Alert archive / North Carolina / Flash Flood Watches in 2020
Flash Flood Watch 5, NWS Raleigh, NC
NWS Raleigh, NC issued this flash flood watch at Aug 15, 2020, 3:56 AM EDT for 16 counties in North Carolina. It took effect at Aug 15, 2020, 5:00 AM EDT. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- Aug 15, 2020, 3:56 AM EDT (07:56 UTC)
- In effect from
- Aug 15, 2020, 5:00 AM EDT
- Expired
- Aug 15, 2020, 9:53 PM EDT
- In force
- 17 hr
- Issued by
- NWS Raleigh, NC
- Flood severity
- None
Counties Alamance County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Vance County, NC, Wake County, NC, Warren County, NC
The radar
The Raleigh/Durham radar (KRAX), 62 km from the middle of the area, began a volume at 08:00 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 00:00Z, 7.9 hours before the alert went out and 84 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
- 754 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 787 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Raleigh, NC wrote its last area forecast discussion before this flash flood watch went out at Aug 15, 3:48 AM EDT, 8 minutes earlier.
Area forecast discussion, Aug 15, 3:48 AM EDT, 8 minutes before
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</html>Hazardous weather outlook, Aug 14, 6:33 AM EDT, 21 hours 23 minutes before
Hazardous Weather Outlook National Weather Service Raleigh NC 633 AM EDT Fri Aug 14 2020 NCZ007>011-021>028-038>043-073>078-083>086-088-089-151200- Person-Granville-Vance-Warren-Halifax-Forsyth-Guilford-Alamance- Orange-Durham-Franklin-Nash-Edgecombe-Davidson-Randolph-Chatham-Wake- Johnston-Wilson-Stanly-Montgomery-Moore-Lee-Harnett-Wayne-Anson- Richmond-Scotland-Hoke-Cumberland-Sampson- 633 AM EDT Fri Aug 14 2020 This Hazardous Weather Outlook is for central North Carolina. .DAY ONE...Today and tonight. Slow-moving thunderstorms will produce locally heavy rain and a risk of flooding this afternoon and tonight. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Thunderstorms on Saturday will be capable of producing both localized flooding and strong wind gusts up to 45 mph. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Local storm report, Aug 14, 10:23 PM EDT, 5 hours 33 minutes before
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</html>Local storm report, Aug 14, 10:25 PM EDT, 5 hours 31 minutes before
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</html>Local storm report, Aug 14, 10:26 PM EDT, 5 hours 30 minutes before
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</html>Local storm report, Aug 14, 10:28 PM EDT, 5 hours 28 minutes before
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</html>The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 8:48 PM EDT | Areal Flood Advisory | RAH | Durham, Franklin, Johnston, Nash, Wake | 117 min |
| Aug 15, 1:40 PM EDT | Special Weather Statement | RAH | Forsyth | 65 min |
| Aug 15, 2:13 PM EDT | Special Weather Statement | RAH | Wilson | 47 min |
| Aug 15, 2:16 PM EDT | Areal Flood Advisory | RAH | Forsyth, Guilford | 3 hr |
| Aug 15, 2:28 PM EDT | Special Weather Statement | RAH | Warren | 62 min |
| Aug 15, 2:32 PM EDT | Special Weather Statement | RAH | Wilson | 58 min |
| Aug 15, 2:38 PM EDT | Areal Flood Advisory | RAH | Johnston, Wilson | 55 min |
| Aug 15, 3:03 PM EDT | Special Weather Statement | RAH | Davidson | 42 min |
| Aug 15, 3:29 PM EDT | Special Weather Statement | RAH | Halifax | 61 min |
| Aug 15, 3:44 PM EDT | Special Weather Statement | RAH | Franklin | 61 min |
| Aug 15, 4:14 PM EDT | Areal Flood Advisory | RAH | Franklin, Wake | 3 hr |
| Aug 15, 4:32 PM EDT | Flash Flood Warning | RAH | Durham, Franklin, Wake | 3 hr |
| Aug 15, 4:32 PM EDT | Special Weather Statement | RAH | Orange | 58 min |
| Aug 15, 5:03 PM EDT | Special Weather Statement | RAH | Wayne | 57 min |
| Aug 15, 5:27 PM EDT | Special Weather Statement | RAH | Wake | 63 min |
| Aug 15, 6:14 PM EDT | Areal Flood Advisory | RAH | Wake | 3 hr |
| Aug 15, 6:45 PM EDT | Special Weather Statement | RAH | Wake | 60 min |
| Aug 15, 7:19 PM EDT | Flash Flood Warning | RAH | Harnett | 9 hr |
Nearby
Flash Flood Watches in North Carolina, 2020Every flash flood watch in 2020
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.