Alert archive / South Carolina / Flash Flood Warnings in 2001

Flash Flood Warning 31, NWS Greenville-Spartanburg, SC

July 31, 2001Oconee County, South Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Jul 31, 2001, 12:18 AM EDT for Oconee County, South Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 31, 2001, 12:18 AM EDT (04:18 UTC)
Expired: Jul 31, 2001, 3:15 AM EDT
In force: 3 hr
Issued by: NWS Greenville-Spartanburg, SC
Area: Whole counties

County Oconee County, SC

The radar

The Greer radar (KGSP), 79 km from the middle of the area, began a volume at 04:17 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.3 hours before the alert went out and 203 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: 3452 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 712 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS52 KGSP 310425
FFWGSP

SCC073-310715-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1218 AM EDT TUE JUL 31 2001

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  OCONEE COUNTY IN UPSTATE SOUTH CAROLINA

* UNTIL 315 AM EDT

* AT 1218 AM EDT...WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER
  OF SHOWERS AND THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL FROM
  MOUNTAIN REST TO WALHALLA. THESE THUNDERSTORMS WERE NEARLY
  STATIONARY AND RADAR INDICATED RAINFALL RATES OF NEARLY TWO INCHES
  PER HOUR. ADDITIONAL HEAVY RAINFALL WILL LIKELY CONTINUE FOR AT
  LEAST THE NEXT HOUR IN THIS LOCATION.

* FLOODING ALONG STREAMS AND CREEKS WILL LIKELY DEVELOP IN THE
  VICINITY OF OCONEE STATE PARK AND ALONG...AND EAST OF...ROUTE 28
  FROM MOUNTAIN REST TO WALHALLA.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING). 
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODS AND FLASH FLOODS.
$$
HG

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 30, 10:28 PM EDT, 1 hour 50 minutes earlier.

Area forecast discussion, Jul 30, 10:28 PM EDT, 1 hour 50 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1028 PM EDT MON JUL 30 2001

ISOLATED THUNDERSTORMS ANCHORED TO THE OCONEE/JACKSON/TRANSYLVANIA
COUNTY LINE ON THE NORTH OF END OF LAKE JOCASEE CAUSING SOME
CONCERN.  RADAR RAINFALL ESTIMATES INDICATED 3 TO 5 INCHES DURING
THE PAST 3 HOURS...MORE IF USING THE TROPICAL Z/R.  APPEARS TO BE
THE IDEAL UPSLOPE WITH SOUTHEAST FLOW BEHIND FRONT WHICH HAS CLEARED
THE FA.  OTHER ACTIVITY MOVING THROUGH NE GA COUNTIES NOT LIKELY TO
CAUSE ANY PROBLEMS.  EXPECT ACTIVITY TO DECREASE DURING NEXT COUPLE
OF HOURS.  HOWEVER...LOW FFG NUMBERS FOR OCONEE SUGGEST HOLDING POPS
FOR AT LEAST THIS CLUSTER OF COUNTIES FOR A WHILE LONGER.  WILL
REMOVE POPS FROM OTHER GROUPS BUT LEAVE THESE WITH CHANCE POPS FOR A
WHILE.  OTHER CHANGES TO FORECAST WILL BE MINOR.              DELGADO

.GSP...
GA...NONE.
NC...NONE.
SC...NONE.

Nearby

Flash Flood Warnings in South Carolina, 2001 Every flash flood warning in 2001

Sources

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