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- Summer 1999 "Update" Article -
CIMIS develops new ETo zone map
Copyright © 1999. All rights reserved.
CIMIS and the University of California, Davis, have developed a new reference evapotranspiration (ETo) zone map for California. The map is based on average monthly ETo values for several sites throughout California and consists of the following 18 zones:
1.Coastal Plains Heavy Fog Belt. This zone has the lowest ETo in California and is characterized by dense fog.
2. Coastal Mixed Fog Belt. Higher ETo than zone 1 and less fog.
3. Coastal Valleys and Plains and North Coast Mountains. More sunlight than zone 2.
4. South Coast Inland Plains and Mountains North of San Francisco. More sunlight and higher summer ETo than zone 3.
5. Northern Inland Valleys. Valleys north of San Francisco.
6. Upland Central Coast and Los Angles Basin. Higher elevation coastal areas.
7. Northeastern Plains.
8. Inland San Francisco Bay Area. Inland area near San Francisco with some marine influence.
9. South Coast Marine to Desert Transition. Inland area between marine and desert climates.
10. North Central Plateau and Central Coast Range. Cool, high elevation areas with strong summer sunlight. This zone has limited climate data and the zone selection is somewhat subjective.
11. Central Sierra Nevada. Sierra Nevada Mountain valleys east of Sacramento with some influence from the delta breeze in summer.
12. East Side Sacramento-San Joaquin Valley. Low winter and high summer ETo with slightly lower ETo than zone 14.
13. Northern Sierra Nevada. Northern Sierra Nevada mountain valleys with less marine influence than zone 11.
14. Mid-Central Valley Southern Sierra Nevada, Tehachapi and High Desert Mountains. High summer sunshine and wind in some locations.
15. Northern and Southern San Joaquin Valley. Slightly lower winter ETo due to fog and slightly higher summer ETo than zones 12 and 14.
16. Westside San Joaquin Valley and Mountains East and West of Imperial Valley.
17. High Desert Valleys. Valleys in the high desert near Nevada and Arizona.
18. Imperial Valley, Death Valley and Palo Verde. Low desert areas with high sunlight and considerable heat advection.
Because there is a limited supply, the map will be distributed mainly to local and private agencies.
For More CIMIS information....
CIMIS information is published quarterley in the CATI Update newsletter. Articles are provided by the California Department of Water Resources, CIMIS program staff.
For more information about CIMIS or its programs, contact any of the following representatives at these offices:
Northern District
Eugene Pixley
(916) 529-7329
pixley@water.ca.govSan Joaquin District
Kent Frame
(559) 445-5428
kframe@water.ca.govCentral District
Mark Rivera
(916) 227-7603
mrivera@water.ca.govSouthern District
Sergio Fierro
(818) 543-4601
sergiof@water.ca.govIf you are unable to reach a CIMIS representative near you, call the CIMIS Helpline at 1-800-922-4647.
{ CATI , CIMIS, CATI - Current Project , "Update" Newsletter - 1999 }
Copyright © 2000. All rights reserved.
CALIFORNIA AGRICULTURAL TECHNOLOGY INSTITUTE - CATI
College of Agricultural Sciences and Technology
California State University, Fresno
