Alert archive / Alabama / Freeze Warnings in 2017

Freeze Warning 5, NWS Huntsville, AL

November 19, 20179 counties in Alabama

NWS Huntsville, AL issued this freeze warning at Nov 19, 2017, 2:30 AM CST for 9 counties in Alabama. It took effect at Nov 19, 2017, 9:00 PM CST. It was in force for 11 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: Nov 19, 2017, 2:30 AM CST (08:30 UTC)
In effect from: Nov 19, 2017, 9:00 PM CST
Expired: Nov 20, 2017, 8:00 AM CST
In force: 11 hr
Issued by: NWS Huntsville, AL

Counties Colbert County, AL, Cullman County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 104 km from the middle of the area, began a volume at 08:28 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

Birmingham, AL (KBMX), launched 00:00Z, 8.5 hours before the alert went out and 157 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: 17 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1193 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 409 m²/s²
0-3 km storm-relative helicity: 464 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 Huntsville, AL wrote its last area forecast discussion before this freeze warning went out at Nov 19, 2:25 AM CST, 5 minutes earlier.

Area forecast discussion, Nov 19, 2:25 AM CST, 5 minutes before

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Hazardous weather outlook, Nov 19, 2:22 AM CST, 8 minutes before

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In the hours before

Local storm report, Nov 18, 11:11 PM CST, 3 hours 19 minutes before

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Local storm report, Nov 18, 11:15 PM CST, 3 hours 15 minutes before

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Local storm report, Nov 18, 11:18 PM CST, 3 hours 12 minutes before

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Local storm report, Nov 18, 11:21 PM CST, 3 hours 9 minutes before

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Local storm report, Nov 18, 11:46 PM CST, 2 hours 44 minutes before

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Local storm report, Nov 18, 11:47 PM CST, 2 hours 43 minutes before

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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 18, 6:01 PM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison, Marshall, Morgan	29 min
Nov 18, 6:01 PM CST	Severe Thunderstorm Warning	HUN	Cullman	29 min
Nov 18, 6:09 PM CST	Severe Thunderstorm Warning	HUN	Jackson, Madison	39 min
Nov 18, 6:19 PM CST	Severe Thunderstorm Warning	HUN	Jackson, Madison, Marshall, Morgan	24 min
Nov 18, 6:33 PM CST	Special Weather Statement	HUN	Cullman	27 min
Nov 18, 6:40 PM CST	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Marshall	27 min
Nov 18, 7:02 PM CST	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	28 min

Nearby

Freeze Warnings in Alabama, 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; radar from the NEXRAD Level II archive.