Alert archive / South Carolina / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 229, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 21, 2002, 5:30 PM EDT for Pickens County, South Carolina. It was in force for 60 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 21, 2002, 5:30 PM EDT (21:30 UTC)
- Expired
- Jul 21, 2002, 6:30 PM EDT
- In force
- 60 min
- Issued by
- NWS Greenville-Spartanburg, SC
- Area
- Whole counties
County Pickens County, SC
The radar
The Greer radar (KGSP), 46 km from the middle of the area, began a volume at 21:30 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 21, 6:38 PM EDT | Hail 0.75 | Dacusville, SC |
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, 9.5 hours before the alert went out and 235 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.
- Mixed-layer CAPE
- 1664 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 935 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
059 WUUS52 KGSP 212130 SVRGSP SCC077-212230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 530 PM EDT SUN JUL 21 2002 THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN PICKENS COUNTY IN UPSTATE SOUTH CAROLINA * UNTIL 630 PM EDT * AT 530 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM WITH DAMAGING WINDS 9 MILES NORTHWEST OF GREENVILLE... OR ABOUT 4 MILES SOUTHEAST OF DACUSVILLE...MOVING SOUTHWEST AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... EASLEY AT 600 PM EDT. PICKENS AT 620 PM EDT. LIBERTY AT 630 PM EDT. PEOPLE IN THE PATH OF THIS SEVERE THUNDERSTORM SHOULD BE ALERT FOR LARGE HAIL AND DAMAGING WINDS. FREQUENT LIGHTNING AND LOCALLY HEAVY RAIN CAN OCCUR WITH ANY THUNDERSTORM. $$ NED
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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 3:20 PM EDT, 2 hours 10 minutes earlier.
Area forecast discussion, Jul 21, 3:20 PM EDT, 2 hours 10 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 320 PM EDT SUN JUL 21 2002 KGSP 88D LOOPS INDICATE ISOLATED TSTMS FIRING ACRS THE UPSTATE & INTO THE MTNS...AIDED BY ENE LLVL FLOW. LAPS DATA INDICATES GREATER INSTABILITY THAN WHAT WE HAVE SEEN THE PAST SVRL DAYS WITH VALUES RANGING FROM AROUND 1500 J/KG IN THE MTNS TO NEAR 2500 J/KG IN THE PIEDMONT. VWP INDICATES A UNIFORMLY DEEP BUT WEAK ENE FLOW ALL THE WAY UP THRU THE COLUMN. GIVEN THIS PROFILE...SOME MARGINAL ISOLATED SVR NOT OUT OF THE QUESTION & STORMS MAY BE ENHANCED ALONG THE ESCARPMENT...WITH LOCALIZED HEAVY RNFL...BUT OVERALL CVRG SHOULD REMAIN 20% OR LESS THRU MID-EVENING. ON MONDAY...RETROGRADING WEAK UPPER LVL LOW IS PROGGED TO BE LOCATED OVER THE CWFA & SHORT RANGE MODELS ARE ALL INDICATING A FAIR AMOUNT OF LARGE SCALE UVV...ESPECIALLY OVER THE MTNS. WOULD EXPECT MORE...MAINLY DIURNALLY FIRED TSTM CVRG THAN WHAT WE ARE SEEING ATTM...BUT WILL NOT DRIFT FROM GOING CHC POPS. PATTERN LOOKS TO BE MORE ACTIVE THRU THE MIDWEEK PERIOD AS UPPER TROUGH PERSISTS ACRS THE ERN U.S. & PERIODIC VORTS ROTATE IN FROM THE NORTHWEST. SYNOPTIC SCALE SFC BNDRY IS ALSO PROGGED TO APPROACH AND LINGER NEAR THE CWFA THIS PERIOD ALONG WITH DEEPER RH. ALL THIS SHOULD ADD UP TO HIGHER THAN CLIMO POPS TUE-THU. FOR DAYS 5-7...UPPER PATTERN WILL DEAMPLIFY AND EASTERN U.S TROUGH TO BE REPLACED WITH A MORE ZONAL FLOW...ALTHOUGH EXPECTEDLY WEAK FLOW OVER THE SE US. DEEP RH LOOKS TO GET DISPLACED AS WELL...SO A RETURN TO MORE TYPICAL DIURNALLY FIRED...SCATTERED...IF THAT...DEEP CONVECTION. FCSTID = 55 GSP 72 90 71 90 / 10 30 30 40 AND 72 91 71 91 / 10 30 30 40 CLT 71 91 70 90 / 0 30 30 40 HKY 69 89 69 89 / 0 30 30 40 AVL 65 86 66 85 / 10 40 30 40 .GSP... GA...NONE. NC...NONE. SC...NONE.
The office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:41 PM EDT | Severe Thunderstorm Warning | GSP | Oconee | 64 min |
Nearby
Severe Thunderstorm Warnings in South Carolina, 2002Every 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.