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The weather service put out a special marine warning Wednesday morning of high waves and possible waterspouts. The warning was in effect until 12:15, though thunderstorms over the southern half of ...
A lake wind advisory is issued for winds just below this range, because unobstructed winds across the open waters of a lake are normally faster than across land. The wind speed that triggers the advisory has changed over time. Until the late 1960s, the threshold was 32 to 38 miles per hour (or 28 to 33 knots). At some point, the lower limit was ...
Between August 1989 and 1995, the unit named the Marine Forecast Branch also was involved in providing objective analysis and forecast products for marine and oceanographic variables. [10] [11] When the National Centers for Environmental Prediction was created, the Marine Prediction Center (MPC) was organized to assume the U.S. obligation to ...
Small craft advisories are in effect from Saginaw Bay to Port Huron from 5 a.m. to 10 p.m. Tuesday and for Lake St. Clair and the Michigan waters of Lake Erie from 8 a.m. to 4 p.m. Tuesday, per ...
The National Weather Service issues a similar high wind warning (Specific Area Message Encoding code: HWW) for high winds on land. The criteria vary from place to place; however, in most cases, the warning applies to winds of 40 miles per hour (64 km/h) to 73 miles per hour (117 km/h) for at least 1 hour; or any gusts of 58 miles per hour (93 km/h) to 114 miles per hour (183 km/h) on land.
Detail of NOAA Chart #14909 Closer detail of NOAA Chart. Porte des Morts, also known as Porte des Mortes, the Door of Death, and Death's Door is a strait linking Lake Michigan and Green Bay between the northern tip of the Door Peninsula and the southernmost of the Potawatomi Islands.
Dense fog advisory NPW – Widespread or localized fog reducing visibilities of 1 ⁄ 8 to 1 ⁄ 4 mi (0.2 to 0.4 km) or less (up to 1 nmi [1.2 mi; 1.9 km] for marine-based advisories, depending on locally defined criteria) is occurring or is forecast within the next six to 12 hours. [32] [52]
A special marine warning (SAME code SMW) is a warning issued by the U.S. National Weather Service for potentially hazardous marine weather conditions usually of short duration (up to 2 hours) producing sustained marine thunderstorm winds or associated gusts of 34 knots or greater; or hail 3/4 inch or more in diameter; or waterspouts affecting areas included in a coastal waters forecast, a ...