Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 49, NWS Columbia, SC

June 11, 2018Columbia County, McDuffie County, Georgia

NWS Columbia, SC issued this severe thunderstorm warning at Jun 11, 2018, 5:13 PM EDT for Columbia County, McDuffie County, Georgia. It was in force for 62 min. 2 reports 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: Jun 11, 2018, 5:13 PM EDT (21:13 UTC)
Expired: Jun 11, 2018, 6:15 PM EDT
In force: 62 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Columbia County, GA, McDuffie County, GA

The radar

The Robins AFB radar (KJGX), 118 km from the middle of the area, began a volume at 21:13 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
Jun 11, 5:16 PM EDT	TSTM WND DMG	6 Nw Grovetown, GA	COLUMBIA COUNTY DISPATCH REPORTED TREES DOWN ON LOUISVILLE RD AT LANATTE LN. TIME ESTIMATED BASED ON RADAR.
Jun 11, 5:40 PM EDT	HAIL 1.25	1 Wnw Harlem, GA	MEMBER OF THE PUBLIC REPORTED HAIL UP TO HALF DOLLAR SIZE IN HARLEM, GA. VIDEO OF HAIL SHARED VIA SOCIAL MEDIA.

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

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.2 hours before the alert went out and 191 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: 68 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 1055 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: -13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

021 
WUUS52 KCAE 112113
SVRCAE
GAC073-189-112215-
/O.NEW.KCAE.SV.W.0049.180611T2113Z-180611T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
513 PM EDT MON JUN 11 2018

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Southwestern Columbia County in east central Georgia...
  Southeastern McDuffie County in east central Georgia...

* Until 615 PM EDT.

* At 512 PM EDT, severe thunderstorms in central McDuffie
  County were moving southward near 15 mph and toward the
  south part of McDuffie County and parts of western
  Columbia County. 

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Grovetown, Thomson, Harlem and Dearing. 

This includes Interstate 20 in Georgia between mile markers 177 and
188.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection seek shelter inside a sturdy building and stay
away from windows.

&&

LAT...LON 3345 8258 3346 8241 3358 8244 3356 8225
      3342 8220 3331 8235 3331 8239 3334 8244
      3334 8250 3336 8253 3336 8255 3341 8255
TIME...MOT...LOC 2112Z 295DEG 12KT 3352 8234 3352 8255 

HAIL...1.00IN
WIND...60MPH
 
$$

1 follow-up statement

638 
WWUS52 KCAE 112206
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
606 PM EDT MON JUN 11 2018

GAC073-189-112216-
/O.EXP.KCAE.SV.W.0049.000000T0000Z-180611T2215Z/
Columbia GA-McDuffie GA-
606 PM EDT MON JUN 11 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN COLUMBIA AND
SOUTHEASTERN MCDUFFIE COUNTIES WILL EXPIRE AT 615 PM EDT...

The storms which prompted the warning have moved south of the area. 

LAT...LON 3345 8258 3346 8241 3358 8244 3356 8225
      3342 8220 3331 8235 3331 8239 3334 8244
      3334 8250 3336 8253 3336 8255 3341 8255
TIME...MOT...LOC 2206Z 295DEG 12KT 3345 8216 3345 8237 

$$

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 3:55 PM EDT	Special Weather Statement	CAE	Lincoln	35 min
Jun 11, 4:43 PM EDT	Severe Thunderstorm Warning	CAE	McDuffie	62 min
Jun 11, 5:24 PM EDT	Special Weather Statement	CAE	Richmond	36 min
Jun 11, 5:29 PM EDT	Severe Thunderstorm Warning	CAE	Richmond	61 min
Jun 11, 5:50 PM EDT	Severe Thunderstorm Warning	CAE	Burke	55 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2018 Every severe thunderstorm 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.