Alert archive / Georgia / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 205, NWS Atlanta, GA

July 1, 2002Floyd County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 1, 2002, 7:42 PM EDT for Floyd County, Georgia. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 1, 2002, 7:42 PM EDT (23:42 UTC)
Expired: Jul 1, 2002, 8:15 PM EDT
In force: 33 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

County Floyd County, GA

The radar

The Northeast Alabama radar (KHTX), 109 km from the middle of the area, began a volume at 23:44 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
Jul 1, 8:10 PM EDT	Hail 0.75	Armuchee, GA	A storm spotter reported dime size hail.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.7 hours before the alert went out and 119 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: 1309 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Atlanta, GA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 2:30 PM EDT, 5 hours 12 minutes earlier.

Area forecast discussion, Jul 1, 2:30 PM EDT, 5 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
230 PM EDT MON JUL 1 2002

OVERVIEW: SURFACE HIGH AND UPPER LEVEL RIDGE CENTERED ACROSS MIDDLE
MISSISSIPPI VALLEY TO OHIO VALLEY WILL CONTINUE WITH GENERAL
EASTERLY FLOW ACROSS CWA.  PATTERN EXPECTED TO PERSIST THROUGHOUT
THE WEEK WITH RIDGE SLOWLY BUILDING EAST TOWARDS THE WEEKEND.
PLENTIFUL SURFACE MOISTURE AND WEAK IMPULSES IN UPPER LEVEL FLOW WILL
DRIVE INSTABILITY THROUGH THE WEEK BRINGING SCATTERED SHOWERS AND
THUNDERSTORMS MOST AFTERNOONS/EARLY EVENINGS CWA WIDE.

SHORT TERM: LATEST SURFACE ANALYSIS SHOWING BEST LI VALUES AND LIGHT
TO MODERATE LOW LEVEL CONVERGENCE FROM NORTHEAST MTNS TO ATL TO
AREAS WEST OF MCN.  THIS IN LINE WITH VIS SAT CU FIELD.  EXPECT
SCATTERED COVERAGE TO BEGIN TO DEVELOP NEXT FEW HOURS ALONG THIS
AXIS IN LINE WITH MODEL PRECIP EFF FIELDS.  EXPECT SCT RW/TRW
DEVELOPMENT TO CONTINUE AS SHORT WAVE ENERGY DROPS SOUTH AROUND NOSE
OF UPPER LEVEL RIDGE CENTERED ACROSS OHIO VALLEY FOR TUES AND WED.
BEST CHANCE WILL OCCUR WITH PEAK DIURNAL THERMAL INSTABILITY IN
AFTERNOON AND EARLY EVENINGS.  RIDGE BUILDS MORE WEST TO EAST INTO
MID ATLANTIC STATES BY SECOND HALF OF WEEK WHICH MAY DECREASE
POPS...ESPECIALLY ACROSS NORTHERN CWA BUT WILL STAY WITH CHANCE
CWA-WIDE AS EASTERLY SHORTWAVES PERSIST AND LOW LEVEL FLOW BECOMES
MORE SOUTHERLY.  PERSISTENCE METHODOLOGY WORKS WELL FOR TEMPS WITH
LITTLE THERMAL ADVECTION EXPECTED THROUGH THE PERIOD...THIS IN LINE
WITH FWC/FMR GUIDANCE.

EXTENDED: QUESTIONS BEGIN TO ARISE TOWARD WEEKEND ON IMPACT OF RIDGE
BUILDING EAST.  LATEST AVN/MRF HAVE SURFACE LOW ADVECTING STRONG
SOUTHERLY FLOW INTO REGION UNDER FAST EASTERLY UPPER LEVEL FLOW.
CAN/FSU SE/ECMWF STRONGER WITH RIDGING WHICH WOULD HELP SUPPRESS
POPS.  FOR NOW WILL KEEP DRY FORECAST FOR THE WEEKEND AND SEE HOW
THINGS GO ON TUESDAY.  WILL STAY CLOSE TO CLIMATOLOGY THROUGH THE
EXTENDED PERIOD IN LINE WITH PERSISTENCE AND GUIDANCE.

FORECAST CONFIDENCE: CONFIDENT ON SHORT TERM.  UNCERTAINTY INTO
WEEKEND.

FCSTID = 39

ATL  71 90 71 89 /  20 30 20 30
AHN  70 91 71 90 /  20 30 20 30
GVL  70 89 70 89 /  20 30 20 30
RMG  70 92 71 90 /  20 30 20 30
CSG  72 92 72 90 /  20 30 20 30
MCN  70 92 71 90 /  20 30 20 30

.ATL...
GA...NONE.

OUR DETAILED COUNTY FORECASTS ARE AVAILABLE AT FOUS52 KFFC.
OUR AREA FORECAST FOR NORTH AND CENTRAL GEORGIA CITIES IS AVAILABLE
AT FLUS42 KFFC.

JCD

In the hours before

Local storm report, Jul 1, 5:37 PM EDT, 2 hours 5 minutes before

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Local storm report, Jul 1, 7:40 PM EDT, 2 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:02 PM EDT	Severe Thunderstorm Warning	FFC	Chattooga	43 min
Jun 30, 8:36 PM EDT	Severe Thunderstorm Warning	FFC	Walker	24 min
Jul 1, 5:08 PM EDT	Severe Thunderstorm Warning	FFC	Paulding	22 min
Jul 1, 5:11 PM EDT	Severe Thunderstorm Warning	FFC	Hall	19 min
Jul 1, 5:31 PM EDT	Severe Thunderstorm Warning	FFC	Hall	29 min
Jul 1, 5:39 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth	31 min
Jul 1, 6:11 PM EDT	Severe Thunderstorm Warning	FFC	Gwinnett	34 min
Jul 1, 6:17 PM EDT	Severe Thunderstorm Warning	FFC	Dawson	28 min
Jul 1, 6:46 PM EDT	Severe Thunderstorm Warning	FFC	Gwinnett	29 min
Jul 1, 7:09 PM EDT	Severe Thunderstorm Warning	FFC	Murray	36 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2002 Every severe thunderstorm warning in 2002

Sources

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