Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 2247

December 20, 20075 counties in Alabama; Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 20, 2007, 1:03 PM CST for 5 counties in Alabama; Jackson County, Mississippi. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Dec 20, 2007, 1:03 PM CST (19:03 UTC)
Expired: Dec 20, 2007, 2:00 PM CST
In force: 57 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Conecuh County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Jackson County, MS

The radar

The Mobile radar (KMOB), 51 km from the middle of the area, began a volume at 19:04 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.1 hours before the alert went out and 199 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: 178 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 781 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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
Dec 20, 10:01 AM CST	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	5 hr
Dec 20, 11:21 AM CST	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	84 min
Dec 20, 11:50 AM CST	Tornado Watch	SPC	Butler, Conecuh, Covington, Escambia, Monroe	5 hr
Dec 20, 8:48 AM CST	Mesoscale Discussion	SPC	Amite, Pike, Wilkinson	57 min
Dec 20, 9:15 AM CST	Tornado Watch	SPC	Amite, Hancock, Harrison, Jackson, Pearl River, Pike and 2 more	7 hr
Dec 20, 1:06 PM CST	Mesoscale Discussion	SPC	Amite, Hancock, Harrison, Jackson, Pearl River, Pike and 2 more	84 min

Nearby

Mesoscale Discussions in Alabama, 2007 Mesoscale Discussions in Mississippi, 2007 Every mesoscale discussion in 2007

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.