Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 17, NWS Raleigh, NC

July 27, 2016Warren County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Jul 27, 2016, 7:40 PM EDT for Warren 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: Jul 27, 2016, 7:40 PM EDT (23:40 UTC)
Expired: Jul 27, 2016, 10:45 PM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

County Warren County, NC

The radar

The Raleigh/Durham radar (KRAX), 85 km from the middle of the area, began a volume at 23:44 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

Roanoke, VA (KRNK), launched 12:00Z, 11.7 hours before the alert went out and 153 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: 783 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

618 
WGUS52 KRAH 272340
FFWRAH
NCC185-280245-
/O.NEW.KRAH.FF.W.0017.160727T2340Z-160728T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
740 PM EDT WED JUL 27 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 1045 PM EDT
    
* AT 739 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE
  ALREADY FALLEN. THIS AREA ALSO SAW UP TO FOUR INCHES OF  RAINFALL
  YESTERDAY. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WARRENTON...NORLINA AND AFTON. 

ADDITIONAL RAINFALL AMOUNTS OF 1-3 INCHES 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.

FLASH FLOODING IS EXTREMELY DANGEROUS. NUMEROUS ROADS AND LOW LYING
AREAS WILL QUICKLY FLOOD. FLOOD WATERS WILL ALSO THREATEN SOME HOMES
AND BUSINESSES. IF YOU ARE EXPERIENCING FLOODING OR LIVE IN A FLOOD
PRONE AREA...MOVE TO HIGHER GROUND.

&&

LAT...LON 3641 7801 3626 7808 3633 7824 3638 7823
      3647 7821

$$

KDS

1 follow-up statement

670 
WGUS72 KRAH 280121
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
921 PM EDT WED JUL 27 2016

NCC185-280130-
/O.CAN.KRAH.FF.W.0017.000000T0000Z-160728T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WARREN NC-
921 PM EDT WED JUL 27 2016

...THE FLASH FLOOD WARNING FOR CENTRAL WARREN COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3641 7801 3626 7808 3633 7824 3638 7823
      3647 7821

$$

KDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:06 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Wake	39 min
Jul 26, 8:45 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Harnett, Lee, Wake	45 min
Jul 26, 9:39 PM EDT	Special Weather Statement	RAH	Wake	66 min
Jul 26, 9:43 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Durham, Orange, Wake	47 min
Jul 26, 10:06 PM EDT	Areal Flood Advisory	RAH	Chatham, Durham, Orange, Wake	114 min
Jul 26, 11:26 PM EDT	Special Weather Statement	RAH	Granville, Person	64 min
Jul 27, 12:25 AM EDT	Special Weather Statement	RAH	Vance, Warren	65 min
Jul 27, 2:51 PM EDT	Special Weather Statement	RAH	Chatham, Harnett, Lee, Randolph	84 min
Jul 27, 2:55 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Harnett, Lee	38 min
Jul 27, 3:42 PM EDT	Heat Advisory	RAH	Alamance, Anson, Chatham, Cumberland, Davidson, Durham and 25 more	28 hr
Jul 27, 4:06 PM EDT	Special Weather Statement	RAH	Harnett	39 min
Jul 27, 5:56 PM EDT	Special Weather Statement	RAH	Granville, Halifax, Person, Vance, Warren	34 min
Jul 27, 6:16 PM EDT	Special Weather Statement	RAH	Forsyth, Guilford	29 min
Jul 27, 6:19 PM EDT	Severe Thunderstorm Warning	RAH	Person	41 min
Jul 27, 6:32 PM EDT	Severe Thunderstorm Warning	RAH	Forsyth, Guilford	58 min
Jul 27, 6:34 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Orange, Person	41 min
Jul 27, 6:42 PM EDT	Areal Flood Advisory	RAH	Person	3 hr
Jul 27, 6:47 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Vance	43 min
Jul 27, 6:55 PM EDT	Special Weather Statement	RAH	Warren	35 min
Jul 27, 7:05 PM EDT	Areal Flood Advisory	RAH	Forsyth, Guilford	115 min
Jul 27, 7:16 PM EDT	Special Weather Statement	RAH	Durham, Granville, Orange	29 min
Jul 27, 7:32 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth, Guilford, Randolph	58 min
Jul 27, 7:39 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Vance, Warren	51 min
Jul 27, 7:43 PM EDT	Special Weather Statement	RAH	Alamance	47 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.