Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

May 10, 2021Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at May 10, 2021, 6:16 AM CDT for Saint Charles Parish, Louisiana. It was in force for 44 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
May 10, 2021, 6:16 AM CDT (11:16 UTC)
Expired
May 10, 2021, 7:00 AM CDT
In force
44 min
Issued by
NWS New Orleans, LA

County Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.3 hours before the alert went out and 69 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2021-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 186 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2021-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
186 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1292 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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 May 10, 6:16 AM CDT, 0 minutes earlier.

Area forecast discussion, May 10, 6:16 AM CDT, 0 minutes before
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In the hours before

Local storm report, May 10, 4:16 AM CDT, 2 hours before
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Local storm report, May 10, 5:35 AM CDT, 41 minutes before
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Special weather statement, May 10, 5:38 AM CDT, 38 minutes before
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Special weather statement, May 10, 6:04 AM CDT, 12 minutes before
Special Weather Statement
National Weather Service New Orleans LA
604 AM CDT Mon May 10 2021

LAZ034-046>049-101200-
Iberville-Ascension-Pointe Coupee-West Baton Rouge-East Baton Rouge-
604 AM CDT Mon May 10 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN ASCENSION...WEST
BATON ROUGE...SOUTH CENTRAL POINTE COUPEE...NORTHERN IBERVILLE AND
SOUTHWESTERN EAST BATON ROUGE PARISHES...

At 604 AM CDT, a strong thunderstorm was located near Ramah, or 14
miles southeast of Krotz Springs, moving east at 35 mph.

Winds in excess of 40 mph and penny size hail are possible with this
storm.

Locations impacted include...
Baton Rouge, Plaquemine, Port Allen, Oak Hills Place, St. Gabriel,
Addis, Brusly, Maringouin, Rosedale, Grosse Tete, Westminster, Old
Jefferson, Merrydale, Erwinville, Inniswold, Ramah, Village St.
George, Shenandoah, Gardere and Brownfields.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 127 and 171.
 Interstate 12 between mile markers 1 and 8.
 Interstate 110 in Louisiana between mile markers 1 and 8.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3051 9164 3057 9100 3026 9099 3033 9163
      3035 9163 3036 9164 3038 9164 3038 9163
      3041 9163 3043 9164
TIME...MOT...LOC 1104Z 268DEG 31KT 3043 9155
Special weather statement, May 10, 6:06 AM CDT, 10 minutes before
Special Weather Statement
National Weather Service New Orleans LA
606 AM CDT Mon May 10 2021

LAZ034>036-MSZ068-069-101200-
East Feliciana-Pointe Coupee-West Feliciana-Wilkinson-Amite-
606 AM CDT Mon May 10 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN WEST FELICIANA...
NORTHWESTERN POINTE COUPEE AND NORTH CENTRAL EAST FELICIANA
PARISHES...WILKINSON AND WESTERN AMITE COUNTIES...

At 606 AM CDT, a strong thunderstorm was located near Big Bend, or 8
miles east of Bordelonville, moving east at 45 mph.

Winds in excess of 40 mph and penny size hail are possible with this
storm.

Locations impacted include...
Centreville, Woodville, Gloster, Norwood, Lettsworth, Fort Adams and
Crosby.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3104 9172 3104 9165 3097 9166 3100 9163
      3104 9156 3107 9157 3112 9162 3123 9157
      3124 9153 3122 9151 3125 9148 3134 9100
      3133 9099 3135 9097 3095 9093 3093 9180
      3097 9181
TIME...MOT...LOC 1106Z 257DEG 38KT 3111 9176
Special weather statement, May 10, 6:16 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service New Orleans LA
616 AM CDT Mon May 10 2021

LAZ057-058-060-061-063-077-101200-
Western Orleans-St. Charles-St. John The Baptist-St. James-Upper
Plaquemines-Upper Jefferson-
616 AM CDT Mon May 10 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. JOHN THE
BAPTIST...SOUTHEASTERN ST. JAMES...NORTHERN ST. CHARLES...
SOUTHWESTERN ORLEANS...NORTHWESTERN JEFFERSON AND NORTHWESTERN
PLAQUEMINES PARISHES...

At 616 AM CDT, a strong thunderstorm was located near Edgard, or near
Reserve, moving east at 25 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
New Orleans, Reserve, Avondale, Metairie, Hahnville, Laplace,
Marrero, Harvey, Timberlane, Belle Chasse, Jefferson, Gretna,
Harahan, Westwego, Montz, Luling, Garyville, River Ridge, Boutte and
Ama.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 212 and 242.
 Interstate 310 between mile markers 1 and 11.
 Interstate 610 between mile markers 1 and 4.

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 2988 9053 2989 9054 2989 9060 2990 9069
      3008 9066 3008 9040 3006 9037 3005 9026
      3002 9018 3003 9003 3006 9003 3004 9001
      2980 9001
TIME...MOT...LOC 1116Z 278DEG 22KT 2998 9059

MSW

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 8:48 PM CDTFlash Flood WatchLIXAssumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more15 hr
May 10, 1:00 AM CDTSpecial Weather StatementLIXAscension, Livingston60 min
May 10, 1:29 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville, Saint James70 min
May 10, 1:49 AM CDTSpecial Weather StatementLIXAssumption, Saint James, Saint John the Baptist56 min
May 10, 1:54 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Saint James51 min
May 10, 2:01 AM CDTSpecial Marine WarningLIX59 min
May 10, 2:43 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles2 hr
May 10, 2:52 AM CDTSpecial Marine WarningLIX53 min
May 10, 2:57 AM CDTFlash Flood WarningLIXJefferson, Orleans, Saint Charles9 hr
May 10, 3:25 AM CDTSpecial Weather StatementLIXOrleans35 min
May 10, 3:37 AM CDTSpecial Marine WarningLIX113 min
May 10, 3:41 AM CDTTornado WarningLIXOrleans, Plaquemines, Saint Bernard18 min
May 10, 4:20 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard115 min
May 10, 5:26 AM CDTSpecial Marine WarningLIX64 min
May 10, 5:29 AM CDTSpecial Marine WarningLIX2 hr
May 10, 5:38 AM CDTSpecial Weather StatementLIXWest Baton Rouge67 min
May 10, 6:04 AM CDTSpecial Weather StatementLIXEast Baton Rouge, West Baton Rouge56 min
May 10, 6:36 AM CDTSpecial Marine WarningLIX54 min
May 10, 7:25 AM CDTSpecial Weather StatementLIXSaint John the Baptist50 min
May 10, 7:34 AM CDTSpecial Marine WarningLIX56 min
May 10, 7:51 AM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Baton Rouge54 min
May 10, 8:23 AM CDTSpecial Marine WarningLIX67 min
May 10, 8:28 AM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge62 min
May 10, 9:16 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 2 more44 min
May 10, 9:38 AM CDTTornado WarningLIXAscension, Livingston, Saint James, Saint John the Baptist20 min
May 10, 9:57 AM CDTSpecial Weather StatementLIXAssumption, Orleans, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany63 min
May 10, 10:29 AM CDTSpecial Marine WarningLIX61 min
May 10, 11:08 AM CDTSpecial Weather StatementLIXOrleans52 min
May 10, 11:17 AM CDTSpecial Marine WarningLIX58 min
May 10, 12:10 PM CDTSpecial Marine WarningLIX65 min
May 10, 12:14 PM CDTSpecial Marine WarningLIX91 min
May 10, 1:08 PM CDTSpecial Marine WarningLIX67 min
May 10, 1:44 PM CDTSpecial Marine WarningLIX28 min
May 10, 2:09 PM CDTSpecial Marine WarningLIX66 min
May 10, 3:09 PM CDTSpecial Marine WarningLIX96 min
May 10, 4:05 AM CDTSevere Thunderstorm WarningLIXHancock25 min
May 10, 6:06 AM CDTSpecial Weather StatementLIXWilkinson54 min

Nearby

Special Weather Statements in Louisiana, 2021Every special weather statement 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.