Special Weather Statement, NWS Raleigh, NC

Area Forecast Discussion
National Weather Service Raleigh NC
205 PM EDT Fri Mar 31 2017

.SYNOPSIS...
A cold front will sweep east across the area this afternoon and
evening. High pressure will then build into the Mid-Atlantic and
Southeast through the weekend. A storm system will develop across
the lower Mississippi Valley on Monday and push into the Mid-
Atlantic on Tuesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
As of 205 PM Friday...

A front aligned along the foothills will be moving into the western
piedmont (Triad area) within the next hour or so  and progress east
across central NC, exiting the coastal plain by 00Z. Partial
clearing by late morning allowed instability to increase, especially
across the south where temperatures are in the mid 70s and MUCAPE
around 1000 Joules. Deep layer moisture has moved east of the area,
so expect considerably less convective coverage this
afternoon/evening, but storms should be deeper and potentially
stronger than the high shear/low CAPE storms we dealt with this
morning. Shower/storm coverage will diminish progressively southward
where upper dynamic support is weaker with increasing range from the
upper low. Winds are gusting 20 to 25 ahead of the front, and will
shift to west then northwest this evening and early tonight with
gustiness abating by midnight. Mins will benefit from mixing to
offset clearing skies and lows will bottom out in the upper 40s to
low 50s.

&&

.SHORT TERM /SATURDAY AND SATURDAY NIGHT/...
As of 205 PM Friday...

The upper trough axis will be exiting the coast tomorrow morning
with heights rising modestly in northwest flow. Subsidence and dry
airmass settling into place will produce mostly clear skies with
perhaps some thin high cloudiness in the fast flow aloft. Highs
still progged to reach near 70 north to mid 70s south with mins
Saturday night radiating down to the seasonable mid 40s over most of
the area.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
As of 205 PM Friday...

Expect nice weather with seasonable temps on Sunday with a ridge
over the southeast. The next weather-maker will be a closed mid
level low progged to move from the lower Miss Valley northeastward
and across the Ohio Valley during the Mon-Tue time-frame.  A short
wave embedded within the sw flow ahead of the closed low is progged
to move across our area late Monday and Monday night, giving us a
chance for showers and tstms during that time. On Tuesday, the assoc
cold front will move through, giving us a chance for showers during
the daytime, followed by clearing Tuesday  night in the wake of the
front. Ahead of the front, look for temps to climb above normal for
the early week period.

Dry weather and seasonable temps expected Wed and Wed night with
short wave ridging over the area. Both GFS and ECMWF indicate a
deeper sharper trough for the late-week period, but differ in
details regarding precip timing.  So for that part of the forecast,
will maintain POPS at or slightly above climo, with temps at or a
little cooler than normal due to cloud cover and precip chances.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
As of 140 PM Friday...

24 Hour TAF Period: A cold front will be sweeping across central NC
this afternoon and early evening, accompanied by a line of
convection which will be more widespread across the northern tier.
Expect showers/possible thunderstorms to move across the Triad
(INT/GSO) between 18-22Z accompanied by MVFR conditions and
southwest winds gusting as high as 25 knots, which will shift to
west or northwest behind the front. The front and convection will
progress across the area, affecting RDU and RWI between 20 and 00Z,
with clearing skies and winds shifting to west or northwest by 00Z
across the area. West to northwest winds will diminish to 10 knots
or less by 03Z. VFR conditions are on tap for tomorrow, with
northwest winds picking up to 10 to 15 knots and gusting to 20 knots
by late morning.

Long term: The next low pressure system will move through the area
Monday night through Tuesday accompanied by a chance for adverse
aviation conditions. A third system will move across the area
towards the end of next week.

&&

.RAH WATCHES/WARNINGS/ADVISORIES...
None.

&&

SYNOPSIS...mlm
NEAR TERM...mlm
SHORT TERM...mlm
LONG TERM...np
AVIATION...mlm

Hazardous Weather Outlook
National Weather Service Raleigh NC
402 PM EDT Fri Mar 31 2017

NCZ021>028-038>043-073>078-083>086-088-089-010930-
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-
402 PM EDT Fri Mar 31 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

A powerful storm system will cross the area early next week,
bringing a risk of strong to possibly severe thunderstorms, mainly
Monday evening through early Tuesday morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ007>011-010930-
Person-Granville-Vance-Warren-Halifax-
402 PM EDT Fri Mar 31 2017

...TORNADO WATCH 105 IN EFFECT UNTIL 10 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Tonight.

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

   Tornado Watch.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

A powerful storm system will cross the area early next week,
bringing a risk of strong to possibly severe thunderstorms, mainly
Monday evening through early Tuesday morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is anticipated through early evening, mainly
across the northeast Piedmont and northern coastal plain.

Special Weather Statement
National Weather Service Raleigh NC
320 PM EDT FRI MAR 31 2017

NCZ008>011-312000-
Vance NC-Warren NC-Halifax NC-Granville NC-
320 PM EDT FRI MAR 31 2017

...A strong thunderstorm will affect portions of northern Vance...
northern Warren...northwestern Halifax and northeastern Granville
Counties Until 400 PM EDT...

At 317 PM EDT, Doppler radar was tracking a strong thunderstorm 8
miles southeast of Clarksville, or 14 miles north of Henderson,
moving northeast at 35 mph.

Dime size hail and wind gusts up to 40 mph will be possible with this
storm.

Other storms likely producing pea size hail and wind gusts to 40 mph
were located north of Littleton, and west of Macon.

Locations impacted include...
Roanoke Rapids, Norlina, Littleton, Weldon, Macon, Steele Creek
Marina & Campground, Kerr Lake, Wise, Lake Gaston and Southpointe And
Morningstar Marinas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near Lake Gaston, get off of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3651 7790 3650 7782 3648 7776 3649 7773
      3648 7768 3643 7759 3640 7852 3654 7859
      3654 7790
TIME...MOT...LOC 1917Z 244DEG 29KT 3653 7848

WSS

Special Weather Statement
National Weather Service Raleigh NC
405 PM EDT FRI MAR 31 2017

NCZ007-008-312100-
Person NC-Granville NC-
405 PM EDT FRI MAR 31 2017

...A strong thunderstorm will affect portions of Person and Granville
Counties Until 500 PM EDT...

At 404 PM EDT, Doppler radar was tracking A strong thunderstorm near
Leasburg, or near Yanceyville, moving east at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Oxford, Roxboro, Concord, Stovall, Mayo Reservoir, Bethel Hill, Bushy
Fork, Hyco Lake, Tungsten and Moriah.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter in a nearby building or vehicle. Wind gusts as high as
50 mph are capable of knocking down small or weakened trees and
blowing around trash cans, potted plants, lawn furniture and other
light outdoor objects.

Doppler radar has indicated weak rotation with this storm. If the
storm intensifies and rotation strengthens, a warning may need to be
issued.

&&

A tornado watch remains in effect until 1000 PM EDT for central North
Carolina.

LAT...LON 3654 7847 3652 7847 3651 7850 3646 7851
      3623 7851 3624 7915 3654 7914
TIME...MOT...LOC 2004Z 264DEG 37KT 3641 7922

10

Special Weather Statement
National Weather Service Raleigh NC
428 PM EDT FRI MAR 31 2017

NCZ011-312045-
Halifax NC-
428 PM EDT FRI MAR 31 2017

...A strong thunderstorm will affect portions of north central
Halifax County Until 445 PM EDT...

At 427 PM EDT, Doppler radar was tracking a strong thunderstorm near
Halifax, moving northeast at 30 mph.

Dime size hail and wind gusts up to 40 mph will be possible with this
storm.

Locations impacted include...
Roanoke Rapids, Halifax, Weldon and South Weldon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter in a nearby building or vehicle. Wind gusts as high as
40 mph are capable of knocking down tree limbs and blowing around
trash cans, potted plants, lawn furniture and other light outdoor
objects.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 1000 PM EDT for
portions of central North Carolina.

LAT...LON 3642 7759 3642 7756 3641 7755 3637 7755
      3635 7758 3634 7759 3631 7757 3630 7755
      3632 7745 3632 7744 3631 7743 3622 7770
      3639 7779 3646 7763
TIME...MOT...LOC 2027Z 244DEG 25KT 3634 7768

WSS

Special Weather Statement
National Weather Service Raleigh NC
448 PM EDT FRI MAR 31 2017

NCZ009-010-312130-
Vance NC-Warren NC-
448 PM EDT FRI MAR 31 2017

...A strong thunderstorm will affect portions of northern Vance and
northern Warren Counties Until 530 PM EDT...

At 446 PM EDT, Doppler radar was tracking A strong thunderstorm 7
miles south of Clarksville, or 14 miles east of Virgilina, moving
east at 40 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Deadly cloud to ground lightning will also be possible with this
storm.

Locations impacted include...
Norlina, Middleburg, Macon, Steele Creek Marina & Campground, Kerr
Lake, Wise, Southpointe And Morningstar Marinas, Satterwhite Point
Marina and Tungsten.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter in a nearby building or vehicle. Wind gusts as high as
50 mph are capable of knocking down small or weakened trees and
blowing around trash cans, potted plants, lawn furniture and other
light outdoor objects.

Dont wait until you see the first lightning flash before heading to
safety. Move indoors at the first sign of threatening skies or the
first sound of thunder. Deadly lightning strikes can occur well ahead
of an approaching storm, prior to the arrival of rain and wind. Make
sure that lightning is well away from your location before resuming
outdoor activity.

If on or near Kerr and Gaston Lake, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

&&

A tornado watch remains in effect until 1000 PM EDT for central North
Carolina.

LAT...LON 3642 7793 3638 7851 3646 7851 3651 7850
      3654 7844 3655 7796
TIME...MOT...LOC 2046Z 263DEG 36KT 3652 7852

77

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