Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

May 4, 2021Bossier Parish, Caddo Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at May 4, 2021, 10:44 AM CDT for Bossier Parish, Caddo Parish, Louisiana. It was in force for 46 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 4, 2021, 10:44 AM CDT (15:44 UTC)
Expired: May 4, 2021, 11:30 AM CDT
In force: 46 min
Issued by: NWS Shreveport, LA

Counties Bossier Parish, LA, Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 56 km from the middle of the area, began a volume at 15:44 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, 3.7 hours before the alert went out and 49 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: 2618 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 208 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.0

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 4, 10:37 AM CDT, 7 minutes earlier.

Area forecast discussion, May 4, 10:37 AM CDT, 7 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
1037 AM CDT Tue May 4 2021

.UPDATE...

Any plans made today should account for impacts from severe
thunderstorms, including large hail and damaging winds. As of
10:30 AM, the frontal boundary is clearly evident on radar, having
crossed Marshall, TX in a line from Mount Enterprise, TX
northwestward to Magnolia, AR. Convection is ongoing, with the
most robust cluster of storms west of Lufkin, TX. Surface moisture
ahead of the front continues to be plentiful with dew points
exceeding the 70-degree mark. High-resolution guidance indicates
storm initiations to continue along the front through the rest of
the afternoon as it shifts eastward, with severe thunderstorms
likely to occur in Deep East Texas and North-central Louisiana.

Temperatures have been adjusted, especially ahead of the frontal
boundary, to account for compressional heating. Winds and
precipitation chances have all been updated to account for frontal
position and current activity. Otherwise, all necessary
forecast adjustments have been made.

Severe Thunderstorm Watch #142 remains in effect for Deep East
Texas until 1PM CDT, with a downstream watch likely this afternoon
for parts of northeast Louisiana and eastward. /16/

&&

PREV DISCUSSION... /issued 655 AM CDT Tue May 4 2021/

AVIATION...

A mix bag of ceilings expected through the TAF period as cold
front moves across the area. Over the next several hours, showers
and thunderstorms will start to develop near a frontal boundary as
it slowly moves across the region. Ceilings may drop into IFR
category along with reduced visibility during heaviest rain
activity. Winds could also gusts up to 50kts with large as well.
Expect gradual clearing behind the front and thunderstorms, with
northwest winds and VFR conditions. /20/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  82  56  78  56 /  60   0   0   0
MLU  83  57  76  55 /  80  10   0   0
DEQ  74  48  76  51 /  20   0   0   0
TXK  77  53  75  55 /  40   0   0   0
ELD  82  52  76  51 /  60   0   0   0
TYR  77  53  77  56 /  30   0   0   0
GGG  78  53  77  54 /  50   0   0   0
LFK  80  56  79  56 /  80   0   0   0

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...None.
LA...None.
OK...None.
TX...None.
&&

16/20

Hazardous weather outlook, May 4, 4:48 AM CDT, 5 hours 56 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
448 AM CDT Tue May 4 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>167-051000-
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-
448 AM CDT Tue May 4 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...Today and Tonight...

Showers and thunderstorms will redevelop along a boundary
situated from deep east Texas to southwest Arkansas and progress
southeast through the day Tuesday. Storm activity is expected to
remain south of the I-30 corridor. The primary threats associated
with these storms are expected to be damaging winds, large hail,
and locally heavy rainfall. An isolated tornado or two cannot be
ruled out.

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

No hazardous weather is expected through the remainder of the work
week, until thunderstorms chances return this weekend.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters may be needed for today. Please
relay any information about observed severe weather to the NWS
while following all local, state, and CDC guidelines.

In the hours before

Local storm report, May 4, 9:12 AM CDT, 1 hour 32 minutes before

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Local storm report, May 4, 9:34 AM CDT, 1 hour 10 minutes before

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Special weather statement, May 4, 10:15 AM CDT, 29 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1015 AM CDT Tue May 4 2021

TXZ149-152-165-166-041600-
Cherokee TX-Angelina TX-Nacogdoches TX-San Augustine TX-
1015 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL NACOGDOCHES...ANGELINA...
WEST CENTRAL SAN AUGUSTINE AND SOUTHEASTERN CHEROKEE COUNTIES UNTIL
1100 AM CDT...

At 1014 AM CDT, Doppler radar was tracking a strong thunderstorm near
Apple Springs, moving northeast at 55 mph.

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

Locations impacted include...
Lufkin, Nacogdoches, Diboll, Hudson, Huntington, Wells, Melrose,
Woden, Pollok, Etoile, Forest, Burke, Appleby, Broaddus, Shawnee,
Clawson, Central, Redland and Homer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

&&

A Severe Thunderstorm Watch remains in effect until 100 PM CDT for
eastern Texas.

LAT...LON 3110 9474 3115 9485 3123 9486 3126 9490
      3128 9488 3130 9490 3132 9490 3134 9496
      3138 9495 3142 9500 3144 9501 3145 9505
      3147 9506 3147 9510 3149 9511 3150 9509
      3152 9510 3178 9458 3128 9420 3109 9465
TIME...MOT...LOC 1514Z 240DEG 49KT 3124 9502

05

Special weather statement, May 4, 10:15 AM CDT, 29 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1015 AM CDT Tue May 4 2021

LAZ001-TXZ138-151-041545-
Caddo LA-Panola TX-Harrison TX-
1015 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CADDO PARISH...
SOUTHEASTERN HARRISON AND NORTHEASTERN PANOLA COUNTIES UNTIL 1045 AM
CDT...

At 1015 AM CDT, Doppler radar was tracking a strong thunderstorm 8
miles west of Elysian Fields, or 13 miles south of Marshall, moving
northeast at 55 mph.

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

Locations impacted include...
Shreveport, Greenwood, Waskom, Deberry, Elysian Fields, Jonesville
and Bethany.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3222 9434 3238 9445 3267 9397 3239 9382
TIME...MOT...LOC 1515Z 239DEG 49KT 3235 9432

13

Special weather statement, May 4, 10:40 AM CDT, 4 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1040 AM CDT Tue May 4 2021

TXZ152-153-165>167-041630-
Sabine TX-Angelina TX-Nacogdoches TX-San Augustine TX-Shelby TX-
1040 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN NACOGDOCHES...SHELBY...
CENTRAL ANGELINA...NORTHERN SAN AUGUSTINE AND NORTHWESTERN SABINE
COUNTIES UNTIL 1130 AM CDT...

At 1040 AM CDT, Doppler radar was tracking a strong thunderstorm near
Woden, or 7 miles southeast of Nacogdoches, moving northeast at 55
mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Nacogdoches, Center, San Augustine, Tenaha, Garrison, Melrose,
Patroon, Martinsville, Bland Lake, Neuville, Woden, Macune, Etoile,
Shelbyville, Appleby, Chireno, Jericho, Stockman, Chinaquapin and
Hurstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

&&

A Severe Thunderstorm Watch remains in effect until 100 PM CDT for
eastern Texas.

LAT...LON 3126 9442 3169 9472 3185 9446 3184 9446
      3185 9445 3198 9424 3198 9414 3153 9380
TIME...MOT...LOC 1540Z 236DEG 46KT 3154 9455

05

Special weather statement, May 4, 10:44 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1044 AM CDT Tue May 4 2021

ARZ072-LAZ001>003-041630-
Columbia AR-Bossier LA-Caddo LA-Webster LA-
1044 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN COLUMBIA COUNTY...
NORTHWESTERN WEBSTER...SOUTHWESTERN CADDO AND BOSSIER PARISHES UNTIL
1130 AM CDT...

At 1044 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Plain Dealing to near Greenwood. Movement
was northeast at 45 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
these storms.

Locations impacted include...
Shreveport, Bossier City, Springhill, Greenwood, Blanchard, Benton,
Cullen, Plain Dealing, Cotton Valley, Sarepta, Emerson, Belcher,
Shongaloo, Eastwood, Fosters, Welcome, Alden Bridge, Ferguson, Cross
Lake and Bodcau.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3302 9322 3302 9324 3299 9324 3238 9367
      3237 9404 3247 9404 3302 9362 3302 9349
      3305 9349 3314 9313
TIME...MOT...LOC 1544Z 240DEG 41KT 3294 9364 3246 9402

05

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 10:55 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Franklin, Red River, Smith, Titus, Upshur and 1 more	65 min
May 3, 11:44 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Marion, Morris, Red River and 2 more	61 min
May 4, 12:34 AM CDT	Severe Thunderstorm Warning	SHV	Bowie	41 min
May 4, 1:10 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Smith, Upshur, Wood	50 min
May 4, 4:54 AM CDT	Special Weather Statement	SHV	Gregg, Harrison	51 min
May 4, 5:13 AM CDT	Special Weather Statement	SHV	Rusk	32 min
May 4, 10:15 AM CDT	Special Weather Statement	SHV	Angelina, Nacogdoches	45 min
May 4, 10:15 AM CDT	Special Weather Statement	SHV	Harrison	30 min
May 4, 10:40 AM CDT	Special Weather Statement	SHV	Nacogdoches, San Augustine, Shelby	50 min
May 4, 11:07 AM CDT	Severe Thunderstorm Warning	SHV	Panola, Shelby	38 min
May 4, 10:54 AM CDT	Special Weather Statement	SHV	Caddo	66 min
May 4, 11:10 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, De Soto, Webster	50 min
May 4, 11:14 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto	31 min
May 4, 11:24 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Jackson, Lincoln	51 min
May 4, 11:45 AM CDT	Special Weather Statement	SHV	Natchitoches	45 min
May 4, 11:48 AM CDT	Special Weather Statement	SHV	Ouachita	42 min
May 4, 12:05 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, De Soto, Natchitoches, Red River, Sabine	40 min
May 4, 12:17 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	43 min
May 4, 12:25 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln, Ouachita, Union	65 min
May 4, 12:28 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita, Union, Winn	47 min
May 4, 12:41 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Natchitoches, Winn	64 min
May 4, 12:48 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Winn	57 min
May 4, 12:53 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, LaSalle	52 min
May 3, 11:59 PM CDT	Special Weather Statement	SHV	Sevier	61 min
May 4, 12:25 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	34 min
May 4, 1:19 AM CDT	Special Weather Statement	SHV	Hempstead, Nevada	41 min
May 3, 9:27 PM CDT	Special Weather Statement	SHV	McCurtain	48 min
May 3, 10:09 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	36 min

Nearby

Special Weather Statements in Louisiana, 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.