Alert archive / North Carolina / River Flood Warnings in 2018
River Flood Warning 64, NWS Raleigh, NC
NWS Raleigh, NC issued this river flood warning at Dec 21, 2018, 2:40 AM EST for Alamance County, North Carolina. It took effect at Dec 21, 2018, 3:05 AM EST. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 21, 2018, 2:40 AM EST (07:40 UTC)
- In effect from
- Dec 21, 2018, 3:05 AM EST
- Expired
- Dec 21, 2018, 12:44 PM EST
- In force
- 10 hr
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
- Flood severity
- Minor
County Alamance County, NC
The radar
The Raleigh/Durham radar (KRAX), 95 km from the middle of the area, began a volume at 07:43 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 river
Written for the forecast point Haw River at Haw River (HAWN7). The gauge peaked at 18.78 ft at Dec 21, 2018, 6:00 AM EST.
- Action stage
- 16 ft
- Minor stage
- 18 ft
- Moderate stage
- 23 ft
- Major stage
- 27 ft
This gauge today: stage, forecast and historic crests
Stage from the USGS instantaneous record for site 02096500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.
The text
As transmitted.
992
WGUS42 KRAH 210740
FLWRAH
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Raleigh, NC
240 AM EST Fri Dec 21 2018
...The National Weather Service in Raleigh has issued a
Flood Warning for the following rivers in North Carolina...
Haw River At Haw River affecting Alamance County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Safety message. If you encounter deep water while driving, do not
attempt to drive through. Turn around, dont drown.
&&
NCC001-211939-
/O.NEW.KRAH.FL.W.0064.181221T0805Z-181222T0300Z/
/HAWN7.1.ER.181221T0805Z.181221T1200Z.181221T1500Z.NO/
240 AM EST Fri Dec 21 2018
The National Weather Service in Raleigh has issued a
* Flood Warning for
The Haw River At Haw River.
* until this evening, or until the warning is cancelled.
* At 2:16 AM Friday the stage was 17.8 feet.
* Flood stage is 18.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage by early
this morning and continue to rise to near 18.9 feet by this
morning.The river will fall below flood stage by late this morning.
* Impact...At 18.0 feet, Overflow begins on both banks at the water
treatment plant.
&&
The following are the latest observations and 7 AM forecast stages
for the next several days.
FLD OBSERVED FORECAST 7 AM
LOCATION STG STG DAY TIME Sat Sun Mon Tue Wed
Haw River
Haw River 18 17.8 Fri 02 AM 15.0 11.6 9.2 7.5
&&
LAT...LON 3624 7953 3613 7934 3590 7918 3585 7930
3604 7944 3613 7954
$$2 follow-up statements
318
WGUS82 KRAH 211429
FLSRAH
Flood Statement
National Weather Service Raleigh, NC
929 AM EST Fri Dec 21 2018
...The Flood Warning continues for the following rivers in North
Carolina...
Haw River At Haw River affecting Alamance County
Haw River Near Bynum affecting Chatham County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Safety message. If you encounter deep water while driving, do not
attempt to drive through. Turn around, dont drown.
&&
NCC001-220229-
/O.EXT.KRAH.FL.W.0064.000000T0000Z-181222T0916Z/
/HAWN7.1.ER.181221T0739Z.181221T1131Z.181221T2116Z.NO/
929 AM EST Fri Dec 21 2018
The Flood Warning continues for
the Haw River At Haw River.
* At 9:16 AM Friday the stage was 18.4 feet.
* Flood stage is 18.0 feet.
* Minor flooding is occurring and Minor flooding is forecast.
* Impact...At 20.0 feet, There is significant overflow on the right
bank opposite the water treatment plant.
* Impact...At 18.0 feet, Overflow begins on both banks at the water
treatment plant.
&&
The following are the latest observations and 7 AM forecast stages
for the next several days.
FLD OBSERVED FORECAST 7 AM
LOCATION STG STG DAY TIME Sat Sun Mon Tue Wed
Haw River
Haw River 18 18.4 Fri 09 AM 15.6 11.7 9.2 7.5 6.2
&&
LAT...LON 3624 7953 3613 7934 3590 7918 3585 7930
3604 7944 3613 7954
$$
NCC037-220229-
/O.EXT.KRAH.FL.W.0063.000000T0000Z-181222T2308Z/
/BYNN7.1.ER.181221T0552Z.181221T1800Z.181222T1108Z.NO/
929 AM EST Fri Dec 21 2018
The Flood Warning continues for
the Haw River Near Bynum.
* At 9:01 AM Friday the stage was 12.4 feet.
* Flood stage is 11.0 feet.
* Minor flooding is occurring and Minor flooding is forecast.
* Forecast...The river will continue rising to near 12.5 feet by this
afternoon. The river will fall below flood stage tomorrow morning.
* Impact...At 11.0 feet, The river widens up to 400 feet across. It
floods pasturelands on the right bank and woodlands on the left.
&&
The following are the latest observations and 7 AM forecast stages
for the next several days.
FLD OBSERVED FORECAST 7 AM
LOCATION STG STG DAY TIME Sat Sun Mon Tue Wed
Haw River
Bynum 11 12.4 Fri 09 AM 10.9 9.0 7.7 6.9 6.4
&&
LAT...LON 3590 7918 3582 7911 3576 7905 3569 7916
3585 7930
$$759
WGUS82 KRAH 211744
FLSRAH
Flood Statement
National Weather Service Raleigh, NC
1244 PM EST Fri Dec 21 2018
...The Flood Warning is cancelled for the following rivers in North
Carolina...
Haw River At Haw River affecting Alamance County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Safety message. If you encounter deep water while driving, do not
attempt to drive through. Turn around, dont drown.
&&
NCC001-211814-
/O.CAN.KRAH.FL.W.0064.000000T0000Z-181222T0916Z/
/HAWN7.1.ER.181221T0739Z.181221T1131Z.181221T1608Z.NO/
1244 PM EST Fri Dec 21 2018
The Flood Warning is cancelled for
the Haw River At Haw River.
* At 12:31 PM Friday the stage was 17.7 feet.
* Flood stage is 18.0 feet.
* The river fell below flood stage at 11:08 AM Friday.
* Forecast...The river will continue to fall to 14.8 feet by tomorrow
morning.
* Impact...At 18.0 feet, Overflow begins on both banks at the water
treatment plant.
&&
The following are the latest observations and 7 AM forecast stages
for the next several days.
FLD OBSERVED FORECAST 7 AM
LOCATION STG STG DAY TIME Sat Sun Mon Tue Wed
Haw River
Haw River 18 17.7 Fri 01 PM 14.8 11.7 9.2 7.5 6.2
&&
LAT...LON 3624 7953 3613 7934 3590 7918 3585 7930
3604 7944 3613 7954
$$What forecasters said that day
The local office's own words before this river flood warning 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 river flood warning went out at Dec 21, 12:55 AM EST, 1 hour 45 minutes earlier.
Area forecast discussion, Dec 21, 12:55 AM EST, 1 hour 45 minutes before
Area Forecast Discussion National Weather Service Raleigh NC 1255 AM EST Fri Dec 21 2018 .SYNOPSIS... A storm system will continue to track northeast through central North Carolina through Friday bringing unsettled conditions to our area. This storm system will move off the East Coast Saturday, allowing high pressure to build over the Southeast U.S. Saturday night through Monday. && .NEAR TERM /THROUGH TONIGHT/... As of 1020 PM Thursday... Not much change to previous forecast, still adjusting temperatures based on the northwestward progression of the warm front and the convective showers lifting through portions of central NC. The aforementioned warm front is slowly continuing to drift northwestward, bisecting the Triad as of 01Z and through Winston- Salem as of 03Z. Temperatures rise significantly in the wake of the fropa, with increases of 5-10 degrees or more in the span of a few hours. Along and east of US-1 temperatures are generally in the mid 60s, with low 60s between US-1 and I-85 and low to mid 50s at points northwest of there. The overall coverage of precipitation continues to decrease, however the intensity of some of the showers has increased. While the best chance for any severe weather remains along the coast, there is still a slight chance for some isolated strong winds over central NC. The chance best chance will be over the next couple of hours, after that the chances wane. There are several surface lows over Southeast and Mid-Atlantic regions, however the closest was over WV/VA as of 02Z. As the low lifts northeast overnight, expect some decrease in both coverage and intensity of rain across the area. Another low, currently over AL/GA, will slowly lift northeastward toward the area overnight. The primary surface low, cold front and upper level low will remain west of the mountains tonight, but will bee an issue Friday. Temperatures should be topping out in the next couple of hours, slowly decreasing thereafter. With temperatures currently in the low to mid 60s across much of the area, only expect them to bottom out a category or two lower, mid 50s to low 60s. && .SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/... As of 300 PM Thursday... The upper trough axis will maintain its slight negative tilt as it moves over the Eastern US, its axis shifting overhead and just to our ENE Fri night. DPVA/height falls aloft along with still-potent upper divergence and elevated PW (150% of normal) will necessitate good chance to likely pops for showers, although the loss of Atlantic inflow as deep layer winds veer to SSW and the reduced PW and retreat of the highest dewpoints to our NNE should trim coverage and intensity Fri as compared to today's rainfall. Have decreased POPs/QPF slightly, slowly shifting SW to NE in tandem with passage of the 850-500 mb trough axis. Winds will remain southerly to begin the day, especially across the central Piedmont, where gusts higher than 30kts possible as some mixing is allowed on Friday. Further veering of low and mid level winds to W and NW in the wake of the low will bring in drier air late Fri night, and will end pops shortly after midnight with a trend toward clearing skies W to E. Highs 56-67 (NW to SE), followed by lows in the upper 30s to lower 40s with the onset of cold air advection overnight. && .LONG TERM /SATURDAY THROUGH THURSDAY/... As of 300 PM Thursday... Saturday morning an upper level trough axis will be heading east with surface high pressure located over the Gulf of Mexico. Highs from around 50 degrees with lows in the lower 30s looks likely with no precipitation in the forecast. During the day Sunday a shortwave will head east out of the central United States and move across central North Carolina. The front looks to cross the zones Sunday evening and appears to be weak. Saturated theta-e compaction is very weak and a pre-frontal trough exists which will limit surface convergence. Monday into Tuesday surface high pressure will move overhead with more dry weather and near normal temperatures. Towards the end of the extended models diverge with the general idea being a closed low over the southwestern United States and heights slowly rising over North Carolina. As this occurs another cold front will move across the area with the next system rapidly approaching the area Thursday. && .AVIATION /06Z FRIDAY THROUGH TUESDAY/... As of 1255 AM Friday... Aviation conditions will remain mostly MVFR through the rest of the nighttime hours, but with brief periods of both IFR cigs (as scattered lower clouds become broken at times) and VFR cigs (as holes develop in the MVFR cloud deck, revealing higher clouds above). The greatest chance of IFR cigs will be at INT, close to the westward-drifting warm frontal zone. Vsbys across the area will be mostly VFR but will periodically become MVFR, primarily within scattered showers that persist over the region. Winds will remain from the SSE and S with infrequent gusts to around 15 kts. After daybreak, cigs will begin to lift slowly and break up, occurring first at RWI/FAY during the mid to late morning, when we may even see a period of VFR conditions. MVFR cigs will linger longer at RDU/INT/GSO, although enough holes may develop in the MVFR cloud deck to flip to VFR at these locations after 17z. Showers will gradually dwindle from S to N during the morning, as low pressure tracks northward over the S Appalachians while slightly drier air moves into central NC from the S. But the risk of showers will remain through the day, especially at INT/GSO, as a strong upper level low crosses the region. MVFR conditions are expected with these showers. As the surface low continues moving northward over the Central Appalachians and drags a cold front through central NC, we'll see a trend to high-confidence VFR conditions late afternoon, persisting through tonight as blustery winds from the S shift around to westerly, bringing in drier air. Looking beyond 06z Sat, VFR conditions should dominate late tonight through Christmas Day as high pressure extend over the region, although a brief period of MVFR cigs is possible Sun night with a quickly passing upper level disturbance. -GIH && .RAH WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...JM NEAR TERM...KC SHORT TERM...JM/ Hartfield LONG TERM...Haines AVIATION...Hartfield
Hazardous weather outlook, Dec 20, 11:29 PM EST, 3 hours 11 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Raleigh NC 1129 PM EST Thu Dec 20 2018 NCZ007>011-021>028-038>043-073>078-083>086-088-089-211030- 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- 1129 PM EST Thu Dec 20 2018 This Hazardous Weather Outlook is for central North Carolina. .DAY ONE...Overnight. Periods of moderate to briefly heavy rainfall will occur overnight. This additional rainfall on an already saturated ground will quickly run off, leading to rain swollen creeks and streams as well as minor street flooding. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 10:37 PM EST | River Flood Warning | RAH | Anson, Stanly | 13 hr |
| Dec 21, 12:10 AM EST | River Flood Warning | RAH | Chatham | 30 hr |
| Dec 21, 9:35 AM EST | Wind Advisory | RAH | Cumberland, Edgecombe, Franklin, Halifax, Harnett, Hoke and 7 more | 10 hr |
| Dec 21, 11:01 AM EST | River Flood Warning | RAH | Davidson, Davie | 27 hr |
| Dec 21, 2:59 PM EST | Special Weather Statement | RAH | Chatham | 61 min |
| Dec 21, 3:10 PM EST | Special Weather Statement | RAH | Lee | 65 min |
| Dec 21, 3:18 PM EST | Special Weather Statement | RAH | Person | 57 min |
| Dec 21, 3:25 PM EST | Special Weather Statement | RAH | Alamance | 50 min |
| Dec 21, 3:44 PM EST | River Flood Warning | RAH | Halifax, Northampton | 26 days |
| Dec 21, 4:08 PM EST | Special Weather Statement | RAH | Johnston, Nash | 52 min |
| Dec 21, 4:18 PM EST | Special Weather Statement | RAH | Alamance | 57 min |
| Dec 21, 5:06 PM EST | Special Weather Statement | RAH | Edgecombe, Halifax | 54 min |
Nearby
River Flood Warnings in North Carolina, 2018Every river flood warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.