Alert archive / North Carolina / Flash Flood Warnings in 2012

Flash Flood Warning 42, NWS Raleigh, NC

September 3, 2012Guilford County, North Carolina

NWS Raleigh, NC issued this flash flood warning at Sep 3, 2012, 2:53 PM EDT for Guilford County, North Carolina. It was in force for 3 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
Sep 3, 2012, 2:53 PM EDT (18:53 UTC)
Expired
Sep 3, 2012, 5:45 PM EDT
In force
3 hr
Issued by
NWS Raleigh, NC
Area
Storm-based polygon
Flood severity
None

County Guilford County, NC

The radar

The Roanoke radar (KFCX), 113 km from the middle of the area, began a volume at 18:52 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

TimeReportWhereRemark
Sep 3, 3:37 PM EDTFLASH FLOOD4 Sse Greensboro, NCROAD CLOSED DUE TO FLASH FLOODING AT INTERSECTION OF RANDLEMAN RD AND CORLISS ST
Sep 3, 4:23 PM EDTFLASH FLOOD2 E Pleasant Garden, NCROAD CLOSED DUE TO FLASH FLOODING AT INTERSECTION OF NEELLEY RD AND TABERNACLE CHURCH RD. STREET COMPLETELY FLOODED AND IMPASSIBLE.

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 12:00Z, 6.9 hours before the alert went out and 10 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2012-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 576 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2012-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
576 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
801 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

656 
WGUS52 KRAH 031853
FFWRAH
NCC081-032145-
/O.NEW.KRAH.FF.W.0042.120903T1853Z-120903T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
253 PM EDT MON SEP 3 2012

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 545 PM EDT

* AT 247 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAIN PRODUCING FLOODING OVER GUILFORD
  COUNTY. DOPPLER RADAR ESTIMATED THAT OVER AN INCH OF RAIN HAS      
  FALLEN OVER GREENSBORO AND VERY HEAVY RAINFALL IS MOVING INTO THE  
  CITY.

* LOCATIONS THREATENED WITH FLOODING INCLUDE MCLEANSVILLE...HIGH
  POINT AND GREENSBORO.

AN ADDITIONAL 2 TO 3 INCHES OF RAINFALL ARE STILL POSSIBLE RESULTING 
IN ADDITIONAL FLOODING.

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.

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY CALLING...
1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW ENFORCEMENT
AGENCY.

&&

LAT...LON 3625 7954 3590 7954 3592 8004 3593 8005
      3626 8003

$$

10
2 follow-up statements
840 
WGUS72 KRAH 032046
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
446 PM EDT MON SEP 3 2012

NCC081-032145-
/O.CON.KRAH.FF.W.0042.000000T0000Z-120903T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUILFORD NC-
446 PM EDT MON SEP 3 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR
GUILFORD COUNTY...

AT 437 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED 
THAT 2 TO 3 INCHES OF RAIN HAS FALLEN OVER GUILFORD COUNTY. ALTHOUGH 
THE HEAVIEST RAIN HAS MOVED OUT OF THE AREA...WATER ON SOUTH BUFFALO 
CREEK AND RYAN CREEK CONTINUES TO RISE.

THE INTERSECTION OF NEELLEY RD AND TABERNACLE CHURCH RD WAS ALSO
EXPERIENCING FLOODING.

LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO 
MCLEANSVILLE AND GREENSBORO.

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.

PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY CALLING...
1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW ENFORCEMENT
AGENCY.

&&

LAT...LON 3625 7954 3590 7954 3592 8004 3593 8005
      3626 8003

$$

10
888 
WGUS72 KRAH 032140
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
540 PM EDT MON SEP 3 2012

NCC081-032149-
/O.EXP.KRAH.FF.W.0042.000000T0000Z-120903T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GUILFORD NC-
540 PM EDT MON SEP 3 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 545 PM EDT FOR GUILFORD
COUNTY...

AT 537 PM EDT...THE THUNDERSTORMS THAT WERE PRODUCING VERY HEAVY 
RAIN OVER GUILFORD COUNTY HAVE WEAKENED AND MOVED OUT OF THE AREA 
AND THE FLOODING THREAT HAS ENDED. BE CAUTIOUS WHILE DRIVING... 
ESPECIALLY NEAR SMALL CREEKS AND STREAMS WHERE WATER MAY STILL BE 
HIGH.

LAT...LON 3625 7954 3590 7954 3592 8004 3593 8005
      3626 8003

$$

10

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 8:20 PM EDTSpecial Weather StatementRAHAlamance, Orange85 min
Sep 2, 8:28 PM EDTSevere Thunderstorm WarningRAHAlamance, Durham, Orange, Person53 min
Sep 2, 8:42 PM EDTTornado WarningRAHDurham, Orange, Person33 min
Sep 2, 9:20 PM EDTSpecial Weather StatementRAHGranville, Vance55 min
Sep 2, 9:43 PM EDTSpecial Weather StatementRAHChatham, Durham, Lee, Moore, Orange62 min
Sep 2, 10:26 PM EDTSpecial Weather StatementRAHLee, Wake94 min
Sep 2, 11:09 PM EDTSpecial Weather StatementRAHFranklin, Granville, Nash, Wake51 min
Sep 2, 11:42 PM EDTAreal Flood AdvisoryRAHWake108 min
Sep 3, 2:35 AM EDTAreal Flood AdvisoryRAHMontgomery, Richmond99 min
Sep 3, 1:00 PM EDTSpecial Weather StatementRAHDavidson, Forsyth, Guilford, Randolph90 min
Sep 3, 1:01 PM EDTFlash Flood WarningRAHForsyth3 hr
Sep 3, 1:06 PM EDTSpecial Weather StatementRAHAnson, Montgomery, Stanly84 min
Sep 3, 1:09 PM EDTAreal Flood AdvisoryRAHStanly3 hr
Sep 3, 1:18 PM EDTFlash Flood WarningRAHStanly3 hr
Sep 3, 1:21 PM EDTSevere Thunderstorm WarningRAHForsyth, Guilford39 min
Sep 3, 1:27 PM EDTSevere Thunderstorm WarningRAHMontgomery, Randolph, Stanly48 min
Sep 3, 2:23 PM EDTAreal Flood AdvisoryRAHGuilford3 hr
Sep 3, 2:35 PM EDTSpecial Weather StatementRAHAnson, Montgomery, Moore, Richmond, Stanly85 min
Sep 3, 2:38 PM EDTSpecial Weather StatementRAHDavidson, Forsyth, Guilford, Randolph97 min
Sep 3, 3:34 PM EDTAreal Flood AdvisoryRAHRandolph2 hr
Sep 3, 3:59 PM EDTSpecial Weather StatementRAHHoke, Lee, Moore, Richmond, Scotland91 min
Sep 3, 4:03 PM EDTSpecial Weather StatementRAHAlamance, Chatham, Orange87 min
Sep 3, 4:14 PM EDTFlash Flood WarningRAHStanly2 hr
Sep 3, 4:17 PM EDTSevere Thunderstorm WarningRAHAlamance, Orange58 min
Sep 3, 4:52 PM EDTAreal Flood AdvisoryRAHAlamance, Orange2 hr
Sep 3, 4:57 PM EDTSevere Thunderstorm WarningRAHRichmond, Scotland48 min
Sep 3, 5:40 PM EDTAreal Flood AdvisoryRAHDurham, Orange3 hr
Sep 3, 5:41 PM EDTSpecial Weather StatementRAHWake64 min
Sep 3, 5:49 PM EDTSpecial Weather StatementRAHWilson56 min
Sep 3, 6:21 PM EDTSpecial Weather StatementRAHDurham54 min
Sep 3, 7:41 PM EDTSpecial Weather StatementRAHWake64 min

Nearby

Flash Flood Warnings in North Carolina, 2012Every flash flood warning in 2012

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.