Alert archive / North Carolina / Flash Flood Warnings in 2011
Flash Flood Warning 48, NWS Raleigh, NC
NWS Raleigh, NC issued this flash flood warning at Sep 21, 2011, 9:03 PM EDT for Wake County, North Carolina. It was in force for 3 hr. 7 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 21, 2011, 9:03 PM EDT (01:03 UTC)
- Expired
- Sep 21, 2011, 11:46 PM EDT
- In force
- 3 hr
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
- Flood severity
- None
County Wake County, NC
The radar
The Raleigh/Durham radar (KRAX), 20 km from the middle of the area, began a volume at 01:05 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 |
|---|---|---|---|
| Sep 21, 9:10 PM EDT | HEAVY RAIN 2.51 | 3 Wsw Raleigh, NC | 2.51 INCHES OF RAIN MEASURED IN 1.5 HOURS AT RIDGE ROAD AND WADE AVENUE |
| Sep 21, 9:50 PM EDT | FLASH FLOOD | 4 Sw Raleigh, NC | AVENT FERRY BLOCKED AT TRAILWOOD DUE TO FLOODING |
| Sep 21, 9:50 PM EDT | FLASH FLOOD | 4 Wsw Raleigh, NC | BLUE RIDGE ROAD AT WESTERN BLVD WAS BLOCKED DUE TO FLOODING |
| Sep 21, 9:50 PM EDT | FLASH FLOOD | 5 E Cary, NC | HILLSBORO STREET WAS BLOCKED OFF AT THE RAILROAD CROSSING NEAR THE CHAPEL HILL ROAD SPLIT |
| Sep 21, 9:54 PM EDT | HEAVY RAIN 2.28 | 2 Sw Holly Springs, NC | 2.28 INCHES OF RAIN OBSERVED IN 1.5 HOURS |
| Sep 21, 10:15 PM EDT | FLASH FLOOD | 3 Nne Raleigh, NC | THREE FEET OF WATER ON OLD WAKE FOREST ROAD WITH VEHICHLE STUCK |
| Sep 21, 10:20 PM EDT | FLASH FLOOD | 3 Nw New Hope, NC | VEHICLE STUCK IN FLOODING AT MILBROOK ROAD AND HOYLE DRIVE |
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 00:00Z, 1.1 hours before the alert went out and 125 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.
- Mixed-layer CAPE
- 515 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 576 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
417
WGUS52 KRAH 220103
FFWRAH
NCC183-220400-
/O.NEW.KRAH.FF.W.0048.110922T0103Z-110922T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
903 PM EDT WED SEP 21 2011
THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WAKE COUNTY IN CENTRAL NORTH CAROLINA
* UNTIL MIDNIGHT EDT
* AT 903 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS THAT WERE CONTINUOUSLY REDEVELOPING AND PRODUCING
VERY HEAVY RAINFALL OVER WAKE COUNTY... FROM HOLLY SPRINGS TO
RALEIGH AND WAKE FOREST. NATIONAL WEATHER SERVICE RADAR INDICATED
RAINFALL RATES IN EXCESS OF 2 INCHES PER HOUR WITH THESE STORMS.
THE THUNDERSTORMS WITH THE HEAVIEST RAIN AT 900 PM WERE OVER
RALEIGH AND BETWEEN HOLLY SPRINGS AND APEX... MOVING NORTHEAST AT
15 MPH.
* LOCATIONS THREATENED WITH FLOODING INCLUDE WAKE FOREST...RALEIGH...
GARNER...FUQUAY-VARINA AND CARY.
TRAINING OF THE THUNDERSTORMS WITH RAINFALL RATES IN EXCESS OF 2
INCHES PER HOUR WILL RESULT IN FLASH FLOODING IN RALEIGH AND
SURROUNDING AREAS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TURN AROUND...DONT DROWN.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&&
LAT...LON 3595 7840 3594 7839 3594 7838 3582 7826
3555 7872 3561 7895 3579 7881 3602 7855
$$
BADGETT3 follow-up statements
646
WGUS72 KRAH 220138
FFSRAH
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
938 PM EDT WED SEP 21 2011
NCC183-220400-
/O.CON.KRAH.FF.W.0048.000000T0000Z-110922T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAKE NC-
938 PM EDT WED SEP 21 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
WAKE COUNTY...
AT 935 PM EDT...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH VERY
HEAVY RAIN OVER RALEIGH AND MUCH OF CENTRAL AND EASTERN WAKE COUNTY.
DOPPLER RADAR ESTIMATED THAT BETWEEN 2 AND 3 INCHES OF RAIN HAD
FALLEN OVER AREAS FROM HOLLY SPRINGS TO RALEIGH SINCE 830 PM.
WEATHER SPOTTERS REPORTED 1 TO 2 FEET OF WATER ON SEVERAL STREETS
AROUND NORTH CAROLINA STATE UNIVERSITY AND FLOODING WAS OCCURRING IN
DOWNTOWN RALEIGH.
LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO
RALEIGH... WAKE FOREST... KNIGHTDALE... WENDELL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TURN AROUND...DONT DROWN.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY CALLING...
1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW ENFORCEMENT
AGENCY.
&&
LAT...LON 3595 7840 3594 7839 3594 7838 3582 7826
3555 7872 3561 7895 3579 7881 3602 7855
$$
BADGETT741
WGUS72 KRAH 220303
FFSRAH
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
1103 PM EDT WED SEP 21 2011
NCC183-220400-
/O.CON.KRAH.FF.W.0048.000000T0000Z-110922T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAKE NC-
1103 PM EDT WED SEP 21 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR
CENTRAL AND NORTHEASTERN WAKE COUNTY...
AT 1059 PM EDT...LOCAL LAW ENFORCEMENT REPORTED SEVERAL ROAD
CLOSURES FROM WEST THROUGH DOWNTOWN AND NORTHEAST RALEIGH. THIS
INCLUDED PORTIONS OF OLD WAKE FOREST ROAD... HODGES ROAD... ATLANTIC
AVENUE... AVENT FERRY... LAKE BOONE TRAIL... AND WADE AVENUE.
SEVERAL CARS STALLED IN THE FLOODING ON OLD WAKE FOREST ROAD AND
HODGES AND THE CARS WERE ABANDONED.
SINCE THE THE HEAVIEST RAIN HAS SHIFTED INTO FRANKLIN COUNTY...
ADDITIONAL HEAVY RAIN IN THE NEXT FEW HOURS IS NOT ANTICIPATED. THE
FLASH FLOODING IS EXPECTED TO SLOWLY RETREAT IN THE NEXT HOUR. THE
WARNING SHOULD BE ALLOWED TO EXPIRE BARRING ADDITIONAL HEAVY RAIN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3595 7841 3594 7839 3594 7838 3582 7826
3573 7862 3577 7882 3602 7855
$$
BADGETT628
WGUS72 KRAH 220346
FFSRAH
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
1146 PM EDT WED SEP 21 2011
NCC183-220350-
/O.CAN.KRAH.FF.W.0048.000000T0000Z-110922T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAKE NC-
1146 PM EDT WED SEP 21 2011
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL AND
NORTHEASTERN WAKE COUNTY...
NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE SHOWERS AND
THUNDERSTORMS WITH VERY HEAVY RAIN HAD SHIFTED WELL TO THE NORTHEAST
OF THE REGION. ONLY LIGHT AND SCATTERED SHOWERS LINGERED OVER THE
REGION.
LOCAL LAW ENFORCEMENT INDICATED THAT THE PREVIOUS ROAD CLOSURES IN
RALEIGH WERE NOW OPEN. THE FLOODING WAS RETREATING RAPIDLY EVEN
ALONG CRABTREE CREEK AT OLD WAKE FOREST ROAD AND AT ATLANTIC
AVENUE... JUST NORTH OF THE INTERSTATE 440 BELTLINE IN RALEIGH.
SINCE HEAVY RAIN IS NOT EXPECTED TO REDEVELOP OVER THE AREA IN THE
NEXT FEW HOURS... THE FLASH FLOODING WARNING WILL BE CANCELED.
LAT...LON 3595 7841 3594 7839 3594 7838 3582 7826
3573 7862 3577 7882 3602 7855
$$
BADGETTThe office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 8:43 PM EDT | Areal Flood Advisory | RAH | Wake | 3 hr |
| Sep 21, 9:50 PM EDT | Areal Flood Advisory | RAH | Chatham, Lee, Moore | 94 min |
| Sep 21, 10:37 PM EDT | Areal Flood Advisory | RAH | Franklin, Nash | 104 min |
| Sep 22, 12:13 AM EDT | Special Weather Statement | RAH | Halifax | 47 min |
| Sep 22, 3:31 PM EDT | Flash Flood Watch | RAH | Alamance, Anson, Chatham, Davidson, Durham, Forsyth and 14 more | 24 hr |
Nearby
Flash Flood Warnings in North Carolina, 2011Every 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.