Alert archive / Texas / Special Weather Statements in 2021
Special Weather Statement, NWS Shreveport, LA
NWS Shreveport, LA issued this special weather statement at May 4, 2021, 10:40 AM CDT for Nacogdoches County, San Augustine County, Shelby County, Texas. 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
- May 4, 2021, 10:40 AM CDT (15:40 UTC)
- Expired
- May 4, 2021, 11:30 AM CDT
- In force
- 50 min
- Issued by
- NWS Shreveport, LA
Counties Nacogdoches County, TX, San Augustine County, TX, Shelby County, TX
The radar
The Shreveport radar (KSHV), 97 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 104 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.
- 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
The text
As transmitted.
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</html>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, 3 minutes earlier.
Area forecast discussion, May 4, 10:37 AM CDT, 3 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 52 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, 6:36 AM CDT, 4 hours 4 minutes before
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</html>Local storm report, May 4, 9:12 AM CDT, 1 hour 28 minutes before
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</html>Local storm report, May 4, 9:34 AM CDT, 1 hour 6 minutes before
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</html>Special weather statement, May 4, 10:15 AM CDT, 25 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
05Special weather statement, May 4, 10:15 AM CDT, 25 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, 0 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
05The 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, 11:07 AM CDT | Severe Thunderstorm Warning | SHV | Panola, Shelby | 38 min |
| May 4, 10:44 AM CDT | Special Weather Statement | SHV | Bossier, Caddo | 46 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 Texas, 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.