Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 45

January 7, 200520 counties in Alabama; Greene County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 7, 2005, 11:44 PM CST for 20 counties in Alabama; Greene County, Mississippi. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jan 7, 2005, 11:44 PM CST (05:44 UTC)
Expired: Jan 8, 2005, 1:15 AM CST
In force: 91 min
Issued by: the Storm Prediction Center

All 21 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Chilton County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Monroe County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Washington County, AL, Wilcox County, AL, Greene County, MS

The radar

The Birmingham radar (KBMX), 123 km from the middle of the area, began a volume at 05:45 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, 5.7 hours before the alert went out and 123 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: 45 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 588 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 323 m²/s²
0-3 km storm-relative helicity: 358 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 7, 8:34 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Chilton, Choctaw, Clarke and 14 more	26 min
Jan 7, 8:45 PM CST	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 19 more	5 hr

Nearby

Mesoscale Discussions in Alabama, 2005 Mesoscale Discussions in Mississippi, 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.