Heavy rain possible for the northern Rockies & Plains; severe storms for the Northern Plains
An unseasonably strong storm system in the northwest U.S. will bring showers and thunderstorms, with locally heavy rainfall, to the northern Rockies and northern Plains. Isolated flash floods will be possible in these areas. Some storms could become severe in parts of the Dakotas into Minnesota, with large hail and damaging winds. In addition, temperatures will be 10 to 20 degrees below average.
Hazardous Weather Conditions
25NM WSW Grand Haven MI
Marine Point Forecast [NOTICE]
High and low forecast temperature values represent air temperature.
Water temperature forecast is experimental.
Associated Zone Forecast which includes this point
Last Update: 12:02 pm CDT Aug 23, 2014
Forecast Valid: 1pm CDT Aug 23, 2014-6pm CDT Aug 29, 2014
WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES...ALONG WITH THE AVERAGE HEIGHT OF THE HIGHEST 10 PERCENT OF THE WAVES WHICH WILL OCCASIONALLY BE ENCOUNTERED.
- SynopsisBROAD LOW PRESSURE OF 29.9 INCHES IS SPREAD ACROSS THE
MID MISSISSIPPI RIVER VALLEY WITH BETTER ORGANIZED LOW PRESSURE OF
29.8 INCHES ACROSS THE CENTRAL PLAINS. THE PLAINS LOW PRESSURE WILL
DEEPEN TO AROUND 29.6 INCHES AS IT LIFTS NORTHWARD TOWARD THE
CANADIAN BORDER BY SUNDAY AFTERNOON...THEN TURN NORTHEAST ACROSS
NORTHERN ONTARIO. HIGH PRESSURE OF 30.2 INCHES WILL SPREAD SOUTHWARD
ACROSS NEW ENGLAND AND THE MID ATLANTIC STATES INTO SUNDAY NIGHT.
THE MAIN TRACK OF LOW PRESSURE SYSTEMS WILL REMAIN TO THE NORTHWEST
OF LAKE MICHIGAN EARLY NEXT WEEK BUT IS EXPECTED TO SHIFT ACROSS THE
LAKE DURING THE MIDDLE OF NEXT WEEK.
- This Afternoon Variable winds 5 kt or less. A chance of showers and thunderstorms, mainly before 3pm. Patchy fog. Waves 1 ft or less.
- Tonight NE wind 5 to 10 kt becoming ESE after midnight. Winds could gust as high as 15 kt. Patchy fog. Waves 1 ft or less.
- Sunday SE wind around 10 kt. Partly sunny. Waves 1 ft or less.
- Sunday Night SE wind 5 to 10 kt. Partly cloudy. Waves 1 ft or less.
- Monday SSW wind around 10 kt. A chance of showers and thunderstorms after 1pm. Waves around 1 ft.
- Monday Night SSW wind 5 to 10 kt. A slight chance of showers and thunderstorms. Waves 1 ft or less.
- Tuesday SSW wind around 10 kt. A chance of showers and thunderstorms. Waves 1 ft or less.
- Tuesday Night S wind around 10 kt. A chance of showers and thunderstorms. Waves 1 ft or less.
- Wednesday S wind around 10 kt. A chance of showers and thunderstorms. Waves 1 to 2 ft.
This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area.
Forecast information for a larger area can be found within the zone
forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc.
These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.
HOURLY WEATHER GRAPH
NATIONAL DIGITAL FORECAST DATABASE