Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 13, NWS Raleigh, NC

July 16, 2016Chatham County, Durham County, Orange County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Jul 16, 2016, 9:19 PM EDT for Chatham County, Durham County, Orange County, North Carolina. It was in force for 2 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 16, 2016, 9:19 PM EDT (01:19 UTC)
Expired: Jul 16, 2016, 11:45 PM EDT
In force: 2 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Chatham County, NC, Durham County, NC, Orange County, NC

The radar

The Raleigh/Durham radar (KRAX), 45 km from the middle of the area, began a volume at 01:22 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.

What was reported inside it

Time	Report	Where	Remark
Jul 16, 9:38 PM EDT	FLASH FLOOD	1 Ne Durham, NC	FLOODING CLOSED STREET JUST OFF DURHAM FREEWAY BETWEEN MANGUM STREET AND ROXBORO STREET, 4-5 FEET OF WATER FLOWING OVER THE ROAD.
Jul 16, 10:30 PM EDT	HEAVY RAIN 4	1 Nw Durham, NC	4.00 INCHES OF RAIN IN LAST 2.5 HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 1.3 hours before the alert went out and 98 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: 258 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1119 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

040 
WGUS52 KRAH 170119
FFWRAH
NCC037-063-135-170345-
/O.NEW.KRAH.FF.W.0013.160717T0119Z-160717T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
919 PM EDT SAT JUL 16 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN CHATHAM COUNTY IN CENTRAL NORTH CAROLINA...
  SOUTHEASTERN ORANGE COUNTY IN CENTRAL NORTH CAROLINA...
  DURHAM COUNTY IN CENTRAL NORTH CAROLINA...

* UNTIL 1145 PM EDT
  
* AT 919 PM EDT...DOPPLER RADAR INDICATED A SLOW MOVING THUNDERSTORM
  PRODUCING FLOODING ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN
  HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  DURHAM...CHAPEL HILL...CARRBORO...BETHESDA...GORMAN...
  ROLLINGVIEW MARINA...PARKWOOD...RESEARCH TRIANGLE...
  ENO RIVER STATE PARK AND FALLS LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3607 7875 3603 7875 3602 7874 3603 7872
      3601 7870 3596 7872 3592 7876 3593 7880
      3587 7883 3587 7891 3583 7892 3584 7910
      3605 7905 3607 7879

$$

PWB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:38 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Durham, Wake	52 min
Jul 16, 8:42 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Hoke, Moore, Scotland	64 min
Jul 16, 9:02 PM EDT	Special Weather Statement	RAH	Franklin	43 min
Jul 16, 9:08 PM EDT	Areal Flood Advisory	RAH	Franklin	112 min
Jul 16, 9:48 PM EDT	Flash Flood Warning	RAH	Wake	3 hr
Jul 16, 9:56 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Johnston, Sampson, Wayne	64 min
Jul 16, 10:14 PM EDT	Flash Flood Warning Emergency	RAH	Durham, Wake	3 hr
Jul 16, 10:37 PM EDT	Special Weather Statement	RAH	Edgecombe, Nash, Wilson	23 min
Jul 16, 10:49 PM EDT	Areal Flood Advisory	RAH	Edgecombe, Franklin, Johnston, Nash, Wayne, Wilson	3 hr
Jul 16, 11:29 PM EDT	Special Weather Statement	RAH	Edgecombe, Wilson	76 min
Jul 16, 11:58 PM EDT	Areal Flood Warning	RAH	Edgecombe, Nash, Wilson	9 hr
Jul 17, 12:19 AM EDT	Areal Flood Warning	RAH	Chatham, Durham, Franklin, Harnett, Johnston, Orange and 1 more	9 hr
Jul 17, 1:09 AM EDT	Special Weather Statement	RAH	Cumberland, Hoke, Sampson, Scotland	81 min
Jul 17, 8:45 AM EDT	Areal Flood Warning	RAH	Edgecombe	9 hr
Jul 17, 9:12 AM EDT	Areal Flood Warning	RAH	Wake	3 hr
Jul 17, 9:40 AM EDT	River Flood Warning	RAH	Johnston	26 hr
Jul 17, 4:19 PM EDT	River Flood Warning	RAH	Johnston	55 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.