Alert archive / Louisiana / Hurricane Watches in 2021
Hurricane Watch 1009, NWS New Orleans, LA
NWS New Orleans, LA issued this hurricane watch at Aug 26, 2021, 10:09 PM CDT for 15 parishes in Louisiana; 5 counties in Mississippi. It was in force for 36 hr.
The area
The counties it named.
The facts
- Issued
- Aug 26, 2021, 10:09 PM CDT (03:09 UTC)
- Expired
- Aug 28, 2021, 10:20 AM CDT
- In force
- 36 hr
- Issued by
- NWS New Orleans, LA
Counties Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 3.2 hours before the alert went out and 100 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
- 2172 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 864 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this hurricane watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS New Orleans, LA wrote its last area forecast discussion before this hurricane watch went out at Aug 26, 6:43 PM CDT, 3 hours 26 minutes earlier.
Area forecast discussion, Aug 26, 6:43 PM CDT, 3 hours 26 minutes before
<!doctype html>
<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">
<section class="card" role="status" aria-live="polite">
<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.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Special weather statement, Aug 26, 4:47 PM CDT, 5 hours 22 minutes before
Special Weather Statement
National Weather Service New Orleans LA
447 PM CDT Thu Aug 26 2021
LAZ057>060-065>067-262315-
Lower Terrebonne LA-St. Charles LA-Upper Terrebonne LA-
Lower Lafourche LA-St. John The Baptist LA-St. James LA-
Upper Lafourche LA-
447 PM CDT Thu Aug 26 2021
...Strong thunderstorms will impact portions of southwestern St. John
The Baptist, southeastern St. James, southwestern St. Charles,
eastern Terrebonne and Lafourche Parishes through 615 PM CDT...
At 447 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles northeast of Lockport to Golden Meadow
to 8 miles southwest of Port Fourchon. Movement was northwest at 20
mph.
HAZARD...Winds in excess of 30 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Houma, Cut Off, Galliano, Larose, Lockport, Golden Meadow, Mathews,
Paradis, Des Allemands, South Vacherie, Chauvin, Dulac, Raceland,
Bayou Gauche, Montegut, Leeville, Cocodrie, Chackbay, Tambour Bay
Buoy and Lumcon Center Buoy.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 2928 9035 2934 9035 2922 9040 2930 9040
2935 9043 2927 9048 2928 9058 2922 9056
2922 9053 2921 9054 2922 9064 2913 9065
2918 9075 2972 9069 2996 9071 2996 9052
2968 9024 2934 9018 2909 9023
TIME...MOT...LOC 2147Z 143DEG 19KT 2969 9041 2940 9030 2905 9031
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH
CABThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 10:09 PM CDT | Storm Surge Watch | LIX | Assumption, Orleans, Saint Bernard, Saint James, Saint John the Baptist, Saint Tammany | 18 hr |
| Aug 27, 3:34 AM CDT | Special Marine Warning | LIX | 116 min | |
| Aug 27, 5:27 AM CDT | Special Marine Warning | LIX | 48 min | |
| Aug 27, 6:19 AM CDT | Special Marine Warning | LIX | 56 min | |
| Aug 27, 7:12 AM CDT | Special Marine Warning | LIX | 63 min | |
| Aug 27, 8:34 AM CDT | Special Marine Warning | LIX | 56 min | |
| Aug 27, 10:10 AM CDT | Areal Flood Advisory | LIX | Orleans, Saint Tammany | 3 hr |
| Aug 27, 10:17 AM CDT | Flash Flood Watch | LIX | Orleans, Saint Bernard, Saint James, Saint John the Baptist, Saint Tammany | 12 hr |
| Aug 27, 12:21 PM CDT | Special Marine Warning | LIX | 54 min | |
| Aug 27, 4:01 PM CDT | Hurricane Warning | LIX | Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more | 60 hr |
| Aug 27, 4:01 PM CDT | Tropical Storm Warning | LIX | Assumption, East Baton Rouge, East Feliciana, Orleans, Saint Bernard, Saint Helena and 5 more | 24 days |
| Aug 27, 4:12 PM CDT | Storm Surge Warning | LIX | Assumption, Iberville, Orleans, Saint Bernard, Saint James, Saint John the Baptist and 1 more | 3 days |
| Aug 27, 9:37 AM CDT | River Flood Warning | LIX | Harrison | 6 days |
| Aug 27, 9:37 AM CDT | River Flood Warning | LIX | Hancock | 5 days |
| Aug 27, 9:37 AM CDT | River Flood Warning | LIX | Harrison | 5 days |
| Aug 27, 9:37 AM CDT | River Flood Warning | LIX | Harrison | 6 days |
| Aug 27, 10:46 AM CDT | Tropical Storm Watch | LIX | Amite, Pearl River, Pike, Walthall, Wilkinson | 5 hr |
| Aug 27, 1:28 PM CDT | Areal Flood Advisory | LIX | Harrison, Jackson | 3 hr |
| Aug 27, 1:44 PM CDT | Flash Flood Warning | LIX | Harrison | 3 hr |
Nearby
Hurricane Watches in Louisiana, 2021Hurricane Watches in Mississippi, 2021Every hurricane watch 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.