Alert archive / Louisiana / Special Weather Statements in 2017

Special Weather Statement, NWS New Orleans, LA

August 7, 2017Saint Helena Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Aug 7, 2017, 5:15 PM CDT for Saint Helena Parish, Louisiana. It was in force for 75 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 7, 2017, 5:15 PM CDT (22:15 UTC)
Expired: Aug 7, 2017, 6:30 PM CDT
In force: 75 min
Issued by: NWS New Orleans, LA

County Saint Helena Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 10.3 hours before the alert went out and 194 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: 626 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 74 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 7, 4:10 PM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, Aug 7, 4:10 PM CDT, 1 hour 5 minutes before

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Hazardous weather outlook, Aug 7, 11:32 AM CDT, 5 hours 43 minutes before

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In the hours before

Special weather statement, Aug 7, 4:18 PM CDT, 57 minutes before

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Special weather statement, Aug 7, 4:30 PM CDT, 45 minutes before

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Special weather statement, Aug 7, 4:50 PM CDT, 25 minutes before

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Special weather statement, Aug 7, 5:15 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 7, 4:18 PM CDT	Special Weather Statement	LIX	East Feliciana	42 min
Aug 7, 4:30 PM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	45 min
Aug 7, 4:50 PM CDT	Special Weather Statement	LIX	Amite, Pike	70 min

Nearby

Special Weather Statements in Louisiana, 2017 Every special weather statement in 2017

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.