Alert archive / Alabama / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 102, NWS Huntsville, AL

July 15, 2018Colbert County, Franklin County, Lauderdale County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 15, 2018, 12:56 PM CDT for Colbert County, Franklin County, Lauderdale County, Alabama. It was in force for 49 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: Jul 15, 2018, 12:56 PM CDT (17:56 UTC)
Expired: Jul 15, 2018, 1:45 PM CDT
In force: 49 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Colbert County, AL, Franklin County, AL, Lauderdale County, AL

The radar

The Columbus AFB radar (KGWX), 101 km from the middle of the area, began a volume at 17:56 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 12:00Z, 5.9 hours before the alert went out and 190 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: 724 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 38 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 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 Jul 15, 12:21 PM CDT, 35 minutes earlier.

Area forecast discussion, Jul 15, 12:21 PM CDT, 35 minutes before

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Hazardous weather outlook, Jul 15, 10:52 AM CDT, 2 hours 4 minutes before

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In the hours before

Special weather statement, Jul 15, 10:39 AM CDT, 2 hours 17 minutes before

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Special weather statement, Jul 15, 11:11 AM CDT, 1 hour 45 minutes before

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Special weather statement, Jul 15, 11:31 AM CDT, 1 hour 25 minutes before

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Special weather statement, Jul 15, 12:00 PM CDT, 56 minutes before

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Special weather statement, Jul 15, 12:25 PM CDT, 31 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
Jul 15, 3:30 AM CDT	Heat Advisory	HUN	Colbert, Franklin, Lauderdale	13 hr
Jul 15, 10:10 AM CDT	Flash Flood Warning	HUN	Lawrence, Limestone, Morgan	2 hr
Jul 15, 10:39 AM CDT	Special Weather Statement	HUN	Limestone	51 min
Jul 15, 11:31 AM CDT	Special Weather Statement	HUN	Limestone	44 min
Jul 15, 12:25 PM CDT	Special Weather Statement	HUN	Colbert, Lauderdale	65 min
Jul 15, 1:22 PM CDT	Special Weather Statement	HUN	Franklin	38 min
Jul 15, 1:43 PM CDT	Special Weather Statement	HUN	Franklin	47 min
Jul 15, 2:00 PM CDT	Special Weather Statement	HUN	Franklin	30 min
Jul 15, 4:46 PM CDT	Special Weather Statement	HUN	Limestone	44 min
Jul 15, 5:12 PM CDT	Special Weather Statement	HUN	Cullman	48 min
Jul 15, 11:11 AM CDT	Special Weather Statement	HUN	Franklin, Moore	49 min
Jul 15, 12:00 PM CDT	Special Weather Statement	HUN	Franklin, Moore	45 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2018 Every severe thunderstorm warning in 2018

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.