Alert archive / Georgia / Special Weather Statements in 2018

Special Weather Statement, NWS Atlanta, GA

June 21, 2018Coweta County, Georgia

NWS Atlanta, GA issued this special weather statement at Jun 21, 2018, 3:34 PM EDT for Coweta County, Georgia. It was in force for 26 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
Jun 21, 2018, 3:34 PM EDT (19:34 UTC)
Expired
Jun 21, 2018, 4:00 PM EDT
In force
26 min
Issued by
NWS Atlanta, GA
Wind
40

County Coweta County, GA

The radar

The Atlanta radar (KFFC), 27 km from the middle of the area, began a volume at 19:35 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 nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.6 hours before the alert went out and 32 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 2018-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 354 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 2018-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
354 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
1180 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

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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 Jun 21, 3:30 PM EDT, 4 minutes earlier.

Area forecast discussion, Jun 21, 3:30 PM EDT, 4 minutes before
Area Forecast Discussion
National Weather Service Peachtree City GA
330 PM EDT Thu Jun 21 2018

.SHORT TERM /Tonight through Friday Night/...

The closed upper low west of the MS River should drift southeast
into the OH Valley during the short term. This will keep GA in a
broad trough with southwest winds bringing Gulf moisture across the
area. Weak short waves will rotate through the trough and support
the development of showers and thunderstorms. The convection will be
enhanced by diurnal heating but expect some storms to linger
overnight...mainly north and west. Moderate instability this
afternoon and Friday afternoon could support a few strong storms
with damaging winds and heavy rain. Otherwise not as hot mainly
north and west due to more clouds...but much of central GA will
still reach into the low and mid 90s with overall fewer clouds and
lower chances for thunderstorms.

41

.LONG TERM /Saturday through Thursday/...

Only tweaks to the long term based on the latest guidance.

BDL

PREVIOUS DISCUSSION...

Unsettled period remains in place for the extended period.
Aforementioned parent low will continue to lift northeastward into
the weekend, and with it the best rain chances. As zonal flow sets
up over the region it its wake, lingering surface moisture and
disturbances aloft will keep shower and thunderstorms chances over
the area Saturday. Riding aloft will build back into the area
Sunday and into early next week, but with moisture remaining
trapped under the high, diurnal convection is still expected each
day through the extended.

Temperatures remain warm through the weekend and into next week.
Increased cloud cover and precip activity could assist in keeping
temperatures a few degrees lower Saturday. With dewpoints in the
70s and above normal temperatures, heat index values will creep
into the lower 100s several days, particularly over portions of
central and eastern Georgia. Although sub-criteria those spending
prolonged periods outdoors should take frequent breaks and drink
plenty of water.

31

&&

.AVIATION...
18Z Update...

Ceilings should be vfr this afternoon...ranging from BKN040-050 and
then scattering this evening. Expect some mvfr ceilings to form
toward sunrise and then gradually lift during the morning. Showers
and thunderstorms will be more widespread this afternoon and evening
and have added a tempo to all taf sites. Winds will remain on the
west side. Think Friday will be mostly a repeat of today.

//ATL Confidence...18Z Update...
Medium on ceiling trends.
Medium to high on all else.

41

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          71  89  70  89 /  70  60  40  50
Atlanta         72  88  72  88 /  60  60  50  50
Blairsville     66  81  64  83 /  70  60  60  50
Cartersville    70  87  69  87 /  70  60  50  50
Columbus        74  91  74  92 /  50  50  20  50
Gainesville     70  86  69  86 /  70  60  50  50
Macon           74  92  73  92 /  50  50  20  50
Rome            71  87  69  88 /  70  60  50  50
Peachtree City  72  88  71  88 /  60  50  40  50
Vidalia         76  93  75  94 /  30  30  20  30

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...41
LONG TERM....BDL
AVIATION...41
Hazardous weather outlook, Jun 21, 3:11 PM EDT, 23 minutes before
Hazardous Weather Outlook
National Weather Service Peachtree City GA
311 PM EDT Thu Jun 21 2018

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-221915-
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-
311 PM EDT Thu Jun 21 2018

This Hazardous Weather Outlook is for portions of North and Central Georgia.

.DAY ONE...This Afternoon and Tonight...

Scattered to numerous thunderstorms are expected this afternoon
into tonight, most so over north Georgia. A few storms
could be strong to severe with the main hazards being strong
gusty winds, frequent lightning and isolated flooding from
heavy rainfall.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

There is a chance of thunderstorms everyday for the next week,
mainly during the afternoon and evening hours. A few storms
could be strong to severe each day with gusty winds, frequent
lightning and isolated flooding from heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight, but spotters
are encouraged to submit reports of any severe weather and flooding
through the web by going to weather.gov/atlanta

In the hours before

Special weather statement, Jun 21, 2:27 PM EDT, 1 hour 7 minutes before
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Special weather statement, Jun 21, 3:34 PM EDT, 0 minutes before
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The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 9:05 PM EDTSpecial Weather StatementFFCToombs25 min
Jun 21, 2:27 PM EDTSpecial Weather StatementFFCMadison33 min
Jun 21, 2:31 PM EDTSevere Thunderstorm WarningFFCMadison, Oglethorpe29 min
Jun 21, 3:38 PM EDTSpecial Weather StatementFFCGwinnett37 min
Jun 21, 3:57 PM EDTSpecial Weather StatementFFCMorgan, Newton33 min
Jun 21, 4:04 PM EDTSpecial Weather StatementFFCFayette26 min
Jun 21, 4:46 PM EDTSpecial Weather StatementFFCMadison14 min
Jun 21, 5:43 PM EDTSpecial Weather StatementFFCTalbot32 min
Jun 21, 7:01 PM EDTSpecial Weather StatementFFCGlascock14 min

Nearby

Special Weather Statements in Georgia, 2018Every special weather statement in 2018

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.