Alert archive / Alabama / Mesoscale Discussions in 2003

Mesoscale Discussion 434

April 7, 200312 counties in Alabama; 5 counties in Florida; George County, Greene County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2003, 12:07 PM CDT for 12 counties in Alabama; 5 counties in Florida; George County, Greene County, Mississippi. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2003, 12:07 PM CDT (17:07 UTC)
Expired: Apr 7, 2003, 2:00 PM CDT
In force: 113 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, George County, MS, Greene County, MS

The radar

The Mobile radar (KMOB), 98 km from the middle of the area, began a volume at 17:08 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 watches that followed

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

Severe Thunderstorm Watch 114Apr 7, 3:40 PM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.1 hours before the alert went out and 243 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: 1394 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 592 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.4

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 6, 8:13 PM CDT	Mesoscale Discussion	SPC	Bibb, Chilton, Choctaw, Dallas, Fayette, Greene and 8 more	2 hr
Apr 6, 9:48 PM CDT	Mesoscale Discussion	SPC	Autauga, Chilton, Choctaw, Clarke, Dallas, Hale and 6 more	87 min
Apr 6, 10:15 PM CDT	Tornado Watch	SPC	Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 10 more	5 hr
Apr 6, 11:39 PM CDT	Mesoscale Discussion	SPC	Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 11 more	2 hr
Apr 7, 1:51 AM CDT	Mesoscale Discussion	SPC	Bullock, Butler, Lowndes, Macon, Montgomery	54 min
Apr 7, 2:55 AM CDT	Tornado Watch	SPC	Autauga, Barbour, Bullock, Chilton, Choctaw, Dallas and 13 more	4 hr
Apr 7, 4:49 AM CDT	Mesoscale Discussion	SPC	Autauga, Chambers, Chilton, Coosa, Dallas, Elmore and 11 more	3 hr
Apr 7, 9:11 AM CDT	Mesoscale Discussion	SPC	Barbour, Coffee, Conecuh, Covington, Crenshaw, Dale and 6 more	3 hr
Apr 7, 9:40 AM CDT	Tornado Watch	SPC	Barbour, Bullock, Macon, Pike, Russell	5 hr
Apr 7, 11:25 AM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more	3 hr
Apr 7, 12:22 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more	113 min
Apr 7, 3:40 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Covington, Escambia, Mobile	5 hr
Apr 7, 5:58 PM CDT	Mesoscale Discussion	SPC	Baldwin, Escambia, Mobile	2 hr
Apr 7, 10:05 AM CDT	Severe Thunderstorm Watch	SPC	Amite, Forrest, George, Greene, Hancock, Harrison and 11 more	6 hr
Apr 7, 11:02 AM CDT	Mesoscale Discussion	SPC	Forrest, Lamar, Pearl River, Perry, Stone	3 hr
Apr 7, 2:13 PM CDT	Mesoscale Discussion	SPC	Hancock, Harrison, Pearl River, Perry, Stone	3 hr
Apr 7, 2:36 PM CDT	Mesoscale Discussion	SPC	Hancock, Harrison, Pearl River, Perry, Stone	114 min

Nearby

Mesoscale Discussions in Alabama, 2003 Mesoscale Discussions in Florida, 2003 Mesoscale Discussions in Mississippi, 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; radar from the NEXRAD Level II archive.