For experts who make a living forecasting hurricanes, storm season is a year-round worry. When the tropics are calm, as they are now, researchers dive into data, analyze results, improve scientific models and train state and local officials on the latest technology that can help them make lifesaving decisions.

But the partial government shutdown — the longest in United States history — has brought much of that fieldwork and instruction to a halt. Most researchers have been furloughed, and training academies and courses have been canceled, with no makeup dates in sight.