Alert archive / Alabama / Mesoscale Discussions in 2009

Mesoscale Discussion 692

May 4, 200919 counties in Alabama; 14 counties in Georgia; 10 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 4, 2009, 1:30 AM CDT for 19 counties in Alabama; 14 counties in Georgia; 10 counties in Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 4, 2009, 1:30 AM CDT (06:30 UTC)
Expired
May 4, 2009, 4:30 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 43 counties

Barbour County, AL, Bullock County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Henry County, AL, Lowndes County, AL, Macon County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Washington County, AL, Wilcox County, AL, Chattahoochee County, GA, Clay County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Muscogee County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Taylor County, GA, Terrell County, GA, Webster County, GA, Amite County, MS, Covington County, MS, Greene County, MS, Jefferson Davis County, MS, Jones County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pike County, MS, Wayne County, MS

The watches that followed

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 6.5 hours before the alert went out and 165 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, Birmingham, AL at 00:00Z on 2009-05-04Temperature 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, Birmingham, AL at 00:00Z on 2009-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 square meters per square second.19395878Sfc1 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
822 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
31 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
May 4, 2:12 AM CDTMesoscale DiscussionSPCBaldwin, Coffee, Covington, Dale, Escambia, Geneva and 2 more93 min
May 4, 2:34 AM CDTTornado WatchSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more5 hr
May 4, 4:58 AM CDTMesoscale DiscussionSPCBaldwin, Barbour, Butler, Clarke, Coffee, Conecuh and 10 more2 hr
May 4, 7:33 AM CDTTornado WatchSPCBaldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 6 more6 hr
May 4, 10:38 AM CDTMesoscale DiscussionSPCBarbour, Dale, Geneva, Henry, Houston67 min
May 4, 1:34 PM CDTMesoscale DiscussionSPCBaldwin, Coffee, Conecuh, Covington, Dale, Escambia and 2 more56 min
May 4, 3:24 PM CDTMesoscale DiscussionSPCBibb, Chilton, Choctaw, Clarke, Clay, Coosa and 7 more66 min
May 4, 12:02 PM CDTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 51 more7 hr
May 4, 1:23 PM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 47 more67 min
May 4, 1:39 PM CDTSevere Thunderstorm WatchSPCBurke, Columbia, Emanuel, Glascock, Hancock, Jefferson and 10 more5 hr
May 4, 5:15 PM CDTMesoscale DiscussionSPCBulloch, Burke, Candler, Effingham, Jenkins, Screven60 min

Nearby

Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Mississippi, 2009Every mesoscale discussion in 2009

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.