Alert archive / Louisiana / Special Weather Statements in 2018

Special Weather Statement, NWS New Orleans, LA

August 6, 2018Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 6, 2018, 2:06 PM CDT for Saint Charles Parish, Louisiana. It was in force for 24 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: Aug 6, 2018, 2:06 PM CDT (19:06 UTC)
Expired: Aug 6, 2018, 2:30 PM CDT
In force: 24 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, 7.1 hours before the alert went out and 63 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2400 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Aug 6, 12:18 PM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Aug 6, 12:18 PM CDT, 1 hour 48 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
1218 PM CDT Mon Aug 6 2018

.AVIATION...

VFR conditions will prevail at all of the terminals outside of
convective impacts. Convection is most likely to occur around
KHUM, KMSY, and KBTR. If convection does directly impact a
terminal, a brief period of reduced visibilities, lower ceilings,
and gusty winds can be expected. 32

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  72  94  73  92 /  10  20   0  30
BTR  74  92  75  92 /   0  30   0  40
ASD  75  92  75  91 /   0  20  10  30
MSY  77  91  77  91 /  10  30  10  40
GPT  76  91  77  90 /   0  20  10  30
PQL  74  92  75  92 /   0  20  10  30

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&

Hazardous weather outlook, Aug 6, 11:04 AM CDT, 3 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service New Orleans LA
1104 AM CDT Mon Aug 6 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>082-070415-
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-
1104 AM CDT Mon Aug 6 2018

This Hazardous Weather Outlook is for portions of Southeast
Louisiana...South Mississippi and the adjacent coastal waters.

.DAY ONE...This Afternoon and Tonight

Isolated to scattered thunderstorms are expected later this
afternoon and evening. Expect better coverage across western
portions of the area, or generally west of I-55. Any one storm
may be locally strong and produce frequent lightning, gusty winds
and heavy rainfall.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Spotty afternoon thunderstorms will persist into Tuesday and
Wednesday, with more widespread coverage expected Thursday
throughSunday. Any one storm may be locally strong and produce
frequent lightning, gusty winds and heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

32

In the hours before

Special weather statement, Aug 6, 2:06 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
206 PM CDT MON AUG 6 2018

LAZ060-061-061930-
St. Charles-Upper Jefferson-
206 PM CDT MON AUG 6 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL ST. CHARLES AND
NORTHWESTERN JEFFERSON PARISHES...

At 205 PM CDT, a strong thunderstorm was located near Norco, or 7
miles northeast of Hahnville. The storm is nearly stationary.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
St. Rose.

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 2997 9031 3007 9040 3006 9037 3006 9030
      3005 9026 3004 9025 2999 9024
TIME...MOT...LOC 1905Z 157DEG 1KT 3005 9032

32

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 2:03 PM CDT	Special Marine Warning	LIX		27 min
Aug 6, 2:27 PM CDT	Special Marine Warning	LIX		33 min
Aug 6, 2:29 PM CDT	Special Weather Statement	LIX	Saint Charles	31 min
Aug 6, 3:04 PM CDT	Special Weather Statement	LIX	Saint James	41 min
Aug 6, 3:27 PM CDT	Special Weather Statement	LIX	Tangipahoa	48 min
Aug 6, 3:57 PM CDT	Special Weather Statement	LIX	West Baton Rouge	48 min
Aug 6, 4:02 PM CDT	Special Weather Statement	LIX	Tangipahoa	43 min
Aug 6, 4:59 PM CDT	Special Weather Statement	LIX	Pearl River	46 min

Nearby

Special Weather Statements in Louisiana, 2018 Every 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.