Alert archive / Louisiana / Frost Advisories in 2019

Frost Advisory 1, NWS Lake Charles, LA

October 31, 201910 parishes in Louisiana; 4 counties in Texas

NWS Lake Charles, LA issued this frost advisory at Oct 31, 2019, 3:55 AM CDT for 10 parishes in Louisiana; 4 counties in Texas. It took effect at Nov 1, 2019, 12:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Oct 31, 2019, 3:55 AM CDT (08:55 UTC)
In effect from: Nov 1, 2019, 12:00 AM CDT
Expired: Nov 1, 2019, 8:00 AM CDT
In force: 8 hr
Issued by: NWS Lake Charles, LA

Counties Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vernon Parish, LA, Hardin County, TX, Jasper County, TX, Newton County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 58 km from the middle of the area, began a volume at 09:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.9 hours before the alert went out and 317 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: 848 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 695 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lake Charles, LA wrote its last area forecast discussion before this frost advisory went out at Oct 30, 4:42 PM CDT, 11 hours 13 minutes earlier.

Area forecast discussion, Oct 30, 4:42 PM CDT, 11 hours 13 minutes before

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Hazardous weather outlook, Oct 30, 4:25 PM CDT, 11 hours 30 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 31, 11:12 AM CDT	Low Water Advisory	LCH		5 hr
Oct 31, 3:31 PM CDT	Freeze Warning	LCH	Avoyelles, Rapides, Vernon	16 hr
Oct 31, 11:33 AM CDT	River Flood Warning	LCH	Hardin, Jefferson	5 days

Nearby

Frost Advisories in Louisiana, 2019 Frost Advisories in Texas, 2019 Every frost advisory in 2019

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; radar from the NEXRAD Level II archive.