590wx - Chesapeake Bay marine weather

590wx

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590wx.com is a private, non-commercial site for general informational and educational use. It is not a government site, is not affiliated with or endorsed by NOAA, the National Weather Service, the U.S. Coast Guard, the U.S. Army Corps of Engineers, or any other federal, state, or local agency, and nothing on this site should be interpreted as an official forecast, warning, advisory, or navigational product.

LIVE WIND STATIONS - NOAA PORTS

Winds

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72-HOUR FORECAST MAPS - NWS WAKEFIELD - VA WATERS

Forecast maps

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Issued ~4×/day by NWS Wakefield (AKQ). Covers Smith Point south to Cape Henry plus VA rivers. Tap any map to enlarge.

NWS NEXRAD reflectivity loops

Radar

KLWX - Sterling, VA (Upper Bay)open NWS

KAKQ - Wakefield, VA (Lower Bay)open NWS

National Weather Service warning and advisory thresholds — marine

Criteria

Calmbelow 18 knots

Small Craft18 to 33 knots

Gale34 to 47 knots

Storm48 to 63 knots

Hurricane Force64 to 99 knots

Major Hurricane100 knots and above

Watch

Conditions are favorable. Prepare for warnings to be issued.

Warning

Event is imminent, occurring, or has a high likelihood of occurrence. Take action to protect life and property.

Marine wind and wave

Headline

Chesapeake Bay

Coastal Waters

Small Craft Advisory

18 to 33 knots / waves 4 feet or greater

25 to 33 knots / seas 5 feet or greater

Gale Warning

34 to 47 knots

Storm Warning

48 knots or greater

Hurricane Force Wind Warning

64 knots or greater

Special Marine Warning

Thunderstorm winds 34 knots or greater, hail three quarters of an inch or larger, or waterspouts

Small Craft Advisory threshold uses the top of the forecast wind and seas range. For Currituck Sound and the Virginia rivers, Small Craft Advisory is issued at 18 to 33 knots with no seas criterion.

High surf — coastal waters only

High Surf Advisorysurf 8 feet near shore

High Surf Advisory10 feet at 10 second period

High Surf Advisory12 feet at 10 second period, longer than 12 hours

Not applicable to Chesapeake Bay zones.

Wind

Wind Advisory31 to 39 miles per hour, sustained 1 hour or more

High Wind Warning40 miles per hour or greater, sustained 1 hour or more

High Wind Warning58 miles per hour or greater, any duration

Convective hazards

Severe Thunderstorm Warninghail 1 inch or larger, or wind 58 miles per hour or greater

Tornado Warningtornado detected by radar, funnel cloud or tornado spotted, or waterspout moving onshore

Quarter-size hail equals 1 inch in diameter. Waterspouts moving onshore trigger a Tornado Warning, not a Special Marine Warning.

Visibility

Dense Fog Advisoryvisibility one quarter mile or less

Cold exposure

Wind Chill AdvisoryWind Chill Index 0 degrees Fahrenheit or below

Wind Chill WarningWind Chill Index minus 15 degrees Fahrenheit or below

Winter precipitation

Product

Maryland and interior Virginia

Ice and sleet (all areas)

Winter Weather Advisory

snow 1 to 2 inches average

sleet one quarter to 1 inch, or any ice accretion on sidewalks and roadways

Winter Storm Warning

snow 5 inches or greater in 24 hours, or 4 inches or greater in 12 hours

sleet 1 inch or greater, or ice accretion one quarter inch or greater

Blizzard Warning

Sustained wind or frequent gusts 35 miles per hour or greater, with considerable blowing or drifting snow reducing visibility frequently below one quarter mile for more than 3 hours

Use average or midpoint of the forecast range, round up. Example: a 3 to 5 inch snow forecast meets warning criteria. North Carolina and southeast Virginia snow warning threshold is 4 inches in 24 hours or 3 inches in 12 hours.

Source: National Weather Service, Wakefield, Virginia office — Warning and Advisory Criteria. Marine wind and wave thresholds verified identical at the Sterling, Virginia office via the Sterling Watch, Warning and Advisory Definitions page. Atlantic marine zones 530 through 658.

WIND & GUST - 16 ZONES - 2 DAYS

Chesapeake Bay zone forecast

Zones under warning

Storm warn or higher

Peak gust (48h)

Min sustained

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F0F1F2 F3F4F5 F6F7F8 F9F10F11 C1C2C3+

BRIDGE CLEARANCE SENSORS - NOAA PORTS - LIVE

Air gaps

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TIDAL CURRENT PREDICTIONS

Currents

Coming soon. Tidal current speed and direction from NOAA CO-OPS stations along the Bay corridor, with max flood, max ebb, and slack times.

TIDE PREDICTIONS & OBSERVED LEVELS

Tides

Coming soon. Predicted high and low tides plus observed water levels from Baltimore Harbor, Annapolis, Cambridge, Solomons, and Cape Henry PORTS stations.

PORTS OBSERVATION POINTS

Points

Coming soon. Real-time observed wind, air temperature, water temperature, visibility, and salinity from NOAA PORTS stations throughout the Chesapeake Bay system.

MARINE WATCHES & WARNINGS

Alerts

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Source: NWS tgftp marine zone text - api.weather.gov alerts - NOAA CO-OPS PORTS Auto-refresh every 30 min - Status - About

About this site

590wx.com is a private, non-commercial site for general informational and educational use. It is not a government site, is not affiliated with or endorsed by NOAA, the National Weather Service, the U.S. Coast Guard, the U.S. Army Corps of Engineers, or any other federal, state, or local agency.

Nothing on this site should be interpreted as an official forecast, warning, advisory, or navigational product. All content is aggregated from public data sources and may be delayed, incomplete, inaccurate, or incorrectly parsed. Data feeds may be interrupted without notice.

Do not use 590wx.com for operational decision-making of any kind. Do not use it to plan navigation, make go/no-go calls, schedule movements, evaluate weather windows, or substitute for any official briefing or product.

For authoritative marine weather, forecasts, warnings, and navigational information, consult weather.gov/marine, tidesandcurrents.noaa.gov, nauticalcharts.noaa.gov, and current U.S. Coast Guard Local Notices to Mariners. Cross-reference multiple official sources before acting on any weather, tide, current, or bathymetry information.

The site is provided "as is" with no warranty of any kind, express or implied, including fitness for a particular purpose, accuracy, reliability, or availability. All trademarks, product names, and agency names mentioned are the property of their respective owners and appear here for identification only.

Watch official sources. Make your own decisions.

590wx - Chesapeake Bay marine weather intelligence