Wednesday, January17, 2018 L-36.com


Marine Weather and Tides
Montrose, VA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:20AMSunset 5:19PM Wednesday January 17, 2018 4:06 AM EST (09:06 UTC) Moonrise 7:39AMMoonset 6:00PM Illumination 0% Phase: New Moon; Moon at 1 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ636 York River- 347 Am Est Wed Jan 17 2018
Through 7 am..NW winds 5 to 10 kt. Waves 1 foot.
Today..N winds 10 to 15 kt. Waves 1 to 2 ft. A chance of snow early in the morning, then snow in the late morning and afternoon with vsby 1 to 3 nm.
Tonight..NW winds 15 kt...diminishing to 10 to 15 kt late. Waves 1 to 2 ft. Snow early in the evening.
Thu..W winds 10 to 15 kt. Waves 1 to 2 ft.
Thu night..W winds 5 to 10 kt. Waves 1 foot.
Fri..SW winds 5 kt. Waves 1 foot.
Fri night..SW winds 5 kt. Waves 1 foot.
Sat..SW winds 5 to 10 kt. Waves 1 foot.
Sat night..SW winds 5 to 10 kt. Waves 1 foot.
Sun..SW winds 5 kt. Waves 1 foot.
ANZ600 347 Am Est Wed Jan 17 2018
Synopsis for fenwick island de to currituck beach light nc out 20 nautical miles including virginia portion of the chesapeake bay currituck sound and portions of the james, york, and rappahannock rivers.. A cold front crosses the area this morning with low pressure moving northeast along the coast this afternoon and tonight. A second surge of arctic air pushes across the area tonight into Thursday before temperatures moderate into this weekend.

7 Day Forecast for Marine Location Near Montrose, VA
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location: 37.53, -77.42     debug


Area Discussion for - Wakefield, VA
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Fxus61 kakq 170732
afdakq
area forecast discussion
national weather service wakefield va
232 am est Wed jan 17 2018

Synopsis
High pressure will slide offshore tonight. A cold front crosses
the area Wednesday morning with low pressure moving northeast
along the coast Wednesday afternoon and night. A second surge of
arctic air pushes across the area Wednesday night into Thursday
before temperatures moderate into next weekend.

Near term through today
Update... Main change this cycle was to upgrade portions of
south central va and northampton nc to a winter storm warning
and added northampton co. Va to a winter wx advisory.

Evening analysis indicates a potent positively tilted upper
trough all the way south into the lower ms tn valley. Frigid
airmass down into the south central CONUS today and this will
continue to migrate eastward tonight. In the near term tonight,
low clouds and some patchy fog will persist near the coast and
eastern shore while most of the remainder of the CWA is mainly
cloudy with mid high clouds thickening in advance of the
approaching system. Lows tonight will be mainly in the mid 20s
to around 30 f.

The upper trough will pivot ese and is progged to take on more
a neutral tilt with the associated cold front pushing across the
mountains and into the piedmont well after midnight, genly by
09-12z Wednesday. The upper level is then progged to take on a
negative tilt or even become cutoff for a time during the day
wed. This will place a narrow zone from central nc to south
central va into optimal placement for deformation banding within
a deep upper level diffluent zone. Have raised snow amounts to
3-5" within the warning area and locally higher amounts will be
possible especially if the upper feature were to slow down
further.

Previous discussion... The vigorous upper level feature will
continue to trundle ewd across the region Wednesday as the cold
front gradually pushes through the region with snow
overspreading the region and affecting the commute Wednesday
morning across WRN and central portions. Pcpn could briefly
begin as rain, especially toward the coast. 16 12z
gfs ECMWF nam cmc demonstrate decent agreement with this
feature, with some slight timing differences in the latter
stages, mainly 18-00z Wednesday with the ECMWF cmc slightly
slower. Given this, pops have been increased to categorical
across the piedmont after 06z tonight into midday Wednesday, and
for central and s- central va Wednesday morning. Likely pops
have been maintained for SE va NE nc, with likely pops for the
middle peninsula northern neck lower ERN shore tapering to chc
for the lower md ERN shore.

Overall, not much has changed with the synoptic weather
details preferences in the near and short term. Have gone ahead
and extended winter weather advisories east to include all zones
west of the chesapeake bay, including for the hampton roads area
for their evening commute. Have held out accomack northampton
for now with accumulations ~1" and some mixed pcpn expected.

12z 16 suite once again have trended slightly slower and upward
with qpf. Have nudged forecast snow totals up slightly from the
peninsula into tidewater hampton roads areas. Model consensus
supports QPF of 0.25-0.35" across the piedmont and s-central va
and northampton nc, bordered by ~0.1 to 0.2" from central va to
e va and NE nc, with 0.1" or less over the lower eastern shore.

Expect some variability in slrs, but generally ratios of 12-15:1
are expected during the highest pops, which supports 2-4" of
snow across the piedmont, with 1-3" for the i-95 corridor of
central and s-central va into northampton nc.

Confident in period of moderate snow inland, given well-modeled
narrow band of negative epv dropping over the SW zones in the
piedmont (i-85 corridor). There could be a very narrow corridor
of 4-6" of snow in this band. However, expect this would be very
localized and hard to pin- down, so there is no need for a
watch or warning at this time. Slightly less confident into se
va. To reiterate... We have issued a winter weather advisory
over hampton roads for the late morning and afternoon. However,
we are still a bit concerned with sharpening axis of f-gen oprh
depicted by the 12z (and now 18z) high-res nam. Issue will be
that we will have a very narrow window within which to receive
moderate snows into tidewater area, before best axis of moisture
slides offshore. Potential is there for warning criteria snows
(and criteria is 3" for SE va). However, after collaboration
with neighboring offices and wpc, will hold off with warning for
now. Narrow window of potential snowfall is the primary issue.

Should later model runs continue to depict this potential, an
upgrade to a winter storm warning for all or part of the hampton
roads area may be needed.

High temperatures will generally be 30-35f, but will likely
fall into the mid upper 20s across the NW half of the area by
early aftn and to the upper 20s around 30f elsewhere by mid late
aftn.

Short term tonight through Thursday night
The sky will clear quickly Wednesday night as well-advertised
quick shot of arctic air surges into the region. Shallow mixing
is expected to persist overnight, which should inhibit
temperatures from plummeting too far. Still cold nonetheless
with lows in the teens inland to the upper teens low 20s for
coastal SE va NE nc. Mid-level WAA resumes rather quickly
Thursday with 850mb temperatures of -2 to -4c at 12z warming to
+4-6c by 21z. A cold start to the day, limited mixing, and mid-
level WAA should result in rather stable lapse rates and surface
high temperatures Thursday should only reach the upper 30s to
low 40s.

Long term Friday through Tuesday
Pattern change looks to occur during the medium range period with a
significant warmup expected through the upcoming weekend early next
week. It will still be on the cold side early Fri morning with sfc
high pressure centered across the deep south, and one last upper
trough moving ese to the new england coast. Latest gfs ECMWF cmc
depict the upper trough moving well off the new england coast fri
with a broad upper level ridge building over the eastern CONUS fri
aftn through the weekend. Expect continued dry conditions with
warming temperatures, highs in the upper 40s lower 50s fri, rising
well into the 50s (possibly near 60f) sat, and into the upper 50s to
lower 60s for sun. Lows Fri night Sat am in the mid 20s to mid 30s,
and Sat night Sun am in the 30s to around 40f. Minor timing
differences arise by Mon between the models, but the overall trend
is for a slower arrival of the cold front and with the upper pattern
amplifying quite a bit this makes sense. Expect increasing clouds
ahead of the next front Sun night but have genly slowed down the
main chance for for showers until Mon aftn Mon night. Mild with lows
in the 40s Sun night Mon am and highs Mon mainly in the 60s (could
even be near 70f in the SE if more Sun develops and the precip is
slower to arrive). High chc pops for now 40-50% all zones Mon night.

The ECMWF is slower by this time than the GFS cmc so will linger
pops through 12z. Drying out becoming partly-mostly sunny Tue with
highs mainly in the 50s.

Aviation 08z Wednesday through Sunday
Complex scenario overnight with fog low ceilings confined mainly
to the waters and right at the coast. Conditions look to
improve as we head through the early morning hours with even the
potential for a brief return toVFR conditions this morning.

MainlyVFR conditions are anticipated inland for the time being.

Expect widespread flight restrictions on Wed in snow as clipper
and associated cold front crosses the region. Kric will likely
experience the worst conditions from 12-18z while korf kphf kecg
will lag behind by several hrs with worst conditions not
starting until between 15-18z and lasting through most of the
remainder of the TAF period. Ksby will overall see only light
snow showers with vsbys down to about 2sm. Winds will be from
the N and gust to 20-25kt near the coast by aftn.

Outlook: clearing Wed night with breezy N winds near the coast.

PredominateVFR then likely thu-sat as the trough ejects ne
offshore.

Marine
Light winds and saturated conditions this evening over portions
of the bay and southern va coastal waters. Cams show limited
vsbys over these waters and raised a marine dense fog advisory
through the evening hrs.

High pressure will slide into the atlc this evening. A surface
cold front crosses the the coast late tonight into Wed morning,
with strong CAA lagging behind until the upper trough arrives
wed evening into thu. Nnw winds increase to 15 to 25 knots wed
aftn evening with gusts up to or arnd 30 kt, esply later wed
evening and Wed night, as the storm system moves out to sea and
high pressure starts to build back in fm the west. Scas are in
effect over the coastal waters into Thu aftn, with scas for the
ches bay and currituck snd now in effect fm Wed morning (7-10
am) into Thu morning (7-10 am). High pressure settles over the
area later Thu aftn into sat, then slides off the SE coast
sun.

Akq watches warnings advisories
Md... None.

Nc... Winter weather advisory from 6 am this morning to 6 pm est
this evening for ncz013-014-030.

Winter weather advisory from 10 am this morning to 9 pm est
this evening for ncz015>017-031-032-102.

Winter storm warning until 6 pm est this evening for ncz012.

Va... Winter weather advisory until 3 pm est this afternoon for
vaz048-060>062-069-509-510.

Winter weather advisory from 6 am this morning to 6 pm est
this evening for vaz084-086-088>090-092-093-096-523>525.

Winter weather advisory from 10 am this morning to 9 pm est
this evening for vaz095-097-098-100.

Winter weather advisory until 6 pm est this evening for vaz064-
067-068-075>078-080>083-085-511>522.

Winter storm warning until 6 pm est this evening for vaz065-
066-079-087.

Marine... Small craft advisory until 1 pm est Thursday for anz650-652-
654-656-658.

Small craft advisory from 7 am this morning to 7 am est
Thursday for anz630>632.

Dense fog advisory until 7 am est this morning for anz633-658.

Small craft advisory from 7 am this morning to 10 am est
Thursday for anz634.

Small craft advisory from 10 am this morning to 7 am est
Thursday for anz633-638.

Synopsis... Mam
near term... Lkb mam
short term... Mam
long term... Lkb
aviation... Ajb lkb
marine... Tmg


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
YRSV2 - Chesapeake Bay,VA 38 mi96 min WSW 1 29°F 1027 hPa27°F
YKTV2 - 8637689 - Yorktown, VA 54 mi48 min WNW 2.9 G 4.1 32°F 35°F1025.6 hPa

Wind History for Yorktown USCG Training Center, VA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Richmond, Richmond International Airport, VA6 mi72 minNNE 510.00 miOvercast35°F26°F70%1026 hPa
Ashland, Hanover County Municipal Airport, VA12 mi72 minVar 310.00 miOvercast34°F26°F73%1026.4 hPa
Petersburg, Dinwiddie County Airport, VA24 mi64 minN 010.00 miOvercast32°F26°F80%1025.7 hPa

Wind History from RIC (wind in knots)
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Last 24hrCalmSE3E3SE3NW4E3Calm3SE3S4SE4SE6SW3CalmCalmCalmCalmCalmCalmCalmCalmN3N5N6
1 day agoN9N9N8N7N10N9NW8N8NW8NE7N6N5NE5NE6NE5NE3E3CalmE3CalmNW4NW3CalmNE3
2 days agoN12
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Tide / Current Tables for Richmond (river locks), James River, Virginia
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Richmond (river locks)
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Wed -- 04:46 AM EST     2.78 feet High Tide
Wed -- 07:22 AM EST     Sunrise
Wed -- 07:38 AM EST     Moonrise
Wed -- 11:38 AM EST     -0.18 feet Low Tide
Wed -- 04:55 PM EST     3.08 feet High Tide
Wed -- 05:17 PM EST     Sunset
Wed -- 06:00 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.20.31.32.12.62.82.51.91.20.60.2-0.1-0.10.41.42.32.93.12.92.31.71.10.50.1

Tide / Current Tables for Richmond Deepwater Terminal, James River, Virginia
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Richmond Deepwater Terminal
Click for Map
Wed -- 04:15 AM EST     2.84 feet High Tide
Wed -- 07:22 AM EST     Sunrise
Wed -- 07:38 AM EST     Moonrise
Wed -- 11:01 AM EST     -0.12 feet Low Tide
Wed -- 04:23 PM EST     3.16 feet High Tide
Wed -- 05:17 PM EST     Sunset
Wed -- 06:00 PM EST     Moonset
Wed -- 11:46 PM EST     -0.12 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.91.82.52.82.72.21.60.90.40-0.10.1122.83.13.12.72.11.40.80.30

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Wakefield, VA (4,6,7,8)
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Ground Weather Radar Station Wakefield, VA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.