Flash Flood Warning 68, NWS Raleigh, NC

974 
WGUS52 KRAH 112117
FFWRAH
NCC001-037-063-105-135-183-120130-
/O.EXT.KRAH.FF.W.0068.000000T0000Z-181012T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Raleigh NC
517 PM EDT THU OCT 11 2018

The National Weather Service in Raleigh has extended the

* Flash Flood Warning for...
  Alamance County in central North Carolina...
  Orange County in central North Carolina...
  Lee County in central North Carolina...
  Wake County in central North Carolina...
  Chatham County in central North Carolina...
  Durham County in central North Carolina...

* Until 930 PM EDT

* At 514 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Three to 5 inches of rain have fallen across the 
  Triangle, resulting in flash flooding. Rain will likely continue 
  through the evening, resulting in additional rainfall of up to 2 
  inches. 

* Some locations that will experience flooding include...
  Raleigh, Durham, Cary, Chapel Hill, Burlington, Sanford, Graham,
  Hillsborough, Pittsboro and Siler City.

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. When 
encountering flooded roads, turn around, don't drown. Be especially 
cautious at night when it is harder to recognize the dangers of 
flooding. River banks and culverts can become unstable and unsafe. 
Stay away or be swept away. 

&&

LAT...LON 3624 7880 3609 7881 3607 7878 3608 7869
      3598 7843 3590 7831 3582 7826 3571 7847
      3552 7871 3558 7891 3531 7918 3535 7927
      3547 7936 3552 7935 3552 7956 3624 7953
      3625 7953

$$

10

117 
WGUS72 KRAH 120123
FFSRAH

Flash Flood Statement
National Weather Service Raleigh NC
923 PM EDT THU OCT 11 2018

NCC001-037-063-105-135-183-120133-
/O.EXP.KRAH.FF.W.0068.000000T0000Z-181012T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Alamance NC-Orange NC-Lee NC-Wake NC-Chatham NC-Durham NC-
923 PM EDT THU OCT 11 2018

...THE FLASH FLOOD WARNING FOR ALAMANCE...ORANGE...LEE...WAKE...
CHATHAM AND DURHAM COUNTIES WILL EXPIRE AT 930 PM EDT...

Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 3624 7880 3609 7881 3607 7878 3608 7869
      3598 7843 3590 7831 3582 7826 3571 7847
      3552 7871 3558 7891 3531 7918 3535 7927
      3547 7936 3552 7935 3552 7956 3624 7953
      3625 7953

$$

77

Area Forecast Discussion
National Weather Service Raleigh NC
1005 AM EDT Thu Oct 11 2018

.SYNOPSIS...
The circulation of Tropical Storm Michael will move quickly
northeast over central NC today, before moving off the Mid Atlantic
coast tonight. High pressure will build in from the northwest and
north late tonight through Saturday. A warm front will move
northward into the region Sunday through Sunday night.

&&

.NEAR TERM /THROUGH TONIGHT/...
As of 1005 AM Thursday...

Mostly minor tweaks to the forecast. The center of Michael is just
NW of CAE at this hour. Very heavy rain associated with Michael will
continue tracking NE over the forecast area today. Rates of two
thirds to one inch per hour have been confirmed upstream already, so
a storm total of 3-6" over the Piedmont, highest from the Triad N,
and lower amounts of 1-3" over the SE still seem reasonable. Heavy
rain is ongoing over the SW, and this threat will last through much
of the afternoon, extending into the evening over the N half. Will
maintain the flash flood watch as is.

Wind remains a significant concern. While the initial area of strong
southerly and southeast winds just E of the circulation will impact
the area first, strengthening winds from the N on the W side, within
convection immediately ahead of the incoming cold front, may be
stronger and more impactful. Many models depict winds reaching 40-60
kts just off the surface, and with the likelihood of weakened tree
root structures and soft saturated soils, plus the potential wind
lull that may precede it, could make for greater, focused wind
damage and power outages if even some of this wind can make it down
to the ground.

Tornadoes remain possible, primarily in the climatologically favored
areas along and E of the center's track. But this threat will spread
further N/NW into the Triad, particularly this afternoon into early
evening, as low level shear ramps up and potential instability
spreads into the N Piedmont. The risk is much lower over our far SW,
as the circulation center will be in this area shortly.

Highs in the mid 70s to lower 80s will be maintained. -GIH

Earlier discussion from 410 AM: The axis of heaviest and rain
strongest wind gusts associated with Michael has shifted north
slightly with the most significant impacts expected late this
morning into early this evening.

The center of Tropical Storm Michael was located northeast of Macon
Georgia early this morning with the system continuing to
accelerate northeastward. The leading band of showers/storms is
poised to move into the southern Piedmont before daybreak. While
the rain shield associated with the core of Michael will move
into the western Piedmont and Sandhills between 6am and 10am and
then into the remainder of the Piedmont, Sandhills and Coastal
Plain between 10 am and 2pm.

The track of the circulation center has shifted north and its
forward motion across central NC is faster than last night.
With this in mind, the region of strongest winds and heaviest
rain has shifted north a bit as well.

The biggest change with this package will be a notable increase
in forecast wind gusts across the northern Piedmont, primarily
owing to a northerly jet and increased mixing on the back side
of Michael's circulation. These wind gusts will be occurring to
the northwest and west of the circulation center, likely in and
near an arc of very heavy rain in a semi-circle across the
northern and northwestern half of the circulation center that
moves across the Triad between 16 and 20Z, the Triangle 18 to
22Z and the northern Coastal Plain between 20 to 00Z. Wind gusts
on the order 35 to 40 MPH look like a good bet with the
potential for a few gusts approaching 50 MPH. Elsewhere in
central NC wind gusts will generally range between 25 and 35 MPH
with a few stronger gusts. These magnitudes will be sufficient
to bring some trees down and produce some power outages.

Given the upper air pattern, the precipitation distribution
will follow a left of track pattern, favoring the heaviest
rain across the northwest and northern Piedmont. WPC guidance
indicates an axis of heavy rain on the order of 3 to 6 inches
is expected from High Rock Lake and Lexington northeast across
the Triad and into the Kerr Lake area. Rainfall amounts will
be a notably less closer and to the south of the circulation
center across the Sandhills and southern Coastal Plain. Given
the forecast amounts and short duration, most of central NC
will be in a moderate to high risk of excessive rain and the
flash flood watch will remain in effect through 5 am Friday.

Its worth noting that the impacts from Michael may be more
significant than those of Florence across the Triad and
Triangle areas. The period of heavy rain will be more
concentrated and could contribute to flash flooding, especially
in urban areas and creeks susceptible to urban runoff issues
such as Crabtree and Buffalo. In addition, wind gusts on the
back side of the storm may this afternoon may be stronger than
those experience during Florence.

The heavy rain will quickly end from southeast to northeast
during the evening, with mainly dry conditions expected after
midnight. Skies will clear from the west to east, with just some
high clouds expected by daybreak. Highs today will range in the
mid 70s northwest to lower 80s in the east. Lows tonight will
range in the lower 50s northwest to around 60 in the east.
-Blaes

&&

.SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/...
As of 345 AM Thursday...

Friday will see Tropical Storm Michael head off to the northeast and
offshore very early Friday morning. In its wake, winds will turn to
northerly at the surface and cool continental high pressure will
start to build in from the west. Skies will clear fairly abruptly
behind the system so expect plenty of sunshine on Friday.
Temperatures will begin to cool off quickly and afternoon highs will
only reach the low to mid 70s which is much closer to normal for
this time of year. Lows Friday night will fall further than we have
seen in a while with parts of the Triad and VA border counties
possibly not making it to 50 degrees. Low 50s elsewhere.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
As of 345 AM Thursday...

Temperatures cool even more to start the weekend as a small
shortwave passes north of the area with the high moving over West
Virginia. Still cool and dry with highs in the upper 60s to low 70s.
In fact, the forecasted high of 68 at Greensboro on Saturday has not
been seen since late April. Saturday will be the cooler of the two
days this weekend with Sunday warming up as the high migrates
eastward and out to sea. Southeasterly return flow will help warm
temps up a couple degrees for Sunday afternoon. Overall a very dry
and pleasant weekend.

Early next week, a wave coming from the southwest will ride up a
cold front to our west and eventually develop a surface low along
the Appalachians and continue to the northeast. The associated cold
front will remain hung up to the west and could remain there through
Monday. Will bring in slight chance of pops Monday but will wait
till Tuesday to ramp up to chance as the front comes through.
Wednesday remains uncertain as the GFS lingers with the timing of
the frontal exit and keeps precipitation chances around for
Wednesday whereas the ECMWF clears out the front much quicker.
Temperatures during this time period will fluctuate with Monday
being the warmest day with southern locales in the low 80s but
cooling off again fro Tuesday and Wednesday with highs generally in
the low 70s.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
As of 730 AM Thursday...

24 Hour TAF Period: MVFR/IFR conditions are expected to continue
overnight in advance of Tropical Storm Michael, along with some
patchy light rain showers. Heavy rain and wind associated with
Tropical Storm Michael will spread into central NC generally from 12-
15Z in a west/southwest to east/northeast fashion, with generally
IFR cigs expected, with sub-VFR visbys. Meanwhile, winds will
strengthen with sustained winds of 15 to 25 kts, gusting to 30 to 40
kts at times, especially in the heavier bands. It also appears there
will be a period of LLWS at the Piedmont TAF sites, occurring at
KINT, KGSO and KRDU late afternoon/evening today as a strong 50 to
60kt NWLY low-level jet develops as Michael pushes off to the NE.

Rain will rapidly taper off and skies will clear out from SW to NE
between 00 and 06z Friday, though winds may remain gusty for a
longer time into the night.

Outlook: VFR conditions are expected to dominate for much of the Fri
through Mon period, with high pressure extending in from the NW,
although sub-VFR stratus/fog is possible late Sat night into early
Sun as a warm frontal zone briefly pushes northward into the region.
A little rain is possible late Sun into Mon ahead of a cold front
that will move in from the W late Mon.

&&

.RAH WATCHES/WARNINGS/ADVISORIES...
Tropical Storm Warning for NCZ007>011-021>028-038>043-073>078-
083>086-088-089.
Flash Flood Watch through late tonight for NCZ007>011-021>028-
038>043-073>078-083>086-088-089.

&&

SYNOPSIS...Hartfield
NEAR TERM...Hartfield/Blaes
SHORT TERM...Ellis
LONG TERM...Ellis
AVIATION...BSD

Hazardous Weather Outlook...UPDATED
National Weather Service Raleigh NC
1000 AM EDT Thu Oct 11 2018

NCZ007>011-021>028-038>043-076>078-088-089-121100-
Person-Granville-Vance-Warren-Halifax-Forsyth-Guilford-Alamance-
Orange-Durham-Franklin-Nash-Edgecombe-Davidson-Randolph-Chatham-Wake-
Johnston-Wilson-Lee-Harnett-Wayne-Cumberland-Sampson-
1000 AM EDT Thu Oct 11 2018

...TROPICAL STORM WARNING IN EFFECT...
...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...TORNADO WATCH 409 IN EFFECT UNTIL 9 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Tornado Watch.
   Flash Flood Watch.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.

NCZ073>075-083>086-121100-
Stanly-Montgomery-Moore-Anson-Richmond-Scotland-Hoke-
1000 AM EDT Thu Oct 11 2018

...TROPICAL STORM WARNING IN EFFECT...
...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed.