A mid to upper-level low pressure system moved southward and parked itself off the north-central California coast. Widespread rainfall occurred on the 18th, with some embedded heavier rain.
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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 EKA wrote it up.
A mid to upper-level low pressure system moved southward and parked itself off the north-central California coast. Widespread rainfall occurred on the 18th, with some embedded heavier rain. The next couple of days showers and isolated thunderstorms |observed with locally very heavy rain. One such shower brought just over 2.5 inches of rain in 45 minutes near the town of Willits and caused some flooding on the Willits Bypass. Several SPSs and FLAs were issued during the span of a couple days for stronger thunderstorms and the accompanying 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 Eureka, CA wrote its last area forecast discussion before the first event at Sep 21, 1:50 PM PST, 2 hours 10 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Eureka CA 250 PM PDT Wed Sep 21 2022 .SYNOPSIS...Showers and isolated thunderstorms are occurring again across the eastern interior zones today but should diminish and end tonight. Dry and warmer weather conditions are forecast for the latter half of the week into the weekend. && .DISCUSSION...Thunderstorms and showers are occurring once again this afternoon but mainly only across Trinity County. Some heavy showers and briefly intense thunderstorms were present along Hwy 3 around Hayfork and the Coffee Creek areas but quickly diminished in intensity after peaking for only a few minutes. Radar returns suggested heavy showers with small hail embedded (1/4 inch) underneath the stronger returns. Another concern was the potential of consistent moderate to heavy showers across the Monument and River Complex burn scars. Based on estimated rain rates from KMAX and KBHX it appears that only 0.10-0.15 inches per hour were detected and are expected to continue for another hour or so. So debris flow issues are not too much of a concern however some creeks and small streams are likely filling pretty well in and around NE Trinity County this afternoon. Strengthening westerly flow will likely push storms off to the east quickly late this afternoon and early this evening as the low center tracks to the NE Thus, expect showers and storms to come to an end quickly early this evening while large scale subsidence develops over the area. Shallow moist air will probably result in some fog along the coast and in the valleys due to recent rain. Fog and low clouds in the interior valleys will mitigate or make it impossible for frost to form tonight. Dry and warmer weather are forecast for Thursday and Friday as 500mb heights increase and 850mb temperatures warm in the wake of the upper low. Ensemble guidance continues to indicate 850mb warming with modest offshore flow over the weekend. Above normal daytime temperatures and several days of nice fall weather are expected. && .AVIATION...Significant IFR-MVFR cloudiness (confirmed by an ACV pirep) persisted along the Redwood Coast into afternoon. However, CEC reported many hours of LIFR conditions today. An upper low continued across the region and has been a trigger for convective activity across NW California. Showers along the coast dwindled by afternoon even though low chances continued in the afternoon as reflected on radar and satellite data. Better chances for shower and or thunderstorms continued across the inland mountains today. Another round of low clouds will be possible again late tonight through Thursday morning along the coast. /TA && .MARINE...Not many changes to the previous forecast. Light to gentle breezes will persist over the waters tonight and into Thursday. Northerlies will return and ramp up from south to north starting late Thursday afternoon, with moderate to fresh breezes developing over the waters by Friday. These winds are expected to reach advisory-level Thursday night for the southern outer waters and for the northern outer waters Friday afternoon. These elevated winds will persist through much of the weekend and gradually weaken throughout Sunday. Several mid to longer-period swell will dominate the sea state over the next day and a half before short- period seas build in response to the increasing northerlies late this week. && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... None. && Visit us at https://www.weather.gov/eureka Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png
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</html>The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
CoCoRaHS report of 2.58 inches of rain in 45 minutes. 1 to 2 inches of water was observed on the Willits Bypass which stopped traffic. Water quickly subsided after the thunderstorm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2022Every state in 2022This day in weather historyWarnings in California, September 2022
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: 1052125.