Ashton-Sandy Spring, MD Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Ashton-Sandy Spring, MD


November 28, 2023 6:12 AM EST (11:12 UTC)
Sunrise 7:03AM   Sunset 4:48PM   Moonrise  5:36PM   Moonset 8:36AM 

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. Privacy and Cookie policy

Marine Forecasts
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ANZ538 Patapsco River Including Baltimore Harbor- 334 Am Est Tue Nov 28 2023
.small craft advisory in effect until 6 am est early this morning...
.gale warning in effect through this afternoon...
.small craft advisory in effect from this evening through Wednesday morning...
Rest of the overnight..W winds 10 kt with gusts to 20 kt. Waves 1 ft.
Today..W winds 15 to 20 kt. Gusts up to 30 kt... Increasing to 35 kt in the afternoon. Waves 2 ft.
Tonight..W winds 10 to 15 kt. Gusts up to 30 kt... Diminishing to 20 kt after midnight. Waves 1 to 2 ft.
Wed..SW winds 5 to 10 kt. Waves 1 ft.
Wed night..SW winds 5 to 10 kt. Waves 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Thu night..S winds 10 kt with gusts to 20 kt. Waves 1 ft.
Fri..SW winds 10 kt...becoming nw after midnight. Waves 1 ft. Rain through the day, then a chance of rain through the night.
Sat..NE winds 5 to 10 kt. Waves 1 ft.

ANZ500 334 Am Est Tue Nov 28 2023
Synopsis for the tidal potomac and md portion of the chesapeake bay..
high pressure gradually builds toward the waters through tonight. Hazardous marine conditions expected through Tuesday evening, with small craft advisories likely needed through Wednesday morning. Another frontal system moves through the area by late in the week, with small craft advisories possible Thursday night and Friday. High pressure returns briefly Saturday before another front arrives Sunday into early next week.


7 Day Forecast for Marine Location Near Ashton-Sandy Spring, MD
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Area Discussion for - Baltimore, MD/Washington
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NOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 280836 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 336 AM EST Tue Nov 28 2023

SYNOPSIS
The coldest air by far this season arrives today as a cold front passes through the region. The front will produce another round of gusty winds this afternoon and evening along with additional mountain snow showers. High pressure builds over the region Wednesday before sliding offshore Thursday allowing temperatures to warm. The next chance for precipitation arrives with a front and area of low pressure later this week.

NEAR TERM /THROUGH TONIGHT/
The coldest air by far this Winter season and this year (since February 25, 2023) looks to arrive today as a mid/upper level trough swings through the region. Expect a steady of supply of cold air advection throughout the day on gusty northwest flow. Highs will struggle to reach into the mid to upper 30s east of the Blue Ridge with high temperatures at or below freezing west of the I-81 corridor. Mountain locations west of the Allegheny Front will struggle to get of teens throughout much of the day.

The winds will make it feel much worse especially as we get into the late morning and afternoon hours as the trough passes. Expect sustained northwest winds between 10 to 20 mph throughout much of the day with gusts between 30 to 35 mph. Mountain locations will see sustained winds between 15 to 25 mph with gusts up to 45 mph especially at elevations above 2500 feet. This will lead to bitter wind chills in the mid to upper 20s east of the Blue Ridge and values in the single digits to a few degrees below zero over the mountains.

Dry conditions are expected for most locations outside the mountains and right along the PA/MD line where upslope snow showers/flurries will pass through. Have kept a mention of flurries in the forecast along and north of a line that extends from Petersburg, WV to Leesburg, VA and Baltimore, MD this morning into the afternoon.
Flurries have been noted per radar as of earlier this morning and MDSHA cameras near the Catoctin Mountains and along the PA/MD line between Carroll/Baltimore counties. 00z/06z hi-res CAM soundings continue to indicate just enough moisture underneath the inversion and CAPE in the DGZ for flurries this morning and into the afternoon. Little to no accumulation is expected in these areas outside of a trace to light dusting over Parrs Ridge/Catoctins where a light snow shower could pass through.

Much more favorable dynamics remain along and west of Allegheny Front. Upwards of a quarter inch of snow has been observed up around Friendsville, MD per the latest spotter report. Several cameras along I-68 from the WV line east toward Big Savage Mountain/Frostburg, MD have also shown light accumulation on the roadway. Expect this trend to continue through the morning and into the afternoon as additional upslope snow shower activity pumps through. The snow squall parameter also lights up between 0.5 to 2 later this afternoon and evening with some subtle CAPE leftover in the DGZ. This could provide a subtle enhancement in accumulation in favorable western slope locations (i.e Finzel, MD, Keysers Ridge, Bayard, WV). Snow accumulations will range between 1 to 2 inches along the western slopes with localized pockets of 3 inches or more at elevations above 3000 feet. FROUDE numbers will also increase this afternoon leading to the flurries leaking east and perhaps a few snow showers sneaking as far as the Catoctin Mountains.

Very cold air arrives tonight with most locations seeing lows in the teens and low 20s. Mountain locations above 2500 feet will see lows in the single digits. Winds will gradually decrease overnight, but remain elevated leading to wind chills in the single digits and low teens. Be sure to bundle up and protect yourself, pets, plants, and pipes from the cold!

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/
Temperatures will begin to moderate midweek as southern stream energy over the southwest U.S begins to strengthen and northern stream energy over central Canada digs southward toward the region.
At the surface, sits an area of broad high pressure that will build overhead Wednesday before shifting offshore Thursday. Winds will switch from the northwest to southwest allowing temperatures to quickly recover. Highs Wednesday will push back in the 40s in most locations after a bitterly cold start in the teens and 20s. These values continue to climb into the 50s Thursday as southwesterly flow increases with high pressure offshore.

Dry conditions will prevail on both days with mostly sunny skies Wednesday and increasing cloud cover Thursday into Thursday night as a front and area of low pressure approach from the lower Mississippi River/Ohio River Valleys. Any precipitation chances should hold off until late Thursday night or Friday morning, starting west of the Allegheny Front then pushing eastward for the late week period. Will have to monitor the onset of the precipitation in the mountains where a brief period of snow/sleet could occur with temperatures right around freezing Thursday night into Friday morning.

LONG TERM /FRIDAY THROUGH MONDAY/
Flat ridging Fri into the weekend will be replaced by troughiness early next week leading to another cool down. A pair of shortwave troughs are forecast to move across the region over the next seven days, one Fri afternoon and a second one Monday. The first one is expected to bring widespread light rain Fri and the second stronger one is expected to induce strong sfc cyclogenesis Monday and may be accompanied by quite a bit of wind in addition to some rain.



AVIATION /09Z TUESDAY THROUGH SATURDAY/
Wind will be the big concern for aviation once again today as a sharp mid/upper level trough crosses the region. The strongest winds look to occur between 15-21z/10am-4pm today. Northwest gusts of 30 to 35 kts are expected at most terminals along and north of I-66/US- 50. Gusts between 20 to 25 kts are likely further south toward KCHO/KSHD/KLYH. Winds will gradually decrease later this afternoon and evening, but will remain elevated out of the west and northwest overnight. Winds will switch to the southwest Wednesday as high pressure builds overhead. Gusts will remain between 15 to 20kts with a focus on the ridges/areas around the waters late Wednesday morning into Wednesday afternoon.

SCT-BKN low end VFR to high end MVFR cigs will remain possible at terminals north of I-66/US-50 and west of KDCA and KBWI later this morning and into the afternoon. This is due in part to upslope cloud cover from snow shower activity spilling eastward over the mountains. Cigs will bounce between 3-6kft through mid afternoon before improving this evening as drier air pushes in.
Some snow flurries are possible from KBWI northward and west of KFDK/KHGR/KMRB later this morning and into the afternoon. No accumulation is expected.

High pressure brings VFR conditions to the area Wednesday and Thursday. MVFR conditions Friday and Friday night with light rain across the area. Winds around 10 knots Thursday and Thursday night.
Winds increasing south 10 to 15 knots with gusts up to 20 knots Friday and Friday night.

Widespread light rain is expected Fri which may cause brief flight restrictions.

MARINE

Hazardous marine conditions are expected to persist through tonight.
Gale Warnings are in effect later this morning and into the late afternoon for Chesapeake Bay and lower tidal Potomac. The strongest winds are expected later this morning and into the mid-afternoon period between 16-21z/11am-4pm. Gusts up to 35 kts are possible at this time. Outside of the Gale Warning, Small Craft Advisories remain in effect for all waters through Wednesday morning for gusts up to 30kts.

Conditions gradually improve Wednesday as high pressure builds over the region. However, additional Small Craft Advisories are likely to be needed Wednesday afternoon and evening due to southerly channeling.

No marine hazards Thursday and Thursday night. Winds remain out of the south to southwest at 10 knots Thursday and Thursday night.
Small craft advisories will be possible Friday and Friday night with southwest winds at 10 to 20 knots.

Sub SCA Level winds are expected Saturday with brief high pressure. SCA conditions are possible Sunday.



TIDES/COASTAL FLOODING
Anomalies will continue to tank as a result of strong offshore flow through tonight. Tidal blowout conditions are possible, but confidence is low since the period for strong offshore flow is relatively limited. Anomalies will gradually climb midweek as the flow turns back to the south and southwest.

CLIMATE
The coldest air of the season is set to arrive Tuesday into Tuesday night, with near-record lows possible at IAD and MRB on Wednesday morning (November 29).

Below is a list of daily record lows for November 28-29

Climate Site Nov 28 Nov 29 Washington-National (DCA) 15F (1930) 14F (1930)
Washington-Dulles (IAD) 19F (1996) 17F (1967)
Baltimore (BWI) 15F (1951) 13F (1955)
Martinsburg (MRB) 12F (1938) 6F (1930)
Annapolis (NAK)* 17F (1930) 13F (1930)
Hagerstown (HGR)* 7F (1938) 1F (1930)
Charlottesville (CHO)* 13F (1930) 12F (1930)

LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 6 AM EST early this morning for ANZ530>534-537>543.
Small Craft Advisory from 6 PM this evening to 7 AM EST Wednesday for ANZ530>534-537>543.
Gale Warning until 6 PM EST this evening for ANZ530>534- 537>543.
Small Craft Advisory until 7 AM EST Wednesday for ANZ535-536.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
WASD2 - 8594900 - Washington, DC 19 mi55 min WSW 6G8.9 37°F 48°F29.93
BLTM2 - 8574680 - Baltimore, MD 24 mi55 min W 1.9G5.1 53°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 25 mi55 min WSW 8.9G11 37°F
FSNM2 26 mi55 min WSW 11G17 29.90
APAM2 - 8575512 - Annapolis, MD 30 mi55 min WSW 2.9G7 35°F 55°F29.92
BSLM2 - Chesapeake Bay, MD 30 mi103 min SSW 2.9 33°F 29.9222°F
44043 - Patapsco, MD 32 mi49 min WSW 12G14 37°F 50°F1 ft
44063 - Annapolis 32 mi49 min W 12G18 35°F 50°F1 ft
CPVM2 34 mi55 min 38°F 27°F
TPLM2 - Thomas Point, MD 35 mi73 min SSW 15G17 36°F 29.95
TCBM2 - 8573364 - Tolchester Beach, MD 40 mi61 min W 16G21 39°F 29.91

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Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KGAI MONTGOMERY COUNTY AIRPARK,MD 9 sm16 minWNW 0910 smOvercast34°F21°F60%29.92
KCGS COLLEGE PARK,MD 12 sm22 minSSW 0410 smOvercast37°F19°F48%29.95
KFME TIPTON,MD 13 sm23 minWSW 0610 smOvercast32°F27°F80%29.95
KBWI BALTIMORE/WASHINGTON INTL THURGOOD MARSHALL,MD 18 sm18 minWSW 0710 smOvercast37°F21°F52%29.92
KDCA RONALD REAGAN WASHINGTON NATIONAL,VA 21 sm20 minW 1010 smMostly Cloudy37°F19°F48%29.95
KADW JOINT BASE ANDREWS,MD 24 sm17 minSW 0710 smOvercast36°F21°F55%29.91

Wind History from GAI
(wind in knots)


Tide / Current for Chain Bridge, D.C.
   
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Chain Bridge
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Tue -- 03:33 AM EST     -0.28 feet Low Tide
Tue -- 07:04 AM EST     Sunrise
Tue -- 08:35 AM EST     Moonset
Tue -- 09:00 AM EST     2.75 feet High Tide
Tue -- 03:23 PM EST     -0.13 feet Low Tide
Tue -- 04:47 PM EST     Sunset
Tue -- 05:37 PM EST     Moonrise
Tue -- 09:12 PM EST     3.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Chain Bridge, D.C., Tide feet
12
am
1.5
1
am
0.8
2
am
0.3
3
am
-0.2
4
am
-0.2
5
am
0.3
6
am
1.1
7
am
2
8
am
2.5
9
am
2.7
10
am
2.5
11
am
1.9
12
pm
1.2
1
pm
0.6
2
pm
0.2
3
pm
-0.1
4
pm
-0.1
5
pm
0.5
6
pm
1.4
7
pm
2.3
8
pm
3
9
pm
3.3
10
pm
3.1
11
pm
2.6



Tide / Current for Benning Bridge, D.C.
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Benning Bridge
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Tue -- 03:27 AM EST     -0.30 feet Low Tide
Tue -- 07:04 AM EST     Sunrise
Tue -- 08:34 AM EST     Moonset
Tue -- 08:56 AM EST     2.85 feet High Tide
Tue -- 03:17 PM EST     -0.14 feet Low Tide
Tue -- 04:47 PM EST     Sunset
Tue -- 05:37 PM EST     Moonrise
Tue -- 09:08 PM EST     3.39 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Benning Bridge, D.C., Tide feet
12
am
1.5
1
am
0.8
2
am
0.2
3
am
-0.2
4
am
-0.2
5
am
0.4
6
am
1.3
7
am
2.1
8
am
2.7
9
am
2.9
10
am
2.6
11
am
1.9
12
pm
1.2
1
pm
0.6
2
pm
0.2
3
pm
-0.1
4
pm
-0
5
pm
0.6
6
pm
1.5
7
pm
2.5
8
pm
3.1
9
pm
3.4
10
pm
3.2
11
pm
2.6




Weather Map
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