Alert archive / Georgia / Special Weather Statements in 2017

Special Weather Statement, NWS Atlanta, GA

July 20, 2017Harris County, Georgia

NWS Atlanta, GA issued this special weather statement at Jul 20, 2017, 5:19 PM EDT for Harris 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: Jul 20, 2017, 5:19 PM EDT (21:19 UTC)
Expired: Jul 20, 2017, 5:45 PM EDT
In force: 26 min
Issued by: NWS Atlanta, GA
Wind: 40

County Harris County, GA

The radar

The Maxwell AFB radar (KMXX), 69 km from the middle of the area, began a volume at 21:20 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, 9.3 hours before the alert went out and 90 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 113 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1442 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 21 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 Jul 20, 3:41 PM EDT, 1 hour 38 minutes earlier.

Area forecast discussion, Jul 20, 3:41 PM EDT, 1 hour 38 minutes before

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</head>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Jul 20, 3:43 PM EDT, 1 hour 36 minutes before

Hazardous Weather Outlook
National Weather Service Peachtree City GA
343 PM EDT Thu Jul 20 2017

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-211945-
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-
343 PM EDT Thu Jul 20 2017

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

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

Isolated showers and thunderstorms expected across north and
central Georgia this afternoon and evening. An isolated severe
storm or two is possible, with the greatest chance across central
Georgia near a weakening stalled frontal boundary. The main
hazards with any storms that develop will be strong gusty winds,
heavy rainfall, frequent lightning, and small hail.

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

Isolated to scattered thunderstorms are possible Friday through
Wednesday in the afternoon and evening. Heat Index values will
approach 105 degrees mainly over portions of central Georgia,
generally Friday through Monday.

.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

Local storm report, Jul 20, 11:21 AM EDT, 5 hours 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1121 AM EDT THU JUL 20 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 PM     TSTM WND DMG     2 WNW LONG POND         32.10N  82.58W
07/19/2017                   MONTGOMERY         GA   EMERGENCY MNGR

            ABOUT TEN TREES REPORTED DOWN AT THE INTERSECTION OF N
            OLD RIVER RD AND DEER RUN RD.

&&

EVENT NUMBER FFC1701114

KING

Special weather statement, Jul 20, 2:27 PM EDT, 2 hours 52 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
227 PM EDT THU JUL 20 2017

GAZ021-201900-
Cherokee GA-
227 PM EDT THU JUL 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CHEROKEE COUNTY UNTIL
300 PM EDT...

At 227 PM EDT...a strong thunderstorm was over Waleska, or 8 miles
north of Canton...moving south at 15 mph.

  HAZARD...Winds up to 40 mph.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light...unsecured objects.

Some locations in the path of this storm include
Canton, Waleska, Buffington, Lake Arrowhead and Sutallee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately.

LAT...LON 3437 8462 3438 8450 3422 8433 3422 8465
TIME...MOT...LOC 1827Z 355DEG 12KT 3435 8455

WIND...40MPH

Special weather statement, Jul 20, 5:19 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
519 PM EDT THU JUL 20 2017

GAZ066-078-202145-
Harris GA-Troup GA-
519 PM EDT THU JUL 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN HARRIS AND SOUTHERN TROUP
COUNTIES UNTIL 545 PM EDT...

At 518 PM EDT...a strong thunderstorm was over Whitesville-Pine Lake,
or near Valley...moving south at 20 mph.

  HAZARD...Winds up to 40 mph and frequent lightning.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light...unsecured objects. Lightning is one of nature's
           leading killers. If you can hear thunder...you are close
           enough to be struck by lightning.

Some locations in the path of this storm include
River View, Goat Rock Lake, Mountain Hill, Jones Crossroads,
Bartletts Ferry Dam, Fortson, Mulberry Grove, Whitesville-Pine Lake
and Lake Harding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Electrical
appliances should not be used unless in an emergency.

LAT...LON 3288 8513 3290 8499 3261 8491 3261 8508
      3262 8509 3263 8508 3264 8511 3266 8509
      3269 8512 3272 8512 3274 8511 3274 8513
      3276 8514 3278 8512 3279 8515
TIME...MOT...LOC 2118Z 356DEG 19KT 3281 8508

WIND...40MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 10:47 PM EDT	Special Weather Statement	FFC	Wheeler	28 min
Jul 19, 10:50 PM EDT	Severe Thunderstorm Warning	FFC	Montgomery, Toombs, Wheeler	25 min
Jul 19, 11:14 PM EDT	Special Weather Statement	FFC	Wheeler	31 min
Jul 20, 2:27 PM EDT	Special Weather Statement	FFC	Cherokee	33 min
Jul 20, 6:53 PM EDT	Special Weather Statement	FFC	Pike	37 min
Jul 20, 7:17 PM EDT	Special Weather Statement	FFC	Emanuel	28 min

Nearby

Special Weather Statements in Georgia, 2017 Every 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.