Alert archive / Alabama / Mesoscale Discussions in 2003

Mesoscale Discussion 2520

November 18, 200310 counties in Alabama; 8 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 8:58 AM CST for 10 counties in Alabama; 8 counties in Florida. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Nov 18, 2003, 8:58 AM CST (14:58 UTC)
Expired: Nov 18, 2003, 10:30 AM CST
In force: 92 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Butler County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Monroe County, AL, Bay County, FL, Escambia County, FL, Gulf County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL

The watches that followed

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

Tornado Watch 960Nov 18, 11:25 AM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.0 hours before the alert went out and 232 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: 1123 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 319 m²/s²
0-3 km storm-relative helicity: 389 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
Nov 18, 6:08 AM CST	Mesoscale Discussion	SPC	Choctaw, Colbert, Franklin, Lamar, Marion, Pickens and 1 more	2 hr
Nov 18, 6:55 AM CST	Tornado Watch	SPC	Choctaw, Colbert, Fayette, Franklin, Greene, Lamar and 9 more	5 hr
Nov 18, 10:30 AM CST	Mesoscale Discussion	SPC	Baldwin, Bibb, Blount, Butler, Chilton, Choctaw and 26 more	90 min
Nov 18, 11:25 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 38 more	6 hr
Nov 18, 1:33 PM CST	Mesoscale Discussion	SPC	DeKalb, Jackson, Madison	57 min
Nov 18, 1:55 PM CST	Tornado Watch	SPC	DeKalb, Jackson	5 hr
Nov 18, 1:59 PM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Calhoun, Chambers and 23 more	91 min
Nov 18, 4:31 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Chambers, Clay, Cleburne and 16 more	29 min
Nov 18, 4:55 PM CST	Tornado Watch	SPC	Barbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 11 more	5 hr

Nearby

Mesoscale Discussions in Alabama, 2003 Mesoscale Discussions in Florida, 2003 Every mesoscale discussion in 2003

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.