Hot temperatures brought widespread Moderate HeatRisk and Areas of Major HeatRisk over a late July weekend. Sacramento set a new daily high of 108 degrees for July 21st.
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.
Hot temperatures brought widespread Moderate HeatRisk and Areas of Major HeatRisk over a late July weekend. Sacramento set a new daily high of 108 degrees for July 21st. Redding Municipal Airport and Red Bluff Airport tied the previous record daily high of 112 degrees for July 21st. Redding then set a new daily record high temperature of 113 degrees on July 22nd.
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 21, 12:45 AM PST, 8 hours 15 minutes earlier.
Area Forecast Discussion National Weather Service Sacramento CA 145 AM PDT Fri Jul 21 2023 .SYNOPSIS... Hot and dry weather through the weekend. Temperatures will peak on today and Saturday with areas of Major Heat Risk. Not as hot next week. && .DISCUSSION... Skies are clear early this morning. The marine layer is being suppressed by strengthening high pressure over the region (profilers show the depth has lowered below 1k ft). Onshore surface pressure gradient continues to wane, though a weak Delta Breeze persists at Travis AFB with southwesterly winds around 20 mph. Current temperatures are milder compared to 24 hours ago with most locations running about 2-6 degrees warmer. At the lower elevations, readings range from the mid 60s in the Delta to around 80 in some spots across the northern Sacramento Valley. Heat will continue to build over NorCal, peaking today and Saturday, as high pressure builds up from the southeast. Hottest readings are expected in the northern Sacramento Valley this afternoon as light to moderate northerly breezes enhance warming. Highs in Redding and Red Bluff are expected to top out around 110-113 degrees. Elsewhere, most of the Central Valley will see highs from 105-110. Overnight lows will also be warm across the valley tonight and Saturday night with lows only in the mid 60s to around 80.The result will be widespread moderate heat risk with areas of major heat risk. A Heat Advisory will be in effect from 11 AM today to 11 PM Saturday. A modest cooling trend is forecast to begin Sunday as trough over the Gulf of Alaska approaches and brings a return to stronger onshore flow. Breezy southwest winds are possible Sunday evening through the Delta and over higher terrain, especially the northern Sierra. Hot temperatures may cause heat related illnesses, especially for those spending prolonged periods outside during the hottest part of the day. People should continue to practice heat safety, especially during the Friday through Saturday time-frame where temperatures will be the hottest. Additionally, rivers are still running fast and cold across portions of interior NorCal, and people should wear a life jacket and be cautious around waterways! && .EXTENDED DISCUSSION (Tuesday THROUGH Friday)... Interior NorCal sandwiched between upper troughing to the NW and upper high over Desert SW through the extended forecast period. Dry weather will result with high temperatures near to slightly below normal. Locally gusty wind at times, mainly near the Delta and over higher terrain. && .AVIATION... VFR conditions over interior NorCal next 24 hours. Sfc wind mainly at or below 12 kts except vcnty of Delta SW wind 15-20 kts at times. && .STO WATCHES/WARNINGS/ADVISORIES... Heat Advisory from 11 AM this morning to 11 PM PDT Saturday for Carquinez Strait and Delta-Central Sacramento Valley-Motherlode- Mountains Southwestern Shasta County to Western Colusa County- Northeast Foothills/Sacramento Valley-Northern Sacramento Valley- Northern San Joaquin Valley-Shasta Lake Area / Northern Shasta County-Southern Sacramento Valley-West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park. &&
11 heat, 1 avalanche. Local standard time, as filed.
Sacramento set a new daily high of 108 degrees for July 21st. Daytime highs across the zone were in the 100 to 110 degree range.
Redding Municipal Airport and Red Bluff Airport tied the previous record daily high of 112 degrees for July 21st. Redding then set a new daily record high temperature of 113 degrees on July 22nd. Daytime highs across the zone were in the 100 to 110 degree range.
Sacramento set a new daily high of 108 degrees for July 21st.
Daytime highs reached the 100 to 105 degree range across this zone, with overnight lows in the 70s.
Daytime highs were in the 100 to 110 degree range across this zone.
Daytime highs were in the upper 90s to 105 degree range across this zone.
Daytime highs were in the 90s to 105 degree range across this zone, with overnight lows in the mid 70s to near 80 degree range.
Daytime highs were in the 100 to 105 degree range across this zone.
Daytime highs were in the upper 90s to 105 degree range.
Daytime highs were in the upper 90s to 105 degree range.
Daytime highs were in the 90s to low 100s below 6000 feet in this zone.
Daytime highs were in the upper 80s to near 100 degrees below 6000 feet in this zone.
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, July 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: 1132277, 1125093, 1125094, 1132280, 1132282, 1132283, 1132284, 1132285, 1132290, 1132291, 1132292, 1132293.