Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 81, NWS Atlanta, GA

March 21, 20178 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Mar 21, 2017, 8:44 PM EDT for 8 counties in Georgia. It was in force for 46 min. 12 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
Mar 21, 2017, 8:44 PM EDT (00:44 UTC)
Expired
Mar 21, 2017, 9:30 PM EDT
In force
46 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Banks County, GA, Barrow County, GA, Forsyth County, GA, Gwinnett County, GA, Hall County, GA, Jackson County, GA, Madison County, GA, White County, GA

The radar

The Greer radar (KGSP), 138 km from the middle of the area, began a volume at 00:45 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

TimeReportWhereRemark
Mar 21, 8:46 PM EDTTSTM WND DMGWestside, GA*** 1 INJ *** TREE FELL ONTO MOBILE HOME TRAPPING AN INDIVIDUAL INSIDE UNDER THE TREE. INDIVIDUAL...MALE...WAS TAKEN TO AREA HOSPITAL FOR TREATMENT. HOME WAS LOCATED ON HIGHLAND TERRACE
Mar 21, 8:55 PM EDTTSTM WND DMG2 Nne Sells, GAROOF BLOWN OFF A BUILDING AND A TREE FELL ONTO THE SAME BUILDING. ALONG HWY 332 EAST OF BRASELTON.
Mar 21, 8:55 PM EDTTSTM WND DMG2 N Sells, GA*** 1 FATAL *** LARGE TREE DOWNED ON HOME KILLING 1 PERSON...29 YEAR OLD MALE...INSIDE THE HOME ON CAMBRIDGE FARMS DR. IN THE HOUCHTON COMMUNITY .
Mar 21, 8:55 PM EDTTSTM WND DMG2 N Sells, GA*** 1 FATAL *** LARGE TREE DOWNED ON HOME KILLING 1 PERSON INSIDE THE HOME IN CAMBRIDGE FARMS SUBDIVISION.
Mar 21, 8:55 PM EDTTSTM WND DMG3 Ssw Pendergrass, GA*** 1 FATAL *** LARGE TREE DOWNED ON HOME KILLING 1 PERSON INSIDE THE HOME ALONG HWY 332 BETWEEN BRASELTON AND PENDERGRASS. ADDITIONAL DETAILS UNKNOWN AT THIS TIME.
Mar 21, 8:55 PM EDTTSTM WND DMGFairview, GATRAINED SPOTTER ESTIMATED 50-60 MPH WINDS WITH TREES SNAPPING ALONG HWY 60 AND GUY COOPER ROAD.
Mar 21, 9:00 PM EDTTSTM WND DMG1 Nne Barrow Heights, GADAMAGE TO A BARN ON SUNSET DRIVE...TIN ROOF RIPPED OFF AND DEBRIS SCATTERED AROUND
Mar 21, 9:03 PM EDTTORNADO1 E Red Stone, GAAN EF1 TORNADO WITH MAX WINDS OF 95 MPH BEGAN IN A RURAL AREA NEAR NEW KINGS BRIDGE RD AND TRAVELED 0.5 MILES. A HOME UNDER CONSTRUCTION WAS PULLED OFF ITS MOORINGS. AT LEAST A DOZEN LARGE TREES WERE ALSO SNAPPED OR UPROOTED.
Mar 21, 9:03 PM EDTTORNADO3 E Russell, GABRIEF EF0 TORNADO WITH A PATH LENGTH OF 200 YDS OR 0.1 MILES DESTROYED A BARN AND CARRIED DEBRIS A QUARTER MILE. SEVERAL LARGE TREES WERE SNAPPED OR UPROOTED.
Mar 21, 9:05 PM EDTTSTM WND DMG1 Ese Arcade, GATREES WERE REPORTED DOWN ON TWO CARS IN DIFFERENT LOCATIONS IN ARCADE... GA
Mar 21, 9:05 PM EDTTSTM WND DMG1 Ese Arcade, GATREES WERE REPORTED DOWN ON TWO CARS IN DIFFERENT LOCATIONS IN ARCADE... GA
Mar 21, 9:09 PM EDTTSTM WND DMG2 Ene Habersham Hills, GANUMEROUS REPORTS OF TREES DOWN THROUGHOUT GWINNETT COUNTY ACROSS ROADS.. NOTABLY I85 AT MM 117 IN BUFORD.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Mar 21, 3:33 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.7 hours before the alert went out and 139 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 00:00Z on 2017-03-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 377 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 00:00Z on 2017-03-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 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
377 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
2348 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
160 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

674 
WUUS52 KFFC 220044
SVRFFC
GAC011-013-117-135-139-157-195-311-220130-
/O.NEW.KFFC.SV.W.0081.170322T0044Z-170322T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
844 PM EDT TUE MAR 21 2017

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Barrow County in north central Georgia...
  Northeastern Forsyth County in north central Georgia...
  Banks County in northeastern Georgia...
  Northeastern Gwinnett County in north central Georgia...
  Southeastern White County in northeastern Georgia...
  Hall County in north central Georgia...
  Jackson County in northeastern Georgia...
  Western Madison County in northeastern Georgia...

* Until 930 PM EDT

* At 843 PM EDT, severe thunderstorms were located extending from 
  Demorest to near Gainesville to Buford, moving east-southeast at 
  50 mph.

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

  SOURCE...Radar indicated, plus multiple reports of downed trees 
           and powerlines due to the very strong winds. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Gainesville, Winder, Jefferson, Commerce, Cumming, Homer, Sugar
  Hill, Buford, Braselton, Auburn, Flowery Branch, Dacula, Oakwood,
  Lula, Maysville, Arcade, Nicholson, Hoschton, Clermont and
  Bethlehem.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across northwest and north central Georgia. SEEK SHELTER 
NOW inside a sturdy structure and stay away from windows! 

If you see wind damage...hail or flooding...wait until the storm has 
passed...and then 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 3460 8364 3455 8362 3451 8367 3443 8361
      3444 8361 3449 8354 3446 8340 3442 8338
      3432 8339 3427 8334 3424 8334 3426 8330
      3424 8321 3406 8329 3393 8380 3422 8418
      3434 8398 3433 8396 3440 8386 3461 8370
TIME...MOT...LOC 0043Z 286DEG 49KT 3457 8355 3429 8375 3411 8400 

HAIL...0.75IN
WIND...60MPH
 
$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 21, 8:00 PM EDTSpecial Weather StatementFFCWalton30 min
Mar 21, 8:02 PM EDTSevere Thunderstorm WarningFFCBanks, Jackson, Madison31 min
Mar 21, 8:07 PM EDTSevere Thunderstorm WarningFFCDawson, Fannin, Gilmer, Hall, Lumpkin, Pickens and 3 more38 min
Mar 21, 8:08 PM EDTSevere Thunderstorm WarningFFCMorgan, Oconee, Walton52 min
Mar 21, 8:14 PM EDTSevere Thunderstorm WarningFFCBartow, Cherokee, Cobb, Dawson, Floyd, Forsyth and 3 more46 min
Mar 21, 8:19 PM EDTFlash Flood WarningFFCClarke, Greene, Oconee, Oglethorpe, Taliaferro, Wilkes6 hr
Mar 21, 8:30 PM EDTSpecial Weather StatementFFCOglethorpe45 min
Mar 21, 8:40 PM EDTSevere Thunderstorm WarningFFCCarroll, Clayton, Cobb, DeKalb, Douglas, Forsyth and 5 more50 min
Mar 21, 8:49 PM EDTSevere Thunderstorm WarningFFCGreene, Oconee, Oglethorpe41 min
Mar 21, 9:20 PM EDTSpecial Weather StatementFFCButts, Clayton, Coweta, Fayette, Heard, Henry and 8 more40 min
Mar 21, 9:22 PM EDTSevere Thunderstorm WarningFFCBarrow, Clarke, Greene, Jackson, Madison, Morgan and 5 more38 min
Mar 21, 9:45 PM EDTSevere Thunderstorm WarningFFCGlascock, Greene, Hancock, Morgan, Oglethorpe, Putnam and 4 more45 min
Mar 21, 9:53 PM EDTSpecial Weather StatementFFCBaldwin, Butts, Harris, Jasper, Jones, Lamar and 7 more52 min
Mar 21, 10:24 PM EDTSpecial Weather StatementFFCBaldwin, Glascock, Hancock, Jefferson, Jones, Washington36 min
Mar 21, 10:55 PM EDTSpecial Weather StatementFFCEmanuel, Johnson, Wilkinson50 min
Mar 21, 11:51 PM EDTSpecial Weather StatementFFCMontgomery, Toombs39 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2017Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.