Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 33, NWS Raleigh, NC

September 19, 2016Durham County, Granville County, Person County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 19, 2016, 12:21 AM EDT for Durham County, Granville County, Person 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 19, 2016, 12:21 AM EDT (04:21 UTC)
Expired: Sep 19, 2016, 3:15 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Durham County, NC, Granville County, NC, Person County, NC

The radar

The Raleigh/Durham radar (KRAX), 73 km from the middle of the area, began a volume at 04:25 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, 4.4 hours before the alert went out and 99 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: 223 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1268 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

803 
WGUS52 KRAH 190421
FFWRAH
NCC063-077-145-190715-
/O.NEW.KRAH.FF.W.0033.160919T0421Z-160919T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
1221 AM EDT MON SEP 19 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN PERSON COUNTY IN CENTRAL NORTH CAROLINA...
  SOUTHWESTERN GRANVILLE COUNTY IN CENTRAL NORTH CAROLINA...
  NORTHWESTERN DURHAM COUNTY IN CENTRAL NORTH CAROLINA...

* UNTIL 315 AM EDT
    
* AT 1220 AM EDT...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS
  PRODUCING VERY HEAVY RAIN ACROSS THE WARNED AREA. AS MUCH AS THREE
  TO FOUR INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CREEDMOOR...BUTNER...ROUGEMONT...STEM...LAKE BUTNER...
  LAKE MICHIE...BEREA...SURL...MORIAH AND BAHAMA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.  MOVE TO HIGHER GROUND.

&&

LAT...LON 3637 7863 3613 7866 3613 7897 3624 7895
      3624 7896 3638 7894

$$

22

1 follow-up statement

247 
WGUS72 KRAH 190642
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
242 AM EDT MON SEP 19 2016

NCC063-077-145-190651-
/O.CAN.KRAH.FF.W.0033.000000T0000Z-160919T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PERSON NC-GRANVILLE NC-DURHAM NC-
242 AM EDT MON SEP 19 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN PERSON...SOUTHWESTERN
GRANVILLE AND NORTHWESTERN DURHAM COUNTIES IS CANCELLED...

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

LAT...LON 3637 7863 3613 7866 3613 7897 3624 7895
      3624 7896 3638 7894

$$

22

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 9:20 PM EDT	Areal Flood Advisory	RAH	Durham, Granville, Orange, Person	3 hr
Sep 19, 12:00 AM EDT	Areal Flood Advisory	RAH	Durham, Granville, Person	3 hr
Sep 19, 7:30 AM EDT	Special Weather Statement	RAH	Alamance, Guilford, Montgomery, Randolph	90 min
Sep 19, 9:14 AM EDT	Areal Flood Advisory	RAH	Alamance, Orange, Person	2 hr
Sep 19, 10:27 AM EDT	Areal Flood Advisory	RAH	Durham	2 hr
Sep 19, 10:59 AM EDT	Special Weather Statement	RAH	Harnett, Wake	76 min
Sep 19, 11:07 AM EDT	Areal Flood Advisory	RAH	Wake	113 min
Sep 19, 1:12 PM EDT	Special Weather Statement	RAH	Cumberland, Edgecombe, Halifax, Johnston, Nash, Sampson and 2 more	78 min
Sep 19, 2:09 PM EDT	Areal Flood Advisory	RAH	Johnston, Sampson, Wayne, Wilson	111 min

Nearby

Flash Flood Warnings in North Carolina, 2016 Every 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.