The National Weather Service in Seattle issued a special marine warning October 31 for a thunderstorm capable of producing waterspouts off Washington’s coast.
The warning was issued at 7:57 a.m. Pacific Daylight Time and runs until 8:30 a.m. It covers coastal waters between Point Grenville and Cape Shoalwater, from 10 to 60 nautical miles offshore.
At the time of issuance, radar placed the storm about 35 nautical miles southwest of Point Grenville. It was moving north at 10 knots, according to the warning.
Forecasters said the storm was expected to remain mainly over open water. The notice identifies possible waterspouts as the hazard; it does not report a confirmed waterspout sighting.
The weather service warned that waterspouts can overturn boats and create dangerous local sea conditions. It asked that severe weather be reported to the Coast Guard or the National Weather Service.
This account describes the specific warning issued at 7:57 a.m.; its stated expiration is 8:30 a.m. October 31.