Alert archive / South Carolina / Flash Flood Warnings in 1998

Flash Flood Warning 22, NWS Wilmington, NC

July 31, 1998Georgetown County, South Carolina

NWS Wilmington, NC issued this flash flood warning at Jul 31, 1998, 7:20 PM EDT for Georgetown County, South Carolina. It was in force for 75 min. 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, 1998, 7:20 PM EDT (23:20 UTC)
Expired: Jul 31, 1998, 8:35 PM EDT
In force: 75 min
Issued by: NWS Wilmington, NC
Area: Whole counties

County Georgetown County, SC

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 11.3 hours before the alert went out and 87 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: 1545 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: -18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KILM 312318
FFWILM
SCC043-010035-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON NC
720 PM EDT FRI JUL 31 1998

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A...

* FLOOD WARNING FOR...
  EASTERN GEORGETOWN COUNTY IN NORTHEASTERN SOUTH CAROLINA

* UNTIL 835 PM EDT

* AT 715 PM EDT... DOPPLER RADAR INDICATED 2.5 TO 3 INCHES OF RAIN
  PER HOUR ALONG HIGHWAY 17 NEAR MURRLELS INLET AND PAWLEYS ISLAND.
  THIS HEAVY RIAN WAS DUE TO A LARGE AREA OF THUNDERSTORMS THAT WERE
  MOVING THROUGH THE AREA.

  AN ADDITIONAL 1 TO 1.5 INCHES OF RAIN CAN BE EXPECTED.

DO NOT DRIVE THROUGH FLOODED AREAS. THE ROADBED MAY NOT BE
INTACT UNDER THE WATER. IF YOUR VEHICLE STALLS...ABANDON IT
IMMEDIATELY AND SEEK HIGHER GROUND.

HEWITT

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 Wilmington, NC wrote its last area forecast discussion before this flash flood warning went out at Jul 31, 2:22 PM EDT, 4 hours 58 minutes earlier.

Area forecast discussion, Jul 31, 2:22 PM EDT, 4 hours 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEWPORT/MOREHEAD CITY NC
222 PM EDT FRI JUL 31 1998

RDU: 40 POPS FOR TONIGHT.  MAYBE A 20/30 POP SE COAST FOR SAT AM.
LOWS TONIGHT LOW 70S.  HIGHS SAT 80-85.  LOWS SAT NIGHT NR 70. HIGHS
SUN LOW 80S.

CWF: AVN SOLN OF A DEEPENING ALMOST TROPICAL SYSTEM OFF THE NC COAST
SAT/SUN WAS DISCARDED AFTER COORD WITH MPC/ILM.  INSTEAD A BLEND OF
THE NGM/ETA WAS USED WHICH IS CONSISTENT WITH PREVIOUS FCST.  THUS A
MINIMAL SCA WILL BE IN PLACE FOR THE ENTIRE COAST AND SOUNDS FOR NE
FLOW REGEIME.  MODEL WIND SPEED FCSTS SEEMED ON THE LOW SIDE
CONSIDERING STRENGTH OF HIGH AND WARM WATER TEMPS OFF THE SE COAST.
WILL BRING SPEEDS BELOW SCA LEVELS S COAST AND SOUNDS SAT NIGHT/SUN
BUT SEAS WILL BE NR 6 FT.  MUST WATCH FOR WAVE DEVELOPMENT ALONG
STALLED OUT BNDRY FOR POSSIBLY STRONGER WINDS.

DISC: ALL 3 MODELS OFFER DIFFERENT SOLNS FOR THE WEEKEND FORECAST.
THE AVN APPEARS TO BE SUFFERING FROM CONVECTIVE FEEDBACK WITH
PERSISTENT LOW PRES OFF THE NC COAST.  THE ETA/NGM DIFFER WITH
RESPECT TO AMOUNT OF DRYING ASSCTD WITH ANTICYLONE RIDGING IN FROM
THE LOWER GREAT LAKES SAT AND SUN.  THOUGHT THE NGM WAS TOO WET
CONSIDERING UPSTREAM CLOUDS OVR PA/NY WHICH ARE INSTAB CU/SC.  SO A
SLOWED DOWN VERSION OF THE ETA SEEMS LIKE THE BEST CHOICE AT THIS
TIME WITH GRADUAL CLEARING BEGINING LATE TONIGHT NRN SECTIONS AND
CONTINUING ON SAT FOR SRN AND COASTAL LOCATIONS.  THUS SKIES WILL BE
MOSTLY CLOUDY ONCE CLEARING ENSUES.  FLY IN OINTMENT IS THE
POSSIBILITY THAT A LOW WILL TRACK ALONG THE STALLED OFFSHORE FRONT
AND THROW SOME MOISTURE BACK AT THE COAST ON SUNDAY.

WITH RESPECTS TO THE COLD FRONT CURRENTLY CROSSING THE AREA FEEL
THAT PRE-FRONTAL CONVECTION WILL BE LIMITED WITH MOST OF THE
"ACTION" POST FRONTAL IN THE FORM OF LIGHT RAIN/DRIZZLE FOR SVRL HRS
AFTER FROPA.  WARM MID LVL TEMPS AND ONLY WEAK CONVERGENCE
INHIBITING WIDESPREAD ACTIVITY.  COULD SEE SOME INCREASE TOWARDS
EVENING AS ETA/NGM INCREASE LIFT WITH FRONT AS IT CROSSES SRN HALF
OF MY CWA.

.MHX...SCA COASTAL WATERS AND SOUNDS.

ELARDO

In the hours before

Local storm report, Jul 31, 7:18 PM EDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON NORTH CAROLINA
718 PM EDT FRI JUL 31 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0500 PM    MAXTON                    NC   FLOODING
07/31/98   ROBESON                        MAXTON POLICE REPORTED
                                          FLOODING ON N. PATTERSON
                                          AND E. GRAHAM STREETS IN
                                          THE TOWN OF MAXTON

0657 PM    MYRTLE BEACH              SC   FLOODING
07/31/98   HORRY                          UPWARDS TO 2 FEET DEEP
                                          WATER REPORTED ON KINGS
                                          HIGHWAY BETWEEN 9TH AND
                                          11TH AVENUE...PER SKYWARN
                                          SPOTTERS

PJK

Local storm report, Jul 31, 7:18 PM EDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON NORTH CAROLINA
718 PM EDT FRI JUL 31 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0500 PM    MAXTON                    NC   FLOODING
07/31/98   ROBESON                        MAXTON POLICE REPORTED
                                          FLOODING ON N. PATTERSON
                                          AND E. GRAHAM STREETS IN
                                          THE TOWN OF MAXTON

0657 PM    MYRTLE BEACH              SC   FLOODING
07/31/98   HORRY                          UPWARDS TO 2 FEET DEEP
                                          WATER REPORTED ON KINGS
                                          HIGHWAY BETWEEN 9TH AND
                                          11TH AVENUE...PER SKYWARN
                                          SPOTTERS

PJK

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 31, 5:25 PM EDT	Severe Thunderstorm Warning	ILM	Horry	45 min
Jul 31, 5:59 PM EDT	Severe Thunderstorm Warning	ILM	Georgetown	51 min
Jul 31, 6:51 PM EDT	Flash Flood Warning	ILM	Horry	59 min
Jul 31, 6:52 PM EDT	Flash Flood Warning	ILM	Horry	58 min

Nearby

Flash Flood Warnings in South Carolina, 1998 Every flash flood warning in 1998

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.