California, 2020Excessive Heat and Heat in California, April 24 to 30, 2020
April 24 to 30, 2020 · NWS SGX · 11 events in 6 counties and zones
High pressure built into Southern California on April 22nd and continued through April 30th. The deserts experienced the most extreme heat, but the coast and valleys also had multiple days with record breaking heat.
Every event with a place to put it; 11 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 11
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.
High pressure built into Southern California on April 22nd and continued through April 30th. The deserts experienced the most extreme heat, but the coast and valleys also had multiple days with record breaking heat. Palm Springs International Airport recorded 8 days with high temperatures exceeding 101 degrees, which has not occurred since April of 1945. According to San Diego County, there were 31 heat related calls placed by residents from April 24th through the 30th, with 22 of them transported to the hospital. With onshore flow and high pressure overhead, dense fog occurred at a few coastal San Diego locations on April 25th and 26th.
Event by event
6 dense fog, 3 excessive heat, 2 heat. Local standard time, as filed.
Heat, San Bernardino and Riverside County Valleys - the Inland Empire
- When
- April 24, 10:00 AM PST to April 25, 5:00 PM PST
- Where
- San Bernardino and Riverside County Valleys - the Inland Empire forecast zone
- Reported by
- ASOS
- Coordinates
- 34.293, -116.086 (the zone’s center; the record gives no point)
High temperatures in the upper 90s to 101 degrees were observed in the Inland Empire on the 24th and 25th.
Heat, Orange County Inland
- When
- April 24, 10:00 AM PST to April 25, 5:00 PM PST
- Where
- Orange County Inland forecast zone
- Reported by
- ASOS
- Coordinates
- 33.677, -117.776 (the zone’s center; the record gives no point)
High temperatures in the upper 90s to 100 degrees were observed in Inland Orange County on the 24th and 25th.
Excessive Heat, Coachella Valley
- When
- April 24, 1:00 PM PST to April 30, 8:00 PM PST
- Where
- Coachella Valley forecast zone
- Reported by
- ASOS
- Coordinates
- 33.744, -115.994 (the zone’s center; the record gives no point)
High temperatures of 100 to 106 degrees were observed in the Coachella Valley from the 24th through the 30th.
Excessive Heat, San Diego County Deserts
- When
- April 24, 1:00 PM PST to April 30, 8:00 PM PST
- Where
- San Diego County Deserts forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
High temperatures of 100 to 105 degrees were recorded in the San Diego County deserts from the 24th through the 30th.
Dense Fog, San Diego County Coastal Areas
- When
- April 25, 4:00 AM PST to 8:00 AM PST
- Where
- San Diego County Coastal Areas forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
Brown Field reported 1/4 mile visibility from 0400 to 0800 PST.
Dense Fog, San Diego County Coastal Areas
- When
- April 25, 4:00 AM PST to 8:00 AM PST
- Where
- San Diego County Coastal Areas forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
Carlsbad Airport (CRQ) reported 1/4 mile visibility from 0400 to 0800 PST.
Dense Fog, San Diego County Coastal Areas
- When
- April 25, 4:00 AM PST to 8:00 AM PST
- Where
- San Diego County Coastal Areas forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
MCAS Miramar (NKX) reported 1/4 mile visibility from 0400 to 0800.
Dense Fog, San Diego County Coastal Areas
- When
- April 25, 10:00 PM PST to 11:00 PM PST
- Where
- San Diego County Coastal Areas forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
Brown Field reported 1/8 mile visibility from 2200 to 2300 PST.
Dense Fog, San Diego County Coastal Areas
- When
- April 26, 1:00 AM PST to 3:00 AM PST
- Where
- San Diego County Coastal Areas forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
Montgomery Field (MYF) reported dense fog with visibility of 1/4 mile from 0100 to 0300 PST.
Dense Fog, San Diego County Coastal Areas
- When
- April 26, 5:00 AM PST to 7:00 AM PST
- Where
- San Diego County Coastal Areas forecast zone
- Reported by
- ASOS
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
San Diego Airport (SAN) reported dense fog with 1/4 mile visibility between 0500 and 0700 PST.
Excessive Heat, Apple and Lucerne Valleys
- When
- April 28, 9:00 AM PST to April 29, 7:00 PM PST
- Where
- Apple and Lucerne Valleys forecast zone
- Reported by
- ASOS
- Coordinates
- 34.841, -116.178 (the zone’s center; the record gives no point)
High temperatures of 90 to 95 degrees were recorded in the High Desert on the 28th and 29th.
- Heat
- Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.
- Excessive Heat
- Heat at or above the local excessive heat warning criteria, or heat that caused deaths.
- Dense Fog
- Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Tornadoes and Hail in Texas, April 24, 20201 injured · $635,000 · EF2 · 8 events
- Cold in California, April 24 to 28, 20201 death · 1 event
- Hail and Damaging Winds in Virginia, April 24, 2020$67,000 · 1.5 in hail · 32 events
- Tornado and Damaging Winds in Arkansas, April 24, 2020$40,000 · EF1 · 5 events
- Hail and Damaging Winds in Oklahoma, April 24, 2020$22,000 · 1.5 in hail · 26 events
- Hail and Damaging Winds in Louisiana, April 24, 20204 in hail · 38 events
- Hail and Damaging Winds in Texas, April 24, 20202 in hail · 34 events
- Hail and Damaging Winds in Texas, April 24, 2020$14,000 · 2 in hail · 23 events
- Hail and Damaging Winds in Arkansas, April 24 to 25, 2020$15,000 · 1.75 in hail · 14 events
- Dense Fog in Illinois, April 24, 202019 events
- Marine Thunderstorm Winds in South Atlantic Coastal Waters, April 24, 202059 kt wind · 12 events
- Marine Thunderstorm Winds in Gulf of Mexico, April 24, 202011 events
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: 887755, 887757, 887758, 887759, 889637, 889638, 889639, 889640, 889641, 889642, 887760.