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Heat warning in L.A., Ventura counties extended another day

July 20, 2009 |  9:02 am

The high temperatures warning that was in effect over the weekend has been extended to today, with the thermometer reading expected to be in the triple digits for a third day in a row.

The warning covers mountain areas in L.A. and Ventura counties, with the exception of the Santa Monica Mountains range. Temperatures were expected to reach highs between 96 and 106 degrees during the day, with the possibility of some breezes in the afternoon, said Jamie Meier, a meteorologist with the National Weather Service in Oxnard.

Moist air being pushed into the area from the south will make it seem even hotter and more unbearable, she said.

“The little bit of humidity will make the heat that much more uncomfortable, and contribute to the dangerous nature,” Meier said.

There is also a slight chance of rain over the mountains and deserts this afternoon, with possible showers and thunderstorms, Meier said, adding that a high pressure system over the desert to the southeast of Los Angeles is working as a lid, keeping the hot air trapped and turning the region into a pressure cooker.

Coastal areas will be less affected by the heat due to the marine layer, but the high pressure will keep the cooler coastal air from moving inland, Meier said. While not record-breaking, temperatures have been higher than normal.

Average temperatures in the valleys for this time of year are usually in the low 90-degrees range, but weather officials said they were expecting triple-digit temperatures for the next seven days.

Although today had been expected to be the last day of the warning, Meier said the area will remain very hot with above-normal temperatures throughout the week. She cautioned residents to drink enough fluids, avoid exposure to the heat during the hottest parts of the day, and to never leave anyone unattended in a locked car even with the windows cracked.

-- Victoria Kim