Wednesday, January27, 2021
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Marine Weather and Tides
Havre de Grace, MD

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:15AMSunset 5:21PM Wednesday January 27, 2021 8:58 PM EST (01:58 UTC) Moonrise 4:08PMMoonset 6:39AM Illumination 100% Phase: Full Moon; Moon at 15 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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ANZ530 Chesapeake Bay North Of Pooles Island- 643 Pm Est Wed Jan 27 2021
.small craft advisory in effect from midnight tonight to 6 am est Thursday...
.gale warning in effect from 6 am est Thursday through Thursday afternoon...
.small craft advisory in effect from Thursday evening through late Thursday night...
Tonight..N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Thu..NW winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft.
Thu night..NW winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft.
Fri..NW winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft.
Fri night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
Sat night..NE winds around 5 kt. Waves 1 ft or less.
Sun..NE winds 5 to 10 kt. Waves 1 ft. Snow, then snow and rain after midnight.
Mon..N winds 10 to 15 kt. Waves 1 to 2 ft. Snow and rain .
ANZ500 643 Pm Est Wed Jan 27 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure may impact the waters tonight and Thursday. High pressure will return late in the week into the first part of the weekend. Another storm system may impact the region late in the weekend into early next week.


7 Day Forecast for Marine Location Near Havre de Grace, MD
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location: 39.54, -76.09     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 271918 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 218 PM EST Wed Jan 27 2021

SYNOPSIS. Low pressure will pass to the south tonight. High pressure will return late Thursday through Saturday before another area of low pressure affects the region Sunday into Monday.

NEAR TERM /THROUGH THURSDAY/. Clouds will increase again this evening ahead of low pressure approaching from the Tennessee River Valley. This area of low pressure will move off the South Carolina coast by Thursday morning. Although this surface low track is displaced well to our south, the parent upper-level trough forcing it will clip our area overnight into early Thursday morning. With cold temperatures through the atmosphere, precipitation will be mainly snow, and accumulating snow (albeit relatively light) is most likely along the Allegheny Front south of Canaan Valley, and across the foothills and surrounding valley/piedmont areas of west-central Virginia near and south of the I-64 corridor. A light coating of snow is possible during the Thursday morning commute for the far southern suburbs of Washington DC, which could cause slippery roads and sidewalks. A few flurries may make it as far north as US-50, as well as areas along and west of the Allegheny Front north of Canaan Valley, but accumulation is not anticipated for most of these areas, especially east of the mountains.

Some guidance has advisory-level snowfall (around 2 inches) along the Blue Ridge Mountains and atop Shenandoah Mountain, but the northwesterly flow (which is typically dry) plus the quick nature of the system have precluded the issuance of any Winter Weather Advisories for the time being.

Conditions will clear by mid morning Thursday, but it will be quite chilly despite the increased sunshine. Strong cold air advection will result in high temperatures generally in the 30s, and when coupled with wind gusts of 30 to 40 mph, wind chill temperatures likely hold in the 20s all day.

SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/. Thursday night through Friday night will likely be the coldest time period most of the area has seen in a couple years as Arctic high pressure builds toward the region. High temperatures in the 30s (teens on the mountains) coupled with a continued blustery northwesterly wind Friday is forecast to keep wind chill temperatures in the teens and 20s again. Overnight low temperatures are forecast to fall into the teens to lower 20s (single digits on the mountains) each night, with wind chill temperatures down into the single digits for most (single digits and teens below zero on the higher ridgetops).

LONG TERM /SATURDAY THROUGH WEDNESDAY/. High pressure initially located overhead will slowly start to slide offshore Saturday afternoon into Saturday evening. Dry conditions, a light wind, and chilly temperatures are expected for Saturday, with high temperatures in the 30s for most. The sky should start out mostly sunny, but high clouds will start to filter in later in the afternoon.

Beyond that, attention turns to a system currently located just off of the West Coast. This system will move onshore tomorrow, and track across the CONUS Friday into Saturday. By Saturday Night the system will move into the Ohio River Valley. As it does so, warm air advection precipitation downstream of the closed mid-level low/broader scale trough will start to overspread the area either late Saturday Night or early Sunday. Confidence is increasing that much, if not all of the forecast area will see at least some accumulating snow on Sunday in association with this round of warm air advection precipitation.

Confidence in the details of the forecast decreases thereafter. At mid-upper levels, the closed mid-level low is expected to very slowly progress toward the east Sunday Night through Monday as a downstream system over the Atlantic Ocean blocks its forward progress. Meanwhile, an additional disturbance descending down from the Upper Great Lakes in northwesterly flow will act to reinforce the backside of the trough as the first piece slowly progresses to the east. As the first piece progresses eastward, the primary surface low over the Ohio River Valley should eventually transfer to a developing coastal low off the Eastern Seaboard. Additional snow may be possible with this coastal low, but a lot of uncertainty remains with respect to the eventual strength and placement of this low pressure and its associated precipitation shield. Either way, at least some (snow) shower activity will remain possible on Monday, but the potential is also there for a more substantial snowfall with this round (as shown in the deterministic 12z Euro). Ensembles continue to signal significant spread during this time period, which illustrates the high level of uncertainty in the forecast for Sunday Night through Monday. Depending on how the downstream block evolves, snow showers may even linger into the day on Tuesday. We'll continue to assess trends and adjust our forecast as confidence gradually increases moving closer to the event.

AVIATION /19Z WEDNESDAY THROUGH MONDAY/. Generally VFR conditions are forecast through Friday night, though a few snow showers are possible 4z-9z near KCHO tonight, with MVFR or brief IFR possible. A few flurries can't be ruled out as far north as KIAD/KDCA, but restrictions are not expected. Northwesterly flow is expected through the period with gusts in excess of 35 kt possible Thursday and again Friday.

VFR conditions and a light wind are expected during the day on Saturday. Conditions will likely deteriorate to sub-VFR later Saturday night into Sunday as snow moves into the area. The wind is expected to turn easterly/northeasterly on Sunday.

MARINE. Northwesterly wind gusts will likely abate briefly this evening before increasing again overnight. The wind will increase further Thursday into Friday as strong low pressure develops offshore, with gale force wind gusts likely. The Gale Warnings/Small Craft Advisories (SCAs) may need to be expanded, or extended into Friday.

Sub-SCA level wind is expected on Saturday with high pressure over the area. The wind will turn easterly/northeasterly on Sunday, then northerly Sunday Night as low pressure develops off the coast. Some of these gusts may potentially approach SCA levels.

TIDES/COASTAL FLOODING. A strong northwesterly wind may result in blowout tides Thursday into Friday.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 AM EST Thursday for ANZ531>534- 537-539>543. Small Craft Advisory from 6 PM Thursday to 6 AM EST Friday for ANZ530-531-535-536-538-539-542. Gale Warning from 6 AM to 6 PM EST Thursday for ANZ530-531-535- 536-538-539-542. Small Craft Advisory until 6 PM EST this evening for ANZ530- 535-536-538. Small Craft Advisory from midnight tonight to 6 AM EST Thursday for ANZ530-535-536-538. Gale Warning from 6 AM Thursday to 6 AM EST Friday for ANZ532>534-537-540-541-543.

SYNOPSIS . DHOF NEAR TERM . DHOF SHORT TERM . DHOF LONG TERM . KJP AVIATION . DHOF/KJP MARINE . DHOF/KJP TIDES/COASTAL FLOODING . DHOF


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DRSD1 - Delaware Reserve, DE 47 mi88 min NW 1 33°F 1021 hPa29°F
TPLM2 - Thomas Point, MD 48 mi58 min N 12 G 13 38°F 39°F1020.6 hPa (+0.9)26°F

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Baltimore / Martin, MD22 mi63 minN 410.00 miOvercast36°F27°F70%1020.7 hPa

Link to 5 minute data for KAPG

Wind History from APG (wind in knots)
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Last 24hrCalmCalmCalmCalmS4CalmCalmCalmE4NE3NE3--NE3CalmSW3CalmCalm--NE5NE6NE4NE6E6NE4
1 day agoN3--CalmCalmCalmCalmCalmCalmCalm--Calm--CalmCalmCalmNE3E4E3--NE4CalmCalmCalmCalm
2 days ago------------------------------------------NW6----

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland (2)
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Havre de Grace
Click for Map
Wed -- 04:04 AM EST     -0.03 feet Low Tide
Wed -- 06:39 AM EST     Moonset
Wed -- 07:15 AM EST     Sunrise
Wed -- 08:22 AM EST     0.82 feet High Tide
Wed -- 02:40 PM EST     -0.57 feet Low Tide
Wed -- 04:08 PM EST     Moonrise
Wed -- 05:18 PM EST     Sunset
Wed -- 09:15 PM EST     1.87 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.70.30.1-00.10.30.60.80.80.60.3-0-0.3-0.5-0.6-0.40.10.71.21.71.91.81.6

Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
Click for Map
Wed -- 01:54 AM EST     0.01 knots Slack
Wed -- 05:37 AM EST     1.85 knots Max Flood
Wed -- 06:38 AM EST     Moonset
Wed -- 07:14 AM EST     Sunrise
Wed -- 07:54 AM EST     -0.02 knots Slack
Wed -- 11:37 AM EST     -2.30 knots Max Ebb
Wed -- 03:29 PM EST     0.01 knots Slack
Wed -- 04:06 PM EST     Moonrise
Wed -- 05:17 PM EST     Sunset
Wed -- 06:31 PM EST     2.20 knots Max Flood
Wed -- 10:01 PM EST     -0.08 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.3-0.90.311.41.81.81.4-0.5-1.5-2-2.3-2.3-2-1.6-0.911.82.12.21.81.30.2-1.1

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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