Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

May 17, 2021Sabine County, Texas; De Soto Parish, Red River Parish, Sabine Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at May 17, 2021, 1:02 PM CDT for Sabine County, Texas; De Soto Parish, Red River Parish, Sabine Parish, Louisiana. It was in force for 43 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: May 17, 2021, 1:02 PM CDT (18:02 UTC)
Expired: May 17, 2021, 1:45 PM CDT
In force: 43 min
Issued by: NWS Shreveport, LA

Counties De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Sabine County, TX

The radar

The Shreveport radar (KSHV), 67 km from the middle of the area, began a volume at 18:03 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, 6.0 hours before the alert went out and 68 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 269 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 212 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 May 17, 12:51 PM CDT, 11 minutes earlier.

Area forecast discussion, May 17, 12:51 PM CDT, 11 minutes before

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Hazardous weather outlook, May 17, 12:46 PM CDT, 16 minutes before

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In the hours before

Local storm report, May 17, 11:18 AM CDT, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1118 AM CDT MON MAY 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1017 AM     FLASH FLOOD      PINELAND                31.25N 93.97W
05/17/2021                   SABINE             TX   BROADCAST MEDIA

            SOME ROADS AND AREAS IN SABINE COUNTY ARE
            EXPERIENCING FLOODING: HIGHWAY 87 S
            YELLOWPINE AREA 96 IN BROOKELAND HIGHWAY 21
            TO NACOGDOCHES ANGELINA RIVER.

&&

25

Special weather statement, May 17, 12:13 PM CDT, 49 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1213 PM CDT Mon May 17 2021

LAZ001-010-017-TXZ151>153-166-171800-
De Soto LA-Caddo LA-Sabine LA-Panola TX-Nacogdoches TX-
San Augustine TX-Shelby TX-
1213 PM CDT Mon May 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR DE SOTO...SOUTHWESTERN CADDO AND
NORTHWESTERN SABINE PARISHES...SOUTHEASTERN PANOLA...EAST CENTRAL
NACOGDOCHES...SHELBY AND NORTHERN SAN AUGUSTINE COUNTIES UNTIL 100 PM
CDT...

At 1213 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles south of Deberry to 8 miles northwest
of Joaquin to near Tenaha to 6 miles northeast of Martinsville to
Melrose. Movement was east at 25 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Center, Mansfield, San Augustine, Stonewall, Logansport, Tenaha,
Joaquin, Melrose, Patroon, Martinsville, Bland Lake, Neuville,
Shelbyville, Chireno, Huxley, South Mansfield, Keachi, Grand Cane,
Longstreet and Stanley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3154 9457 3169 9438 3189 9424 3206 9419
      3227 9426 3230 9374 3201 9364 3185 9369
      3165 9383 3160 9389 3157 9398 3152 9398
      3144 9408
TIME...MOT...LOC 1713Z 275DEG 21KT 3220 9420 3206 9414 3189 9420 3169
9433 3159 9446

13

Special weather statement, May 17, 1:02 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 8:47 PM CDT	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	20 days
May 16, 8:48 PM CDT	River Flood Warning	SHV	Wood	7 days
May 16, 8:50 PM CDT	River Flood Warning	SHV	Franklin, Morris, Titus	21 days
May 17, 4:34 AM CDT	Areal Flood Advisory	SHV	Sabine, San Augustine	4 hr
May 17, 8:49 AM CDT	River Flood Warning	SHV	Gregg	6 days
May 17, 8:54 AM CDT	River Flood Warning	SHV	Cass, Marion	13 days
May 17, 8:56 AM CDT	River Flood Warning	SHV	Gregg, Harrison, Marion, Upshur	10 days
May 17, 11:13 AM CDT	Areal Flood Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine, Shelby	6 hr
May 17, 12:13 PM CDT	Special Weather Statement	SHV	Shelby	47 min
May 17, 1:56 PM CDT	Flash Flood Watch	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	5 days
May 17, 2:10 PM CDT	River Flood Warning	SHV	Panola, Shelby	5 days
May 17, 9:06 AM CDT	River Flood Warning	SHV	Bienville, Bossier, Red River, Webster	29 hr
May 17, 1:59 PM CDT	Special Weather Statement	SHV	Bienville, Natchitoches, Winn	61 min
May 17, 2:55 PM CDT	Special Weather Statement	SHV	Grant, Winn	65 min

Nearby

Special Weather Statements in Louisiana, 2021 Special Weather Statements in Texas, 2021 Every 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.