Alert archive / North Carolina / Flash Flood Warnings in 2011

Flash Flood Warning 5, NWS Raleigh, NC

May 27, 20114 counties in North Carolina

NWS Raleigh, NC issued this flash flood warning at May 27, 2011, 1:35 PM EDT for 4 counties in North Carolina. It was in force for 3 hr. 13 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: May 27, 2011, 1:35 PM EDT (17:35 UTC)
Expired: May 27, 2011, 4:30 PM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

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

The radar

The Raleigh/Durham radar (KRAX), 44 km from the middle of the area, began a volume at 17:37 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
May 27, 1:40 PM EDT	HEAVY RAIN 2.41	1 N Chapel Hill, NC	TRAINED SPOTTER IN CHAPEL HILL REPORTED 2.41 INCHES OF RAINFALL IN THE LAST HOUR.
May 27, 1:46 PM EDT	FLASH FLOOD	1 Wnw Pittsboro, NC	CHATHAM CO 911 RECEIVED REPORT OF FLOODING ACROSS ROADWAY AT 591 W SALISBURY ST IN PITTSBORO
May 27, 1:59 PM EDT	FLASH FLOOD	1 Ne Parkwood, NC	6 TO 12 INCHES OF RAIN ON SEDWICK ROAD IN DURHAM.
May 27, 2:00 PM EDT	FLASH FLOOD	1 E Carrboro, NC	FLOODING AT W FRANKLIN ST AND MALLATTE ST... ROADS REPORTED TO BE CLEARED AT 345 PM.
May 27, 2:00 PM EDT	FLASH FLOOD	1 Se Carrboro, NC	FLOODING ON THE ROAD...VEHICLES STALLING OUT IN WATER. FLOODING STILL OCCURRING AT 345 PM.
May 27, 2:05 PM EDT	FLASH FLOOD	1 E Chapel Hill, NC	FLOODING ON S ESTES DRIVE BETWEEN WILLOW DRIVE AND FORDHAM BOULEVARD. ROADS REPORTED TO BE CLEARED AT 345 PM.
May 27, 2:06 PM EDT	FLASH FLOOD	1 Wnw Pittsboro, NC	CHATHAM CO 911 RECEIVED REPORT OF FLOODING ACROSS ROADWAY AT 591 W SALISBURY ST IN PITTSBORO
May 27, 2:21 PM EDT	FLASH FLOOD	1 N Pittsboro, NC	CHATHAM CO 911 RECEIVED REPORT OF FLOODING ACROSS ROADWAY AT 1500 HILLSBORO IN PITTSBORO
May 27, 2:21 PM EDT	FLASH FLOOD	Pittsboro, NC	CHATHAM CO 911 HAS RECEIVED SEVERAL REPORTS OF FLOODING OVER ROADWAYS WITHIN THE TOWN OF PITTSBORO.
May 27, 2:40 PM EDT	FLASH FLOOD	1 Ne Durham, NC	THIRD FORK CREEK IS OUT OF ITS BANKS. WATER FROM THE CREEK IS COVERING UNIVERSITY DRIVE.
May 27, 2:40 PM EDT	FLASH FLOOD	1 Nnw Chapel Hill, NC	THIRD FORK CREEK IS OUT OF ITS BANKS. WATER FROM THE CREEK IS COVERING UNIVERSITY DRIVE.
May 27, 2:40 PM EDT	FLASH FLOOD	Chapel Hill, NC	ROAD FLOODING... W. FRANKLIN AND MALLETTE ST. 250 S. ESTES. S. GREENSBORO AND RANDLE.
May 27, 4:30 PM EDT	FLASH FLOOD	1 Se Carrboro, NC	FLOODING ON SOUTH GREENSBORO STREET HAS ABATED. ROAD REOPENED AT 430 PM.

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, 5.6 hours before the alert went out and 95 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: 31 J/kg
Mixed-layer CIN: -292 J/kg
Mixed-layer LCL: 831 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 106 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.

456 
WGUS52 KRAH 271735
FFWRAH
NCC037-063-077-135-272030-
/O.NEW.KRAH.FF.W.0005.110527T1735Z-110527T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
135 PM EDT FRI MAY 27 2011

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

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

* UNTIL 430 PM EDT

* AT 128 PM EDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY
  HEAVY RAIN PRODUCING FLOODING OVER ORANGE...SOUTHERN GRANVILLE...
  DURHAM AND EASTERN CHATHAM COUNTIES. DOPPLER RADAR ESTIMATED       
  THAT BETWEEN 2 AND 4 INCHES OF RAIN HAS FALLLEN OVER PARTS OF THE  
  AREA DURING THE PAST 2 HOURS. SPOTTERS REPORTS CREEKS AND STREAMS  
  RAPIDLY RISING IN DURHAM AND CHAPEL HILL.

* LOCATIONS THREATENED WITH FLOODING INCLUDE ROUGEMONT...PITTSBORO...
  HILLSBOROUGH...GOLDSTON...DURHAM...CREEDMOOR...CHAPEL HILL...
  CARRBORO AND BUTNER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
AS LITTLE AS 6 INCHES OF WATER CAN CAUSE YOU TO LOSE CONTROL OF YOUR
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES
INCLUDING SPORT UTILITY VEHICLES AND PICKUP TRUCKS. 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 7851 3617 7850 3609 7854 3603 7854
      3607 7868 3607 7875 3595 7873 3592 7878
      3593 7880 3586 7886 3586 7891 3573 7895
      3565 7900 3562 7909 3562 7914 3558 7919
      3553 7940 3585 7924 3624 7924

$$

BLAES

3 follow-up statements

780 
WGUS72 KRAH 271807
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
207 PM EDT FRI MAY 27 2011

NCC037-063-077-135-272030-
/O.CON.KRAH.FF.W.0005.000000T0000Z-110527T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHATHAM NC-DURHAM NC-GRANVILLE NC-ORANGE NC-
207 PM EDT FRI MAY 27 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
ORANGE...SOUTHERN GRANVILLE...DURHAM AND EASTERN CHATHAM COUNTIES...

AT 201 PM EDT...LOCAL LAW ENFORCEMENT REPORTED THUNDERSTORMS WITH
VERY HEAVY RAIN OVER ORANGE...SOUTHERN GRANVILLE...DURHAM AND EASTERN
CHATHAM COUNTIES. DOPPLER RADAR ESTIMATED THAT BETWEEN 2 AND 5 
INCHES OF RAIN HAS FALLEN IN THE PAST 3 HOURS. 

NUMEROUS THUNDERSTORMS WITH HEAVY RAIN IS EXPECTED TO MOVE ACROSS 
THE WARNING AREA. STREAM ANS CREEKS CONTINUE TO RISE AND SPILL INTO 
ROADS. THE HEAVIEST RAIN AND GREATEST POTENTIAL FOR FLOODING EXISTS 
ACROSS SOUTHERN ORANGE AND EASTERN CHATHAM COUNTY. 

LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO
ROUGEMONT...HILLSBOROUGH...DURHAM...CREEDMOOR...CHAPEL HILL...
CARRBORO AND BUTNER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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 7851 3617 7850 3609 7854 3603 7854
      3607 7868 3607 7875 3595 7873 3592 7878
      3593 7880 3586 7886 3586 7891 3573 7895
      3565 7900 3562 7909 3562 7914 3558 7919
      3553 7940 3585 7924 3624 7924

$$

BLAES

943 
WGUS72 KRAH 271824
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
224 PM EDT FRI MAY 27 2011

NCC037-063-077-135-272030-
/O.CON.KRAH.FF.W.0005.000000T0000Z-110527T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHATHAM NC-DURHAM NC-GRANVILLE NC-ORANGE NC-
224 PM EDT FRI MAY 27 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
ORANGE...SOUTHERN GRANVILLE...DURHAM AND EASTERN CHATHAM COUNTIES...

AT 219 PM EDT...LOCAL LAW ENFORCEMENT REPORTED THUNDERSTORMS WITH
VERY HEAVY RAIN OVER ORANGE...SOUTHERN GRANVILLE...DURHAM AND EASTERN
CHATHAM COUNTIES. DOPPLER RADAR ESTIMATED THAT BETWEEN 2 AND 5 
INCHES OF RAIN HAS FALLEN OVER PARTS OF THE WARNED AREA. 

LAW ENFORCEMENT OFFICIALS REPORTS ROADS CLOSED NEAR EASTGATE 
SHOPPING CENTER IN CHAPEL HILL AND ROADS FLOODED NEAR HIGHWAY 55/54 
NEAR DURHAM. 

LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO
ROUGEMONT...HILLSBOROUGH...DURHAM...CREEDMOOR...CHAPEL HILL...
CARRBORO AND BUTNER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
AS LITTLE AS 6 INCHES OF WATER CAN CAUSE YOU TO LOSE CONTROL OF YOUR
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES
INCLUDING SPORT UTILITY VEHICLES AND PICKUP TRUCKS. 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT FRIDAY
EVENING FOR CENTRAL NORTH CAROLINA.

&&

LAT...LON 3625 7851 3617 7850 3609 7854 3603 7854
      3607 7868 3607 7875 3595 7873 3592 7878
      3593 7880 3586 7886 3586 7891 3573 7895
      3565 7900 3562 7909 3562 7914 3558 7919
      3553 7940 3585 7924 3624 7924

$$

BLAES

991 
WGUS72 KRAH 271853
FFSRAH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
253 PM EDT FRI MAY 27 2011

NCC037-063-077-135-272030-
/O.CON.KRAH.FF.W.0005.000000T0000Z-110527T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHATHAM NC-DURHAM NC-GRANVILLE NC-ORANGE NC-
253 PM EDT FRI MAY 27 2011

...DANGEROUS FLASH FLOODING WILL CONTINUE ACROSS PORTIONS OF  
ORANGE... SOUTHERN GRANVILLE...DURHAM AND EASTERN CHATHAM COUNTIES...

AT 246 PM EDT...LOCAL LAW ENFORCEMENT REPORTED THUNDERSTORMS WITH 
VERY HEAVY RAIN PRODUCING FLASH FLOODING OVER ORANGE...DURHAM AND 
EASTERN CHATHAM COUNTIES. DOPPLER RADAR ESTIMATED THAT UP TO 6 
INCHES OF RAIN HAS FALLEN ACROSS PORTIONS OF ORANGE AND DURHAM 
COUNTIES. 

LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO 
ROUGEMONT...HILLSBOROUGH...DURHAM...CREEDMOOR...CHAPEL 
HILL...CARRBORO AND BUTNER

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY DANGEROUS FLASH FLOODING IS OCCURRING ACROSS THE AREA. DO NOT
ATTEMPT TO TRAVEL UNLESS YOU MUST DO SO TO ESCAPE THE FLOODING OR ARE
UNDER AN EVACUATION ORDER. IF YOU ARE IN A LOW LYING AREA...ALONG A
CREEK OR STREAM...OR IN AN AREA EXPERIENCING FLOODING...TAKE ACTION
NOW TO PROTECT YOUR LIFE. MOVE TO HIGHER GROUND IMMEDIATELY.

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 7851 3617 7850 3609 7854 3603 7854
      3607 7868 3607 7875 3595 7873 3592 7878
      3593 7880 3586 7886 3586 7891 3573 7895
      3565 7900 3562 7909 3562 7914 3558 7919
      3553 7940 3585 7924 3624 7924

$$

BLAES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 10:59 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth	61 min
May 26, 11:18 PM EDT	Special Weather Statement	RAH	Guilford, Montgomery, Randolph, Stanly	42 min
May 26, 11:30 PM EDT	Severe Thunderstorm Warning	RAH	Guilford, Randolph	27 min
May 26, 11:47 PM EDT	Special Weather Statement	RAH	Alamance, Chatham, Lee, Montgomery, Moore, Orange	43 min
May 27, 1:48 AM EDT	Special Weather Statement	RAH	Anson	57 min
May 27, 11:25 AM EDT	Special Weather Statement	RAH	Alamance, Anson, Chatham, Cumberland, Durham, Franklin and 15 more	90 min
May 27, 11:50 AM EDT	Special Weather Statement	RAH	Durham	40 min
May 27, 11:56 AM EDT	Areal Flood Advisory	RAH	Durham, Granville	94 min
May 27, 12:00 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Wake	45 min
May 27, 12:30 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Granville, Wake	45 min
May 27, 12:36 PM EDT	Areal Flood Advisory	RAH	Chatham	84 min
May 27, 12:43 PM EDT	Areal Flood Advisory	RAH	Anson, Richmond	107 min
May 27, 12:52 PM EDT	Special Weather Statement	RAH	Anson, Hoke, Montgomery, Moore, Richmond, Scotland	83 min
May 27, 12:58 PM EDT	Special Weather Statement	RAH	Durham	62 min
May 27, 1:14 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Vance	61 min
May 27, 1:23 PM EDT	Areal Flood Advisory	RAH	Hoke, Moore, Scotland	3 hr
May 27, 1:25 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Durham, Orange	57 min
May 27, 1:26 PM EDT	Areal Flood Advisory	RAH	Chatham, Durham, Granville, Orange	3 hr
May 27, 1:33 PM EDT	Special Weather Statement	RAH	Granville	27 min
May 27, 1:43 PM EDT	Special Weather Statement	RAH	Davidson, Forsyth, Guilford	92 min
May 27, 1:52 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth, Guilford	46 min
May 27, 1:59 PM EDT	Severe Thunderstorm Warning	RAH	Chatham, Durham, Wake	61 min
May 27, 2:11 PM EDT	Severe Thunderstorm Warning	RAH	Granville, Vance, Warren	49 min
May 27, 2:19 PM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Hoke	56 min
May 27, 2:25 PM EDT	Flash Flood Watch	RAH	Alamance, Anson, Chatham, Cumberland, Davidson, Durham and 16 more	14 hr
May 27, 2:28 PM EDT	Areal Flood Advisory	RAH	Chatham, Durham, Harnett, Wake	3 hr
May 27, 2:45 PM EDT	Flash Flood Warning	RAH	Harnett, Wake	2 hr
May 27, 2:55 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Franklin, Granville, Johnston, Wake	44 min
May 27, 3:11 PM EDT	Special Weather Statement	RAH	Granville, Vance	64 min
May 27, 4:21 PM EDT	Flash Flood Warning	RAH	Durham, Orange	97 min
May 27, 5:02 PM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth	43 min
May 27, 5:56 PM EDT	Areal Flood Advisory	RAH	Forsyth	94 min
May 27, 6:22 PM EDT	Special Weather Statement	RAH	Hoke, Moore, Richmond, Scotland	53 min
May 27, 6:25 PM EDT	Special Weather Statement	RAH	Hoke, Moore, Richmond, Scotland	50 min
May 27, 7:11 PM EDT	Special Weather Statement	RAH	Anson	34 min
May 27, 7:25 PM EDT	Areal Flood Advisory	RAH	Anson	95 min
May 27, 7:46 PM EDT	Flash Flood Warning	RAH	Anson	3 hr

Nearby

Flash Flood Warnings in North Carolina, 2011 Every flash flood warning in 2011

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.