Alert archive / Georgia / Flash Flood Warnings in 2022

Flash Flood Warning 29, NWS Atlanta, GA

August 20, 2022Murray County, Whitfield County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 20, 2022, 7:08 PM EDT for Murray County, Whitfield County, Georgia. It was in force for 3 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: Aug 20, 2022, 7:08 PM EDT (23:08 UTC)
Expired: Aug 20, 2022, 10:28 PM EDT
In force: 3 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Murray County, GA, Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 116 km from the middle of the area, began a volume at 23:09 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, 11.1 hours before the alert went out and 169 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: 539 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

159 
WGUS52 KFFC 202308
FFWFFC
GAC213-313-210515-
/O.NEW.KFFC.FF.W.0029.220820T2308Z-220821T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
708 PM EDT Sat Aug 20 2022

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Northeastern Murray County in northwestern Georgia...
  Northeastern Whitfield County in northwestern Georgia...

* Until 115 AM EDT Sunday.

* At 708 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Dalton, Chatsworth, Varnell, Eton, Sumac, Crandall, Beaverdale, 
  Dawnville and Conasauga Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3482 8496 3487 8498 3493 8493 3495 8486
      3494 8469 3492 8466 3488 8464 3479 8468
      3479 8482

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

239 
WGUS72 KFFC 210228
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
1028 PM EDT Sat Aug 20 2022

GAC213-313-210238-
/O.CAN.KFFC.FF.W.0029.000000T0000Z-220821T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Murray GA-Whitfield GA-
1028 PM EDT Sat Aug 20 2022

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN MURRAY AND 
NORTHEASTERN WHITFIELD COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3482 8496 3487 8498 3493 8493 3495 8486
      3494 8469 3492 8466 3488 8464 3479 8468
      3479 8482

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 11:51 PM EDT	Special Weather Statement	FFC	Meriwether	24 min
Aug 20, 12:53 AM EDT	Special Weather Statement	FFC	Meriwether	37 min
Aug 20, 1:34 AM EDT	Special Weather Statement	FFC	Coweta	11 min
Aug 20, 3:09 PM EDT	Special Weather Statement	FFC	Carroll	36 min
Aug 20, 6:21 PM EDT	Severe Thunderstorm Warning	FFC	Fannin, Gilmer, Murray, Whitfield	39 min
Aug 20, 6:44 PM EDT	Special Weather Statement	FFC	Forsyth	31 min
Aug 20, 7:00 PM EDT	Severe Thunderstorm Warning	FFC	Fannin, Gilmer, Murray	30 min
Aug 20, 7:55 PM EDT	Special Weather Statement	FFC	Gilmer	50 min

Nearby

Flash Flood Warnings in Georgia, 2022 Every flash flood warning in 2022

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.