Alert archive / Georgia / Special Weather Statements in 2017

Special Weather Statement, NWS Atlanta, GA

June 17, 2017Gwinnett County, Georgia

NWS Atlanta, GA issued this special weather statement at Jun 17, 2017, 6:22 PM EDT for Gwinnett County, Georgia. It was in force for 23 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 17, 2017, 6:22 PM EDT (22:22 UTC)
Expired
Jun 17, 2017, 6:45 PM EDT
In force
23 min
Issued by
NWS Atlanta, GA
Wind
40

County Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 79 km from the middle of the area, began a volume at 22:24 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, 10.4 hours before the alert went out and 76 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 2017-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 242 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 2017-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
242 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
886 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
13 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 17, 3:49 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Jun 17, 3:49 PM EDT, 2 hours 33 minutes before
Area Forecast Discussion
National Weather Service Peachtree City GA
349 PM EDT Sat Jun 17 2017

.SHORT TERM /Tonight through Sunday Night/...
Weak upper trough lingers over the northern Gulf area this
afternoon. Water vapor curve showing a bit drier air lingering over
parts of Ga...however afternoon heating has helped to produce widely
scattered showers and thunderstorms. No real trigger for the
convection...so development anywhere is possible. Have gradually
diminished pops tonight...no pops after 06z but a few storms could
linger late.  Models showing an increase in moisture from the
southwest late tonight and this may make for some early morning
clouds. Otherwise Sunday looks like another day with diurnal
convection. A frontal boundary drifts southward into TN overnight
Sunday and have increased pops into likely for the far north Sunday
night...with chance or slight chance elsewhere.

Mav/Met temperatures look reasonable and have stayed close.

41

.LONG TERM /Monday through Saturday/...
No changes made to the extended forecast with a generally weak,
summertime pattern continuing. Medium range models still in
pretty good agreement through the beginning of next week. A weak
cold front approaches Sunday night and sags into the forecast area
Monday. Broad upper- level trough dominates the eastern U.S., but
more significant upper dynamics remain well north of the forecast
area. Surface front is also not especially distinct providing
only weak surface forcing. This is still enough to produce a good
coverage of convection, mainly across the north late Sunday
through Monday, shifting into central Georgia Tuesday. Weak
dynamics, minimal shear and general lack of strong instability
points to a minimal threat for severe thunderstorms at this time.

After Tuesday the extended forecast period becomes a lot less clear.
Medium range models show a wide spread in the evolution of the
potential tropical system in the Gulf of Mexico. GFS has trended
toward the more northern solution, but keeps the system relatively
weak while the ECMWF continues to resolve a much weaker low heading
west across the Bay of Campeche toward eastern Mexico. With this
uncertainty, I have elected to keep the forecast for the latter half
of the week somewhat conservative for now, basically continuing the
pattern of scattered diurnal convection and near normal temperatures.

01

&&

.AVIATION...
18Z UPDATE...

Pretty typical summertime pattern to continue for the area and
associated terminals for the next 24 to 36 hours. Thunderstorms
were developing and may affect the taf sites so have included
tempo at all locations. Stratus possible late tonight but have
only gone for SCT for now as not very confident with this.
Winds varying around south...but have continued with a direction
favoring the west side.

//ATL CONFIDENCE...18Z UPDATE...

Medium on wind and morning stratus.
High on all other elements.

41

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          69  88  71  87 /  30  20  30  50
Atlanta         70  87  72  86 /  30  40  30  50
Blairsville     65  80  66  80 /  40  40  50  60
Cartersville    69  87  71  86 /  30  30  40  60
Columbus        72  90  73  88 /  40  30  20  50
Gainesville     69  87  70  85 /  30  30  40  60
Macon           70  91  72  88 /  30  20  20  50
Rome            69  88  71  86 /  20  30  50  60
Peachtree City  69  88  70  86 /  30  30  30  50
Vidalia         73  92  74  89 /  30  20  20  50

&&

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

SHORT TERM...41
LONG TERM....01
AVIATION...41
Hazardous weather outlook, Jun 17, 5:04 PM EDT, 1 hour 18 minutes before
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In the hours before

Special weather statement, Jun 17, 4:24 PM EDT, 1 hour 58 minutes before
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Special weather statement, Jun 17, 4:47 PM EDT, 1 hour 35 minutes before
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Local storm report, Jun 17, 5:46 PM EDT, 36 minutes before
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Local storm report, Jun 17, 5:50 PM EDT, 32 minutes before
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Special weather statement, Jun 17, 6:16 PM EDT, 6 minutes before
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Special weather statement, Jun 17, 6:22 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 17, 3:12 PM EDTSpecial Weather StatementFFCBleckley33 min
Jun 17, 3:36 PM EDTSpecial Weather StatementFFCLaurens39 min
Jun 17, 4:00 PM EDTSevere Thunderstorm WarningFFCLaurens45 min
Jun 17, 4:24 PM EDTSpecial Weather StatementFFCTroup36 min
Jun 17, 4:47 PM EDTSpecial Weather StatementFFCPutnam28 min
Jun 17, 6:16 PM EDTSpecial Weather StatementFFCJones29 min
Jun 17, 7:18 PM EDTSpecial Weather StatementFFCCarroll, Douglas42 min
Jun 17, 7:24 PM EDTSpecial Weather StatementFFCHall36 min
Jun 17, 7:32 PM EDTSevere Thunderstorm WarningFFCEmanuel, Montgomery, Treutlen43 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.