Alert archive / Alabama / Special Weather Statements in 2016

Special Weather Statement, NWS Huntsville, AL

December 18, 2016DeKalb County, Alabama

NWS Huntsville, AL issued this special weather statement at Dec 18, 2016, 4:21 AM CST for DeKalb County, Alabama. It was in force for 24 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: Dec 18, 2016, 4:21 AM CST (10:21 UTC)
Expired: Dec 18, 2016, 4:45 AM CST
In force: 24 min
Issued by: NWS Huntsville, AL

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 65 km from the middle of the area, began a volume at 10:24 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, 10.4 hours before the alert went out and 183 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: 84 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 455 m²/s²
0-3 km storm-relative helicity: 541 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 Huntsville, AL wrote its last area forecast discussion before this special weather statement went out at Dec 18, 2:47 AM CST, 1 hour 34 minutes earlier.

Area forecast discussion, Dec 18, 2:47 AM CST, 1 hour 34 minutes before

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Hazardous weather outlook, Dec 18, 3:17 AM CST, 1 hour 4 minutes before

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In the hours before

Special weather statement, Dec 18, 2:16 AM CST, 2 hours 5 minutes before

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Special weather statement, Dec 18, 2:20 AM CST, 2 hours 1 minute before

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Special weather statement, Dec 18, 2:28 AM CST, 1 hour 53 minutes before

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Local storm report, Dec 18, 3:46 AM CST, 35 minutes before

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Special weather statement, Dec 18, 4:00 AM CST, 21 minutes before

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Special weather statement, Dec 18, 4:21 AM CST, 0 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
Dec 17, 11:12 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	33 min
Dec 17, 11:20 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	40 min
Dec 17, 11:23 PM CST	Tornado Warning	HUN	Lauderdale	37 min
Dec 17, 11:27 PM CST	Tornado Warning	HUN	Colbert, Lauderdale	33 min
Dec 17, 11:45 PM CST	Severe Thunderstorm Warning	HUN	Lauderdale	30 min
Dec 17, 11:55 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	35 min
Dec 18, 12:08 AM CST	Severe Thunderstorm Warning	HUN	Lauderdale	37 min
Dec 18, 12:20 AM CST	Severe Thunderstorm Warning	HUN	Colbert, Franklin	40 min
Dec 18, 12:25 AM CST	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	35 min
Dec 18, 12:40 AM CST	Severe Thunderstorm Warning	HUN	Franklin	35 min
Dec 18, 1:06 AM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison	24 min
Dec 18, 1:14 AM CST	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lawrence	31 min
Dec 18, 1:30 AM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison	45 min
Dec 18, 1:46 AM CST	Special Weather Statement	HUN	Lawrence	29 min
Dec 18, 1:48 AM CST	Severe Thunderstorm Warning	HUN	Limestone, Madison, Morgan	27 min
Dec 18, 2:16 AM CST	Special Weather Statement	HUN	Morgan	29 min
Dec 18, 2:20 AM CST	Special Weather Statement	HUN	Madison	25 min
Dec 18, 2:28 AM CST	Special Weather Statement	HUN	Madison	32 min
Dec 18, 4:00 AM CST	Special Weather Statement	HUN	Jackson	15 min
Dec 18, 12:51 AM CST	Severe Thunderstorm Warning	HUN	Lincoln, Moore	24 min
Dec 18, 1:19 AM CST	Severe Thunderstorm Warning	HUN	Lincoln, Moore	26 min

Nearby

Special Weather Statements in Alabama, 2016 Every special weather statement in 2016

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.