Severe Thunderstorm Warning 63, NWS Raleigh, NC

793 
WWUS52 KRAH 192114
SVSRAH

Severe Weather Statement
National Weather Service Raleigh NC
514 PM EDT FRI MAY 19 2017

NCC001-135-192130-
/O.CON.KRAH.SV.W.0063.000000T0000Z-170519T2130Z/
Alamance NC-Orange NC-
514 PM EDT FRI MAY 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL ALAMANCE AND ORANGE COUNTIES...

At 510 PM EDT, severe thunderstorms were located along a line 
extending from near Mebane to near Graham, north of Interstate 
40/85, moving east at 10 mph. The most intense storm along the line 
was located between Carr and Efland. Those in that area should 
prepare immediately for damaging wind gusts in excess of 60 mph. 

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Burlington, Graham, Hillsborough, Mebane, Elon College, Gibsonville,
Haw River, Swepsonville, Alamance and Carr.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Straight line winds can blow down trees, power lines, and damage
mobile homes and other buildings. Seek shelter in a sturdy structure
until the storm has passed. Stay away from windows as flying debris
generated by damaging winds can be deadly.

&&

LAT...LON 3624 7895 3602 7899 3596 7907 3597 7925
      3600 7954 3619 7953 3619 7946 3621 7945
      3621 7942 3625 7931
TIME...MOT...LOC 2110Z 271DEG 10KT 3615 7921 3609 7937 

HAIL...0.75IN
WIND...60MPH
 
$$

26

216 
WWUS52 KRAH 192126
SVSRAH

Severe Weather Statement
National Weather Service Raleigh NC
526 PM EDT FRI MAY 19 2017

NCC001-192134-
/O.CAN.KRAH.SV.W.0063.000000T0000Z-170519T2130Z/
Alamance NC-
526 PM EDT FRI MAY 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ALAMANCE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened and 
moved out of the warned area. Therefore, the warning has been 
cancelled.

LAT...LON 3624 7895 3602 7899 3596 7907 3597 7926
      3624 7926
TIME...MOT...LOC 2124Z 295DEG 10KT 3612 7915 

$$

NCC135-192130-
/O.CON.KRAH.SV.W.0063.000000T0000Z-170519T2130Z/
Orange NC-
526 PM EDT FRI MAY 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR ORANGE COUNTY...

At 524 PM EDT, a severe thunderstorm was located just west of 
Hillsborough and Schley, moving southeast at 10 mph. Those in that 
area should prepare immediately for damaging wind gusts in excess of 
60 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Hillsborough, Mebane, Carr, Efland, Schley and Eno River State Park. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Straight line winds can blow down trees, power lines, and damage
mobile homes and other buildings. Seek shelter in a sturdy structure
until the storm has passed. Stay away from windows as flying debris
generated by damaging winds can be deadly.

&&

LAT...LON 3624 7895 3602 7899 3596 7907 3597 7926
      3624 7926
TIME...MOT...LOC 2124Z 295DEG 10KT 3612 7915 

HAIL...<.75IN
WIND...60MPH
 
$$

26

Area Forecast Discussion
National Weather Service Raleigh NC
434 PM EDT Fri May 19 2017

.SYNOPSIS...
Surface high pressure off the Southeast coast will slip
southward into Saturday. A backdoor cold front will drop south
into Virginia tonight and then into North Carolina on Monday
and Monday night. The front will lift north as a warm front on
Sunday before a stronger cold front pushes eastward across the
region on Monday.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
As of 410 PM Friday...

Latest surface analysis shows a cold front dropping into the
Mid-Atlantic and the Ohio River area. A surface ridge of high
pressure is present well off the southeast coast. The pattern
aloft features a 590dm ridge centered just off the Florida east
coast and extending into the Carolinas.

Disturbances rotating around the southeast upper level ridge
have initiated deep convection in a moderately unstable airmass
across southwestern VA and northwestern NC. The airmass is much
more supportive of convection across northern NC where MLCAPE
values range near 2000 J/Kg with mid level lapse rates of 6.5
deg C/km or greater. Further south, the airmass is much less
unstable in proximity of the ridge. The convection will push
east during the late afternoon and evening hours and then begin
to wane with time after sunset. The convection should be largely
confined to northern portions of NC, north of U.S. 64, in the
better instability and forcing from the eastward advancing
shortwave. DCAPE values of 1000-1200 will support enhanced
downdrafts and cold pools which combined with deep layer shear
of around 20 to 25 kts will support some storm organization into
clusters or small line segments. A continuation of the local
damaging wind gust and hail threat will persist into the early
evening hours before the intensity wanes toward mid evening.

As this area of convection pushes east during the early
evening, convection allowing models suggest that another area
of showers associated with another disturbance in the westerly
flow aloft may move from the mountains into the western Piedmont
during the mid and late evening hours before weakening
overnight. Given the more widespread nature of the ongoing
convection, this seems less likely, so we have reduced overnight
PoPs. Overnight lows will generally range in in the mid to
upper 60s. -Blaes
&&

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
As of 350 PM Friday...

The forecast for Saturday and Saturday night largely dependent
on the timing and location of the backdoor cold front. Latest
guidance suggests that the southward advance of the front will
be even slower with the GFS more aggressive in the southward
positioning than the NAM and EC. Changes in the timing the front
will have significant impact on the sensible weather across
central NC.

At this point, the front is likely to reach the Roanoke Rapids
area between 1-3 pm, the Raleigh area between 2-5 pm, and then
stall across the western and southern portions of the CWA during
the evening. Along and ahead of the front, scattered to possibly
numerous showers and thunderstorms are expected. The severe
weather threat appears limited given the bulk shear values
around 20kts and more modest lapse rates than today. SPC
currently has our region in general thunder.

Given the more northward placement of the front, much more of
the region will be in the warm sector ahead of the front with
more sunshine, highs on Saturday will be warmer than previously
forecast in places such as Goldsboro, Raleigh, and Greensboro.
Highs Saturday should range near 90 across the Southern Piedmont
and Sandhills, the mid to upper 80s across the central Coastal
Plain as well as the much of the Triad and Triangle region with
highs in the lower 80s across the northern Coastal Plain.

The front will slow and eventually stall near the SC/NC border
Saturday evening/night with most of the convection waning during
the evening with the loss of heating but an isolated shower or
area of spotty rain/drizzle is possible behind the front where more
widespread cloudiness is expected. Low temperatures will range
in the lower 60s north to upper 60s south. -Blaes

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
As of 245 PM EDT Friday...

Mid-level ridge axis over the area will shift east and offshore on
Sunday, concurrent with scouring of weak cool air damming at the
surface due to increasing southerly flow. Instability supportive of
a few showers are expected along the periphery of the frontal
zone...mainly west and south...during the morning, with increasing
coverage areawide as the boundary retreats northeast during the
afternoon. The slowly retreating frontal zone will produce a strong
temperature gradient across the area...with the northern tier
reaching upper 70s while central and southern sections reach low to
mid 80s.

On Monday, a cold front associated with a longwave trough over the
central Conus will approach from the west and across central NC
during the afternoon. Showers and storms will accompany this front,
with likely PoPs in the west through early afternoon shifting to the
east through the afternoon and evening...with rain tapering off from
the west Monday night. Non-severe storms are expected, but could see
some storms become rather strong in an environment featuring modest
instability (<1K Joules CAPE) and shear (low level jet of 35-40
Kts), but favorable upper diffluence. Highs Monday will be hampered
across the west by cloudiness and earlier arrival of showers...mid
to upper 70s...while the east will have time to reach the lower 80s
along the I95 corridor before showers move in.

Uncertainty grows on Tuesday, with model divergence as to potential
for a wave to lift out of the gulf ahead of the now-amplifying
central US trof and into the area, which would initiate
convection in the southwest as early as Tuesday morning. The GFS
is much weaker and delays the Gulf return until Wednesday
morning. With low confidence, will follow a compromise with
chance PoPs in the south in the afternoon, with chance PoPs
spreading across the area overnight. A stronger cold front will
be moving in rapidly as the longwave trof axis rotates eastward,
passing across the area on Wednesday through Wednesday night.
Will have high chance PoPs, which will probably be increasing to
at least likely as the timing and details become more clear.
Highs Tuesday and Wednesday will be mainly in the upper 70s
north to lower 80s south.

Lingering showers associated with the upper low and subsequent
strong northwest flow aloft as the axis shifts east of the area will
give us a small chance of mainly diurnal showers and a few storms
both days, especially across the northern tier. Highs will be at
their lowers Thursday...low to mid 70s, warming to mid and
upper 70s on Friday.

&&

.AVIATION /21Z FRIDAY THROUGH WEDNESDAY/...
As of 250 PM Friday...

A couple of upper level disturbances will move across the
region producing isolated to scattered convection this afternoon
and evening across the northwestern and northern tier. Have
included a brief tempo period for thunderstorms at the KINT and
KGSO terminals prior to 23Z with a visibility restriction and
VFR cigs. Have added a shower to the KRDU terminal while keeping
the KRWI and KFAY terminals dry given the extremely limited
chance of precipitation. Outside of convection, a south-
southwesterly flow at 7 to 11kts is expected into the evening
with lighter winds after midnight. VFR skies are expected with a
few of mid and high-level sct cloud layers expected.

A cold front will drop southward out of Virginia on Saturday.
The front will produce a wind shift to the northeast and an area
of sct-bkn clouds with bases of 4-5kft. The timing of the front
is difficult, but the best forecast at this point puts the front
near KRWI around 17Z, RDU at 19Z and with the front stalling
near KGSO, KINT, and KFAY on Saturday evening. Scattered
convection is possible near and ahead of the front on Saturday,
but confidence in timing and location prohibits inclusion of
thunderstorms in the TAF at this time.

Outlook: The cold front will linger across central NC Saturday
afternoon into Saturday night before lifting north as a warm
front on Sunday. This feature will be accompanied by adverse
aviation conditions including scattered convection MVFR to IFR
ceilings near and especially behind the front. Another cold
front will sweep east across central NC on Monday and Monday
evening producing adverse aviation conditions in numerous
showers and thunderstorms. Quieter weather is expected on
Tuesday before the next cold front with widespread showers and
storms arrives on Wednesday.

&&

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

&&

SYNOPSIS...BLAES
NEAR TERM...BLAES
SHORT TERM...BLAES
LONG TERM...MLM
AVIATION...BLAES

Hazardous Weather Outlook
National Weather Service Raleigh NC
423 PM EDT Fri May 19 2017

NCZ007>009-021>025-038>040-202030-
Person-Granville-Vance-Forsyth-Guilford-Alamance-Orange-Durham-
Davidson-Randolph-Chatham-
423 PM EDT Fri May 19 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Tonight.

A few strong to severe thunderstorms are possible this afternoon.
The strongest storms may produce wind gusts in excess of 50 MPH and
large hail.

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

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ010-011-026>028-041>043-073>078-083>086-088-089-202030-
Warren-Halifax-Franklin-Nash-Edgecombe-Wake-Johnston-Wilson-Stanly-
Montgomery-Moore-Lee-Harnett-Wayne-Anson-Richmond-Scotland-Hoke-
Cumberland-Sampson-
423 PM EDT Fri May 19 2017

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Special Weather Statement
National Weather Service Raleigh NC
331 PM EDT FRI MAY 19 2017

NCZ021-192030-
Forsyth NC-
331 PM EDT FRI MAY 19 2017

...Strong thunderstorms approaching Winston-Salem from the
northwest...

At 327 PM EDT, Doppler radar was tracking strong thunderstorms
extending from Yadkinville to Pilot Mountain... moving east-
southeast at 10 mph.

These storms should affect northwest and west-central Forsyth County
through 400 PM, possibly reaching Winston-Salem by 400 PM.

Frequent lightning... very heavy rain... and wind gusts to 50 mph
will be possible with these storms.

Locations impacted include...
north west Winston-Salem, Clemmons, Bermuda Run, Lewisville, Rural
Hall, Stanleyville, Pfafftown and Belews Lake.

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.

&&

LAT...LON 3611 8051 3612 8046 3614 8044 3621 8045
      3622 8043 3624 8045 3626 8045 3626 8006
      3599 8026 3600 8032 3597 8040 3599 8042
      3601 8042 3603 8045 3606 8046 3604 8049
      3605 8051 3609 8052
TIME...MOT...LOC 1927Z 256DEG 11KT 3630 8044

pwb

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
418 PM EDT FRI MAY 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0408 PM     HAIL             WINSTON-SALEM           36.10N  80.26W
05/19/2017  E0.75 INCH       FORSYTH            NC   TRAINED SPOTTER

&&

EVENT NUMBER RAH1700534

TCC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
424 PM EDT FRI MAY 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 PM     HAIL             KERNERSVILLE            36.12N  80.08W
05/19/2017  E1.00 INCH       FORSYTH            NC   PUBLIC

&&

EVENT NUMBER RAH1700535

TCC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
436 PM EDT FRI MAY 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 PM     TSTM WND GST     PIEDMONT TRIAD APT      36.10N  79.94W
05/19/2017  M40 MPH          GUILFORD           NC   ASOS

&&

EVENT NUMBER RAH1700536

TCC

Special Weather Statement
National Weather Service Raleigh NC
437 PM EDT FRI MAY 19 2017

NCZ007-008-023-024-192130-
Alamance NC-Person NC-Granville NC-Orange NC-
437 PM EDT FRI MAY 19 2017

...Strong thunderstorms developing toward Burlington, Hillsborough,
and Roxboro...

At 433 PM EDT, Doppler radar was tracking strong thunderstorms over
Greensboro to near Elon to Yanceyville, moving east at 25 mph.
Thunderstorms will be moving into the Elon, Burlington, and Roxboro
areas between 430 and 500 PM.

Frequent lightning, nickel size hail, and wind gusts up to 50 mph
will be possible with these storms.

Heavy rain and minor flooding will also be possible with this storm.

Locations impacted include...
Chapel Hill, Burlington, Graham, Roxboro, Hillsborough, Carrboro,
Mebane, Elon College, Concord and Gibsonville.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3620 7880 3624 7880 3624 7895 3587 7901
      3588 7925 3585 7924 3584 7954 3625 7953
      3624 7915 3654 7914 3654 7876
TIME...MOT...LOC 2033Z 266DEG 22KT 3611 7946

PWB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
442 PM EDT FRI MAY 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0414 PM     TSTM WND DMG     2 W KERNERSVILLE        36.12N  80.12W
05/19/2017                   FORSYTH            NC   911 CALL CENTER

            TREE DOWN ON ROAD AND POWERLINES AT 5800 REGENTS PARK
            ROAD

&&

EVENT NUMBER RAH1700537

BLAES