Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 57, NWS Huntsville, AL

March 27, 2017Lawrence County, Limestone County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Mar 27, 2017, 9:22 PM CDT for Lawrence County, Limestone County, Alabama. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 27, 2017, 9:22 PM CDT (02:22 UTC)
Expired: Mar 27, 2017, 10:15 PM CDT
In force: 53 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lawrence County, AL, Limestone County, AL

The radar

The Northeast Alabama radar (KHTX), 101 km from the middle of the area, began a volume at 02:22 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, 2.4 hours before the alert went out and 169 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: 127 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1855 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Mar 27, 6:50 PM CDT, 2 hours 32 minutes earlier.

Area forecast discussion, Mar 27, 6:50 PM CDT, 2 hours 32 minutes before

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Hazardous weather outlook, Mar 27, 9:14 PM CDT, 8 minutes before

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In the hours before

Special weather statement, Mar 27, 8:35 PM CDT, 47 minutes before

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Local storm report, Mar 27, 8:41 PM CDT, 41 minutes before

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Local storm report, Mar 27, 8:44 PM CDT, 38 minutes before

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Special weather statement, Mar 27, 8:58 PM CDT, 24 minutes before

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Local storm report, Mar 27, 9:15 PM CDT, 7 minutes before

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Local storm report, Mar 27, 9:18 PM CDT, 4 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
Mar 27, 7:05 PM CDT	Severe Thunderstorm Warning	HUN	Marshall	10 min
Mar 27, 8:15 PM CDT	Special Weather Statement	HUN	Lauderdale	45 min
Mar 27, 8:31 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Lauderdale	59 min
Mar 27, 8:58 PM CDT	Special Weather Statement	HUN	Colbert	62 min
Mar 27, 9:21 PM CDT	Severe Thunderstorm Warning	HUN	Colbert, Franklin	39 min
Mar 27, 9:47 PM CDT	Special Weather Statement	HUN	Jackson	43 min
Mar 27, 9:48 PM CDT	Special Weather Statement	HUN	Madison	57 min
Mar 27, 10:03 PM CDT	Special Weather Statement	HUN	Franklin, Lawrence	27 min
Mar 27, 10:14 PM CDT	Special Weather Statement	HUN	Limestone	31 min
Mar 27, 10:28 PM CDT	Special Weather Statement	HUN	Morgan	32 min
Mar 27, 10:50 PM CDT	Special Weather Statement	HUN	Franklin	25 min
Mar 27, 11:17 PM CDT	Special Weather Statement	HUN	DeKalb	28 min
Mar 27, 8:35 PM CDT	Special Weather Statement	HUN	Lincoln, Moore	25 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2017 Every severe thunderstorm 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.