Following the passage of the upper trough which moved across the area on March 29. A cold an unstable airmass prevailed over central California on March 30.
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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 HNX wrote it up.
Following the passage of the upper trough which moved across the area on March 29. A cold an unstable airmass prevailed over central California on March 30. As a result, showers and a few thunderstorms developed over the San Joaquin Valley resulting in localized flooding as well as at least one funnel cloud report.
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 Mar 30, 12:05 AM PST, 5 hours 37 minutes earlier.
Area Forecast Discussion National Weather Service Hanford CA 105 AM PDT Thu Mar 30 2023 .SYNOPSIS... Rain tapers off this morning with snow dissipitating by the afternoon. Dry weather starts this afternoon and continues through Sunday morning. Snow starts up in the Sierra early Sunday afternoon. Possibility of showers begin late Sunday night into early Monday morning. Flooding remains a concern through the weekend due to high flows and runoff. && .DISCUSSION... A few remaining showers were visible on the radar early this morning. However, the bulk of these showers are going to end by 10 AM. The snow showers over the Sierra Nevada and Tehachapi mountains are going to hang on around until this afternoon. The rain and snow are ending as the trough that brought this latest storm slides to our east. Both GEFS and European model ensembles are pointing to a zonal flow for the weekend for our area which will bring in a much needed dry break. However, both the GEFS and European ensembles are showing a trough sliding in late Sunday night into early Monday morning. The two ensembles differ over the location of this trough as it slides down. The European model has the trough sliding down through Nevada while the GEFS has it sliding down through the Sacramento and San Joaquin Valleys and the Sierra Nevada. Right now, this trough is being forecast to bring up to 6 inches of snow over the Sierra. Probabilistic models have less than 25 percent chance of only five hundredths of an inch of rain in the Valley Monday through Thursday. Winds will be monitored with this trough as the positioning of the trough may trigger a Mono Wind event. Flooding remains a concern through the weekend. A flood watch remains in effect in Stevinson as the Merced River remains above flood stage at between 71.3 and 71.4 feet. In addition, high flow releases from dams will continue through the weekend including Friant and Pine Flat Dams. If a roadway is flooded, please turn around and find an alternate route. && .AVIATION... VFR conditions will prevail for the next 24 hours. However, areas of MVFR and IFR conditions are possible in heavier showers in the Valley and mountain obscurations until about 18Z today. && .AIR QUALITY ISSUES... ISSUED: 03/29/2023 14:44 EXPIRES: 03/30/2023 23:59 None. && .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 and/or to provide feedback. && .HNX WATCHES/WARNINGS/ADVISORIES... Wind Advisory until 5 AM PDT early this morning for CAZ337-339. Flood Watch until 5 AM PDT early this morning for CAZ317>322. Winter Weather Advisory until 11 AM PDT this morning for CAZ333>336. && JPK weather.gov/hanford
The San Joaquin Valley radar (KHNX), 73 km away, was scanning. The volume nearest the first event began at 13:40 UTC.
1 flood, 1 funnel cloud. Local standard time, as filed.
California Highway Patrol reported the County Line Rd. was completely flooded between Rd. 192 and Rd. 200.
Report posted on Facebook of a funnel cloud in Arvin.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2023Every state in 2023This day in weather historyWarnings in California, March 2023
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: 1079548, 1079549.