Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 133

February 18, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Feb 18, 2009, 10:55 PM CST for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Feb 18, 2009, 10:55 PM CST (04:55 UTC)
Expired
Feb 19, 2009, 12:30 AM CST
In force
95 min
Issued by
the Storm Prediction Center
All 136 counties

Barbour County, AL, Bullock County, AL, Butler County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Pike County, AL, Russell County, AL, Bay County, FL, Calhoun County, FL, Gadsden County, FL, Hamilton County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Baldwin County, GA, Ben Hill County, GA, Berrien County, GA, Bibb County, GA, Bleckley County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Calhoun County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Chattahoochee County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Grady County, GA, Hancock County, GA, Harris County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, Macon County, GA, Marion County, GA, McIntosh County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Montgomery County, GA, Muscogee County, GA, Peach County, GA, Pierce County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Richmond County, GA, Schley County, GA, Screven County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Tattnall County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Ware County, GA, Washington County, GA, Wayne County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Orangeburg County, SC, Williamsburg County, SC

The radar

The Robins AFB radar (KJGX), 65 km from the middle of the area, began a volume at 04:56 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.9 hours before the alert went out and 194 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, Peachtre/Fal Fld, GA at 00:00Z on 2009-02-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 185 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, Peachtre/Fal Fld, GA at 00:00Z on 2009-02-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 479 square meters per square second.1939587897117136Sfc1 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
185 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
831 m above ground
0-6 km bulk shear
94 kt
0-1 km storm-relative helicity
479 m²/s²
0-3 km storm-relative helicity
475 m²/s²
Significant tornado parameter
0.6
Supercell composite
2.4

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.

IssuedProductOfficeCountiesLasted
Feb 18, 7:14 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Butler, Calhoun, Chambers and 27 more61 min
Feb 18, 7:42 PM CSTSevere Thunderstorm WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 31 more5 hr
Feb 18, 7:58 PM CSTMesoscale DiscussionSPCBarbour, Henry, Lee, Russell92 min
Feb 18, 9:14 PM CSTSevere Thunderstorm WatchSPCCoffee, Dale, Geneva, Henry, Houston6 hr
Feb 19, 12:41 AM CSTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 17 more49 min
Feb 19, 12:58 AM CSTTornado WatchSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 23 more7 hr
Feb 19, 3:19 AM CSTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Clay, Columbia and 18 more56 min
Feb 19, 6:06 AM CSTMesoscale DiscussionSPCAlachua, Bradford, Clay, Dixie, Gilchrist, Putnam and 1 more54 min
Feb 18, 7:02 PM CSTSevere Thunderstorm WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more7 hr
Feb 18, 11:38 PM CSTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Brantley, Camden, Charlton and 8 more81 min
Feb 19, 1:20 AM CSTMesoscale DiscussionSPCBryan, Bulloch, Candler, Chatham, Crisp, Dodge and 13 more25 min
Feb 19, 1:44 AM CSTTornado WatchSPCBryan, Chatham, Evans, Liberty, Long, McIntosh and 1 more3 hr

Nearby

Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in South Carolina, 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.