Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

April 16, 2021Grant Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Apr 16, 2021, 2:46 PM CDT for Grant Parish, Louisiana. It was in force for 44 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
Apr 16, 2021, 2:46 PM CDT (19:46 UTC)
Expired
Apr 16, 2021, 3:30 PM CDT
In force
44 min
Issued by
NWS Shreveport, LA

County Grant Parish, LA

The radar

The Ft Polk radar (KPOE), 59 km from the middle of the area, began a volume at 19:44 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, 7.8 hours before the alert went out and 157 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 2021-04-16Temperature 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, Shreveport, LA at 12:00Z on 2021-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 square meters per square second.1939587897117Sfc1 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
666 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
203 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 Shreveport, LA wrote its last area forecast discussion before this special weather statement went out at Apr 16, 2:46 PM CDT, 0 minutes earlier.

Area forecast discussion, Apr 16, 2:46 PM CDT, 0 minutes before
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Hazardous weather outlook, Apr 16, 6:06 AM CDT, 8 hours 40 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
606 AM CDT Fri Apr 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>167-171115-
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-
606 AM CDT Fri Apr 16 2021

This Hazardous Weather Outlook is for southern Arkansas, for
northern Louisiana, for eastern Texas and southeast Oklahoma.

.DAY ONE...Today and Tonight...

Showers and thunderstorms will be ongoing today ahead of an
approaching upper level disturbance with a surface low and a cold
front this evening. A few strong storms containing hail cannot be
ruled out along with some isolated areas of flooding possible as
storms train over the same areas, especially south of I-20.
No other hazardous weather is expected.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Cooler and drier weather is expected for the rest of the weekend
into the start of the new work week with arriving high pressure.
Another reinforcing cool front will arrive late on Tuesday with
limited moisture allowing for lesser amounts of rainfall.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators and storm spotters should not be needed through
tonight.

24

In the hours before

Special weather statement, Apr 16, 11:23 AM CDT, 3 hours 23 minutes before
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Special weather statement, Apr 16, 12:08 PM CDT, 2 hours 38 minutes before
Special Weather Statement
National Weather Service Shreveport LA
1208 PM CDT Fri Apr 16 2021

LAZ010-TXZ151-153-161800-
De Soto LA-Panola TX-Shelby TX-
1208 PM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DE SOTO PARISH...
SOUTHEASTERN PANOLA AND NORTHERN SHELBY COUNTIES UNTIL 100 PM CDT...

At 1207 PM CDT, Doppler radar was tracking a strong thunderstorm over
Timpson, or 17 miles northwest of Center, moving east at 45 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Logansport, Tenaha, Timpson, Joaquin, Huxley, Stanley, James and
Paxton.

LAT...LON 3184 9445 3186 9446 3187 9446 3188 9448
      3190 9448 3191 9450 3192 9451 3200 9451
      3204 9389 3180 9388
TIME...MOT...LOC 1707Z 269DEG 37KT 3190 9445

19
Special weather statement, Apr 16, 12:51 PM CDT, 1 hour 55 minutes before
Special Weather Statement
National Weather Service Shreveport LA
1251 PM CDT Fri Apr 16 2021

LAZ010-011-161845-
De Soto LA-Red River LA-
1251 PM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DE SOTO AND CENTRAL RED
RIVER PARISHES UNTIL 145 PM CDT...

At 1250 PM CDT, Doppler radar was tracking a strong thunderstorm over
Logansport, or 14 miles west of Mansfield, moving east at 45 mph.

Penny size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Mansfield, Coushatta, South Mansfield, Grand Cane, Edgefield,
Longstreet, Stanley, Carmel, Evelyn, Grand Bayou, Loggy Bayou,
Crichton and Armistead.

LAT...LON 3209 9400 3224 9340 3224 9335 3199 9328
      3191 9395
TIME...MOT...LOC 1750Z 255DEG 37KT 3199 9395

19
Special weather statement, Apr 16, 1:46 PM CDT, 1 hour before
Special Weather Statement
National Weather Service Shreveport LA
146 PM CDT Fri Apr 16 2021

LAZ010-017-018-161930-
De Soto LA-Natchitoches LA-Sabine LA-
146 PM CDT Fri Apr 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL DE SOTO...
SOUTHWESTERN NATCHITOCHES AND NORTHERN SABINE PARISHES UNTIL 230 PM
CDT...

At 146 PM CDT, Doppler radar was tracking a strong thunderstorm over
Converse, or 20 miles south of Mansfield, moving east at 45 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Many, Zwolle, Converse, Oak Grove, Pleasant Hill, Provencal, Noble,
Robeline, Belmont, Pelican, Toledo Bend Reservoir North, Marthaville
and Hagewood.

LAT...LON 3165 9382 3168 9382 3169 9380 3170 9380
      3170 9381 3192 9373 3177 9316 3149 9324
TIME...MOT...LOC 1846Z 286DEG 39KT 3174 9371

13
Local storm report, Apr 16, 2:28 PM CDT, 18 minutes before
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Special weather statement, Apr 16, 2:46 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 10:31 AM CDTSpecial Weather StatementSHVCherokee44 min
Apr 16, 11:23 AM CDTSpecial Weather StatementSHVNacogdoches52 min
Apr 16, 12:08 PM CDTSpecial Weather StatementSHVShelby52 min
Apr 16, 12:51 PM CDTSpecial Weather StatementSHVDe Soto, Red River54 min
Apr 16, 1:46 PM CDTSpecial Weather StatementSHVSabine44 min
Apr 16, 2:03 PM CDTSevere Thunderstorm WarningSHVDe Soto, Natchitoches, Sabine42 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.