Alert archive / Georgia / Special Weather Statements in 2017
Special Weather Statement, NWS Atlanta, GA
NWS Atlanta, GA issued this special weather statement at Jul 22, 2017, 2:20 PM EDT for Cobb County, Georgia. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2017, 2:20 PM EDT (18:20 UTC)
- Expired
- Jul 22, 2017, 3:00 PM EDT
- In force
- 40 min
- Issued by
- NWS Atlanta, GA
- Hail
- 0.75 in
- Wind
- 50
County Cobb County, GA
The radar
The Atlanta radar (KFFC), 55 km from the middle of the area, began a volume at 18:22 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 nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.3 hours before the alert went out and 55 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.
- Mixed-layer CAPE
- 1157 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 926 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Atlanta, GA wrote its last area forecast discussion before this special weather statement went out at Jul 22, 1:04 PM EDT, 1 hour 16 minutes earlier.
Area forecast discussion, Jul 22, 1:04 PM EDT, 1 hour 16 minutes before
Area Forecast Discussion National Weather Service Peachtree City GA 104 PM EDT Sat Jul 22 2017 .UPDATE... Updated for the 18Z Aviation Discussion. && .PREV DISCUSSION... /Issued 730 AM EDT Sat Jul 22 2017/ SHORT TERM /Today through Sunday/... The main concern for today continues to be the persistent upper ridge and hot temperatures. Little in the way of dynamics to force convection...but old boundaries from Friday and afternoon heating should be able to trigger a few showers and thunderstorms. Have broad brushed 25 to 30 percent pops for the afternoon. Thunderstorms should diminish by 06z and Sunday looks like it will be a repeat. Afternoon temperatures should range in the low to mid 90s for much of the forecast area today. Dew points were tweaked up again for today to go with persistence. Current Heat Advisory looks good except have added another row of counties on the northern side since these areas were showing HI values of above 105. Models indicate somewhat lower thickness values for Sunday...however still looking for only a slight difference in max temperatures. 41 LONG TERM /Sunday Night through Friday/... The forecast through the extended continues to be characterized by daily shower and thunderstorm opportunities. At the onset of the period on Monday, an upper shortwave and approaching cold front will serve to focus scattered convection, especially by afternoon and evening during peak daytime heating. Given a moisture rich airmass with PWATs around 2 inches, locally heavy rainfall can be expected. Furthermore, as is typical during mid summer with building afternoon instability, some strong thunderstorms will be possible. This weakening cold front will continue to linger in the area through midweek, which will enhance diurnal convection each day. By late week, the upper levels transition into a northwest flow pattern. Any disturbances riding into the area will bring additional shower and thunderstorm chances to the state with the increased potential for mesoscale convective systems arriving from the northwest. High temperatures will not stray too far from normal through the long-term period, with highs generally near 90 in north Georgia and into the lower 90s in central Georgia. Low temperatures, meanwhile, will run a few degrees above normal in the mid-70s with the exception of cooler temperatures in the mountains. RW && .AVIATION... 18Z Update... VFR conditions will continue through the forecast. Convection will be scattered today with most of the development across north GA. Cu will dissipate this evening but redevelop again and a little more numerous Sunday afternoon. Winds will be light southwest through the forecast. //ATL Confidence...18Z Update... High on all elements. 17 && .PRELIMINARY POINT TEMPS/POPS... Athens 97 74 94 74 / 30 20 40 30 Atlanta 94 75 92 74 / 30 20 40 30 Blairsville 89 69 88 68 / 30 20 50 50 Cartersville 94 73 92 73 / 30 20 40 40 Columbus 97 76 93 75 / 30 20 40 30 Gainesville 92 74 91 73 / 30 20 40 30 Macon 97 74 95 75 / 30 20 40 20 Rome 96 74 93 74 / 30 20 50 40 Peachtree City 93 73 92 73 / 30 20 40 30 Vidalia 95 74 94 75 / 30 20 40 20 && .FFC WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 6 PM EDT this evening for the following zones: Baldwin...Bibb...Bleckley...Chattahoochee...Crawford... Crisp...Dodge...Dooly...Emanuel...Harris...Houston...Jefferson... Johnson...Jones...Laurens...Macon...Marion...Monroe... Montgomery...Muscogee...Peach...Pulaski...Schley...Stewart... Sumter...Talbot...Taylor...Telfair...Toombs...Treutlen... Twiggs...Upson...Washington...Webster...Wheeler...Wilcox... Wilkinson. && SHORT TERM...17 LONG TERM....Baker AVIATION...17
Hazardous weather outlook, Jul 22, 1:05 PM EDT, 1 hour 15 minutes before
Hazardous Weather Outlook National Weather Service Peachtree City GA 105 PM EDT Sat Jul 22 2017 GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086- 089>098-102>113-231715- Baldwin-Banks-Barrow-Bartow-Bibb-Bleckley-Butts-Carroll-Catoosa- Chattahoochee-Chattooga-Cherokee-Clarke-Clayton-Cobb-Coweta- Crawford-Crisp-Dade-Dawson-DeKalb-Dodge-Dooly-Douglas-Emanuel- Fannin-Fayette-Floyd-Forsyth-Gilmer-Glascock-Gordon-Greene- Gwinnett-Hall-Hancock-Haralson-Harris-Heard-Henry-Houston-Jackson- Jasper-Jefferson-Johnson-Jones-Lamar-Laurens-Lumpkin-Macon- Madison-Marion-Meriwether-Monroe-Montgomery-Morgan-Murray- Muscogee-Newton-North Fulton-Oconee-Oglethorpe-Paulding-Peach- Pickens-Pike-Polk-Pulaski-Putnam-Rockdale-Schley-South Fulton- Spalding-Stewart-Sumter-Talbot-Taliaferro-Taylor-Telfair-Toombs- Towns-Treutlen-Troup-Twiggs-Union-Upson-Walker-Walton-Warren- Washington-Webster-Wheeler-White-Whitfield-Wilcox-Wilkes- Wilkinson- 105 PM EDT Sat Jul 22 2017 This Hazardous Weather Outlook is for portions of North and Central Georgia. .DAY ONE...This Afternoon and Tonight... Scattered showers and thunderstorms are expected across north and central Georgia this afternoon and evening. A couple of strong to severe thunderstorms will be possible. The main hazards with any storms that develop will be strong gusty winds, heavy rainfall, frequent lightning, and small hail. Additionally, heat index values will be over 100 degrees for much of north and central Georgia this afternoon and evening, with heat index values from 105 to 108 degrees expected in much of central Georgia. A Heat Advisory continues for areas along and south of a Hamilton to Forsyth to Louisville line until 6 PM. .DAYS TWO THROUGH SEVEN...Sunday through Friday... Scattered thunderstorms are possible Sunday through Friday, primarily in the afternoon and evening. Some strong to isolated severe thunderstorms are possible each day. In addition, heat index values in the 100 to 105 degree range will again be possible for much of north and central Georgia on Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not requested but spotters are encouraged to submit reports of severe weather through the web by going to weather.gov/atlanta.
In the hours before
Special weather statement, Jul 22, 2:20 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
220 PM EDT SAT JUL 22 2017
GAZ032-033-043-044-221900-
North Fulton GA-Douglas GA-Cobb GA-South Fulton GA-
220 PM EDT SAT JUL 22 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTH FULTON...NORTHEASTERN
DOUGLAS...SOUTHERN COBB AND NORTHERN SOUTH FULTON COUNTIES UNTIL 300
PM EDT...
At 219 PM EDT...a strong thunderstorm was over Jim R Miller Park,
moving southwest at 10 mph.
HAZARD...40 mph wind, pea sized hail, frequent lightning and heavy
rain.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects. Heavy rain may cause temporary
street flooding especially in poor drainage areas.
Some locations in the path of this storm include
Atlanta, Marietta, Douglasville, Smyrna, Powder Springs, Austell,
Lithia Springs, Fair Oaks, Sweetwater Creek State Park, Vinings, Jim
R Miller Park, Six Flags Over Georgia, Dobbins Air Reserve Base and
Mableton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.
LAT...LON 3397 8457 3389 8444 3371 8455 3375 8469
3386 8473 3387 8472
TIME...MOT...LOC 1819Z 037DEG 10KT 3389 8455
HAIL...0.75IN
WIND...50MPHThe office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 8:17 PM EDT | Special Weather Statement | FFC | Jones | 28 min |
| Jul 22, 2:53 PM EDT | Special Weather Statement | FFC | Paulding | 52 min |
| Jul 22, 3:48 PM EDT | Special Weather Statement | FFC | Clayton | 42 min |
| Jul 22, 3:55 PM EDT | Special Weather Statement | FFC | Heard | 50 min |
| Jul 22, 4:23 PM EDT | Special Weather Statement | FFC | Fayette | 52 min |
| Jul 22, 4:41 PM EDT | Special Weather Statement | FFC | Coweta | 49 min |
| Jul 22, 4:57 PM EDT | Special Weather Statement | FFC | Forsyth | 48 min |
| Jul 22, 5:03 PM EDT | Special Weather Statement | FFC | Butts | 42 min |
| Jul 22, 6:14 PM EDT | Special Weather Statement | FFC | Butts, Lamar, Spalding | 46 min |
| Jul 22, 6:23 PM EDT | Special Weather Statement | FFC | Lumpkin, White | 37 min |
| Jul 22, 6:52 PM EDT | Special Weather Statement | FFC | Lumpkin, White | 38 min |
| Jul 22, 6:54 PM EDT | Special Weather Statement | FFC | Pike, Spalding | 51 min |
Nearby
Special Weather Statements in Georgia, 2017Every special weather statement in 2017
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.