Alert archive / North Carolina / Flash Flood Warnings in 2011
Flash Flood Warning 23, NWS Raleigh, NC
NWS Raleigh, NC issued this flash flood warning at Jul 8, 2011, 9:37 PM EDT for Guilford County, Randolph County, North Carolina. It was in force for 3 hr. 1 report 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
- Jul 8, 2011, 9:37 PM EDT (01:37 UTC)
- Expired
- Jul 9, 2011, 12:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
- Flood severity
- None
Counties Guilford County, NC, Randolph County, NC
The radar
The Roanoke radar (KFCX), 115 km from the middle of the area, began a volume at 01:38 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 |
|---|---|---|---|
| Jul 8, 10:25 PM EDT | FLASH FLOOD | 3 E Greensboro, NC | BESSEMER AVENUE CLOSED AT HIGH 29 DUE TO HIGH WATER. |
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, 1.6 hours before the alert went out and 14 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
- 884 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1019 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
697 WGUS52 KRAH 090137 FFWRAH NCC081-151-090430- /O.NEW.KRAH.FF.W.0023.110709T0137Z-110709T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE RALEIGH NC 937 PM EDT FRI JUL 8 2011 THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A * FLASH FLOOD WARNING FOR... GUILFORD COUNTY IN CENTRAL NORTH CAROLINA RANDOLPH COUNTY IN CENTRAL NORTH CAROLINA * UNTIL 1230 AM EDT * AT 931 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN PRODUCING FLOODING OVER NORTHERN RANDOLPH AND GUILFORD COUNTIES. RAINFALL RATES IN EXCESS OF 3 INCHES PER HOUR WILL PRODUCE FLASH FLOODING. * LOCATIONS THREATENED WITH FLOODING INCLUDE MCLEANSVILLE...HIGH POINT... ARCHDALE... 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. 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. 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 3586 7954 3578 8006 3626 8003 $$ 77
1 follow-up statement
506 WGUS72 KRAH 090234 FFSRAH FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 1034 PM EDT FRI JUL 8 2011 NCC081-151-090430- /O.CON.KRAH.FF.W.0023.000000T0000Z-110709T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GUILFORD NC-RANDOLPH NC- 1034 PM EDT FRI JUL 8 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT FOR NORTHERN RANDOLPH AND GUILFORD COUNTIES... AT 1030 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS PRODUCING MODERATE TO HEAVY RAINFALL MOVING OVER THE SAME AREA PRODUCING FLOODING IN NORTHERN RANDOLPH AND GUILFORD COUNTIES. DOPPLER RADAR ESTIMATED THAT AS MUCH AS 1 TO 2 INCHES OF RAIN HAS FALLEN ACROSS PORTIONS OF THE WARNED AREA. AN ADDITIONAL 1 TO 2 INCHES OF RAINFALL ARE STILL POSSIBLE RESULTING IN ADDITIONAL FLOODING. LOCATIONS THREATENED BY FLOODING INCLUDE BUT ARE NOT LIMITED TO HIGH POINT... GREENSBORO... ARCHDALE... AND PLEASANT GARDEN. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING OF CREEKS AND STREAMS...ROADS...LOW LYING AND POOR DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. MANY ROADS AND INTERSECTIONS IN THE AREA WILL QUICKLY FLOOD. WHEN ENCOUNTERING FLOODED ROADS TURN AROUND...DONT DROWN. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. PLEASE REPORT FLOODING TO THE NATIONAL WEATHER SERVICE BY CALLING... 1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW ENFORCEMENT AGENCY. && LAT...LON 3625 7954 3586 7954 3578 8006 3626 8003 $$ 77
The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 8:28 PM EDT | Areal Flood Advisory | RAH | Durham, Orange | 52 min |
| Jul 8, 8:31 PM EDT | Special Weather Statement | RAH | Durham, Orange | 59 min |
| Jul 8, 8:40 PM EDT | Special Weather Statement | RAH | Davidson, Forsyth, Guilford | 80 min |
| Jul 8, 9:05 PM EDT | Areal Flood Advisory | RAH | Davidson, Forsyth, Guilford, Randolph | 3 hr |
| Jul 8, 9:25 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Forsyth | 65 min |
| Jul 8, 9:28 PM EDT | Severe Thunderstorm Warning | RAH | Guilford, Randolph | 60 min |
| Jul 8, 9:33 PM EDT | Flash Flood Warning | RAH | Davidson, Forsyth | 3 hr |
| Jul 9, 12:19 AM EDT | Flash Flood Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 3 hr |
| Jul 9, 5:16 PM EDT | Special Weather Statement | RAH | Scotland | 59 min |
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.