Alert archive / Louisiana / Special Weather Statements in 2021
Special Weather Statement, NWS Shreveport, LA
NWS Shreveport, LA issued this special weather statement at Jul 12, 2021, 6:15 AM CDT for LaSalle Parish, Louisiana. It was in force for 30 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
- Jul 12, 2021, 6:15 AM CDT (11:15 UTC)
- Expired
- Jul 12, 2021, 6:45 AM CDT
- In force
- 30 min
- Issued by
- NWS Shreveport, LA
County LaSalle Parish, LA
The radar
The Ft Polk radar (KPOE), 86 km from the middle of the area, began a volume at 11:18 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
Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.3 hours before the alert went out and 177 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
- 2736 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 874 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 12, 4:30 AM CDT, 1 hour 45 minutes earlier.
Area forecast discussion, Jul 12, 4:30 AM CDT, 1 hour 45 minutes before
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<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
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<p id="message2">
Please try again in a few minutes.
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If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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</html>Hazardous weather outlook, Jul 12, 6:06 AM CDT, 9 minutes before
Hazardous Weather Outlook National Weather Service Shreveport LA 606 AM CDT Mon Jul 12 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>167-131115- 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 Mon Jul 12 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... Isolated to widely scattered showers and thunderstorms will remain possible across much of the region today into this evening as an upper level trough and stalled frontal boundary continue to linger. Although no organized severe threat exists, any storms that manage to develop may produce some gusty winds and brief heavy downpours. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... Diurnally driven showers and thunderstorms will remain possible each day through the remainder of this week and into the weekend. Stronger storms may be capable of producing gusty winds and brief heavy downpours, generally more of a concern during the hours of afternoon peak heating. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel, amateur radio operators and storm spotters should not be needed through tonight. 19
In the hours before
Special weather statement, Jul 12, 6:15 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Shreveport LA
615 AM CDT Mon Jul 12 2021
LAZ020-022-121145-
La Salle LA-Grant LA-
615 AM CDT Mon Jul 12 2021
...SPECIAL WEATHER STATEMENT...
At 614 AM CDT, Doppler radar was tracking a strong thunderstorm 8
miles west of Walters, or 16 miles northwest of Larto, moving
northeast at 55 mph.
Winds in excess of 30 mph will be possible with this storm.
Locations impacted include...
Nebo, Rogers and Catahoula Lake.
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.
If on or near Catahoula Lake, get out of the water and move indoors
or inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 3134 9204 3132 9208 3134 9209 3135 9207
3136 9208 3138 9212 3141 9215 3143 9216
3145 9216 3146 9217 3147 9216 3148 9221
3146 9232 3156 9230 3166 9201 3133 9201
TIME...MOT...LOC 1114Z 245DEG 46KT 3152 9213
24The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 7:23 PM CDT | Special Weather Statement | SHV | Rusk | 52 min |
| Jul 11, 8:25 PM CDT | Areal Flood Advisory | SHV | Rusk | 110 min |
| Jul 11, 8:31 PM CDT | Special Weather Statement | SHV | Rusk | 44 min |
| Jul 11, 8:40 PM CDT | Special Weather Statement | SHV | Cherokee | 50 min |
| Jul 11, 9:10 PM CDT | Flash Flood Warning | SHV | Cherokee, Panola, Rusk, Shelby, Smith | 3 hr |
| Jul 11, 9:49 PM CDT | Special Weather Statement | SHV | Cherokee | 41 min |
| Jul 11, 10:27 PM CDT | Special Weather Statement | SHV | Nacogdoches | 48 min |
| Jul 11, 10:50 PM CDT | Special Weather Statement | SHV | Smith | 40 min |
| Jul 11, 11:12 PM CDT | Special Weather Statement | SHV | Smith | 48 min |
| Jul 11, 11:15 PM CDT | Special Weather Statement | SHV | Gregg | 45 min |
| Jul 12, 12:13 AM CDT | Flash Flood Warning | SHV | Cherokee, Rusk, Smith | 4 hr |
| Jul 12, 2:10 AM CDT | Areal Flood Advisory | SHV | Cherokee, Nacogdoches | 3 hr |
| Jul 12, 6:28 AM CDT | River Flood Warning | SHV | Anderson, Cherokee, Houston, Trinity | 21 days |
| Jul 12, 6:28 AM CDT | River Flood Warning | SHV | Nacogdoches, Rusk | 25 hr |
| Jul 12, 8:20 AM CDT | River Flood Warning | SHV | Angelina, Houston, Polk, Trinity, Tyler | 11 days |
| Jul 12, 1:56 PM CDT | Special Weather Statement | SHV | Wood | 49 min |
| Jul 12, 2:37 PM CDT | Severe Thunderstorm Warning | SHV | Wood | 43 min |
| Jul 11, 7:12 PM CDT | Special Weather Statement | SHV | Red River | 48 min |
| Jul 11, 8:03 PM CDT | Special Weather Statement | SHV | Webster | 42 min |
| Jul 11, 8:53 PM CDT | Special Weather Statement | SHV | Caddo | 52 min |
| Jul 12, 2:28 PM CDT | Special Weather Statement | SHV | Lafayette | 47 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.