Alert archive / North Carolina / Flash Flood Warnings in 2016

Flash Flood Warning 7, NWS Raleigh, NC

July 1, 2016Forsyth County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Jul 1, 2016, 1:02 AM EDT for Forsyth 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 1, 2016, 1:02 AM EDT (05:02 UTC)
Expired: Jul 1, 2016, 4:00 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

County Forsyth County, NC

The radar

The Roanoke radar (KFCX), 107 km from the middle of the area, began a volume at 05:03 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, 5.0 hours before the alert went out and 36 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: 918 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1104 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

747 
WGUS52 KRAH 010502
FFWRAH
NCC067-010800-
/O.NEW.KRAH.FF.W.0007.160701T0502Z-160701T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
102 AM EDT FRI JUL 1 2016

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 400 AM EDT
  
* AT 101 AM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN 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...BERMUDA RUN...
  LEWISVILLE...WALKERTOWN...RURAL HALL...BELEWS LAKE...
  BELEWS CREEK AND SEDGE GARDEN.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES ARE POSSIBLE IN
THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

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

&&

LAT...LON 3612 8044 3626 8038 3626 8004 3601 8005
      3603 8014 3603 8021 3600 8022 3600 8032
      3597 8039 3599 8042 3601 8042 3604 8045

$$

77

1 follow-up statement

615 
WGUS72 KRAH 010729
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
329 AM EDT FRI JUL 1 2016

NCC067-010739-
/O.CAN.KRAH.FF.W.0007.000000T0000Z-160701T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FORSYTH NC-
329 AM EDT FRI JUL 1 2016

...THE FLASH FLOOD WARNING FOR 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 3612 8044 3626 8038 3626 8004 3601 8005
      3603 8014 3603 8021 3600 8022 3600 8032
      3597 8039 3599 8042 3601 8042 3604 8045

$$

77

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:10 PM EDT	Severe Thunderstorm Warning	RAH	Richmond, Scotland	24 min
Jun 30, 8:37 PM EDT	Special Weather Statement	RAH	Hoke	53 min
Jun 30, 10:39 PM EDT	Special Weather Statement	RAH	Wake	36 min
Jun 30, 10:48 PM EDT	Areal Flood Advisory	RAH	Wake	3 hr
Jun 30, 11:15 PM EDT	Areal Flood Advisory	RAH	Forsyth	2 hr
Jul 1, 12:16 AM EDT	Special Weather Statement	RAH	Forsyth	59 min
Jul 1, 1:31 AM EDT	Special Weather Statement	RAH	Davidson	44 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.