Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

August 11, 2021Saint Charles Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 11, 2021, 1:40 PM CDT for Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 65 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 11, 2021, 1:40 PM CDT (18:40 UTC)
Expired: Aug 11, 2021, 2:45 PM CDT
In force: 65 min
Issued by: NWS New Orleans, LA
Hail: 0.00 in
Wind: 30

Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.7 hours before the alert went out and 74 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: 3290 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 603 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 11 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 11, 12:14 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Aug 11, 12:14 PM CDT, 1 hour 26 minutes before

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In the hours before

Special weather statement, Aug 11, 11:44 AM CDT, 1 hour 56 minutes before

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Special weather statement, Aug 11, 12:04 PM CDT, 1 hour 36 minutes before

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Special weather statement, Aug 11, 12:21 PM CDT, 1 hour 19 minutes before

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Special weather statement, Aug 11, 12:28 PM CDT, 1 hour 12 minutes before

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Special weather statement, Aug 11, 1:40 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 11, 8:28 AM CDT	Special Marine Warning	LIX		62 min
Aug 11, 10:59 AM CDT	Special Marine Warning	LIX		2 hr
Aug 11, 12:04 PM CDT	Special Weather Statement	LIX	Saint Tammany	56 min
Aug 11, 12:21 PM CDT	Special Weather Statement	LIX	Jefferson	69 min
Aug 11, 12:28 PM CDT	Special Weather Statement	LIX	Saint Tammany	62 min
Aug 11, 12:35 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	66 min
Aug 11, 1:54 PM CDT	Special Weather Statement	LIX	Livingston	81 min
Aug 11, 2:28 PM CDT	Special Weather Statement	LIX	Assumption	77 min
Aug 11, 2:31 PM CDT	Special Weather Statement	LIX	Washington	74 min
Aug 11, 2:35 PM CDT	Special Weather Statement	LIX	Saint James	25 min
Aug 11, 2:51 PM CDT	Special Weather Statement	LIX	Plaquemines	54 min
Aug 11, 3:24 PM CDT	Special Weather Statement	LIX	East Baton Rouge	36 min
Aug 11, 3:40 PM CDT	Special Weather Statement	LIX	Iberville	35 min
Aug 11, 3:48 PM CDT	Special Marine Warning	LIX		57 min
Aug 11, 4:20 PM CDT	Special Weather Statement	LIX	Pointe Coupee	40 min
Aug 11, 5:11 PM CDT	Special Weather Statement	LIX	West Feliciana	64 min
Aug 11, 11:44 AM CDT	Special Weather Statement	LIX	Jackson	76 min
Aug 11, 5:48 PM CDT	Special Weather Statement	LIX	Wilkinson	27 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.