Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 253

February 17, 200814 counties in Alabama; Escambia County, Santa Rosa County, Florida; 9 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 17, 2008, 5:05 AM CST for 14 counties in Alabama; Escambia County, Santa Rosa County, Florida; 9 counties in Mississippi. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Feb 17, 2008, 5:05 AM CST (11:05 UTC)
Expired
Feb 17, 2008, 6:00 AM CST
In force
55 min
Issued by
the Storm Prediction Center
All 25 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Hale County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Clarke County, MS, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS, Lauderdale County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 39 km from the middle of the area, began a volume at 11:08 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.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.1 hours before the alert went out and 183 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2008-02-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2008-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1066 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
292 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.

IssuedProductOfficeCountiesLasted
Feb 17, 2:13 AM CSTMesoscale DiscussionSPCMobile32 min
Feb 17, 4:19 AM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Marion, Pickens56 min
Feb 17, 5:26 AM CSTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 14 more7 hr
Feb 17, 7:13 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 16 more62 min
Feb 17, 9:43 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 17 more62 min
Feb 17, 12:14 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Chambers, Clay, Coffee and 16 more91 min
Feb 17, 12:32 PM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 28 more7 hr
Feb 17, 2:45 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 22 more90 min
Feb 17, 5:19 PM CSTMesoscale DiscussionSPCChambers, Dale, Geneva, Henry, Houston86 min
Feb 17, 5:58 PM CSTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 6 more8 hr
Feb 16, 10:41 PM CSTMesoscale DiscussionSPCAdams, Issaquena, Washington94 min
Feb 16, 11:30 PM CSTSevere Thunderstorm WatchSPCAdams, Amite, Attala, Bolivar, Carroll, Claiborne and 25 more6 hr
Feb 17, 2:45 AM CSTTornado WatchSPCAmite, Claiborne, Clarke, Copiah, Covington, Forrest and 23 more5 hr

Nearby

Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in Mississippi, 2008Mesoscale Discussions in Florida, 2008Every mesoscale discussion in 2008

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.