Alert archive / Louisiana / Hard Freeze Warnings in 2017

Hard Freeze Warning 4, NWS New Orleans, LA

December 8, 20179 parishes in Louisiana; 5 counties in Mississippi

NWS New Orleans, LA issued this hard freeze warning at Dec 8, 2017, 11:27 AM CST for 9 parishes in Louisiana; 5 counties in Mississippi. 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, 11:27 AM CST (17:27 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 East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.5 hours before the alert went out and 123 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 hard 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 hard freeze warning went out at Dec 8, 3:58 AM CST, 7 hours 29 minutes earlier.

Area forecast discussion, Dec 8, 3:58 AM CST, 7 hours 29 minutes before

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Hazardous weather outlook, Dec 8, 9:58 AM CST, 1 hour 29 minutes before

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In the hours before

Special weather statement, Dec 8, 5:50 AM CST, 5 hours 37 minutes before

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Local storm report, Dec 8, 8:27 AM CST, 3 hours before

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Local storm report, Dec 8, 9:29 AM CST, 1 hour 58 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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Special weather statement, Dec 8, 10:46 AM CST, 41 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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, 3:20 PM CST	Freeze Warning	LIX	Assumption, Saint Bernard, Saint James, Saint John the Baptist	19 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

Hard Freeze Warnings in Louisiana, 2017 Hard Freeze Warnings in Mississippi, 2017 Every hard 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.