21 Weather Forecast

[Maral Mende]

Scatteredsevere thunderstorms are expected across portions of the central/northern Plains Sunday while heavy to excessive rainfall may bring flooding to northern Minnesota and the Tennessee Valley. Dry and windy conditions will bring elevated to critical fire weather across parts of the Great Basin while dry thunderstorms may lead to new wildfire starts in the northern Rockies. Read More >

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National Weather Service

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Silver Spring, MD 20910

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With nearly 4,900 employees in 122 weather forecast offices, 13 river forecast centers, 9 national centers, and other support offices around the country, NWS provides a national infrastructure to gather and process data worldwide.

A mere 6 inches of fast-moving flood water can knock over an adult. It takes just 12 inches of rushing water to carry away a small car, while 2 feet of rushing water can carry away most vehicles. It is NEVER safe to drive or walk into flood waters.

Displays flood and flash flood reports as well as intense rainfall observations for user-selectable time ranges and customizable geographic regions. Includes ability to download reports and associated metadata in csv format. GEFS Probabilities Plots of GEFS probabilistic forecast of precipitation, temperature, and sea-level pressure exceeding various thresholds.

Displays the climatological significance of precipitation forecast by WPC. The climatological significance is represented by Average Recurrence Intervals (ARIs) of precipitation estimates from NOAA Atlas-14 and Atlas2.

An interactive situational awareness table that displays anomalies, percentiles, and return intervals from the GEFS, NAEFS, and ECMWF Ensembles (login required to view ECMWF data). *Please note that there is currently an issue where only users on a NOAA network can access this page. We are actively working to resolve this problem.

Displays Days 1-7 NDFD maximum and minimum temperatures, along with their respective departures from climatology. Prototype Snowband Probability Forecasts An interactive tool that depicts areas of heavy snowfall from individual members of high-resolution short range ensemble forecasts. Weather in Context Prototype Displays forecast information and its climatological context to quickly alert a forecaster when a record or neear-record breaking event is possible. This tool is available for both CONUS and Alaska. Prototype Specialized Excessive Rainfall Maps Interface for specialized WPC Excessive Rainfall Outlook Maps for NWS County Warning Areas and States. 1/3/6/24-hr Changes Change in weather parameters (temperature, dewpoint, surface pressure, etc) over the last 1/3/6/24 hours. Data is provided from the Real-Time Mesoscale Analysis (RTMA) or the Rapid Refresh (RAP).

The experimental National Weather Service (NWS) HeatRisk is a color-numeric-based index that provides a forecast of the potential level of risk for heat-related impacts to occur over a 24-hour period, with forecasts available out through 7 days.

We are now leveraging our big data smarts to deliver on the promise of IoT. By integrating our hyper-local weather data with Smart Home connected devices we are delievering predictive energy efficiency insight to homeowners and Utility companies.

Mountain weather is subject to rapid changes and extreme conditions. This forecast is just one tool to help you plan a safe trip (if in doubt, turn around!). Always travel with adequate clothing, shelter, food, and water, and be prepared to make your own assessment of travel and weather conditions. You should never visit the higher summits unprepared.

Medical and security emergencies can happen in the backcountry. Our Higher Summits Forecast sponsor Global Rescue can provide medical, security, travel risk, and crisis response services. For your next backcountry adventure, consider ensuring your safety by becoming a member with Global Rescue ahead of time.

If you frequently utilize this forecast, please consider becoming a supporting member of Mount Washington Observatory. As a private, nonprofit institution, membership is an important source of funding that directly supports the unique work we do at the summit of Mount Washington.

This page doesn\'t support iframes. You can view the page in a separate window instead.'); document.writeln(''); /* ]]> */ Copyright 2006-2024 PassageWeather.com Privacy Policy Disclaimer System Status Website designed and managed by BR Webworks PassageWeather.com specialises in Sailing Weather Forecasts... We provide 7-day Wind and Wave Forecasts to help sailors with their passage planning and weather routing. Before and during deliveries, ocean races, regattas, cruises, and all other types of offshore passages, we have your whole route covered.

Our sailing weather forecasts are derived using data from the most trusted and reliable weather models available. These models include the GFS and WaveWatch III models, the same weather models that produce the GRIB files used by modern electronic navigation software and weather routing software.

Near the Leeward Islands and Greater Antilles: An area of disturbed weather over the central tropical Atlantic Ocean is expected to interact with an approaching tropical wave during the next several days. Environmental conditions are forecast to become conducive for some development in a day or two, and a tropical depression could form around midweek while the system is near or over the northern Leeward Islands, Greater Antilles, or southwestern Atlantic Ocean. * Formation chance through 48 hours, low, near 0 percent. * Formation chance through 7 days, medium, 40 percent.

The monsoon trough enters the Atlantic through the coast of Mauritania near 19N16W and continues southwestward to 11N37W and to 10N50W. The ITCZ extends from 10N50W to 09N60W. Scattered moderate to isolated strong convection is present from 15N to 20N.

High pressure over New England extends southward into the Gulf the Mexico. This pattern is supporting gentle to moderate E to SE winds over the basin, except for moderate to fresh E winds across the Bay of Campeche. Seas are 1 to 3 ft in the eastern Gulf, and 2 to 4 ft elsewhere. A few showers and thunderstorms are active along the coast of Veracruz, Mexico, and over the central Texas coast.

For the forecast, a ridge will remain in place across the Gulf waters through Thu allowing for gentle to moderate winds and slight to moderate seas. Fresh winds are expected near and to the NW of the Yucatan Peninsula at night during the forecast period due to local effects.

Divergence aloft and plenty of tropical moisture continue to support scattered showers and isolated thunderstorms off Cabo Gracias a Dios in eastern Honduras and northeast Nicaragua, and near the Nicaragua/Costa Rica border. The Caribbean Sea is under the influence of a broad subtropical ridge positioned over the central Atlantic, forcing fresh to strong easterly trade winds in the central, SW and NW Caribbean. Seas in these waters are 6-9 ft. An earlier scatterometer satellite pass captured the strongest winds off northern Colombia and the Gulf of Venezuela. Moderate or weaker winds and slight to moderate seas are found in the eastern Caribbean, south of 12N in the SW Caribbean, the Windward Passage and lee of Cuba.

For the forecast, the Atlantic ridge is building over the eastern and central Caribbean, supporting fresh to strong trade winds and rough seas across the central Caribbean into the middle of the week. Expect moderate to fresh E to SE winds and building seas over the northwest Caribbean today, with locally strong winds and rough seas across the Gulf of Honduras tonight. Looking ahead, winds and seas may increase northeast of the Leeward Islands Tue night into Wed ahead of an approaching tropical wave.

A stationary front off northeast Florida along 30N supports scattered showers and isolated thunderstorms north of 28N between 70W and 75W. Moderate to locally fresh S-SW winds are occurring north of 28N and between 65W and 77W to the south of the frontal boundary. Farther east, water vapor imagery depict an upper level low near 30N57W producing scattered showers from 28N to 30N between 55W and 58W. The rest of the basin is under a broad subtropical ridge positioned over the central Atlantic. Fresh to locally strong northerly winds are noted off Western Sahara and Morocco to 20W and north of 20N. The strongest winds are present in the water passages of the Canary Islands. Seas in these waters are 4-6 ft. Elsewhere, moderate or weaker winds and moderate seas are present.

For the forecast west of 55W, the stationary front off northeast Florida along 30N will gradually dissipate through Mon. The Bermuda-Azores high pressure will build across the region thereafter into mid-week, supporting gentle to moderate winds north of 22N, and moderate to fresh winds south of 22N. Looking ahead, winds and seas associated with a vigorous tropical wave may increase northeast of the Leeward Islands Tue night into Wed, then move to the north of Puerto Rico and Hispaniola through Thu.

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(ii) A forecast of thundery showers indicates an imminent risk of lightning. Lightning typically strikes within 6km radius of a location, but is known to strike more than 10km away from the thunderstorm cloud.

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