An influx of tropical moisture interacting with a separate storm system could generate light showers across the region on Sunday into Monday. There remains a fair amount of uncertainty in north/westward extent of rain as well as totals. For now, the highest chances of rain are focused in the mountains and deserts of San Diego/Riverside counties.
Data Courtesy of San Diego Weather Forecast Office
Evaporative Cooler Effectiveness by City
Thousand Palms
Outside Temp101°F
Dew Point54°F
Est. Output77°F
Updated: Sep 26, 3:06 PM PDT
Palm Desert (Hwy 111 & El Paseo)
Outside Temp101°F
Dew Point60°F
Est. Output80°F
Updated: Sep 26, 3:01 PM PDT
Palm Springs Airport
Outside Temp100°F
Dew Point49°F
Est. Output75°F
Updated: Sep 26, 2:53 PM PDT
Thermal Airport
Outside Temp101°F
Dew Point49°F
Est. Output76°F
Updated: Sep 26, 2:52 PM PDT
How to Read This
Score
0–100, based on the wet-bulb depression — how much cooler the air could get versus the actual outside temperature. Drier air means more room to cool, so a bigger gap scores higher.
Wet-Bulb Depression
The gap between the outside (dry-bulb) temperature and the wet-bulb temperature — the coolest evaporation alone could get the air. A bigger gap means drier air and more room for the cooler to work with.
Estimated(Est.) Output
The approximate temperature of the air coming out of the cooler, estimated by cooling the outside temperature most of the way toward the wet-bulb temperature.
Efficiency
These numbers assume 80% saturation efficiency — typical for a well-maintained direct (single-stage) evaporative cooler.
Lower dew point + higher temp = better cooling
(This guide generally will work for misting systems also)
