Alert archive / North Carolina / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Raleigh, NC
NWS Raleigh, NC issued this flash flood warning at Aug 14, 2021, 3:25 PM EDT for Chatham County, Durham County, Wake 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
- Aug 14, 2021, 3:25 PM EDT (19:25 UTC)
- Expired
- Aug 14, 2021, 6:07 PM EDT
- In force
- 3 hr
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Chatham County, NC, Durham County, NC, Wake County, NC
The radar
The Raleigh/Durham radar (KRAX), 35 km from the middle of the area, began a volume at 19:25 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 12:00Z, 7.4 hours before the alert went out and 100 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
- 1624 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 954 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
926
WGUS52 KRAH 141925
FFWRAH
NCC037-063-183-142230-
/O.NEW.KRAH.FF.W.0018.210814T1925Z-210814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Raleigh NC
325 PM EDT Sat Aug 14 2021
The National Weather Service in Raleigh has issued a
* Flash Flood Warning for...
Southeastern Chatham County in central North Carolina...
Southeastern Durham County in central North Carolina...
Western Wake County in central North Carolina...
* Until 630 PM EDT.
* At 325 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 2 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Raleigh, Durham, Cary, Wake Forest, RDU International, Apex, Holly
Springs, Morrisville, Research Triangle, William B Umstead State
Park, Carpenter, Bethesda, New Hill, Jordan Lake, Falls Lake and
Falls Lake State Rec Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3563 7908 3577 7904 3587 7891 3604 7881
3607 7876 3607 7868 3598 7844 3584 7867
3568 7879 3565 7879 3556 7886 3558 7891
3554 7902 3555 7903
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
103 follow-up statements
699
WGUS72 KRAH 142005
FFSRAH
Flash Flood Statement
National Weather Service Raleigh NC
405 PM EDT Sat Aug 14 2021
NCC037-142015-
/O.CAN.KRAH.FF.W.0018.000000T0000Z-210814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chatham NC-
405 PM EDT Sat Aug 14 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN CHATHAM
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3587 7891 3604 7881 3607 7876 3607 7868
3599 7848 3584 7867 3568 7879 3565 7879
3561 7882 3561 7900 3584 7891
$$
NCC063-183-142230-
/O.CON.KRAH.FF.W.0018.000000T0000Z-210814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Durham NC-Wake NC-
405 PM EDT Sat Aug 14 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT THIS
EVENING FOR SOUTHEASTERN DURHAM AND WESTERN WAKE COUNTIES...
At 405 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to 2 inches of rain have fallen.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Raleigh, Durham, Cary, Wake Forest, RDU International, Apex, Holly
Springs, Morrisville, William B Umstead State Park, Research
Triangle, Carpenter, Bethesda, Falls Lake, New Hill, Jordan Lake,
Purnell and Shearon Harris Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3587 7891 3604 7881 3607 7876 3607 7868
3599 7848 3584 7867 3568 7879 3565 7879
3561 7882 3561 7900 3584 7891
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
10766
WGUS72 KRAH 142102
FFSRAH
Flash Flood Statement
National Weather Service Raleigh NC
502 PM EDT Sat Aug 14 2021
NCC063-142112-
/O.CAN.KRAH.FF.W.0018.000000T0000Z-210814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Durham NC-
502 PM EDT Sat Aug 14 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN DURHAM COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 3576 7873 3568 7879 3565 7879 3561 7882
3561 7899 3561 7900 3563 7899 3564 7899
3566 7898 3568 7897 3569 7897 3572 7895
3573 7895 3577 7893
$$
NCC183-142230-
/O.CON.KRAH.FF.W.0018.000000T0000Z-210814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wake NC-
502 PM EDT Sat Aug 14 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT THIS
EVENING FOR SOUTHWESTERN WAKE COUNTY...
At 502 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to 2 inches of rain have fallen.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Raleigh, Cary, Apex, Holly Springs, New Hill, Shearon Harris
Reservoir and Jordan Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3576 7873 3568 7879 3565 7879 3561 7882
3561 7899 3561 7900 3563 7899 3564 7899
3566 7898 3568 7897 3569 7897 3572 7895
3573 7895 3577 7893
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
10756
WGUS72 KRAH 142207
FFSRAH
Flash Flood Statement
National Weather Service Raleigh NC
607 PM EDT Sat Aug 14 2021
NCC183-142217-
/O.CAN.KRAH.FF.W.0018.000000T0000Z-210814T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wake NC-
607 PM EDT Sat Aug 14 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN WAKE COUNTY...
The heavy rain has ended and flooding is no longer expected to pose
a threat. However, there may be lingering ponding of water on area
roadways, so please continue to heed remaining road closures.
LAT...LON 3576 7873 3568 7879 3565 7879 3561 7882
3561 7899 3561 7900 3563 7899 3564 7899
3566 7898 3568 7897 3569 7897 3572 7895
3573 7895 3577 7893
$$
10The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:56 PM EDT | Special Weather Statement | RAH | Vance | 64 min |
| Aug 13, 9:36 PM EDT | Special Weather Statement | RAH | Stanly | 24 min |
| Aug 13, 10:11 PM EDT | Special Weather Statement | RAH | Stanly | 34 min |
| Aug 13, 10:45 PM EDT | Special Weather Statement | RAH | Montgomery | 45 min |
| Aug 13, 11:26 PM EDT | Special Weather Statement | RAH | Montgomery, Moore | 64 min |
| Aug 14, 12:03 AM EDT | Special Weather Statement | RAH | Granville | 42 min |
| Aug 14, 12:37 AM EDT | Severe Thunderstorm Warning | RAH | Davidson, Montgomery, Stanly | 68 min |
| Aug 14, 4:01 AM EDT | Heat Advisory | RAH | Chatham, Cumberland, Durham, Edgecombe, Franklin, Granville and 14 more | 14 hr |
| Aug 14, 1:46 PM EDT | Special Weather Statement | RAH | Moore | 44 min |
| Aug 14, 1:47 PM EDT | Special Weather Statement | RAH | Wake | 43 min |
| Aug 14, 2:09 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Stanly | 51 min |
| Aug 14, 2:15 PM EDT | Severe Thunderstorm Warning | RAH | Franklin, Johnston, Nash, Wake | 45 min |
| Aug 14, 2:33 PM EDT | Flash Flood Warning | RAH | Franklin, Wake | 2 hr |
| Aug 14, 2:50 PM EDT | Severe Thunderstorm Warning | RAH | Wake | 40 min |
| Aug 14, 2:55 PM EDT | Special Weather Statement | RAH | Stanly | 65 min |
| Aug 14, 3:01 PM EDT | Severe Thunderstorm Warning | RAH | Durham, Granville, Wake | 44 min |
| Aug 14, 3:27 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Harnett, Wake | 37 min |
| Aug 14, 3:39 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Durham, Wake | 51 min |
| Aug 14, 3:45 PM EDT | Special Weather Statement | RAH | Durham | 60 min |
| Aug 14, 3:53 PM EDT | Severe Thunderstorm Warning | RAH | Durham, Granville, Wake | 29 min |
| Aug 14, 4:08 PM EDT | Areal Flood Advisory | RAH | Anson, Richmond | 70 min |
| Aug 14, 4:08 PM EDT | Special Weather Statement | RAH | Anson, Richmond | 52 min |
| Aug 14, 4:38 PM EDT | Special Weather Statement | RAH | Forsyth | 67 min |
| Aug 14, 4:44 PM EDT | Special Weather Statement | RAH | Wake | 61 min |
| Aug 14, 4:50 PM EDT | Severe Thunderstorm Warning | RAH | Forsyth | 40 min |
| Aug 14, 5:19 PM EDT | Severe Thunderstorm Warning | RAH | Alamance | 19 min |
| Aug 14, 5:24 PM EDT | Areal Flood Advisory | RAH | Forsyth | 2 hr |
| Aug 14, 6:25 PM EDT | Special Weather Statement | RAH | Guilford | 35 min |
| Aug 14, 6:32 PM EDT | Areal Flood Advisory | RAH | Guilford | 118 min |
| Aug 14, 6:48 PM EDT | Special Weather Statement | RAH | Guilford | 57 min |
| Aug 14, 7:23 PM EDT | Flash Flood Warning | RAH | Guilford | 2 hr |
Nearby
Flash Flood Warnings in North Carolina, 2021Every flash flood warning in 2021
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.