Alert archive / North Carolina / Flash Flood Warnings in 1999

Flash Flood Warning 34, NWS Raleigh, NC

September 28, 1999Sampson County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 28, 1999, 7:11 AM EDT for Sampson County, North Carolina. It was in force for 4 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
Sep 28, 1999, 7:11 AM EDT (11:11 UTC)
Expired
Sep 28, 1999, 11:00 AM EDT
In force
4 hr
Issued by
NWS Raleigh, NC
Area
Whole counties

County Sampson County, NC

The radar

The Raleigh/Durham radar (KRAX), 76 km from the middle of the area, began a volume at 11:10 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

Newport, NC (KMHX), launched 00:00Z, 11.2 hours before the alert went out and 138 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, Newport, NC at 00:00Z on 1999-09-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 382 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Newport, NC at 00:00Z on 1999-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.1939Sfc1 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
382 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
696 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
105 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 KRDU 281112
FFWRDU
NCC163-281500-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
711 AM EDT TUE SEP 28 1999

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SAMPSON COUNTY IN NORTH CAROLINA

* UNTIL 1100 AM EDT

* NATIONAL WEATHER SERVICE DOPPLER RADAR MODERATE TO HEAVY RAINS
  OVER SAMPSON COUNTY. HEAVIEST RAINS WERE NORTH OF CLINTON WHERE
ONE TO TWO INCHES OF RAIN PER HOUR ARE ESTIMATED. FLOODING OF LOW
LYING AREAS AND ROADWAYS IS LIKELY.

MOTORISTS SHOULD BE ON THE ALERT FOR STANDING WATER AND ROAD
CLOSURES. RESIDENTS IN THE AREA SHOULD MONITOR THE LOCAL CREEKS AND
STREAMS AS WELL AS THE LOCAL WEATHER.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

RLH

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 Raleigh, NC wrote its last area forecast discussion before this flash flood warning went out at Sep 28, 3:00 AM EDT, 4 hours 11 minutes earlier.

Area forecast discussion, Sep 28, 3:00 AM EDT, 4 hours 11 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
3 AM EDT TUE SEP 28 1999

PLAN TO LET EXTEND WATCH FOR COUNTIES LISTED BELOW TO 00Z 29TH.
FLOOD THREAT IS ISOLATED TO EASTERNMOST PART OF OUR CWA. ADDITIONAL
FLASH FLOOD WARNINGS NOT YET RULED OUT IN THIS AREA.

WEDNESDAY:
NGM CLOSELY FOLLOWS OLD ETA WITH LA VORT ADVANCING TO W NC BY 18Z
WEDNESDAY. NEW AVN ARRIVES AT THE SAME CONCLUSION WITH VORT IN
CENTRAL NC AT 48H. ALL MODELS STILL ADVERTISE GOOD VEERING OF LOW
LEVEL WINDS THROUGH THE PERIOD. ALL ALSO AGREE ON LOW LEVEL JET
SUPPORT MOVING IN WITH VORT WEDNESDAY. WITH RELATIVELY GOOD
CONTINUITY BETWEEN MODELS AND OVER A COUPLE OF RUNS...WILL ACCEPT
THIS FEATURE AS REALITY AND SIGNIFICANTLY BOOST POPS.

TODAY/TONIGHT:
WEAKENING SC VORT FCST TO MOVE N INTO NC TODAY BY NGM WHILE AVN
REJECTING THIS IDEA. GOOD VEERING OF WINDS IN LOW LEVELS FCST AND
DEEP MOISTURE PERSISTS. NOT IMPRESSED WITH VORT HARD TO FIGHT HIGH
POP NUMBERS ON NUMERIC GUIDANCE. THERE DOES SEEM TO BE A LULL IN
DYNAMICS OVERNIGHT...ENOUGH TO DROP POPS ALL THE WAY BACK TO LOW
LIKELIHOOD.

TEMPS WILL CONTINUE RAIN SUPPRESSED DURING THE DAY WITH TIGHT
DIURNAL SPREADS.

.RAH...FLASH FLOOD WATCH TODAY FOR EDGECOMBE..WILSON..WAYNE

RLH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 27, 9:00 PM EDTFlash Flood WarningRAHWayne, Wilson60 min
Sep 27, 11:12 PM EDTFlash Flood WarningRAHEdgecombe108 min
Sep 28, 1:04 AM EDTFlash Flood WarningRAHEdgecombe4 hr
Sep 28, 1:23 AM EDTFlash Flood WarningRAHWayne3 hr
Sep 28, 4:34 AM EDTFlash Flood WarningRAHWayne6 hr
Sep 28, 7:37 AM EDTFlash Flood WarningRAHJohnston, Nash, Wilson3 hr
Sep 28, 8:19 AM EDTFlash Flood WarningRAHEdgecombe4 hr
Sep 28, 11:07 AM EDTFlash Flood WarningRAHJohnston, Wayne, Wilson2 hr
Sep 28, 11:07 AM EDTFlash Flood WarningRAHNash2 hr
Sep 28, 4:29 PM EDTFlash Flood WarningRAHEdgecombe, Johnston, Nash, Wayne, Wilson4 hr
Sep 28, 4:29 PM EDTFlash Flood WarningRAHSampson4 hr
Sep 28, 4:29 PM EDTFlash Flood WarningRAHWake4 hr
Sep 28, 5:27 PM EDTFlash Flood WarningRAHDurham, Orange3 hr

Nearby

Flash Flood Warnings in North Carolina, 1999Every flash flood warning in 1999

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.