A Pacific cold frontal system pushed through the area during the morning of October 8 spreading widespread precipitation across the area. Several stations in the eastern portion of the San Joaquin Valley and the Sierra Nevada range measured between a tenth and a four tenths of an inch of rainfall with portions of Fresno and Madera Counties picking up locally heavy showers which produced higher…
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The episode as NWS HNX wrote it up.
A Pacific cold frontal system pushed through the area during the morning of October 8 spreading widespread precipitation across the area. Several stations in the eastern portion of the San Joaquin Valley and the Sierra Nevada range measured between a tenth and a four tenths of an inch of rainfall with portions of Fresno and Madera Counties picking up locally heavy showers which produced higher precipitation amounts. Several high elevation SNOTELs picked up an estimated one to three inches of new snowfall. The precipitation ended by late afternoon as the storm moved east of 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 Hanford, CA wrote its last area forecast discussion before the first event at Oct 8, 3:35 AM PST, 1 hour 25 minutes earlier.
Area Forecast Discussion National Weather Service Hanford CA 435 AM PDT Fri Oct 8 2021 .SYNOPSIS...A Pacific storm system will bring much cooler temperatures and a chance of mainly light precipitation today. We will see unsettled weather continue across the Sierra Nevada on Saturday and again on Monday as a pair of cold weather systems drop southward through the Great Basin. Gusty north to northwest winds are expected on Monday and Tuesday. && .DISCUSSION... Light to moderate shower activity is increasing across the central California interior, tracking northeastward, as a Pacific cold frontal system continues to drop south through the region. HRRR indicates continued increase in coverage and intensity during the next few hours, with increasing instability sufficient for a few thunderstorms, mainly over the Sierra north of Fresno County but still a few strikes possible further south. Blended model guidance QPF shows just a few hundredths of an inch in the SJ Valley and up to 1/4 inch in the foothills. Higher Sierra elevations can see around 1/2 inch, with snow accumulating above around 7000 ft. Snow amounts in the Yosemite vicinity are expected to total around 3-6 inches and a Winter Weather Advisory is in effect there through 5 PM this afternoon. This passing system will bring some gusty winds across the mountain and desert areas, but high res model data keeps gusts just below advisory levels. Another noticeable affect of the passing front today will be significantly cooler temperatures, with highs this afternoon around 14-18 degrees below normal. An additional impulse dropping through the trough will maintain cool northerly flow over our area Saturday, then warming slightly to around 10 degrees below normal on Sunday as weak ridging sets up overhead. Another approaching trough is progged to drop through the region early next week. This inside slider type system will bring lesser precipitation amounts over the Sierra zones Monday into early Tuesday, but more significantly will bring increased winds as onshore surface pressure gradients increase to around 17 mb. The 2nd half of next week will see dry and warming conditions under weak ridging, but afternoon highs are still expected to remain below seasonal averages. By Friday, there is only around a 30 percent chance that high temperatures will reach or exceed normal highs. && .AVIATION...Increasing areas of MVFR conditions and local mountain obscuring IFR in developing showers and isolated thunderstorms over the Sierra Nevada through 00Z Sat. Mountain obscuring IFR visibilities due to smoke and haze will continue near active wildfires. MVFR ceilings in showers in the San Joaquin Valley, including the TAF sites, through 22Z Friday. Otherwise, VFR conditions will prevail over the next 24 hours. && .AIR QUALITY ISSUES... On Friday October 8 2021... Unhealthy for sensitive groups in Sequoia National Park and Forest. Further information is available at Valleyair.org && .CERTAINTY... The level of certainty for days 1 and 2 is high. The level of certainty for days 3 through 7 is medium. Certainty levels include low...medium...and high. Please visit www.weather.gov/hnx/certainty.html for additional information an/or to provide feedback. && .HNX WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until 5 PM PDT this afternoon for CAZ323. && public...JEB aviation....JEB weather.gov/hanford
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
A trained spotted reported heavy rainfall for almost two hours in north Fresno and Clovis with ponding of water reported on several roadways.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2021Every state in 2021This day in weather historyWarnings in California, October 2021
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: 978598.