A Winter Storm Warning was issued for California zone CAZ082 above 4500 feet at 1506 PDT on 04/27. The elevation of the warning was raised to 5000 feet at 2140 PDT on 04/27, and the warning expired at 1023 PDT on 04/28.
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The episode as NWS MFR wrote it up.
A Winter Storm Warning was issued for California zone CAZ082 above 4500 feet at 1506 PDT on 04/27. The elevation of the warning was raised to 5000 feet at 2140 PDT on 04/27, and the warning expired at 1023 PDT on 04/28. Nearly all the spotters and observation platforms are below the warning elevation, so no verifying reports were recieved from those sources. However, Sand Flat at 6750 feet recorded 9 inches of snow in 7 hours between 2100 UTC on 04/27 and 0400 UTC on 04/28, so it is likely that this warning verified. In addition, Mount Shasta City, below the warning level, recieved a 1.10 inches of rain in the 24 hours ending at 2000 PDT on 04/28. This would also support a warning at higher elevations.
The national radar mosaic for the moment the first event began.
1 heavy snow. Local standard time, as filed.
See below.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2003Every state in 2003This day in weather historyWarnings in California, April 2003
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 5348508.