NWS Newport/Morehead City, NC wrote its last area forecast discussion before the first event at May 12, 7:02 PM EST, 4 hours 50 minutes earlier.
Area forecast discussion, May 12, 7:02 PM EST, 4 hours 50 minutes before
Area Forecast Discussion
National Weather Service Newport/Morehead City NC
Issued by National Weather Service Wilmington NC
802 PM EDT Mon May 12 2025
.SYNOPSIS...
A slow moving low will continue to bring an extended period of
unsettled weather to the area through mid week. This system will
eventually weaken and dissipate by then, with a ridge of high
pressure building in behind it by late week.
&&
.NEAR TERM /THROUGH TUESDAY/...
As of 345 PM Monday...An upper level low over the Deep South
is becoming negatively tilted today allowing for deep moist
convergence across ENC. Increasing lapse rates in the vicinity
of the upper level low has enabled sufficient instability
despite only tepid surface heating. ML CAPE vals only in the 500
to 1,000 J/KG range based on latest RAP analysis. However,
solid low level shear with veering of winds has allowed for some
briefly rotating storms to form within the band of rain. This
is expected to continue through the remainder of the evening
into tonight as low level veering of winds persists. High PW's
approaching 2" will continue to pose a threat for areas of
heavy rain, esp where some banding of heavy showers or storms
occur. Already we have received reports of over 5" of rain in
portions of Onslow county from today's convection. A long
standing moderate drought is in place across most of ENC, so no
severe flooding is expected, although some roads being shut down
isn't out of the question. Expanded the flood watch to encompass
the entire CWA with this update, with additional bands of
rainfall tonight and tomorrow gradually shifting north and east.
A break in the heavier rain rates through first part of the
evening, before reinvigoration of heavier rain rates arrives
after 6Z with frontal forcing arriving first in the Coastal
Plain counties, and then further east towards daybreak Tue.
Heavy rain rates will return through late tonight for SW areas.
Additional rainfall of 1-3" is expected, with isolated totals of
4+ inches possible where heavier bands set up shop.
&&
.SHORT TERM /TUESDAY NIGHT THROUGH 6 PM TUESDAY/...
As of 4 PM Monday...The axis of greatest moisture will become more
progressive through the day on Tuesday, shifting the area of
heaviest rain from the southwestern counties in the morning to the
OBX by the afternoon. Given PWATs around 2" and the heavy rain
already occurring ahead of Tuesday's round, flooding will be a
concern. Have expanded the flood watch to include the entire CWA
for the heavy bands of rain moving through the region. The
antecedent surface conditions will work in our favor given the
ongoing drought, but efficient rain rates may still cause
issues. The new flood watch is until 5AM, although south and
west portions of the watch may be dropped earlier as the final band
moves east.
There is also a low end threat of a brief spin up and strong
wind gusts, especially along the coastal plain, Tuesday
afternoon and evening. Sufficient instability and veering of
winds at the lowest levels should cause some storms to rotate.
The uncertainty is on the coverage of storms, as mid layer
subsidence may prevent the storms from strengthening. If we
observe rotation, any tornadoes that may occur will likely be
very weak and brief in nature.
&&
.LONG TERM /TUESDAY NIGHT THROUGH MONDAY/...
As of 3 PM Monday...
Aloft: By late Wednesday, upper low will become absorbed into
the shortwave across the Mid-Atlantic states. The axis of the
upper trough will traverse ENC late Wednesday/early Thursday
with weak upper ridging briefly building in it's wake. A weak,
quick hitting shortwave will pass Friday night followed by
another, slightly stronger shortwave on Saturday with zonal flow
taking over on Sunday.
Surface: The warm front associated with a surface low will lift
north across ENC Tuesday into Wednesday, putting us firmly in
the warm sector. From there, the next FROPA won't be until
Saturday, although not much of an airmass change is expected.
Tuesday night - Wednesday...We get dry slotted Tuesday night,
which may keep portions of the CWA completely dry through
Tuesday night into Wednesday morning. Wednesday afternoon
however, ample instability and upper level forcing will remain
in the area on Wednesday, which will support the continuation of
likely to categorical PoPs. Thunderstorms will be likely in the
afternoon, especially along any seabreeze boundary. And with a
slightly drier column, rain rates will not be as efficient as
they will be on Tuesday.
Thursday - Sunday...Towards the end of the week, we'll return to a
typical summertime pattern with daily chances of isolated to widely
scattered showers and thunderstorms. Temperatures will steadily
climb through the week, reaching the 90s across the coastal plain
Friday and Saturday. These temps, accompanied by dews in the low-
70s, will generate heat indices ranging from 95-100+.
&&
.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
SHORT TERM /through 0Z Wednesday/...
As of 8 PM Monday...A mixed bag of observed flight categories
right now as bands of heavy rain move through the region.
Lightning chances are generally confined to the coast where
instability is the greatest. A break in the heavier showers
early tonight, with flight conditions becoming generally MVFR to
even briefly VFR, before heavy showers, and possible
thunderstorm chances, return from the west late tonight into
Tuesday. This will result in a second drop in conditions to
IFR/LIFR, likely around or after 6Z Tuesday. Bands of rain shift
NE through the day Tuesday, with dry slot moving into the
region. This greatly reduces shower and tstorm coverage Tuesday
afternoon/evening for inland locales. VFR conditions are
expected to return Tuesday afternoon into evening hours as low
clouds scatter out from SW to NE.
LONG TERM /Tuesday afternoon through Friday/...
As of 3:50 AM Monday...Prolonged periods of sub-VFR conditions
are possible throughout the period given the active pattern at
play. The heaviest rain will occur on Tuesday, but daily chances
for showers and thunderstorms will persist.
&&
.MARINE...
SHORT TERM /through Tuesday/...
As of 4 PM Tuesday...Winds will be generally SE at 15-25 kts
through tonight then becoming 20-30 kt Tuesday afternoon. Seas
4-6 ft this afternoon become 5-7 ft tonight. and 6-8 ft Tuesday
before beginning to abate Tuesday night.
LONG TERM /Tuesday night through Friday/...
As of 430 PM Monday...By Wednesday morning, the winds will have
veered to the southwest, decreasing to 5-15 kt and seas
dropping to 3-4 ft. Pleasant boating conditions for the end of
the work week.
&&
.HYDROLOGY...
As of 4 PM Mon...Already 2-6" have fallen where the band of
rainfall has moved through today. An additional 1-3" of
rainfall is expected throughout the CWA, with isolated values of
4"+ through Tuesday night. A Flood watch is now in effect for
the entire CWA.
&&
.EQUIPMENT...
Due to a system upgrade, NOAA Weather Radio from the following
transmitters will be off the air starting 730 AM Monday May 12th
through Wednesday May 14th.
New Bern, NC, KEC84 at 162.400 MHz.
Cape Hatteras, NC, KIG-77 at 162.475 MHz.
Marnie, NC, WWH-26 at 162.425 MHz.
Warsaw, NC, KXI-5 at 162.425 MHz.
Visit www.weather.gov/mhx for the latest forecast information
during the temporary outage. Our internet will NOT be impacted
by the upgrade.
&&
.MHX WATCHES/WARNINGS/ADVISORIES...
NC...Flood Watch through late Tuesday night for NCZ029-044>047-080-
081-094-193>196-203>205.
Flood Watch through Tuesday afternoon for NCZ079-090>092-198-
199.
Beach Hazards Statement from 6 AM EDT Tuesday through Tuesday
evening for NCZ195-196-199-203>205.
MARINE...Small Craft Advisory from 2 AM to 8 PM EDT Tuesday for AMZ135.
Small Craft Advisory from 7 AM Tuesday to 4 AM EDT Wednesday
for AMZ150.
Small Craft Advisory until 8 AM EDT Wednesday for AMZ152-154.
Small Craft Advisory until 4 AM EDT Wednesday for AMZ156-158.
Small Craft Advisory from 5 AM to 8 PM EDT Tuesday for AMZ231.
&&
SYNOPSIS...MHX
NEAR TERM...RJ
SHORT TERM...RJ
LONG TERM...OJC/RJ
AVIATION...RJ/VAO
MARINE...OJC/RJ
HYDROLOGY...MHX
EQUIPMENT...MHXSpecial weather statement, May 12, 11:06 PM EST, 46 minutes before
Special Weather Statement
National Weather Service Newport/Morehead City NC
Issued by National Weather Service Wilmington NC
1206 AM EDT Tue May 13 2025
NCZ092-195-198-199-130430-
Coastal Onslow NC-West Carteret NC-Jones NC-Inland Onslow NC-
1206 AM EDT Tue May 13 2025
...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF JONES...
ONSLOW AND WESTERN CARTERET COUNTIES THROUGH 1230 AM EDT...
At 1205 AM EDT, Doppler radar was tracking a strong thunderstorm over
Silverdale, or near Piney Green, moving northwest at 25 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Stella, Maysville, Silverdale, Belgrade, and Deppe.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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.
&&
LAT...LON 3477 7714 3474 7722 3491 7736 3497 7724
TIME...MOT...LOC 0405Z 153DEG 21KT 3480 7722
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
TRA