Alert archive / Georgia / Mesoscale Discussions in 2007

Mesoscale Discussion 599

April 26, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2007, 4:33 PM CDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 26, 2007, 4:33 PM CDT (21:33 UTC)
Expired
Apr 26, 2007, 5:30 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 37 counties

Cherokee County, AL, DeKalb County, AL, Etowah County, AL, Jackson County, AL, Marshall County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Bradley County, TN, Franklin County, TN, Hamilton County, TN, Marion County, TN, Polk County, TN

The radar

The Northeast Alabama radar (KHTX), 108 km from the middle of the area, began a volume at 21:35 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, 9.6 hours before the alert went out and 122 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 2007-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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 12:00Z on 2007-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 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
17 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
947 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
170 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 25, 11:50 PM CDTMesoscale DiscussionSPCMobile, Washington85 min
Apr 26, 12:41 AM CDTTornado WatchSPCBaldwin, Choctaw, Clarke, Mobile, Washington7 hr
Apr 26, 4:46 AM CDTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Marengo, Mobile, Monroe and 1 more89 min
Apr 26, 7:12 AM CDTMesoscale DiscussionSPCBaldwin, Clarke, Mobile, Monroe, Washington93 min
Apr 26, 2:12 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 12 more63 min
Apr 26, 2:42 PM CDTTornado WatchSPCBarbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more3 hr
Apr 26, 4:53 PM CDTTornado WatchSPCDeKalb, Jackson, Marshall5 hr
Apr 26, 5:26 PM CDTMesoscale DiscussionSPCHenry, Houston64 min
Apr 26, 2:07 PM CDTMesoscale DiscussionSPCBledsoe, Cannon, Clay, Cumberland, DeKalb, Fentress and 18 more53 min
Apr 26, 3:18 PM CDTTornado WatchSPCAnderson, Bledsoe, Blount, Campbell, Claiborne, Clay and 24 more7 hr
Apr 26, 6:57 PM CDTMesoscale DiscussionSPCAnderson, Blount, Campbell, Claiborne, Cumberland, Grainger and 11 more93 min

Nearby

Mesoscale Discussions in Georgia, 2007Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Tennessee, 2007Every mesoscale discussion in 2007

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.