Heat in California, July 5 to 6, 2007

Name: Heat in California, July 5 to 6, 2007
Start: 2007-07-05T11:00
End: 2007-07-06T20:00
Location: California

July 5 to 6, 2007 · NWS HNX · 11 events in 11 counties and zones

Strong high pressure aloft developed over the Desert Southwest at the beginning of July, and built westward into California. This brought a warming trend to the central California interior, with temperatures in the central and southern San Joaquin Valley reaching triple digits on Independence Day.

The toll

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.

What happened

The episode as NWS HNX wrote it up.

Temperatures across central California warmed 7-10 degrees from July 3rd to the 4th, and again from the 4th to the 5th. The Southern Sierra Nevada and the Kern County deserts saw temperatures below 5000 feet push into the triple digits, with Yosemite Valley hitting 100 on the 3rd, 109 on the 4th, and 110 on the 5th. Lake Isabella had a high of 103 on July 3rd, rising to 112 degrees Independence Day, with the same high the next day. On the San Joaquin Valley floor, Fresno had a high of 104 on the 4th, followed by 111 on the 5th; and Bakersfield warmed from an Independence Day high of 100 degrees to a high of 108 the next day.

In the Indian Wells Valley, the China Lake Naval Weapons Test Center had a high of 110 degrees or greater on each of the first five days of July.

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 Hanford, CA wrote its last area forecast discussion before the first event at Jul 5, 9:02 AM PST, 1 hour 58 minutes earlier.

Area forecast discussion, Jul 5, 9:02 AM PST, 1 hour 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
1002 AM PDT THU JUL 5 2007

.DISCUSSION...HOTTEST DAY OF THE YEAR ON TAP FOR THE CENTRAL CA
INTERIOR WITH STRONG HIGH PRESSURE CENTERED OVER NEVADA. AREA
RAOBS AS WELL AS THE FRESNO LOW LEVEL SOUNDING REFLECT THE
ANTICIPATED WARMING IN THE LOWER LEVELS. 24HR TRENDS INDICATE
WARMING AT THE SURFACE AS WELL...LARGELY A RESULT OF THE HIGHER
MINS OVERNIGHT. THIS TREND SHOULD MODERATE SOME THROUGH THE DAY
AND HIGHS ARE EXPECTED TO TOP OUT GENERALLY FROM 105-108 ACROSS
THE VALLEY FLOOR. A WEAKENING RIDGE WILL LEAD TO SOME VERY SLIGHT
COOLING EACH DAY THROUGH THE WEEKEND WITH HIGHS REMAINING A LITTLE
ABOVE NORMAL. MAINLY CLEAR SKIES WILL CONTINUE THOUGH WE MAY START
TO SEE SOME AFTERNOON CU FIRE UP OVER THE SIERRA CREST. WV IMAGERY
SHOWS SOME UPPER LEVEL MOISTURE MOVING IN FROM THE SOUTH...BUT
MODEL RH X-SECTIONS ARE NOT AT ALL IMPRESSIVE TODAY AND ONLY
SLIGHTLY BETTER ON FRIDAY. IT IS NOTED THAT SPC HAS THE SOUTHERN
SIERRA NEVADA FROM YOSEMITE TO KINGS CANYON OUTLINED IN THE
GENERAL RISK OF TSTORMS TODAY. BUT WILL REFRAIN FROM ANY MENTION
IN OUR ZONES AS CONVECTIVE PARAMETERS ARE WEAK. NO UPDATE PLANNED
FOR THIS MORNINGS FORECAST.

&&

.AVIATION...
VFR CONDITIONS WILL PREVAIL THROUGH 18Z FRIDAY. FOR SPECIFIC
DETAILS...PLEASE REFER TO THE TAFS FOR KMCE...KFAT AND KBFL...AND
TWEB ROUTES 421 AND 423.

&&

.AIR QUALITY ISSUES...
THE VALLEY AIR DISTRICT HAS DECLARED THURSDAY, JULY 5, 2007 A
SPARE THE AIR DAY IN FRESNO, KERN, KINGS, MERCED AND TULARE
COUNTIES.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING UNTIL 9 PM PDT THIS EVENING FOR CAZ295-297.

&&

DCH/BEAN

WEATHER.GOV/HANFORD

Hazardous weather outlook, Jul 5, 5:03 AM PST, 5 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
603 AM PDT THU JUL 5 2007

CAZ089>099-061200-
WEST CENTRAL SAN JOAQUIN VALLEY-EAST CENTRAL SAN JOAQUIN VALLEY-
SOUTHWESTERN SAN JOAQUIN VALLEY-SOUTHEASTERN SAN JOAQUIN VALLEY-
MARIPOSA MADERA AND FRESNO COUNTY FOOTHILLS-
TULARE COUNTY FOOTHILLS-KERN COUNTY MOUNTAINS-
SIERRA NEVADA FROM YOSEMITE TO KINGS CANYON-
TULARE COUNTY MOUNTAINS-INDIAN WELLS VALLEY-
SOUTHEASTERN KERN COUNTY DESERT-
603 AM PDT THU JUL 5 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF INTERIOR CENTRAL
CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

THE RED FLAG WARNING FOR VERY LOW HUMIDITIES REMAINS IN EFFECT FOR
THE MOUNTAINS OF TULARE AND KERN COUNTIES UNTIL 9 PM PDT TONIGHT.
PLEASE REFER TO THE LATEST RED FLAG WARNING ISSUED BY THE NATIONAL
WEATHER SERVICE IN HANFORD AT /WWUS86 KHNX/ OR /SFORFWHNX/ FOR
SPECIFIC DETAILS.

IN ADDITION...STRENGTHENING HIGH PRESSURE WILL ALLOW FOR WELL
ABOVE NORMAL TEMPERATURES THIS AFTERNOON INTO TONIGHT. PLEASE
EXERCISE CAUTION WITH ANY OUTDOOR ACTIVITIES YOU MAY ENGAGE IN.
REFER TO THE LATEST SPECIAL WEATHER STATEMENT ISSUED BY THE
NATIONAL WEATHER SERVICE IN HANFORD AT /WWUS86 KHNX/ OR
/SFOSPSHNX/ FOR FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

STRONG HIGH PRESSURE WILL PERSIST OVER THE WESTERN UNITED STATES
THROUGH SATURDAY BEFORE WEAKENING SLIGHTLY ON SUNDAY AND MONDAY.
HIGH TEMPERATURES WILL CONTINUE TO REMAIN WELL ABOVE NORMAL
THROUGH SATURDAY AND DESPITE A SLIGHT DROP IN TEMPERATURES STILL REMAIN
ABOVE NORMAL SUNDAY THROUGH WEDNESDAY. PLEASE REFER TO THE LATEST
SPECIAL WEATHER STATEMENT ISSUED BY THE NATIONAL WEATHER SERVICE
IN HANFORD AT /WWUS86 KHNX/ OR /SFOSPSHNX/ FOR FURTHER DETAILS.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS TO THE SAN JOAQUIN VALLEY NATIONAL WEATHER SERVICE
OFFICE.

SANGER

WEATHER.GOV/HANFORD

Event by event

11 heat. Local standard time, as filed.

Heat, E Central S.J. Valley

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: E Central S.J. Valley forecast zone
Reported by: ASOS

Heat, Indian Wells Vly

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Indian Wells Vly forecast zone
Reported by: ASOS

Heat, Kern Cty Mtns

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Kern Cty Mtns forecast zone
Reported by: ASOS

Heat, S Sierra Foothills

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: S Sierra Foothills forecast zone
Reported by: ASOS

Heat, S Sierra Mtns

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: S Sierra Mtns forecast zone
Reported by: ASOS

Heat, Se Kern Cty Desert

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Se Kern Cty Desert forecast zone
Reported by: ASOS

Heat, Se S.J. Valley

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Se S.J. Valley forecast zone
Reported by: ASOS

Heat, Sw S.J. Valley

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Sw S.J. Valley forecast zone
Reported by: ASOS

Heat, Tulare Cty Foothills

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Tulare Cty Foothills forecast zone
Reported by: ASOS

Heat, Tulare Cty Mtns

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: Tulare Cty Mtns forecast zone
Reported by: ASOS

Heat, W Central S.J. Valley

When: July 5, 11:00 AM PST to July 6, 8:00 PM PST
Where: W Central S.J. Valley forecast zone
Reported by: ASOS

What these are

Heat: Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.

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

The same day elsewhere

Every storm in California in 2007 Every state in 2007 This day in weather history Warnings in California, July 2007

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: 51634, 51635, 51636, 51637, 51638, 51639, 51640, 51641, 51642, 51643, 51644.