Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 652

April 22, 200529 counties in Georgia; 5 counties in North Carolina; Blount County, Sevier County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 12:18 PM EDT for 29 counties in Georgia; 5 counties in North Carolina; Blount County, Sevier County, Tennessee. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 12:18 PM EDT (16:18 UTC)
Expired
Apr 22, 2005, 2:15 PM EDT
In force
117 min
Issued by
the Storm Prediction Center
All 36 counties

Banks County, GA, Bartow County, GA, Carroll County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Lumpkin County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Troup County, GA, Union County, GA, White County, GA, Cherokee County, NC, Clay County, NC, Graham County, NC, Macon County, NC, Swain County, NC, Blount County, TN, Sevier County, TN

The radar

The Atlanta radar (KFFC), 134 km from the middle of the area, began a volume at 16:19 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, 4.3 hours before the alert went out and 132 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 2005-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 342 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 2005-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 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
342 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
856 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
40 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.

000 
ACUS11 KWNS 221619
SWOMCD
SPC MCD 221618 
NCZ000-SCZ000-TNZ000-GAZ000-221815-

MESOSCALE DISCUSSION 0652
NWS STORM PREDICTION CENTER NORMAN OK
1118 AM CDT FRI APR 22 2005

AREAS AFFECTED...NWRN GA...ERN TN...WRN NC

CONCERNING...CONVECTIVE TRENDS 

VALID 221618Z - 221815Z

...THUNDERSTORMS WILL GRADUALLY INCREASE AND OVERSPREAD PORTIONS OF
NRN GA INTO WRN NC...

LEADING EDGE OF OVERNIGHT MCS APPEARS TO BE REGENERATING AS BOUNDARY
LAYER WARMS DOWNSTREAM ACROSS NRN GA INTO THE SRN PORTIONS OF THE
APPALACHIANS.  STRONGER FLOW ALOFT HAS YET TO OVERSPREAD THIS
ACTIVITY AND FORWARD PROPAGATION IS NOT PARTICULARLY FAST AT THIS
TIME.  FOR THIS REASON IT APPEARS ONLY ISOLATED STORMS EMBEDDED
ALONG THIS LEADING EDGE WILL BE CAPABLE OF PRODUCING SOME HAIL OR
PERHAPS GUSTY WINDS.  WW IS NOT ANTICIPATED.

..DARROW.. 04/22/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...GSP...MRX...FFC...

33918531 34958429 35998379 35818307 34408330 32848501

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 1:10 PM EDTSevere Thunderstorm WatchSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 66 more7 hr
Apr 22, 3:27 PM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Burke, Columbia, Crawford and 26 more93 min
Apr 22, 3:35 PM EDTSevere Thunderstorm WatchSPCQuitman6 hr
Apr 22, 5:35 PM EDTSevere Thunderstorm WatchSPCAppling, Bryan, Bulloch, Burke, Candler, Chatham and 17 more5 hr
Apr 22, 6:17 PM EDTMesoscale DiscussionSPCCatoosa, Chattooga, Fannin, Gilmer, Gordon, Murray and 4 more58 min
Apr 22, 6:40 PM EDTSevere Thunderstorm WatchSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Clayton and 17 more5 hr
Apr 22, 7:15 PM EDTSevere Thunderstorm WatchSPCAtkinson, Bacon, Baker, Ben Hill, Berrien, Brooks and 28 more6 hr
Apr 22, 7:40 PM EDTMesoscale DiscussionSPCCatoosa, Dade, Gilmer, Murray, Walker, Whitfield95 min
Apr 22, 2:35 PM EDTSevere Thunderstorm WatchSPCAlamance, Alexander, Alleghany, Ashe, Burke, Cabarrus and 25 more5 hr
Apr 21, 9:19 PM EDTMesoscale DiscussionSPCDyer, Lake, Obion86 min
Apr 21, 10:23 PM EDTMesoscale DiscussionSPCBedford, Benton, Cheatham, Davidson, Decatur, Dickson and 18 more97 min
Apr 22, 4:09 AM EDTMesoscale DiscussionSPCDyer, Lake, Obion66 min
Apr 22, 6:36 AM EDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 39 more84 min
Apr 22, 3:49 PM EDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Coffee and 27 more86 min
Apr 22, 4:35 PM EDTSevere Thunderstorm WatchSPCBedford, Benton, Cannon, Cheatham, Coffee, Davidson and 23 more5 hr

Nearby

Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in North Carolina, 2005Mesoscale Discussions in Tennessee, 2005Every mesoscale discussion in 2005

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.