California, 2019

Excessive Heat in California, September 4, 2019

September 4, 2019 · NWS PSR · 3 events in 3 counties and zones

Dangerous heat led to excessive heat warning conditions across parts of southeast California in early September.

Where it happened

Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
3

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.

What happened

The episode as NWS PSR wrote it up.

Dangerous heat led to excessive heat warning conditions across parts of southeast California in early September.

What forecasters said that day

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 Phoenix, AZ wrote its last area forecast discussion before the first event at Sep 4, 4:32 AM PST, 5 hours 28 minutes earlier.

Area forecast discussion, Sep 4, 4:32 AM PST, 5 hours 28 minutes before
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The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

3 excessive heat. Local standard time, as filed.

Excessive Heat, Palo Verde Valley

When
September 4, 10:00 AM PST to 8:00 PM PST
Where
Palo Verde Valley forecast zone
Reported by
County Official
Coordinates
33.392, -115.679 (the zone’s center; the record gives no point)

Excessive Heat, Chuckwalla Valley

When
September 4, 10:00 AM PST to 8:00 PM PST
Where
Chuckwalla Valley forecast zone
Reported by
County Official
Coordinates
33.744, -115.994 (the zone’s center; the record gives no point)

Excessive Heat, Imperial Valley

When
September 4, 10:00 AM PST to 8:00 PM PST
Where
Imperial Valley forecast zone
Reported by
County Official
Coordinates
33.040, -115.365 (the zone’s center; the record gives no point)

What these are

Excessive Heat
Heat at or above the local excessive heat warning criteria, or heat that caused deaths.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in California in 2019Every state in 2019This day in weather historyWarnings in California, September 2019

Sources

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: 931230, 931231, 931233.