A moderately strong cold front moved across Northern California and brought seasonally heavy precipitation to the area.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS STO wrote it up.
A moderately strong cold front moved across Northern California and brought seasonally heavy precipitation to the area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sacramento, CA wrote its last area forecast discussion before the first event at Apr 21, 8:00 PM PST, 4 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SACRAMENTO CA 900 PM PDT SAT APR 21 2007 .DISCUSSION... COLD FRONT EXTENDS FROM THE NORTHERN SACRAMENTO VALLEY BACK OFF THE COAST. THE COLD FRONT WILL MOVE INTO SACRAMENTO LATER TONIGHT AND THEN THROUGH THE NORTHERN SAN JOAQUIN VALLEY BETWEEN 5 AND 7 AM. MOISTURE FIELDS KEEP A FAIR AMOUNT OF CLOUDS AROUND DURING THE DAY WHICH COULD INHIBIT CONVECTION. THE BEST CHANCES FOR THUNDERSTORMS WILL LIKELY BE OVER THE WESTERN HALF OF THE CENTRAL VALLEY IN THE AFTERNOON. CURRENTLY THE MODEL SOUNDING ARE MARGINAL BUT WE WILL HAVE TO KEEP AN EYE OUT ON HOW THE CLOUDS FAIR LATE SUNDAY MORNING INTO THE EARLY AFTERNOON HOURS. WE WOULD MOST LIKELY WOULD NEED TEMPERATURES WARMING INTO THE MID 60S FOR CONVECTION TO OCCUR. MODELS STILL INDICATING DECENT AMOUNTS OVER PRECIPITATION WITH THIS SYSTEM. HALF AND INCH TO AN INCH OF RAIN STILL LOOKS GOOD FOR THE CENTRAL VALLEY WITH SOME AMOUNTS ALONG THE EASTERN FOOTHILLS COULD GET CLOSE TO 1.5 INCHES OF RAINFALL. FOR THE MOUNTAINS GENERALLY 1 TO 2 INCHES OF RAINFALL LOOK POSSIBLE WITH THIS SYSTEM...AND A COUPLE OF FEET OF SNOW FOR THE HIGHER ELEVATIONS. CURRENTLY BLUE CANYON INDICATING SNOW...MOST LIKELY THE FIRST HOUR OF LEGITIMATE SNOW FROM THE OBSERVATION. RAIN/SNOW TRANSITION ALONG I-80 SEEMS TO BE AROUND BLUE CANYON AND WILL LIKELY REMAIN THERE UNTIL LATE TONIGHT AND SUNDAY MORNING WHEN IT SHOULD COME DOWN TO BETWEEN 5000 AND 4500 FEET EARLY SUNDAY MORNING. ABOUT 5 TO 7 INCHES OF SNOWFALL LOOK POSSIBLE FOR BLUE CANYON WITH THIS EVENT. THE THREAT OF SHOWERS OVER THE CENTRAL VALLEY COULD LINGER INTO THE EARLY EVENING ON SUNDAY BEFORE ENDING...PARTICULARLY FOR THE EASTERN SIDE OF THE VALLEY. NORTHWEST TO NORTH FLOW WILL DEVELOP ON MONDAY WITH SUNNY SKIES AND TEMPERATURES WARMING INTO THE MID 70S IN THE CENTRAL VALLEY. && .AVIATION... MTNS OBSCD IN PRECIPITATION OVERNIGHT WITH SOME IMPROVEMENT ALONG THE COASTAL RANGE DURING THE MORNING. THE SIERRA NEVADA WILL REMAIN OBSCD IN CLOUDS AND PRECIPITATION THROUGH SUNDAY MORNING. SNOW LEVELS GENERALLY 040-050 FT THIS EVENING. COLD FRONT OVER THE NORTHERN SACRAMENTO VALLEY COAST WILL MOVE SOUTH INTO SACRAMENTO AFT 09Z. MAINLY MVFR CIGS DEVELOPING AS COLD FRONT MOVES INTO THE INTERIOR LATE THIS EVENING OVER THE CENTRAL VALLEY AND BAY AREA WITH LCL IFR CONDITIONS POSSIBLE IN HEAVY RAIN OVERNIGHT. && .STO WATCHES/WARNINGS/ADVISORIES... WINTER STORM WARNING THROUGH 12 PM PDT SUNDAY FOR WESTERN PLUMAS COUNTY/LASSEN PARK. WINTER STORM WARNING THROUGH 3 PM PDT SUNDAY FOR WEST SLOPE NORTHERN SIERRA NEVADA. WINTER WEATHER ADVISORY THROUGH 6 AM PDT SUNDAY FOR MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO NORTHERN LAKE COUNTY-SHASTA LAKE AREA / NORTHERN SHASTA COUNTY. WINTER WEATHER ADVISORY THROUGH 12 PM PDT SUNDAY FOR BURNEY BASIN / EASTERN SHASTA COUNTY. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SACRAMENTO CA 700 AM PDT SAT APR 21 2007 CAZ013>019-063-064-066>069-221400- SHASTA LAKE AREA/NORTHERN SHASTA COUNTY- BURNEY BASIN/EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY- CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY- CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY- MOUNTAINS SOUTHWESTERN SHASTA TO NORTHERN LAKE COUNTIES- CLEAR LAKE/SOUTHERN LAKE COUNTY-MOTHERLODE- EAST FOOTHILLS/NORTH SACRAMENTO VALLEY- WESTERN PLUMAS COUNTY/LASSEN PARK-WEST SLOPE NORTHERN SIERRA NEVADA- 700 AM PDT SAT APR 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA. .DAY ONE...TODAY A WINTER-LIKE PACIFIC STORM WILL BRING RAIN...MOUNTAIN SNOW AND LOCALLY GUSTY WINDS TO THE INTERIOR OF NORTHERN CALIFORNIA TODAY AND SUNDAY. LIGHT PRECIPITATION IS EXPECTED TO BEGIN TODAY...WITH THE HEAVIEST PRECIPITATION EXPECTED TO FALL OVERNIGHT AND THROUGH SUNDAY MORNING. * WINTER STORM WARNING.......SEE WWUS46 KSTO - WSWSTO FOR DETAILS * * WINTER WEATHER ADVISORY....SEE WWUS46 KSTO - WSWSTO FOR DETAILS * .DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY RAIN AND MOUNTAIN SNOW WILL CONTINUE SUNDAY MORNING...AND THEN WILL DECREASE FROM WEST TO EAST DURING THE DAY AND EVENING. COLD AND BREEZY CONDITIONS ARE LIKELY OVER THE SIERRA NEVADA SUNDAY NIGHT AND MONDAY MORNING. WARMER WEATHER IS EXPECTED LATER IN THE WEEK. * WINTER STORM WARNING.......SEE WWUS46 KSTO - WSWSTO FOR DETAILS * * WINTER WEATHER ADVISORY....SEE WWUS46 KSTO - WSWSTO FOR DETAILS * .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS TO THEIR LOCAL NATIONAL WEATHER SERVICE OFFICE. THE LATEST WEATHER INFORMATION IS AVAILABLE ON THE INTERNET AT (LOWER CASE): HTTP://WWW.WRH.NOAA.GOV/STO
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
A daily maximum rainfall record of 0.33 inches was tied at Modesto. The record was initially set in 1961.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2007Every state in 2007This day in weather historyWarnings in California, April 2007
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 2026-09-24. Each event’s entry at NCEI: 17537.