Alert archive / Louisiana / Special Weather Statements in 2019

Special Weather Statement, NWS New Orleans, LA

August 19, 2019Saint Helena Parish, Louisiana; Amite County, Mississippi

NWS New Orleans, LA issued this special weather statement at Aug 19, 2019, 5:21 PM CDT for Saint Helena Parish, Louisiana; Amite County, Mississippi. It was in force for 39 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 19, 2019, 5:21 PM CDT (22:21 UTC)
Expired: Aug 19, 2019, 6:00 PM CDT
In force: 39 min
Issued by: NWS New Orleans, LA

Counties Saint Helena Parish, LA, Amite County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.4 hours before the alert went out and 138 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: 2545 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 15 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 19, 4:02 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Aug 19, 4:02 PM CDT, 1 hour 19 minutes before

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Hazardous weather outlook, Aug 19, 1:00 PM CDT, 4 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service New Orleans LA
100 PM CDT Mon Aug 19 2019

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>082-200600-
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-
100 PM CDT Mon Aug 19 2019

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

.DAY ONE...This Afternoon and Tonight

Numerous thunderstorms are expected to continue today. Some of
these storms could become strong and produce gusty winds, frequent
lightning and locally heavy rainfall.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Scattered thunderstorms are expected each day during the week.
Some of these storms could become strong and produce gusty winds,
frequent lightning and locally heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Special weather statement, Aug 19, 1:35 PM CDT, 3 hours 46 minutes before

Special Weather Statement
National Weather Service New Orleans LA
135 PM CDT Mon Aug 19 2019

LAZ040-062-MSZ080-191915-
Orleans LA-St. Tammany LA-Hancock MS-
135 PM CDT Mon Aug 19 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN ORLEANS...
SOUTHEASTERN ST. TAMMANY PARISHES IN SOUTHEASTERN LOUISIANA AND
SOUTHERN HANCOCK COUNTIES UNTIL 215 PM CDT...

At 135 PM CDT, Doppler radar was tracking a strong thunderstorm near
Pearl River, or near Slidell, moving southwest at 15 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Slidell, Waveland, Pearl River, Lake Catherine, Pearlington, Lacombe,
Stennis Space Center and Slidell Airport.

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.

&&

LAT...LON 3018 8946 3019 8946 3015 8958 3015 8961
      3017 8958 3016 8966 3015 8963 3003 8975
      3005 8980 3015 8988 3010 8981 3017 8974
      3015 8972 3018 8968 3018 8975 3025 8987
      3026 8997 3036 9005 3043 8968 3027 8939
TIME...MOT...LOC 1835Z 059DEG 12KT 3032 8972

Local storm report, Aug 19, 2:59 PM CDT, 2 hours 22 minutes before

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Special weather statement, Aug 19, 4:43 PM CDT, 38 minutes before

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Special weather statement, Aug 19, 5:21 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 7:09 PM CDT	Special Weather Statement	LIX	Orleans	36 min
Aug 18, 8:15 PM CDT	Areal Flood Advisory	LIX	Saint Helena	2 hr
Aug 19, 3:15 AM CDT	Special Marine Warning	LIX		60 min
Aug 19, 5:52 AM CDT	Special Weather Statement	LIX	Plaquemines	23 min
Aug 19, 8:38 AM CDT	Special Marine Warning	LIX		67 min
Aug 19, 9:18 AM CDT	Special Weather Statement	LIX	Orleans	27 min
Aug 19, 9:21 AM CDT	Special Marine Warning	LIX		84 min
Aug 19, 9:44 AM CDT	Special Weather Statement	LIX	Orleans	46 min
Aug 19, 10:17 AM CDT	Special Weather Statement	LIX	Jefferson	43 min
Aug 19, 10:33 AM CDT	Special Marine Warning	LIX		57 min
Aug 19, 12:17 PM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, Iberville, Lafourche, Saint Charles, Saint James and 1 more	118 min
Aug 19, 1:25 PM CDT	Special Marine Warning	LIX		50 min
Aug 19, 1:35 PM CDT	Special Weather Statement	LIX	Orleans	40 min
Aug 19, 2:07 PM CDT	Areal Flood Advisory	LIX	Orleans, Saint Tammany	53 min
Aug 19, 2:35 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	115 min
Aug 19, 2:36 PM CDT	Special Marine Warning	LIX		9 min
Aug 19, 3:35 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	115 min
Aug 19, 4:43 PM CDT	Special Weather Statement	LIX	Pike, Walthall	47 min
Aug 19, 5:12 PM CDT	Areal Flood Advisory	LIX	Amite	2 hr
Aug 19, 5:23 PM CDT	Special Weather Statement	LIX	Wilkinson	37 min

Nearby

Special Weather Statements in Louisiana, 2019 Special Weather Statements in Mississippi, 2019 Every special weather statement in 2019

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.