Alert archive / Louisiana / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 126, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Aug 19, 2017, 3:46 PM CDT for Livingston Parish, Tangipahoa Parish, Louisiana. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2017, 3:46 PM CDT (20:46 UTC)
- Expired
- Aug 19, 2017, 4:15 PM CDT
- In force
- 29 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Livingston Parish, LA, Tangipahoa Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.8 hours before the alert went out and 89 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
- 1945 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 978 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 19, 12:13 PM CDT, 3 hours 33 minutes earlier.
Area forecast discussion, Aug 19, 12:13 PM CDT, 3 hours 33 minutes before
Area Forecast Discussion National Weather Service New Orleans LA 1213 PM CDT Sat Aug 19 2017 .AVIATION... VFR conditions will prevail at all of the terminals through the forecast period. The biggest concern will be thunderstorms developing between 18z and 00z today that could impact any of the terminals for brief periods of time. Have included VCTS wording to reflect this risk at most of the terminals. However, at KHUM, have included a couple of hours of MVFR visbilities and prevailing thunder in a tempo group as rainfall probabilities currently are highest at this terminal for this afternoon. The biggest concern with any convection will be strong gusty winds and wind shear near the thunderstorms as well as periods of IFR visibility restrictions as the storms move through. 32 && .PRELIMINARY POINT TEMPS/POPS... MCB 74 92 74 91 / 20 30 20 30 BTR 74 93 76 92 / 10 30 20 40 ASD 75 93 76 90 / 10 30 20 40 MSY 77 93 78 90 / 10 30 20 50 GPT 76 92 78 89 / 10 30 20 40 PQL 74 93 77 90 / 10 30 20 40 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. &&
Hazardous weather outlook, Aug 19, 11:03 AM CDT, 4 hours 43 minutes before
Hazardous Weather Outlook National Weather Service New Orleans LA 1103 AM CDT Sat Aug 19 2017 GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037- 039-040-046>050-056>072-MSZ068>071-077-080>082-200415- Lake Pontchartrain and Lake Maurepas-Mississippi Sound- Lake Borgne-Chandeleur Sound-Breton Sound- Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm- Coastal waters from the Southwest Pass of the Mississippi River to Port Fourchon Louisiana out 20 NM- Coastal Waters from Boothville LA to Southwest Pass of the Mississippi River out 20 nm- Coastal waters from Pascagoula Mississippi to Stake Island out 20 NM- Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River LA from 20 to 60 NM- Coastal waters from Southwest Pass of the Mississippi River to Port Fourchon Louisiana from 20 to 60 NM- Coastal Waters from Stake Island LA to Southwest Pass of the Mississippi River from 20 to 60 nm- Coastal waters from Pascagoula Mississippi to Stake Island Louisiana out 20 to 60 NM-Pointe Coupee-West Feliciana- East Feliciana-St. Helena-Washington-St. Tammany-Iberville- West Baton Rouge-East Baton Rouge-Ascension-Livingston-Assumption- St. James-St. John The Baptist-Upper Lafourche-St. Charles- Upper Jefferson-Orleans-Upper Plaquemines-Upper St. Bernard- Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson- Lower Plaquemines-Lower St. Bernard-Northern Tangipahoa- Southern Tangipahoa-Wilkinson-Amite-Pike-Walthall-Pearl River- Hancock-Harrison-Jackson- 1103 AM CDT Sat Aug 19 2017 This Hazardous Weather Outlook is for portions of Southeast Louisiana...South Mississippi and the adjacent coastal waters. .DAY ONE...This Afternoon and Tonight Afternoon showers and thunderstorms are expected. A few could be strong to possibly severe with damaging downburst winds. Frequent lightning and heavy downpours with localized flooding are a potential as well. .DAYS TWO THROUGH SEVEN...Sunday through Friday Daily afternoon thunderstorms are expected through next week. A few of the storms each day could become strong, producing gusty winds, frequent lightning and heavy downpours that could result in localized street flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. 32
In the hours before
Special weather statement, Aug 19, 3:19 PM CDT, 27 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>Special weather statement, Aug 19, 3:30 PM CDT, 16 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>Special weather statement, Aug 19, 3:32 PM CDT, 14 minutes before
Special Weather Statement National Weather Service New Orleans LA 332 PM CDT SAT AUG 19 2017 LAZ040-072-192100- Southern Tangipahoa-St. Tammany- 332 PM CDT SAT AUG 19 2017 ...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ST. TAMMANY AND SOUTHERN TANGIPAHOA PARISHES... At 331 PM CDT, a strong thunderstorm was located near Robert, or 9 miles west of Covington, moving southwest at 15 mph. Winds in excess of 30 mph are possible with this storm. Locations impacted include... Hammond, Ponchatoula and Robert. Torrential rainfall is also occurring with this storm, and may cause 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. LAT...LON 3059 9025 3048 9016 3031 9038 3049 9052 TIME...MOT...LOC 2031Z 057DEG 14KT 3051 9026 32
Special weather statement, Aug 19, 3:38 PM CDT, 8 minutes before
Special Weather Statement National Weather Service New Orleans LA 338 PM CDT SAT AUG 19 2017 MSZ082-192130- Jackson- 338 PM CDT SAT AUG 19 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN JACKSON COUNTY... At 338 PM CDT, a strong thunderstorm was located 8 miles northwest of Wade, or 13 miles south of Lucedale, moving south at 10 mph. Winds in excess of 40 mph are possible with this storm. Locations impacted include... Escatawpa, Vancleave, Wade and Hurley. Torrential rainfall is also occurring with this storm, and may cause 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. LAT...LON 3051 8851 3054 8882 3073 8876 3073 8853 TIME...MOT...LOC 2038Z 006DEG 9KT 3074 8864 32
Special weather statement, Aug 19, 3:42 PM CDT, 4 minutes before
Special Weather Statement
National Weather Service New Orleans LA
342 PM CDT SAT AUG 19 2017
LAZ040-MSZ077-080-192115-
St. Tammany-Hancock-Pearl River-
342 PM CDT SAT AUG 19 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN ST.
TAMMANY PARISH...SOUTHERN HANCOCK AND SOUTH CENTRAL PEARL RIVER
COUNTIES...
At 342 PM CDT, radar indicated strong thunderstorms were located
along a line extending from near Picayune to near Shoreline Park.
Movement was south at 30 mph.
Winds in excess of 40 mph are possible with these storms.
Locations impacted include...
Slidell, Picayune, Waveland, Diamondhead, Pearl River, Pearlington,
Shoreline Park, Stennis Space Center, Lacombe, Kiln and Slidell
Airport.
Torrential rainfall is also occurring with these storms, and may
cause 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.
LAT...LON 3056 8973 3036 8937 3018 8946 3018 8947
3019 8946 3019 8948 3018 8970 3017 8971
3018 8972 3021 8980 3023 8985 3025 8987
3026 8990 3025 8992 3026 8995
TIME...MOT...LOC 2042Z 017DEG 26KT 3048 8971 3035 8944
32Special weather statement, Aug 19, 3:44 PM CDT, 2 minutes before
Special Weather Statement
National Weather Service New Orleans LA
344 PM CDT SAT AUG 19 2017
MSZ068>070-192130-
Pike-Wilkinson-Amite-
344 PM CDT SAT AUG 19 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN PIKE...
WILKINSON AND AMITE COUNTIES...
At 344 PM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles south of Jonesville to Slocum to
6 miles west of Gloster to 7 miles southwest of Mccomb. Movement was
southeast at 15 mph.
Winds in excess of 30 mph are possible with these storms.
Locations impacted include...
Liberty, Magnolia, Centreville, Woodville, Gloster, Osyka, Gillsberg
and Mccomb Airport.
Torrential rainfall is also occurring with these storms, and may
cause 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.
LAT...LON 3124 9116 3126 9053 3100 9026 3100 9117
3106 9152 3116 9160 3124 9156 3122 9153
3123 9149 3126 9148 3128 9150 3130 9147
TIME...MOT...LOC 2044Z 329DEG 14KT 3154 9186 3128 9167 3118 9112 3120
9057
32The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 8:31 AM CDT | Special Marine Warning | LIX | 29 min | |
| Aug 19, 8:43 AM CDT | Special Marine Warning | LIX | 62 min | |
| Aug 19, 9:39 AM CDT | Special Marine Warning | LIX | 66 min | |
| Aug 19, 9:41 AM CDT | Special Marine Warning | LIX | 64 min | |
| Aug 19, 10:43 AM CDT | Special Marine Warning | LIX | 32 min | |
| Aug 19, 12:28 PM CDT | Special Marine Warning | LIX | 47 min | |
| Aug 19, 12:30 PM CDT | Special Marine Warning | LIX | 45 min | |
| Aug 19, 12:37 PM CDT | Special Marine Warning | LIX | 38 min | |
| Aug 19, 1:02 PM CDT | Special Weather Statement | LIX | Washington | 28 min |
| Aug 19, 1:07 PM CDT | Special Marine Warning | LIX | 38 min | |
| Aug 19, 1:08 PM CDT | Special Marine Warning | LIX | 52 min | |
| Aug 19, 1:10 PM CDT | Special Marine Warning | LIX | 50 min | |
| Aug 19, 1:16 PM CDT | Special Weather Statement | LIX | Jefferson | 29 min |
| Aug 19, 1:33 PM CDT | Special Marine Warning | LIX | 42 min | |
| Aug 19, 1:53 PM CDT | Special Marine Warning | LIX | 52 min | |
| Aug 19, 1:55 PM CDT | Special Marine Warning | LIX | 50 min | |
| Aug 19, 1:56 PM CDT | Special Marine Warning | LIX | 49 min | |
| Aug 19, 2:06 PM CDT | Special Weather Statement | LIX | Washington | 39 min |
| Aug 19, 2:28 PM CDT | Special Marine Warning | LIX | 47 min | |
| Aug 19, 2:42 PM CDT | Special Marine Warning | LIX | 48 min | |
| Aug 19, 2:45 PM CDT | Special Weather Statement | LIX | Saint Tammany | 45 min |
| Aug 19, 2:48 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 27 min |
| Aug 19, 2:57 PM CDT | Special Weather Statement | LIX | Lafourche | 33 min |
| Aug 19, 2:59 PM CDT | Special Weather Statement | LIX | Jefferson | 31 min |
| Aug 19, 3:16 PM CDT | Special Marine Warning | LIX | 44 min | |
| Aug 19, 3:17 PM CDT | Special Marine Warning | LIX | 43 min | |
| Aug 19, 3:19 PM CDT | Special Marine Warning | LIX | 26 min | |
| Aug 19, 3:19 PM CDT | Special Weather Statement | LIX | Saint John the Baptist | 26 min |
| Aug 19, 3:30 PM CDT | Special Weather Statement | LIX | Terrebonne | 45 min |
| Aug 19, 3:32 PM CDT | Special Weather Statement | LIX | Tangipahoa | 28 min |
| Aug 19, 3:33 PM CDT | Severe Thunderstorm Warning | LIX | Saint Helena, Tangipahoa | 27 min |
| Aug 19, 3:48 PM CDT | Special Marine Warning | LIX | 42 min | |
| Aug 19, 3:51 PM CDT | Special Marine Warning | LIX | 24 min | |
| Aug 19, 4:02 PM CDT | Special Weather Statement | LIX | Saint Helena | 28 min |
| Aug 19, 4:05 PM CDT | Special Weather Statement | LIX | Terrebonne | 55 min |
| Aug 19, 4:07 PM CDT | Special Marine Warning | LIX | 53 min | |
| Aug 19, 4:23 PM CDT | Special Marine Warning | LIX | 67 min | |
| Aug 19, 4:26 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche, Saint Charles | 34 min |
| Aug 19, 4:49 PM CDT | Special Weather Statement | LIX | Saint Charles | 26 min |
| Aug 19, 4:52 PM CDT | Special Weather Statement | LIX | Ascension, Saint James | 53 min |
| Aug 19, 5:04 PM CDT | Special Marine Warning | LIX | 56 min | |
| Aug 19, 5:08 PM CDT | Special Weather Statement | LIX | East Feliciana | 52 min |
| Aug 19, 5:15 PM CDT | Special Weather Statement | LIX | Lafourche | 30 min |
| Aug 19, 5:24 PM CDT | Special Weather Statement | LIX | Assumption, Iberville | 51 min |
| Aug 19, 5:27 PM CDT | Special Weather Statement | LIX | Saint James | 33 min |
| Aug 19, 5:52 PM CDT | Severe Thunderstorm Warning | LIX | Assumption | 23 min |
| Aug 19, 5:54 PM CDT | Severe Thunderstorm Warning | LIX | Assumption, Lafourche, Terrebonne | 36 min |
| Aug 19, 6:20 PM CDT | Special Weather Statement | LIX | Jefferson, Lafourche | 40 min |
| Aug 19, 12:38 PM CDT | Special Weather Statement | LIX | Jackson | 37 min |
| Aug 19, 12:40 PM CDT | Special Weather Statement | LIX | Jackson | 50 min |
| Aug 19, 1:00 PM CDT | Special Weather Statement | LIX | Jackson | 30 min |
| Aug 19, 1:15 PM CDT | Special Weather Statement | LIX | Harrison | 30 min |
| Aug 19, 2:08 PM CDT | Special Weather Statement | LIX | Jackson | 52 min |
| Aug 19, 2:26 PM CDT | Special Weather Statement | LIX | Pearl River | 49 min |
| Aug 19, 2:30 PM CDT | Special Weather Statement | LIX | Hancock | 45 min |
| Aug 19, 2:38 PM CDT | Severe Thunderstorm Warning | LIX | Hancock, Pearl River | 37 min |
| Aug 19, 2:40 PM CDT | Severe Thunderstorm Warning | LIX | Hancock | 35 min |
| Aug 19, 2:56 PM CDT | Special Weather Statement | LIX | Stone | 34 min |
| Aug 19, 3:01 PM CDT | Special Weather Statement | LIX | Pike | 44 min |
| Aug 19, 3:08 PM CDT | Special Weather Statement | LIX | Hancock | 37 min |
| Aug 19, 3:12 PM CDT | Special Weather Statement | LIX | Hancock | 33 min |
| Aug 19, 3:38 PM CDT | Special Weather Statement | LIX | Jackson | 52 min |
| Aug 19, 3:42 PM CDT | Special Weather Statement | LIX | Hancock | 33 min |
| Aug 19, 3:44 PM CDT | Special Weather Statement | LIX | Amite, Wilkinson | 46 min |
| Aug 19, 3:55 PM CDT | Severe Thunderstorm Warning | LIX | Amite, Pike | 35 min |
| Aug 19, 4:28 PM CDT | Special Weather Statement | LIX | Amite, Wilkinson | 47 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2017Every severe thunderstorm warning in 2017
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.