Tropical moisture pushed northward and coupled with a Gulf of Alaska low to produce thunderstorms in the northern Sierra/southern Cascades. Some thunderstorms had locally heavy rain.
Every event with a place to put it. Tap one for its entry below.
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.
Tropical moisture pushed northward and coupled with a Gulf of Alaska low to produce thunderstorms in the northern Sierra/southern Cascades. Some thunderstorms had locally heavy rain.
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 Jul 30, 1:35 PM PST, 1 hour 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SACRAMENTO CA 235 PM PDT Wed Jul 30 2014 .Synopsis... Another day of Sierra crest showers and thunderstorms tomorrow (less coverage than today)...when a drying trend. Then a return to Sierra showers and t-storms early/mid week next week. && .Discussion... Activity started pretty early today with showers and thunderstorms along highest terrain from Near Plumas county all the way south to Tuolumne County. Expect this activity to continue off and on this afternoon but probably end a bit quicker than normal by early afternoon as latest moisture plume pushes off to the east. HRRR hinting at some weak possible returns in valley near Sacramento...as there is some mid level instability in the area...but rally lacking a trigger for valley and should result in ACCUS. Thursday...still some instability lingering around highest terrain for isolated activity...less than today...again confined to crest. Friday and Saturday...westerly flow pushes moisture and instability out of area for dry weather. Should see temperatures at to slightly above normal during this time. Rasch && .Extended Discussion (Sunday through Wednesday) Upper ridge positioned over the Intermountain West Sunday as weak upper trough moves through NorCal. Increased mid-level southwesterly flow Sunday will keep the threat of afternoon thunderstorms outside of the forecast area with only a slight chance over the higher Sierra Nevada, south of Highway 50, on Monday. Models then depict upper ridging from the Desert SW rebuilding northwestward over Interior NorCal next week. Mid-level flow begins to turn more southerly Tue and southeasterly Wed with another slug of monsoonal moisture working its way into the forecast area. Threat of afternoon thunderstorms expands northward along the Sierra Tuesday, through Western Plumas into the Shasta and coastal mountains Wednesday. Near normal high temperatures expected through early next week then warming upwards of 5 degrees above normal Wednesday. && .Aviation... Upr rdg movs E as SWly flow alf with EPAC upr trof incrs Thu. Isold tstms poss ovr hyr mtn trrn of the Cstl rnge, Shasta, Plumas, and Siernev thru 05z Thu otrw VFR conds ovr Intr NorCal nxt 24 hrs. Isold SWly sfc wnd gsts to 25 kts poss ovr hyr mtn trnn and thru Delta aftns into eves. && .STO Watches/Warnings/Advisories... None. &&
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 322 PM PDT WED JUL 30 2014 CAZ068-302300- WESTERN PLUMAS COUNTY/LASSEN PARK CA- 322 PM PDT WED JUL 30 2014 THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... CENTRAL PLUMAS COUNTY IN NORTHERN CALIFORNIA UNTIL 400 PM PDT AT 316 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR PAXTON..MOVING WEST AT 5 MPH. THIS STORM WAS PRODUCING VERY HEAVY RAIN AND HAIL UP TO HALF AND INCH IN DIAMETER. THE HEAVY RAIN MAY CAUSE SOME MINOR ROCK SLIDES NEAR THE AREA WHERE HIGHWAYS 89 AND 70 INTERSECT. LOCATIONS IMPACTED INCLUDE... CRESCENT HILLS... HIGHWAY 89 AND HIGHWAY 70. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 4001 12108 4020 12109 4020 12091 4005 12086 TIME...MOT...LOC 2218Z 079DEG 6KT 4006 12105 RB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 355 PM PDT WED JUL 30 2014 CAZ068-302345- WESTERN PLUMAS COUNTY/LASSEN PARK CA- 355 PM PDT WED JUL 30 2014 THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... NORTHWESTERN PLUMAS COUNTY IN NORTHERN CALIFORNIA UNTIL 445 PM PDT AT 351 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR LAKE ALMANOR..MOVING NORTHEAST AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING AND VERY HEAVY RAINFALL. BOATERS SHOULD SEEK THE SAFETY OF SAFE HARBOR. LOCATIONS IMPACTED INCLUDE... ALMANOR... LAKE ALMANOR... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 4031 12119 4022 12100 4013 12119 4022 12132 TIME...MOT...LOC 2254Z 229DEG 7KT 4020 12121 RB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 402 PM PDT WED JUL 30 2014 CAZ069-302345- WEST SLOPE NORTHERN SIERRA NEVADA CA- 402 PM PDT WED JUL 30 2014 THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... SOUTH CENTRAL ALPINE COUNTY IN CENTRAL CALIFORNIA EXTREME NORTH CENTRAL TUOLUMNE COUNTY IN CENTRAL CALIFORNIA UNTIL 445 PM PDT AT 359 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR DARDANELLE AND HIGHWAY 108. THIS STORM WAS MOVING NORTHWEST AT 5 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING AND VERY HEAVY RAINFALL. LOCATIONS IMPACTED INCLUDE... KENNEDY MEADOW... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 3823 11980 3836 11992 3849 11979 3840 11965 TIME...MOT...LOC 2301Z 318DEG 2KT 3834 11983 RB
The Beale AFB radar (KBBX), 90 km away, was scanning. The volume nearest the first event began at 23:28 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain fell on the west shore of Lake Almanor. Road flooding on state Highway 89 on the west side of the lake.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2014Every state in 2014This day in weather historyWarnings in California, July 2014
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: 537686.