Alert archive / Georgia / Flash Flood Warnings in 2017

Flash Flood Warning 32, NWS Atlanta, GA

July 14, 2017Gilmer County, Murray County, Whitfield County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 14, 2017, 6:58 PM EDT for Gilmer County, Murray County, Whitfield County, Georgia. It was in force for 6 hr. 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 14, 2017, 6:58 PM EDT (22:58 UTC)
Expired
Jul 15, 2017, 1:00 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Gilmer County, GA, Murray County, GA, Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 123 km from the middle of the area, began a volume at 22:59 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, 11.0 hours before the alert went out and 145 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 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 889 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 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
889 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1052 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

111 
WGUS52 KFFC 142258
FFWFFC
GAC123-213-313-150500-
/O.NEW.KFFC.FF.W.0032.170714T2258Z-170715T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
658 PM EDT FRI JUL 14 2017

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Murray County in northwestern Georgia...
  Northwestern Gilmer County in north central Georgia...
  Southeastern Whitfield County in northwestern Georgia...

* Until 100 AM EDT Saturday

* At 657 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Two to three inches of rain have already fallen, with 
  locally higher amounts. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Dalton, Chatsworth, Eton, Carters, Tails Creek, Ramhurst,
  Mountaintown, Fort Mountain State Park and North Georgia Speedway.

Additional rainfall amounts up to an inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

If you see significant flooding call the National Weather Service
toll free at 1 8 6 6 7 6 3 4 4 6 6 or tweet us your report at
NWSATLANTA.

&&

LAT...LON 3485 8452 3461 8459 3460 8471 3460 8473
      3461 8473 3461 8472 3462 8472 3462 8474
      3461 8475 3461 8486 3462 8486 3462 8491
      3463 8491 3463 8493 3462 8493 3462 8495
      3481 8490

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 8:24 PM EDTSpecial Weather StatementFFCHaralson51 min
Jul 13, 8:26 PM EDTSpecial Weather StatementFFCDeKalb49 min
Jul 13, 8:30 PM EDTSpecial Weather StatementFFCHarris, Muscogee, Troup45 min
Jul 13, 9:16 PM EDTSpecial Weather StatementFFCTroup44 min
Jul 13, 9:19 PM EDTSpecial Weather StatementFFCDeKalb26 min
Jul 14, 3:19 PM EDTSpecial Weather StatementFFCFloyd, Polk26 min
Jul 14, 4:19 PM EDTSpecial Weather StatementFFCChattooga, Floyd26 min
Jul 14, 4:32 PM EDTSpecial Weather StatementFFCCatoosa, Dade, Walker28 min
Jul 14, 4:50 PM EDTSpecial Weather StatementFFCBartow, Cherokee, Pickens25 min
Jul 14, 4:58 PM EDTSpecial Weather StatementFFCChattooga32 min
Jul 14, 5:21 PM EDTSpecial Weather StatementFFCBartow, Gilmer, Gordon, Pickens24 min
Jul 14, 5:28 PM EDTSpecial Weather StatementFFCStewart, Webster47 min
Jul 14, 5:34 PM EDTSpecial Weather StatementFFCChattooga26 min
Jul 14, 5:42 PM EDTSevere Thunderstorm WarningFFCGilmer, Gordon, Murray48 min
Jul 14, 5:47 PM EDTSpecial Weather StatementFFCTroup43 min
Jul 14, 5:54 PM EDTSpecial Weather StatementFFCCherokee, Dawson, Forsyth, Hall, Pickens36 min
Jul 14, 6:11 PM EDTSpecial Weather StatementFFCFannin34 min
Jul 14, 6:29 PM EDTSpecial Weather StatementFFCCherokee, Dawson, Forsyth, Hall, Lumpkin31 min
Jul 14, 6:32 PM EDTSpecial Weather StatementFFCFannin, Gilmer, Gordon, Murray28 min
Jul 14, 6:41 PM EDTSpecial Weather StatementFFCHaralson, Paulding, Polk34 min
Jul 14, 6:55 PM EDTFlash Flood WarningFFCCherokee, Dawson, Forsyth, Fulton, Lumpkin, Pickens6 hr
Jul 14, 7:03 PM EDTSpecial Weather StatementFFCBanks, DeKalb, Forsyth, Gwinnett, Hall27 min
Jul 14, 7:15 PM EDTSpecial Weather StatementFFCHarris45 min
Jul 14, 7:22 PM EDTFlash Flood WarningFFCHall6 hr
Jul 14, 7:23 PM EDTSpecial Weather StatementFFCCherokee, Cobb, Paulding37 min
Jul 14, 7:30 PM EDTSpecial Weather StatementFFCFannin, Towns, Union30 min
Jul 14, 7:33 PM EDTSpecial Weather StatementFFCGwinnett, Hall, White27 min
Jul 14, 7:55 PM EDTSpecial Weather StatementFFCTowns, Union35 min

Nearby

Flash Flood Warnings in Georgia, 2017Every flash flood warning 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.