Alert archive / Georgia / Special Weather Statements in 2017

Special Weather Statement, NWS Atlanta, GA

July 21, 2017Webster County, Georgia

NWS Atlanta, GA issued this special weather statement at Jul 21, 2017, 6:53 PM EDT for Webster County, Georgia. It was in force for 37 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 21, 2017, 6:53 PM EDT (22:53 UTC)
Expired
Jul 21, 2017, 7:30 PM EDT
In force
37 min
Issued by
NWS Atlanta, GA
Wind
40

County Webster County, GA

The radar

The Robins AFB radar (KJGX), 120 km from the middle of the area, began a volume at 22:53 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, 10.9 hours before the alert went out and 139 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 2017-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 843 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 2017-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
843 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 Jul 21, 3:19 PM EDT, 3 hours 34 minutes earlier.

Area forecast discussion, Jul 21, 3:19 PM EDT, 3 hours 34 minutes before
Area Forecast Discussion
National Weather Service Peachtree City GA
319 PM EDT Fri Jul 21 2017

.SHORT TERM /Tonight through Saturday Night/...

The upper low that was over north Florida/South Georgia is forecast
to fill tonight leaving a weak ridge of high pressure over the
Tennessee Valley. The ridge of high pressure is not strong enough to
suppress completely the diurnal convection across the CWA this
afternoon. The ridge will remain in place Saturday with a weak
trough of low pressure across central/south Georgia. A little more
Gulf moisture will move into the forecast area Saturday with
southwest winds and this will create a more scattered nature to the
thunderstorms than isolated and have therefore keep chance pops
going across north and parts of central GA.

The big story continues to be the heat. MOS Guidance temperatures
have been running a degree or two too cool for max temps across much
of the area and have made adjustments to max temps for Saturday
which is pretty close to persistence. Adding slightly higher
dewpoints Saturday will produce heat index values of 105 to 108
across parts of central Georgia. Have therefore issued a Heat
Advisory for areas along and south of a Columbus to Macon to
Louisville line for Saturday afternoon.

17

&&

.LONG TERM /Sunday through Friday/...

Guidance still in line for more active pattern and scattered to
numerous convection each day given moist/unstable regime. Still
looking to have some forcing mechanisms beyond the diurnal
component in the form of an early week front approaching the area
Monday, stalling into midweek, and then late week transition to
more NW flow aloft, which would make the area more susceptible to
shortwave impulses and possibly some rounds of more organized
storms to the north. Have raised some late week pops accordingly.
Otherwise forecast on track and did refresh of overall model
blend. Previous discussion follows...

Baker

PREV DISCUSSION... /Issued 730 AM EDT Fri Jul 21 2017/

LONG TERM /Saturday Night through Thursday/...

The extended period will be characterized by increasing rain chances
as the upper trough pushes into the eastern US from Sunday into
early next week. This upper level troughing in concert with abundant
moisture will bring largely diurnal showers and thunderstorms each
afternoon. Additionally, a weak cold front will be pushed southward
into the region by Monday in to Tuesday which will serve as a
further focus for convective development. This boundary will linger
into midweek, so climatologically typical diurnal showers and
thunderstorms will be the rule during this time frame. As is also
typical for late July in Georgia, some thunderstorms may become
strong during the afternoon and evening hours during the hours of
peak instability.

One positive aspect of the increased rain chances will be increased
cloud cover which will bring lower afternoon high temperatures as
compared to the last few days. Nonetheless, with dewpoints
remaining in the 70s, it will still feel warm and muggy.

RW

&&

.AVIATION...
18Z Update...
No major changes from the previous forecast. Afternoon cu has
developed and this will persist through the afternoon, dissipating
tonight and redeveloping Saturday morning. Isolated to scattered
shra/tsra will develop this afternoon and early evening,
dissipating tonight and developing late Saturday morning into the
afternoon. Winds will be light southwest through the forecast.

//ATL Confidence...18Z Update...
High on all elements.

17

&&

.CLIMATE...

Records for 07-21

               Max Temperature         Min Temperature
  Station      High        Low         High        Low
  -------  ----------  ----------  ----------  ----------
   KAHN     108 1926     78 1938     76 1993     60 1929
                                        1926
   KATL     102 1986     76 1920     80 1881     61 1929
                            1899
   KCSG     103 1942     80 2014     78 2015     61 2009
                                        1996
                                        1986
   KMCN     106 1986     78 1929     78 2015     64 1910
                                        1954
                                        1934

Records for 07-22

               Max Temperature         Min Temperature
  Station      High        Low         High        Low
  -------  ----------  ----------  ----------  ----------
   KAHN     103 1932     72 1970     76 1930     58 1947
   KATL     102 1993     75 1970     80 1881     59 1947
   KCSG     102 1943     80 1970     79 1934     61 1922
   KMCN     102 1983     81 1913     79 1983     61 1947
                1977

Records for 07-23

               Max Temperature         Min Temperature
  Station      High        Low         High        Low
  -------  ----------  ----------  ----------  ----------
   KAHN     104 1924     73 1904     79 1983     60 1966
   KATL     100 1952     76 1890     78 1943     60 1947
   KCSG     103 1952     79 1913     80 1983     63 1947
                1943
   KMCN     102 1987     75 1919     79 1983     62 1966
                1952                                1947
                1907

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          73  96  73  93 /  20  30  20  40
Atlanta         76  94  76  91 /  20  30  20  50
Blairsville     69  89  69  86 /  20  40  30  50
Cartersville    72  93  72  91 /  20  30  20  50
Columbus        77  96  77  92 /  20  30  20  40
Gainesville     73  93  73  90 /  20  30  20  50
Macon           73  97  73  93 /  20  20  20  40
Rome            73  94  73  92 /  20  30  20  50
Peachtree City  73  93  73  91 /  20  30  20  40
Vidalia         74  95  74  93 /  20  20  20  30

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from noon to 6 PM EDT Saturday for the following
zones: Bibb...Bleckley...Chattahoochee...Crawford...Crisp...
Dodge...Dooly...Emanuel...Houston...Jefferson...Johnson...
Laurens...Macon...Marion...Montgomery...Muscogee...Peach...
Pulaski...Schley...Stewart...Sumter...Talbot...Taylor...
Telfair...Toombs...Treutlen...Twiggs...Washington...Webster...
Wheeler...Wilcox...Wilkinson.

&&

SHORT TERM...17
LONG TERM....RW/Baker
AVIATION...17
Hazardous weather outlook, Jul 21, 3:33 PM EDT, 3 hours 20 minutes before
Hazardous Weather Outlook
National Weather Service Peachtree City GA
333 PM EDT Fri Jul 21 2017

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-221945-
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-
333 PM EDT Fri Jul 21 2017

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

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

Isolated 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 near 105 for portions of central Georgia.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Heat index values across portions of central Georgia are expected
to reach 105-108 degrees Saturday afternoon. A Heat Advisory has
been issued along and south of a Columbus, to Macon, to Louisville
line.

Isolated to scattered thunderstorms are possible Saturday through
Thursday, primarily in the afternoon and evening. Some strong to
isolated severe are possible each day.

.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 21, 6:11 PM EDT, 42 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
611 PM EDT FRI JUL 21 2017

GAZ113-212300-
Toombs GA-
611 PM EDT FRI JUL 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN TOOMBS COUNTY UNTIL 700
PM EDT...

At 611 PM EDT...a strong thunderstorm was over English Eddy, or over
Plant Hatch...moving northwest at 10 mph.

  HAZARD...Frequent lightning and heavy rain.

  IMPACT...Lightning is one of nature's leading killers. If you can
           hear thunder...you are close enough to be struck by
           lightning. Heavy rain may cause temporary street flooding
           especially in poor drainage areas.

Some locations in the path of this storm include
Lyons, Santa Claus, South Thompson, English Eddy, Toombs Central, New
Branch, Cedar Crossing, Johnson Corner, McNatt Falls and Grays
Landing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately.  Electrical
appliances should not be used unless in an emergency. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3192 8223 3191 8225 3193 8226 3194 8228
      3193 8230 3195 8231 3193 8231 3194 8238
      3196 8238 3195 8239 3196 8240 3195 8240
      3197 8243 3196 8246 3197 8248 3221 8230
      3215 8219 3191 8223
TIME...MOT...LOC 2211Z 115DEG 7KT 3195 8235
Special weather statement, Jul 21, 6:14 PM EDT, 39 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
614 PM EDT FRI JUL 21 2017

GAZ102-103-212245-
Stewart GA-Webster GA-
614 PM EDT FRI JUL 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN STEWART AND SOUTHWESTERN
WEBSTER COUNTIES UNTIL 645 PM EDT...

At 613 PM EDT...a line of strong thunderstorms was along a line
extending from near Union to near Weston. These storms were nearly
stationary.

  HAZARD...Up to 40 mph wind...frequent cloud to ground 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 these storms include
Lumpkin, Preston, Richland, Weston, Troutman, Kimbrough, Sanford,
Westville, Centerpoint, Leveretts, Providence Canyon State Park and
Chambliss.

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 3192 8467 3193 8468 3192 8469 3192 8480
      3193 8480 3192 8481 3192 8491 3193 8492
      3193 8493 3195 8496 3197 8495 3198 8497
      3207 8497 3211 8455 3192 8451
TIME...MOT...LOC 2213Z 154DEG 0KT 3193 8490 3202 8458

WIND...40MPH
Special weather statement, Jul 21, 6:15 PM EDT, 38 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
615 PM EDT FRI JUL 21 2017

GAZ108-212245-
Wilcox GA-
615 PM EDT FRI JUL 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN WILCOX COUNTY UNTIL
645 PM EDT...

At 615 PM EDT...a line of strong thunderstorms was along a line
extending from Pleasant View to near Owensboro...and moving west at
20 mph.

  HAZARD...Up to 40 mph wind...frequent cloud to ground 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 these storms include
Rochelle, Pitts, Double Run, Owensboro, Pleasant View and Seville.

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 3185 8361 3209 8361 3207 8353 3185 8334
TIME...MOT...LOC 2215Z 102DEG 19KT 3205 8359 3183 8339

WIND...40MPH
Special weather statement, Jul 21, 6:25 PM EDT, 28 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
625 PM EDT FRI JUL 21 2017

GAZ105-106-212300-
Crisp GA-Dooly GA-
625 PM EDT FRI JUL 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CRISP AND
SOUTHEASTERN DOOLY COUNTIES UNTIL 700 PM EDT...

At 624 PM EDT...a line of strong thunderstorms was along a line
extending from Pleasant View to near Arp...and moving west at 15 mph.

  HAZARD...Up to 40 mph wind...frequent cloud to ground 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 these storms include
Vienna, East Crisp, Tremont and Hatley.

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 3212 8380 3209 8361 3180 8361
TIME...MOT...LOC 2224Z 095DEG 13KT 3205 8360 3180 8342

WIND...40MPH
Special weather statement, Jul 21, 6:49 PM EDT, 4 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
649 PM EDT FRI JUL 21 2017

GAZ093-095-105-212315-
Macon GA-Dooly GA-Houston GA-
649 PM EDT FRI JUL 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MACON...NORTHEASTERN
DOOLY AND SOUTHWESTERN HOUSTON COUNTIES UNTIL 715 PM EDT...

At 649 PM EDT...a line of strong thunderstorms was along a line
extending from near Unadilla to near Henderson to Dooling. These
storms were nearly stationary.

  HAZARD...Up to 40 mph wind...frequent cloud to ground 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 these storms include
Unadilla and Henderson.

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 3223 8369 3227 8383 3223 8391 3225 8395
      3241 8389 3235 8373
TIME...MOT...LOC 2249Z 354DEG 3KT 3230 8376 3234 8386 3224 8391

WIND...40MPH
Special weather statement, Jul 21, 6:53 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
653 PM EDT FRI JUL 21 2017

GAZ091-092-103-104-212330-
Schley GA-Sumter GA-Marion GA-Webster GA-
653 PM EDT FRI JUL 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SCHLEY...NORTHWESTERN
SUMTER...SOUTHEASTERN MARION AND WEBSTER COUNTIES UNTIL 730 PM EDT...

At 653 PM EDT...a line of strong thunderstorms was along a line
extending from near La Crosse to Dumas. These storms were nearly
stationary.

  HAZARD...Up to 40 mph wind...frequent cloud to ground 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 these storms include
Ellaville, Preston, Plains, Friendship, La Crosse, Centerpoint and
Dumas.

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 3210 8461 3230 8423 3214 8422 3195 8454
TIME...MOT...LOC 2253Z 176DEG 4KT 3216 8427 3205 8447

WIND...40MPH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 10:46 PM EDTSpecial Weather StatementFFCJefferson29 min
Jul 20, 11:04 PM EDTSevere Thunderstorm WarningFFCJefferson26 min
Jul 20, 11:29 PM EDTSpecial Weather StatementFFCRichmond31 min
Jul 21, 2:02 PM EDTSpecial Weather StatementFFCMarion28 min
Jul 21, 2:30 PM EDTSpecial Weather StatementFFCTowns30 min
Jul 21, 2:44 PM EDTHeat AdvisoryFFCBaldwin, Bibb, Bleckley, Chattahoochee, Crawford, Crisp and 31 more27 hr
Jul 21, 3:29 PM EDTSpecial Weather StatementFFCMontgomery, Wheeler31 min
Jul 21, 3:43 PM EDTSpecial Weather StatementFFCTelfair32 min
Jul 21, 3:51 PM EDTSpecial Weather StatementFFCEmanuel39 min
Jul 21, 3:53 PM EDTSpecial Weather StatementFFCUnion37 min
Jul 21, 3:57 PM EDTSpecial Weather StatementFFCWheeler33 min
Jul 21, 4:00 PM EDTSpecial Weather StatementFFCDodge45 min
Jul 21, 4:24 PM EDTSpecial Weather StatementFFCPickens36 min
Jul 21, 4:26 PM EDTSpecial Weather StatementFFCLumpkin34 min
Jul 21, 5:58 PM EDTSpecial Weather StatementFFCMacon32 min
Jul 21, 6:03 PM EDTSpecial Weather StatementFFCCrisp27 min
Jul 21, 6:11 PM EDTSpecial Weather StatementFFCToombs49 min
Jul 21, 6:14 PM EDTSpecial Weather StatementFFCStewart, Webster31 min
Jul 21, 6:15 PM EDTSpecial Weather StatementFFCWilcox30 min
Jul 21, 6:25 PM EDTSpecial Weather StatementFFCCrisp35 min
Jul 21, 6:49 PM EDTSpecial Weather StatementFFCDooly26 min
Jul 21, 7:04 PM EDTSpecial Weather StatementFFCWashington26 min
Jul 21, 7:08 PM EDTSpecial Weather StatementFFCPutnam37 min
Jul 21, 7:12 PM EDTSpecial Weather StatementFFCMacon33 min
Jul 21, 7:41 PM EDTSpecial Weather StatementFFCMacon34 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.