Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

March 16, 2021LaSalle Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Mar 16, 2021, 2:08 PM CDT for LaSalle Parish, Louisiana. It was in force for 52 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
Mar 16, 2021, 2:08 PM CDT (19:08 UTC)
Expired
Mar 16, 2021, 3:00 PM CDT
In force
52 min
Issued by
NWS Shreveport, LA

County LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 90 km from the middle of the area, began a volume at 19:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.1 hours before the alert went out and 173 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, Shreveport, LA at 12:00Z on 2021-03-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 108 joules per kilogram.LCLLFCEL10008507005003002001001 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, Shreveport, LA at 12:00Z on 2021-03-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 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
108 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
639 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

056 
WWUS84 KSHV 161908
SPSSHV

Special Weather Statement
National Weather Service Shreveport LA
208 PM CDT Tue Mar 16 2021
 
LAZ020-022-162000-
La Salle LA-Grant LA-
208 PM CDT Tue Mar 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL GRANT AND CENTRAL LA
SALLE PARISHES UNTIL 300 PM CDT...

At 208 PM CDT, Doppler radar was tracking a strong thunderstorm near
Midway, or 26 miles northeast of Pineville, moving northeast at 45
mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Jena, Midway, Nebo and Rogers. 

LAT...LON 3150 9232 3167 9241 3192 9201 3156 9201
TIME...MOT...LOC 1908Z 237DEG 37KT 3167 9221 

$$

50

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 15, 10:19 PM CDTSpecial Weather StatementSHVNacogdoches41 min
Mar 16, 12:32 AM CDTSpecial Weather StatementSHVShelby43 min
Mar 15, 11:51 PM CDTSpecial Weather StatementSHVUnion24 min
Mar 16, 2:36 AM CDTSpecial Weather StatementSHVBienville39 min
Mar 16, 4:40 PM CDTSpecial Weather StatementSHVGrant50 min
Mar 16, 5:30 PM CDTSpecial Weather StatementSHVLaSalle45 min
Mar 16, 5:34 PM CDTSpecial Weather StatementSHVWinn41 min
Mar 16, 5:44 PM CDTSpecial Weather StatementSHVUnion46 min
Mar 16, 6:04 PM CDTSevere Thunderstorm WarningSHVCaldwell, Jackson, Ouachita, Winn31 min
Mar 16, 6:40 PM CDTSpecial Weather StatementSHVUnion50 min
Mar 16, 3:40 AM CDTSpecial Weather StatementSHVUnion50 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; radar from the NEXRAD Level II archive.