The vocabulary did not change. The timer did.
A tropical storm watch usually means those conditions are possible within 48 hours. That is the card we handed you Saturday. A warning means expected within 36 hours. Kauai and Niihau already have the higher product: a hurricane warning, which is the same 36-hour idea at 74 mph and up.
This morning’s Oahu watch is the exception in the fine print. NHC wrote it down: tropical storm conditions are possible within 12–24 hours, “in this case.” They also wrote the sequel: any additional eastward shift would require a tropical storm warning for Oahu.
Why the short fuse? Lowell is closer (375 miles from Lihue at 5 a.m.) and faster (14 mph). Hurricane-force winds still reach 60 miles from the center. Tropical-storm-force winds 175. You do not need the eye over Waikiki to get 40-mph rainbands and a flood watch. Kauai’s rain isolated number went to 16 inches. Surge there 2–4 feet.
Saffir-Simpson is still only wind. Category 3 is 111–129 mph. Lowell is 115. Weakening is forecast. A hurricane at closest approach is still the forecast. Track is the driveway. Watch on Oahu is the porch light.
What this means for you
If you are on Kauai, you are past the lesson. Stay inside. If you are on Oahu, do not wait for a warning to take the plants off the lanai. If you are reading this from the mainland, “watch” today is not the relaxed cousin of yesterday’s watch.
Bottom line: 48 hours is the textbook. 12–24 is this advisory. Oahu is on the short clock.
GLHR NEWS explains the news. Not investment, tax, or trading advice. Do your own work before you act.
