Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

March 16, 2021Union Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Mar 16, 2021, 6:40 PM CDT for Union Parish, Louisiana. It was in force for 50 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, 6:40 PM CDT (23:40 UTC)
Expired
Mar 16, 2021, 7:30 PM CDT
In force
50 min
Issued by
NWS Shreveport, LA

County Union Parish, LA

The radar

The Shreveport radar (KSHV), 173 km from the middle of the area, began a volume at 23:40 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

Jackson, MS (KJAN), launched 12:00Z, 11.7 hours before the alert went out and 208 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, Jackson, MS at 12:00Z on 2021-03-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 812 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, Jackson, MS at 12:00Z on 2021-03-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
812 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
660 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

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 Shreveport, LA wrote its last area forecast discussion before this special weather statement went out at Mar 16, 5:28 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Mar 16, 5:28 PM CDT, 1 hour 12 minutes before
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Hazardous weather outlook, Mar 16, 1:02 PM CDT, 5 hours 38 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
102 PM CDT Tue Mar 16 2021

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-171815-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-
Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-
Grant-Caldwell-La Salle-McCurtain-Bowie-Franklin-Titus-Camp-
Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
102 PM CDT Tue Mar 16 2021

This Hazardous Weather Outlook is for portions of south central
Arkansas, southwest Arkansas, north central Louisiana, northwest
Louisiana, southeast Oklahoma, east Texas and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

Isolated thunderstorms will remain possible this afternoon, with
the best chances across areas of Northeast and Central Louisiana,
along with portions of Deep East Texas. Thunderstorms will
increase in coverage and intensity as we head into this evening
and through the overnight hours. Large hail and damaging winds
will be the main threat, however, a tornado cannot be completely
ruled out.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Thunderstorms will increase across the area on Wednesday as a
cold front begins to push through the region. Widespread severe
thunderstorms capable of producing tornadoes, large hail, and
damaging wind gusts are expected. The greatest threat for the
strongest storms will be across portions of northwest and north
central Louisiana and southwest Arkansas.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators, and storm spotters will be needed late Tuesday through
Wednesday afternoon.

In the hours before

Special weather statement, Mar 16, 2:08 PM CDT, 4 hours 32 minutes before
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Special weather statement, Mar 16, 4:40 PM CDT, 2 hours before
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Special weather statement, Mar 16, 5:30 PM CDT, 1 hour 10 minutes before
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Special weather statement, Mar 16, 5:34 PM CDT, 1 hour 6 minutes before
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Special weather statement, Mar 16, 5:44 PM CDT, 56 minutes before
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Special weather statement, Mar 16, 6:40 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Shreveport LA
640 PM CDT Tue Mar 16 2021

ARZ073-LAZ006-170030-
Union AR-Union LA-
640 PM CDT Tue Mar 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN UNION COUNTY IN
SOUTH CENTRAL ARKANSAS AND NORTHEASTERN UNION PARISHES UNTIL 730 PM
CDT...

At 640 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles northeast of Farmerville, or 12 miles south of Huttig, moving
northeast at 30 mph.

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

Locations impacted include...
Huttig, Marion, Felsenthal, Cecil, Linville, Litroe and Haile.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

This storm 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 3298 9208 3297 9207 3295 9208 3278 9218
      3285 9235 3318 9217 3316 9217 3317 9215
      3316 9211 3312 9212 3311 9214 3307 9213
      3307 9211 3303 9211 3303 9209 3300 9207
TIME...MOT...LOC 2340Z 204DEG 28KT 3287 9224

19

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, 2:08 PM CDTSpecial Weather StatementSHVLaSalle52 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, 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.