Alert archive / Louisiana / Special Weather Statements in 2018
Special Weather Statement, NWS New Orleans, LA
NWS New Orleans, LA issued this special weather statement at Sep 3, 2018, 4:13 PM CDT for Saint Charles Parish, Louisiana. It was in force for 47 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
- Sep 3, 2018, 4:13 PM CDT (21:13 UTC)
- Expired
- Sep 3, 2018, 5:00 PM CDT
- In force
- 47 min
- Issued by
- NWS New Orleans, LA
County Saint Charles Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 9.2 hours before the alert went out and 93 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
- 1676 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 602 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 82 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 New Orleans, LA wrote its last area forecast discussion before this special weather statement went out at Sep 3, 12:48 PM CDT, 3 hours 25 minutes earlier.
Area forecast discussion, Sep 3, 12:48 PM CDT, 3 hours 25 minutes before
Area Forecast Discussion
National Weather Service New Orleans LA
1248 PM CDT Mon Sep 3 2018
...AVIATION SECTION UPDATED...
PREV DISCUSSION... /issued 439 AM CDT Mon Sep 3 2018/
SHORT TERM...
Large TUTT low circulation well defined in satellite imagery over
SW Louisiana this morning to aid in synoptic scale lift on robust
onshore flow. This will garner 60-70% chance today and Tuesday.
Meanwhile, broad circulation associated with Potential Tropical
Cyclone SEVEN appears to be moving a bit faster towards south
Florida. As a result, tropical storm watches will be elevated to
warnings with this package, due to expected arrival of impacts
upon the CWA closer to 36 hours. Have been in coordination with
surrounding offices and WPC to also consider Flash Flood Watch
issuance with this package. Based on WPC Day 2 and 3 Excessive
Rainfall Outlook for SLIGHT to MODERATE, will issue Flash Flood
Watch with this package for the entire CWA to go into effect noon
Tuesday through midnight Wednesday night. Little in the way of
change of thinking on impact magnitudes. Storm surge inundation in
the 2-4 foot range still expected in the watch area. QPF is
coming in with 3-4 inch areal average along the track, but feel
some banding of higher amounts to 6 inches are in play.
Temperatures should be held down a bit due to increasing cloud
cover, in the mid to upper 80s, with lows running the usual mid
70s to lower 80s. If track timing holds true, most influences of
PTC SEVEN should lift out of the forecast area by sunset
Wednesday.
LONG TERM...
A return to onshore flow pattern with daily lake and breeze features
for typical rainfall pattern Wednesday night into the weekend.
Temperatures should reach only the upper 80s for highs each day as
barotropic conditions prevail.
.AVIATION...
.Updated 1747Z...
Latest radar trends continue to illustrate spotty showers and
thunderstorms either over or near most area terminals. Expect this
trend to continue through the rest of the afternoon and evening.
With such a persistent easterly to southeasterly flow, some
banding is noted in some areas, which may allow for training of
some storms over one location. Within these storms, CIGS may
bounce as low as IFR due to reduced visibility in heavier rain.
Additionally, erratic gusty downdraft winds may be possible in
these storms in the range of 20 to 30kt, but should remain well
below severe limits. KLG
.MARINE...
All marine interests are urged to closely monitor the latest
tropical cyclone advisories. It is advised to remain in port until
the developing tropical cyclone moves inland and conditions improve
later in the day Wednesday. Winds and seas will be steadily
increasing in response to the system's development and eventual
track.
.DECISION SUPPORT...
DSS code: Red.
Deployed: None.
Activation: High Impact, Communications Desks.
Activities: Tropical Storm Warning in CWA.
Decision Support Services (DSS) Code Legend
Green = No weather impacts that require action.
Blue = Long-fused watch, warning, or advisory in effect or high
visibility event; Marginal risk severe or excessive rain.
Yellow = Heightened impacts with short-fused watch, warning or
advisory issuances; radar support for slight risk severe or
excessive rain.
Orange = High Impacts; Enhanced risk severe; nearby tropical events;
HazMat or other large episodes.
Red = Full engagement for Moderate to high risk of severe and/or
excessive rainfall, or direct tropical threats; Events of
National Significance.
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 72 88 72 81 / 30 50 40 70
BTR 73 88 73 85 / 30 50 40 60
ASD 74 86 74 85 / 30 60 60 70
MSY 78 86 76 85 / 30 60 60 60
GPT 74 85 75 83 / 30 70 80 80
PQL 75 85 75 83 / 40 70 80 80
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Tropical Storm Warning for LAZ039-040-046>050-056>070-072.
Flash Flood Watch from Tuesday afternoon through Wednesday
evening for LAZ034>037-039-040-046>050-056>072.
Coastal Flood Advisory until 8 PM CDT Tuesday for LAZ040-050-058-
060>062-064-072.
GM...Tropical Storm Warning for GMZ530-532-534-536-538-550-552-555-
557-570-572-575-577.
MS...Tropical Storm Warning for MSZ077-080>082.
Flash Flood Watch from Tuesday afternoon through Wednesday
evening for MSZ068>071-077-080>082.
Hurricane Watch for MSZ080>082.
GM...Tropical Storm Warning for GMZ532-534-536-538-550-552-555-557-
570-572-575-577.
&&Hazardous weather outlook, Sep 3, 11:55 AM CDT, 4 hours 18 minutes before
Hazardous Weather Outlook National Weather Service New Orleans LA 1155 AM CDT Mon Sep 3 2018 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>082-040500- 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- 1155 AM CDT Mon Sep 3 2018 This Hazardous Weather Outlook is for portions of Southeast Louisiana...South Mississippi and the adjacent coastal waters. .DAY ONE...This Afternoon and Tonight A Tropical Storm Warning is in effect from Morgan City to the Alabama state line and all of the Louisiana and Mississippi coastal waters. A Hurricane Watch is in effect for the Mississippi coastal counties. A Storm Surge Warning is in effect from the Mouth of the Mississippi River to the Alabama State Line. A Coastal Flood Advisory is in effect for Lake Pontchartrain and Lake Maurepas. Otherwise, tropical showers and thunderstorms will be capable of producing periods of heavy rainfall, at times in bands, gusty winds 35 to 45 mph and occasional lightning. Waterspouts and tropical funnels will be possible in marine areas. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Tropical Storm conditions are likely to be impacting a large portion of the outlook area from late Tuesday through much of Wednesday before conditions improve Wednesday evening. Tropical funnels and large waterspouts will be possible Tuesday and Wednesday. A few may move ashore near the coast. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today, but may be requested Tuesday through Thursday.
In the hours before
Special weather statement, Sep 3, 4:11 PM CDT, 2 minutes before
Special Weather Statement National Weather Service New Orleans LA 411 PM CDT MON SEP 3 2018 LAZ034>036-047-048-032200- East Feliciana-Pointe Coupee-West Baton Rouge-West Feliciana-East Baton Rouge- 411 PM CDT MON SEP 3 2018 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN WEST FELICIANA... CENTRAL WEST BATON ROUGE...EAST CENTRAL POINTE COUPEE...SOUTHWESTERN EAST FELICIANA AND NORTHWESTERN EAST BATON ROUGE PARISHES... At 410 PM CDT, a strong thunderstorm was located near Baker, moving northwest at 25 mph. Winds in excess of 30 mph are possible with this storm. Locations impacted include... Baton Rouge, Zachary, Baker, Port Allen, New Roads, Jackson, St. Francisville, Slaughter, Wakefield, Spillman, Brownfields and Baton Rouge Airport. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. LAT...LON 3061 9100 3043 9126 3079 9161 3095 9124 TIME...MOT...LOC 2110Z 136DEG 22KT 3062 9121
Special weather statement, Sep 3, 4:13 PM CDT, 0 minutes before
Special Weather Statement National Weather Service New Orleans LA 413 PM CDT MON SEP 3 2018 LAZ057>060-032200- St. Charles-St. John The Baptist-Upper Lafourche-St. James- 413 PM CDT MON SEP 3 2018 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. JOHN THE BAPTIST...SOUTHEASTERN ST. JAMES...SOUTHWESTERN ST. CHARLES AND NORTH CENTRAL LAFOURCHE PARISHES... At 413 PM CDT, a strong thunderstorm was located near Bayou Gauche, or 13 miles northwest of Larose, moving northwest at 25 mph. Locations impacted include... Gramercy, Lutcher, Mathews, Paradis, Des Allemands, South Vacherie, North Vacherie, Garyville, Wallace, Raceland, Chackbay, Bayou Gauche and Edgard. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. LAT...LON 2975 9033 2962 9048 2991 9086 3009 9063 TIME...MOT...LOC 2113Z 136DEG 21KT 2974 9047
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 11:07 PM CDT | Storm Surge Watch | LIX | Saint Bernard | 47 hr |
| Sep 3, 4:28 AM CDT | Tropical Storm Warning | LIX | Assumption, East Baton Rouge, Iberville, Saint Bernard, Saint James, Saint John the Baptist and 3 more | 48 hr |
| Sep 3, 4:45 AM CDT | Flash Flood Watch | LIX | Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more | 59 hr |
| Sep 3, 10:34 AM CDT | Storm Surge Warning | LIX | Saint Bernard | 42 hr |
| Sep 3, 4:11 PM CDT | Special Weather Statement | LIX | West Feliciana | 49 min |
| Sep 3, 10:34 AM CDT | Hurricane Watch | LIX | 6 hr | |
| Sep 3, 4:32 PM CDT | Hurricane Warning | LIX | 33 hr |
Nearby
Special Weather Statements in Louisiana, 2018Every special weather statement in 2018
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.