Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 32, NWS Raleigh, NC

August 27, 2016Forsyth County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Aug 27, 2016, 6:11 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 27, 2016, 6:11 PM EDT (22:11 UTC)
Expired: Aug 27, 2016, 8:15 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), 110 km from the middle of the area, began a volume at 22:14 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 12:00Z, 10.2 hours before the alert went out and 34 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: 1406 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

950 
WGUS52 KRAH 272211
FFWRAH
NCC067-280015-
/O.NEW.KRAH.FF.W.0032.160827T2211Z-160828T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
611 PM EDT SAT AUG 27 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 815 PM EDT

* AT 611 PM EDT...DOPPLER RADAR INDICATED TRAINING THUNDERSTORMS THAT
  WERE CONTINUOUSLY REDEVELOPING 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...
  WINSTON-SALEM...KERNERSVILLE...CLEMMONS...
  LEWISVILLE AND SEDGE GARDEN.

ADDITIONAL RAINFALL AMOUNTS 1 TO 2 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.

&&

LAT...LON 3613 8044 3613 8004 3601 8005 3603 8014
      3603 8021 3600 8022 3600 8032 3599 8033
      3599 8035 3597 8040 3598 8041

$$

23

1 follow-up statement

288 
WGUS72 KRAH 272253
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
653 PM EDT SAT AUG 27 2016

NCC067-272302-
/O.CAN.KRAH.FF.W.0032.000000T0000Z-160828T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FORSYTH NC-
653 PM EDT SAT AUG 27 2016

...THE FLASH FLOOD WARNING FOR SOUTHERN FORSYTH 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 3613 8044 3613 8004 3601 8005 3603 8014
      3603 8021 3600 8022 3600 8032 3599 8033
      3599 8035 3597 8040 3598 8041

$$

23

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 1:37 PM EDT	Special Weather Statement	RAH	Johnston	38 min
Aug 27, 1:42 PM EDT	Special Weather Statement	RAH	Guilford	33 min
Aug 27, 1:45 PM EDT	Special Weather Statement	RAH	Lee	45 min
Aug 27, 2:42 PM EDT	Special Weather Statement	RAH	Wake	33 min
Aug 27, 2:44 PM EDT	Special Weather Statement	RAH	Davidson	46 min
Aug 27, 2:55 PM EDT	Severe Thunderstorm Warning	RAH	Wake	35 min
Aug 27, 3:10 PM EDT	Special Weather Statement	RAH	Moore	50 min
Aug 27, 3:28 PM EDT	Special Weather Statement	RAH	Person	32 min
Aug 27, 3:36 PM EDT	Special Weather Statement	RAH	Stanly	24 min
Aug 27, 3:48 PM EDT	Special Weather Statement	RAH	Moore	57 min
Aug 27, 4:02 PM EDT	Special Weather Statement	RAH	Stanly	43 min
Aug 27, 4:25 PM EDT	Special Weather Statement	RAH	Alamance, Orange	50 min
Aug 27, 4:32 PM EDT	Severe Thunderstorm Warning	RAH	Montgomery, Stanly	58 min
Aug 27, 5:11 PM EDT	Severe Thunderstorm Warning	RAH	Guilford	49 min
Aug 27, 5:13 PM EDT	Severe Thunderstorm Warning	RAH	Anson, Stanly	77 min
Aug 27, 5:16 PM EDT	Severe Thunderstorm Warning	RAH	Forsyth	59 min
Aug 27, 5:20 PM EDT	Special Weather Statement	RAH	Richmond, Scotland	40 min
Aug 27, 5:28 PM EDT	Flash Flood Warning	RAH	Guilford	3 hr
Aug 27, 5:58 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Guilford, Randolph	31 min
Aug 27, 6:12 PM EDT	Special Weather Statement	RAH	Cumberland	48 min
Aug 27, 6:18 PM EDT	Special Weather Statement	RAH	Richmond	27 min
Aug 27, 6:34 PM EDT	Special Weather Statement	RAH	Anson	41 min
Aug 27, 6:45 PM EDT	Special Weather Statement	RAH	Harnett	45 min
Aug 27, 7:29 PM EDT	Special Weather Statement	RAH	Cumberland, Hoke	61 min
Aug 27, 7:44 PM EDT	Severe Thunderstorm Warning	RAH	Hoke, Moore, Scotland	46 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.