claude-opus-5-5 Analysis · Feb 21, 2026
Saturday, Feb 21 is dry and calm, with mostly sunny skies, highs near 47F, light winds of 1-6 mph and near-zero precipitation chances through midnight. A Winter Storm Warning for heavy snow begins at 4 AM Sunday, so conditions deteriorate after today.
- 01 Hourly precipitation chances are 0-3% from 6 AM to midnight, so roads should stay dry.
- 02 Temperatures run 34-47F, above freezing all day. Morning lows of 34-35F near 7 AM could allow isolated slick spots on shaded or untreated surfaces.
- 03 Winds are light at 1-6 mph, with no crosswind concerns today.
- 04 A Winter Storm Warning starts 4 AM Sunday: 8-16 inches of snow, gusts to 40 mph, rates over 2 inches per hour, and possible whiteouts. Travel could be very difficult to impossible.
- 05 Overnight into Sunday, temperatures fall to about 32F with a chance of rain, then rain and snow after 3 AM.
- 06 No visibility data was provided. The warning's 'to' time (Feb 22, 4 AM) conflicts with its headline (until Feb 23, 6 PM), which adds some uncertainty about timing.
Driving today is fine, and it is the best window to finish errands before the storm. Morning: drive between 9 AM and 12 PM, once temperatures are above 40F and any early frost has cleared. Evening: drive between 5 PM and 9 PM, while conditions are still dry and above freezing. Be at your destination by late evening and avoid travel after midnight, especially from 3 AM Sunday onward. Prepare now for Sunday and Monday: fuel up, pack an emergency kit (flashlight, food, water), and check 511 for road conditions.