Alert archive / Louisiana / Freeze Warnings in 2017

Freeze Warning 6, NWS New Orleans, LA

December 8, 20174 parishes in Louisiana

NWS New Orleans, LA issued this freeze warning at Dec 8, 2017, 3:20 PM CST for 4 parishes in Louisiana. It took effect at Dec 8, 2017, 6:00 PM CST. It was in force for 16 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 8, 2017, 3:20 PM CST (21:20 UTC)
In effect from: Dec 8, 2017, 6:00 PM CST
Expired: Dec 9, 2017, 10:00 AM CST
In force: 16 hr
Issued by: NWS New Orleans, LA

Counties Assumption Parish, LA, Saint Bernard Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.3 hours before the alert went out and 86 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 470 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: -152 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze warning 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 freeze warning went out at Dec 8, 1:01 PM CST, 2 hours 19 minutes earlier.

Area forecast discussion, Dec 8, 1:01 PM CST, 2 hours 19 minutes before

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Hazardous weather outlook, Dec 8, 3:20 PM CST, 0 minutes before

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In the hours before

Local storm report, Dec 8, 9:29 AM CST, 5 hours 51 minutes before

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Special weather statement, Dec 8, 10:46 AM CST, 4 hours 34 minutes before

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Local storm report, Dec 8, 11:48 AM CST, 3 hours 32 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
Dec 8, 3:21 AM CST	Special Weather Statement	LIX	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 3 more	54 min
Dec 8, 8:32 AM CST	Winter Storm Warning	LIX	East Feliciana, Pointe Coupee, Saint Helena, Tangipahoa, Washington, West Feliciana	9 hr
Dec 8, 10:46 AM CST	Special Weather Statement	LIX	Jefferson, Lafourche, Orleans, Plaquemines	3 hr
Dec 8, 11:27 AM CST	Hard Freeze Warning	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Helena, Tangipahoa and 3 more	23 hr
Dec 7, 9:04 PM CST	Special Weather Statement	LIX	Walthall	26 min
Dec 8, 12:46 AM CST	Special Weather Statement	LIX	Pike, Walthall	29 min

Nearby

Freeze Warnings in Louisiana, 2017 Every freeze warning 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.