Alert archive / Alabama / Mesoscale Discussions in 2016

Mesoscale Discussion 1835

November 28, 201613 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Nov 28, 2016, 7:00 PM CST for 13 counties in Alabama. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Nov 28, 2016, 7:00 PM CST (01:00 UTC)
Expired: Nov 28, 2016, 8:30 PM CST
In force: 90 min
Issued by: the Storm Prediction Center

Counties Bibb County, AL, Blount County, AL, Chilton County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Hale County, AL, Jefferson County, AL, Marshall County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 40 km from the middle of the area, began a volume at 01:00 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.0 hours before the alert went out and 226 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1581 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 387 m²/s²
0-3 km storm-relative helicity: 620 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 28, 6:36 PM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Monroe, Washington	2 hr
Nov 28, 8:39 PM CST	Mesoscale Discussion	SPC	Choctaw, Washington	96 min
Nov 28, 11:38 PM CST	Mesoscale Discussion	SPC	Autauga, Butler, Clarke, Dallas, Elmore, Lowndes and 5 more	3 hr
Nov 29, 3:08 PM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lamar, Lauderdale, Marion	2 hr
Nov 29, 3:48 PM CST	Tornado Watch	SPC	Colbert, Franklin, Lauderdale	7 hr
Nov 29, 4:46 PM CST	Mesoscale Discussion	SPC	Fayette, Greene, Hale, Lamar, Marion, Pickens and 2 more	2 hr
Nov 29, 5:24 PM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 5 more	96 min
Nov 29, 5:37 PM CST	Tornado Watch	SPC	Fayette, Greene, Hale, Lamar, Marion, Pickens and 4 more	3 hr

Nearby

Mesoscale Discussions in Alabama, 2016 Every mesoscale discussion in 2016

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.