Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 437

April 10, 200938 counties in Georgia; 17 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2009, 6:11 PM EDT for 38 counties in Georgia; 17 counties in South Carolina. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2009, 6:11 PM EDT (22:11 UTC)
Expired
Apr 10, 2009, 7:15 PM EDT
In force
64 min
Issued by
the Storm Prediction Center
All 55 counties

Baldwin County, GA, Bibb County, GA, Butts County, GA, Clarke County, GA, Columbia County, GA, Crawford County, GA, Elbert County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Hart County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Putnam County, GA, Richmond County, GA, Stephens County, GA, Taliaferro County, GA, Twiggs County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 111 km from the middle of the area, began a volume at 22:11 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 12:00Z, 10.2 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, Peachtre/Fal Fld, GA at 12:00Z on 2009-04-10Temperature 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, Peachtre/Fal Fld, GA at 12:00Z on 2009-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 256 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
671 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
256 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
Apr 10, 5:25 AM EDTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 6 more95 min
Apr 10, 8:04 AM EDTMesoscale DiscussionSPCBanks, Bartow, Chattooga, Cherokee, Cobb, Dawson and 23 more86 min
Apr 10, 12:23 PM EDTTornado Watch PDSSPCCatoosa, Chattooga, Dade, Walker, Whitfield8 hr
Apr 10, 3:29 PM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Butts, Carroll, Cherokee and 36 more91 min
Apr 10, 3:39 PM EDTTornado Watch PDSSPCBanks, Barrow, Bartow, Carroll, Cherokee, Clarke and 36 more8 hr
Apr 10, 4:43 PM EDTMesoscale DiscussionSPCBartow, Carroll, Chattooga, Cherokee, Cobb, Dawson and 13 more92 min
Apr 10, 6:31 PM EDTTornado WatchSPCBaldwin, Bibb, Bleckley, Butts, Chattahoochee, Columbia and 53 more7 hr
Apr 10, 7:34 PM EDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Bibb, Butts and 60 more56 min

Nearby

Mesoscale Discussions in Georgia, 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.