Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 561

April 11, 20055 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2005, 5:50 PM CDT for 5 counties in Alabama. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2005, 5:50 PM CDT (22:50 UTC)
Expired: Apr 11, 2005, 7:15 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Fayette County, AL, Franklin County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL

The radar

The Columbus AFB radar (KGWX), 24 km from the middle of the area, began a volume at 22:49 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

Little Rock, AR (KLZK), launched 12:00Z, 10.8 hours before the alert went out and 203 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: 530 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 522 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.3

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
Apr 11, 6:35 PM CDT	Tornado Watch	SPC	Mobile	4 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.