
  Southern St. Helena Parish in southeastern Louisiana...

* Until 115 AM CST.
    
* At 1256 AM CST, a severe thunderstorm capable of producing a
  tornado was located near Montpelier, or 9 miles southwest of
  Greensburg, moving northeast at 40 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Montpelier around 105 AM CST.
  Greensburg around 110 AM CST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

&&

LAT...LON 3068 9057 3067 9056 3065 9060 3065 9080
      3072 9085 3072 9084 3075 9085 3094 9057
TIME...MOT...LOC 0656Z 237DEG 36KT 3071 9074 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$
1 follow-up statement
019 
WWUS54 KLIX 070711
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
111 AM CST Thu Jan 7 2021

LAC091-070721-
/O.EXP.KLIX.TO.W.0001.000000T0000Z-210107T0715Z/
St. Helena LA-
111 AM CST Thu Jan 7 2021

...THE TORNADO WARNING FOR SOUTHERN ST. HELENA PARISH WILL EXPIRE AT
115 AM CST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 3068 9057 3067 9056 3065 9060 3065 9080
      3072 9085 3072 9084 3075 9085 3094 9057
TIME...MOT...LOC 0711Z 237DEG 36KT 3079 9060 

$$

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, 1:01 AM CSTSpecial Marine WarningLIX59 min
Jan 7, 1:30 AM CSTSpecial Weather StatementLIXOrleans60 min
Jan 7, 1:31 AM CSTSpecial Weather StatementLIXJefferson, Plaquemines59 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

Nearby

Tornado Warnings in Louisiana, 2021Every tornado warning in 2021Tornadoes 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.