Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 81

January 13, 200513 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2005, 7:03 AM CST for 13 counties in Alabama. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jan 13, 2005, 7:03 AM CST (13:03 UTC)
Expired: Jan 13, 2005, 8:30 AM CST
In force: 87 min
Issued by: the Storm Prediction Center

Counties Blount County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Walker County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 103 km from the middle of the area, began a volume at 13:07 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 10Jan 13, 7:15 AM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 1.1 hours before the alert went out and 108 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: 24 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 891 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 301 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 13, 5:45 AM CST	Tornado Watch	SPC	Bibb, Choctaw, Clarke, Greene, Hale, Marengo and 4 more	5 hr
Jan 13, 7:15 AM CST	Severe Thunderstorm Watch	SPC	Blount, Colbert, Cullman, Fayette, Franklin, Jackson and 12 more	6 hr
Jan 13, 9:53 AM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, DeKalb, Etowah and 2 more	2 hr
Jan 13, 10:12 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 31 more	63 min
Jan 13, 10:45 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 29 more	5 hr
Jan 13, 1:13 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 6 more	2 hr

Nearby

Mesoscale Discussions in Alabama, 2005 Every mesoscale discussion in 2005

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.