Alert archive / Georgia / Flash Flood Warnings in 2018

Flash Flood Warning 21, NWS Tallahassee, FL

December 2, 2018Brooks County, Lanier County, Lowndes County, Georgia

NWS Tallahassee, FL issued this flash flood warning at Dec 2, 2018, 11:53 PM EST for Brooks County, Lanier County, Lowndes County, Georgia. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 2, 2018, 11:53 PM EST (04:53 UTC)
Expired: Dec 3, 2018, 6:00 AM EST
In force: 6 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

Counties Brooks County, GA, Lanier County, GA, Lowndes County, GA

The radar

The Moody AFB radar (KVAX), 17 km from the middle of the area, began a volume at 04:53 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.

What was reported inside it

Time	Report	Where	Remark
Dec 3, 1:30 AM EST	FLASH FLOOD	Kinderlou, GA	FLOODING ACROSS SEVERAL DIRTS ROADS THROUGHOUT LOWNDES COUNTY. THE MAJOR ROADS REMAIN PASSABLE AS OF 130 AM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 4.9 hours before the alert went out and 118 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: 1233 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.7

Open this sounding in Storm Lab

The text

As transmitted.

274 
WGUS52 KTAE 030453
FFWTAE
GAC027-173-185-031100-
/O.NEW.KTAE.FF.W.0021.181203T0453Z-181203T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
1153 PM EST SUN DEC 2 2018

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Lowndes County in south central Georgia...
  Southern Lanier County in south central Georgia...
  Brooks County in south central Georgia...

* Until 600 AM EST Monday.

* At 1153 PM EST, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to 
  begin shortly given the already saturated conditions from previous 
  rainfall.

* Some locations that will experience flooding include...
  Lake Park, Quitman, Valdosta, Hahira, I-75 At Exit 16, Moody Air
  Force Base, Remerton, Dasher, Morven, Grooverville, Barretts,
  Nankin, Empress, Clyattville, Brooks Co A/p, I-75 At Exit 11,
  Dixie, Naylor, Greenwood and Twin Lakes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3087 8297 3086 8300 3085 8301 3085 8309
      3083 8309 3083 8310 3080 8310 3080 8312
      3079 8313 3063 8314 3066 8374 3085 8374
      3103 8348 3103 8318 3096 8297

$$

42-DVD

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 3, 2:24 AM EST	Special Weather Statement	TAE	Lowndes	36 min
Dec 3, 2:38 AM EST	Tornado Warning	TAE	Brooks, Lowndes	37 min
Dec 3, 3:04 AM EST	Tornado Warning	TAE	Lowndes	26 min
Dec 3, 5:51 AM EST	Areal Flood Warning	TAE	Brooks, Lanier, Lowndes	3 hr
Dec 3, 10:05 AM EST	River Flood Warning	TAE	Dougherty	23 min
Dec 3, 10:05 AM EST	River Flood Warning	TAE	Baker, Mitchell	24 hr

Nearby

Flash Flood Warnings in Georgia, 2018 Every flash flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.