Alert archive / Alabama / Mesoscale Discussions in 2009

Mesoscale Discussion 167

February 27, 200928 counties in Alabama; 14 counties in Georgia; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 27, 2009, 5:29 PM CST for 28 counties in Alabama; 14 counties in Georgia; 5 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Feb 27, 2009, 5:29 PM CST (23:29 UTC)
Expired
Feb 27, 2009, 7:30 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 47 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Coffee County, AL, Coosa County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Henry County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Russell County, AL, Sumter County, AL, Tallapoosa County, AL, Wilcox County, AL, Baker County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Dougherty County, GA, Early County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Stewart County, GA, Terrell County, GA, Webster County, GA, Kemper County, MS, Lauderdale County, MS, Noxubee County, MS, Oktibbeha County, MS, Winston County, MS

The radar

The Birmingham radar (KBMX), 98 km from the middle of the area, began a volume at 23:30 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

Birmingham, AL (KBMX), launched 12:00Z, 11.5 hours before the alert went out and 98 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 12:00Z on 2009-02-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2009-02-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 398 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
622 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
398 m²/s²
0-3 km storm-relative helicity
400 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 27, 8:29 AM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Cullman, Fayette, Greene and 12 more31 min
Feb 27, 8:40 AM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Chilton, Dallas, Fayette, Greene and 11 more6 hr
Feb 27, 10:15 AM CSTMesoscale DiscussionSPCGreene, Pickens, Sumter90 min
Feb 27, 12:16 PM CSTMesoscale DiscussionSPCSumter89 min
Feb 27, 12:38 PM CSTTornado WatchSPCAutauga, Barbour, Bibb, Bullock, Chilton, Choctaw and 20 more7 hr
Feb 27, 2:04 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Crenshaw, Lee, Macon, Montgomery and 2 more56 min
Feb 27, 3:38 PM CSTMesoscale DiscussionSPCGreene, Hale, Perry, Sumter97 min
Feb 26, 9:09 PM CSTMesoscale DiscussionSPCBenton, Coahoma, DeSoto, Marshall, Panola, Quitman and 3 more96 min
Feb 26, 9:40 PM CSTSevere Thunderstorm WatchSPCCoahoma, DeSoto, Tunica5 hr
Feb 27, 1:45 AM CSTMesoscale DiscussionSPCTunica30 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; radar from the NEXRAD Level II archive.