Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 489

April 14, 200713 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2007, 10:07 AM CDT for 13 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 4 counties in Mississippi. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2007, 10:07 AM CDT (15:07 UTC)
Expired: Apr 14, 2007, 11:00 AM CDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 30 km from the middle of the area, began a volume at 15:09 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.

Tornado Watch 141Apr 14, 10:25 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.1 hours before the alert went out and 178 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: 800 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.0

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
Apr 14, 10:26 AM CDT	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 32 more	7 hr
Apr 14, 12:24 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 10 more	66 min
Apr 14, 2:12 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 32 more	63 min
Apr 14, 3:35 PM CDT	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	7 hr
Apr 14, 5:04 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Bullock, Butler, Chambers and 26 more	56 min
Apr 14, 5:26 PM CDT	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Choctaw and 19 more	6 hr
Apr 14, 2:40 PM CDT	Mesoscale Discussion	SPC	Baker, Columbia, Franklin, Gadsden, Hamilton, Jefferson and 7 more	65 min
Apr 14, 4:53 PM CDT	Mesoscale Discussion	SPC	Nassau	97 min
Apr 13, 10:55 PM CDT	Mesoscale Discussion	SPC	Bolivar, Coahoma, Humphreys, Leflore, Quitman, Sunflower and 2 more	95 min
Apr 14, 1:34 AM CDT	Mesoscale Discussion	SPC	Adams, Carroll, Claiborne, Copiah, Franklin, Hinds and 11 more	56 min
Apr 14, 1:41 AM CDT	Tornado Watch	SPC	Adams, Claiborne, Humphreys, Issaquena, Jefferson, Sharkey and 2 more	6 hr
Apr 14, 6:17 AM CDT	Mesoscale Discussion	SPC	Amite, Attala, Claiborne, Clarke, Copiah, Covington and 27 more	88 min
Apr 14, 7:11 AM CDT	Severe Thunderstorm Watch	SPC	Amite, Attala, Carroll, Choctaw, Clarke, Clay and 34 more	6 hr

Nearby

Mesoscale Discussions in Alabama, 2007 Mesoscale Discussions in Mississippi, 2007 Mesoscale Discussions in Florida, 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.