Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

May 10, 20216 parishes in Louisiana

NWS New Orleans, LA issued this special weather statement at May 10, 2021, 9:57 AM CDT for 6 parishes in Louisiana. It was in force for 63 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, 9:57 AM CDT (14:57 UTC)
Expired: May 10, 2021, 11:00 AM CDT
In force: 63 min
Issued by: NWS New Orleans, LA

Counties Assumption Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.0 hours before the alert went out and 71 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: 161 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 943 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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, 7:53 AM CDT, 2 hours 4 minutes earlier.

Area forecast discussion, May 10, 7:53 AM CDT, 2 hours 4 minutes before

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In the hours before

Special weather statement, May 10, 5:38 AM CDT, 4 hours 19 minutes before

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Special weather statement, May 10, 6:04 AM CDT, 3 hours 53 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, 3 hours 51 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, 3 hours 41 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

Special weather statement, May 10, 7:25 AM CDT, 2 hours 32 minutes before

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Special weather statement, May 10, 9:57 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
957 AM CDT Mon May 10 2021

LAZ049-050-056>061-063>067-072-075>078-101600-
Lower Terrebonne-St. Charles-Livingston-Eastern
Orleans-Ascension-Upper Terrebonne-Southern Tangipahoa-St.
James-Southeast St. Tammany-Western Orleans-Upper St.
Bernard-Northwest St. Tammany-Lower Lafourche-Assumption-St. John The
Baptist-Upper Plaquemines-Upper Lafourche-Upper Jefferson-
957 AM CDT Mon May 10 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT WEST CENTRAL ST.
BERNARD...WESTERN ORLEANS...CENTRAL ST. TAMMANY...NORTHEASTERN
TERREBONNE...NORTHWESTERN LAFOURCHE...NORTHWESTERN JEFFERSON...ST.
JOHN THE BAPTIST...EAST CENTRAL ASCENSION...ST. JAMES...ST.
CHARLES...EASTERN LIVINGSTON...SOUTHERN TANGIPAHOA...NORTHWESTERN
PLAQUEMINES AND ASSUMPTION PARISHES...

At 957 AM CDT, radar indicated strong thunderstorms were located
along a line extending from Ponchatoula to Wallace to near Bayou
Geneve. Movement was east at 35 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
New Orleans, Houma, Slidell, Hammond, Thibodaux, Covington,
Napoleonville, Reserve, Metairie, Hahnville, Laplace, Marrero,
Chalmette, Avondale, Harvey, East New Orleans, Timberlane, Belle
Chasse, Jefferson and Gretna.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 189 and 213, and
between mile markers 215 and 255, and near mile marker 261.
 Interstate 12 between mile markers 29 and 84.
 Interstate 55 in Louisiana between mile markers 1 and 33.
 Interstate 59 in Louisiana between mile markers 2 and 11.
 Interstate 310 between mile markers 1 and 11.
 Interstate 510 between mile markers 1 and 3.
 Interstate 610 between mile markers 1 and 4.

If outdoors, consider seeking shelter inside a building.

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 2966 9110 2981 9110 2986 9120 3000 9126
      3010 9081 3055 9063 3047 8970 3044 8968
      3021 8979 3026 8998 3039 9019 3022 9040
      3018 9043 3006 9038 3002 9018 3004 9000
      3015 8986 3015 8985 2984 8999 2931 9089
TIME...MOT...LOC 1457Z 285DEG 32KT 3044 9048 3005 9065 2985 9111

MEFFER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 8:48 PM CDT	Flash Flood Watch	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more	15 hr
May 10, 1:00 AM CDT	Special Weather Statement	LIX	Ascension, Livingston	60 min
May 10, 1:29 AM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, Iberville, Saint James	70 min
May 10, 1:49 AM CDT	Special Weather Statement	LIX	Assumption, Saint James, Saint John the Baptist	56 min
May 10, 1:54 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Saint James	51 min
May 10, 2:01 AM CDT	Special Marine Warning	LIX		59 min
May 10, 2:43 AM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles	2 hr
May 10, 2:52 AM CDT	Special Marine Warning	LIX		53 min
May 10, 2:57 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Saint Charles	9 hr
May 10, 3:25 AM CDT	Special Weather Statement	LIX	Orleans	35 min
May 10, 3:37 AM CDT	Special Marine Warning	LIX		113 min
May 10, 3:41 AM CDT	Tornado Warning	LIX	Orleans, Plaquemines, Saint Bernard	18 min
May 10, 4:20 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	115 min
May 10, 5:26 AM CDT	Special Marine Warning	LIX		64 min
May 10, 5:29 AM CDT	Special Marine Warning	LIX		2 hr
May 10, 5:38 AM CDT	Special Weather Statement	LIX	West Baton Rouge	67 min
May 10, 6:04 AM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	56 min
May 10, 6:16 AM CDT	Special Weather Statement	LIX	Saint Charles	44 min
May 10, 6:36 AM CDT	Special Marine Warning	LIX		54 min
May 10, 7:25 AM CDT	Special Weather Statement	LIX	Saint John the Baptist	50 min
May 10, 7:34 AM CDT	Special Marine Warning	LIX		56 min
May 10, 7:51 AM CDT	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	54 min
May 10, 8:23 AM CDT	Special Marine Warning	LIX		67 min
May 10, 8:28 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge	62 min
May 10, 9:16 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 2 more	44 min
May 10, 9:38 AM CDT	Tornado Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist	20 min
May 10, 10:29 AM CDT	Special Marine Warning	LIX		61 min
May 10, 11:08 AM CDT	Special Weather Statement	LIX	Orleans	52 min
May 10, 11:17 AM CDT	Special Marine Warning	LIX		58 min
May 10, 12:10 PM CDT	Special Marine Warning	LIX		65 min
May 10, 12:14 PM CDT	Special Marine Warning	LIX		91 min
May 10, 1:08 PM CDT	Special Marine Warning	LIX		67 min
May 10, 1:44 PM CDT	Special Marine Warning	LIX		28 min
May 10, 2:09 PM CDT	Special Marine Warning	LIX		66 min
May 10, 3:09 PM CDT	Special Marine Warning	LIX		96 min
May 10, 4:05 AM CDT	Severe Thunderstorm Warning	LIX	Hancock	25 min
May 10, 6:06 AM CDT	Special Weather Statement	LIX	Wilkinson	54 min

Nearby

Special Weather Statements in Louisiana, 2021 Every 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.