Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 29, NWS Raleigh, NC

August 9, 2016Forsyth County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 9, 2016, 8:44 PM EDT for Forsyth County, North Carolina. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 9, 2016, 8:44 PM EDT (00:44 UTC)
Expired
Aug 9, 2016, 10:45 PM EDT
In force
2 hr
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

County Forsyth County, NC

The radar

The Roanoke radar (KFCX), 94 km from the middle of the area, began a volume at 00:43 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.7 hours before the alert went out and 29 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, Greensboro/Hi Pt, NC at 00:00Z on 2016-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 583 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, Greensboro/Hi Pt, NC at 00:00Z on 2016-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
583 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
1073 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

917 
WGUS52 KRAH 100044
FFWRAH
NCC067-100245-
/O.NEW.KRAH.FF.W.0029.160810T0044Z-160810T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
844 PM EDT TUE AUG 9 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN FORSYTH COUNTY IN CENTRAL NORTH CAROLINA...

* UNTIL 1045 PM EDT
  
* AT 842 PM EDT...DOPPLER RADAR INDICATED A CLUSTER OF THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF
  RAIN HAVE ALREADY FALLEN SINCE 715 PM. FLASH FLOODING IS EXPECTED
  TO BEGIN SHORTLY. WATER LEVELS ARE LIKELY RISING RAPIDLY ALONG
  MILL CREEK, BUFFALO CREEK AND NEATMAN CREEK.

ADDITIONAL RAINFALL AMOUNTS OF AN INCH ARE POSSIBLE IN THE WARNED
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING OF
CREEKS AND STREAMS...ROADS...LOW LYING AND POOR DRAINAGE AREAS. DO
NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. MANY
ROADS AND INTERSECTIONS IN THE AREA WILL QUICKLY FLOOD. WHEN
ENCOUNTERING FLOODED ROADS...TURN AROUND...DONT DROWN.

&&

LAT...LON 3626 8033 3625 8004 3603 8004 3609 8027

$$

WSS
2 follow-up statements
527 
WGUS72 KRAH 100155
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
955 PM EDT TUE AUG 9 2016

NCC067-100245-
/O.CON.KRAH.FF.W.0029.000000T0000Z-160810T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FORSYTH NC-
955 PM EDT TUE AUG 9 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT FOR
NORTHEASTERN FORSYTH COUNTY...

AT 951 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN HAVE EXITED THE REGION. THESE STORMS LIKELY DUMPED A
LITTLE OVER TWO INCHES OF RAIN NEAR STANLEYVILLE AND WALKERTOWN.
WATER LEVELS WERE LIKELY STILL RISING ALONG MILL CREEK...BUFFALO
CREEK...AND NEATMAN CREEK. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
WINSTON-SALEM...KERNERSVILLE...WALKERTOWN...RURAL HALL...
BELEWS CREEK...SEDGE GARDEN AND STANLEYVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3626 8033 3625 8004 3603 8004 3609 8027

$$

WSS
614 
WGUS72 KRAH 100232
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
1032 PM EDT TUE AUG 9 2016

NCC067-100241-
/O.CAN.KRAH.FF.W.0029.000000T0000Z-160810T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FORSYTH NC-
1032 PM EDT TUE AUG 9 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN FORSYTH COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT.

LAT...LON 3626 8033 3625 8004 3603 8004 3609 8027

$$

WSS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 8:20 PM EDTAreal Flood AdvisoryRAHDavidson, Forsyth, Guilford115 min
Aug 10, 6:06 PM EDTAreal Flood AdvisoryRAHAnson, Richmond114 min

Nearby

Flash Flood Warnings in North Carolina, 2016Every flash flood warning in 2016

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.