Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 34, NWS Raleigh, NC

September 26, 2016Randolph County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 26, 2016, 11:07 PM EDT for Randolph County, North 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 outline as issued.

The facts

Issued
Sep 26, 2016, 11:07 PM EDT (03:07 UTC)
Expired
Sep 27, 2016, 2:00 AM EDT
In force
3 hr
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

County Randolph County, NC

The radar

The Raleigh/Durham radar (KRAX), 122 km from the middle of the area, began a volume at 03:08 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, 3.1 hours before the alert went out and 41 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 2016-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2016-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 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
4 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
497 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

668 
WGUS52 KRAH 270307
FFWRAH
NCC151-270600-
/O.NEW.KRAH.FF.W.0034.160927T0307Z-160927T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
1107 PM EDT MON SEP 26 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  RANDOLPH COUNTY IN CENTRAL NORTH CAROLINA...

* UNTIL 200 AM EDT
  
* AT 1104 PM EDT...DOPPLER RADAR INDICATED A SLOW MOVING
  THUNDERSTORM PRODUCING FLOODING ACROSS THE WARNED AREA. UP TO TWO
  TO TWO AND A HALF INCHES OF RAIN HAVE LIKELY FALLEN NEAR ASHEBORO
  SINCE 9 PM.  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO ONE AND A HALF INCHES ARE
POSSIBLE IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

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

&&

LAT...LON 3583 8000 3589 7955 3551 7957 3551 8006

$$

WSS
2 follow-up statements
469 
WGUS72 KRAH 270413
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
1213 AM EDT TUE SEP 27 2016

NCC151-270600-
/O.CON.KRAH.FF.W.0034.000000T0000Z-160927T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RANDOLPH NC-
1213 AM EDT TUE SEP 27 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM EDT FOR
RANDOLPH COUNTY...

AT 1212 AM EDT...DOPPLER RADAR INDICATED THAT THUNDERSTORMS
PRODUCING HEAVY RAIN HAVE MOVED SOUTH OF THE WARNED AREA. UP TO TWO
INCHES OF RAIN HAVE ALREADY FALLEN NEAR ASHEBORO. MODERATE RAINFALL
EXPECTED TO CONTINUE THROUGH 1 AM THEN TAPER OFF. FLASH FLOODING IS
EXPECTED TO BEGIN SHORTLY.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

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

&&

LAT...LON 3583 8000 3589 7955 3551 7957 3551 8006

$$

WSS
500 
WGUS72 KRAH 270500
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
100 AM EDT TUE SEP 27 2016

NCC151-270509-
/O.CAN.KRAH.FF.W.0034.000000T0000Z-160927T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RANDOLPH NC-
100 AM EDT TUE SEP 27 2016

...THE FLASH FLOOD WARNING FOR RANDOLPH COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PERIODS OF MODERATE RAINFALL WILL CONTINUE ACROSS RANDOLPH
COUNTY THROUGH 2 AM. 

LAT...LON 3583 8000 3589 7955 3551 7957 3551 8006

$$

WSS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 26, 8:16 PM EDTSpecial Weather StatementRAHAlamance, Randolph89 min
Sep 26, 8:59 PM EDTAreal Flood AdvisoryRAHDavidson, Randolph3 hr
Sep 27, 3:31 PM EDTSpecial Weather StatementRAHHarnett44 min
Sep 27, 3:41 PM EDTSpecial Weather StatementRAHSampson49 min
Sep 27, 7:49 PM EDTSpecial Weather StatementRAHRandolph41 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.