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Weekend To Bring High Heat, High Surf In San Diego County

Beachgoers bask in the sun, July 3, 2018.
KPBS Staff
Beachgoers bask in the sun, July 3, 2018.
Weekend To Bring High Heat, High Surf In San Diego County
Weekend To Bring High Heat, High Surf In San Diego County GUEST: Alex Tardy, meteorologist, National Weather Service

>> I'm Allison St. John in for Maureen Cavanaugh. Our top story, it was an idyllic July 4. Sunshine and cool breezes but that is about to change. A heat wave is expected to slam into the county tomorrow and over the weekend. Here to tell us where we are at and what to expect this weekend and for the rest of the summer is National Weather Service meteorologist Alex. >> This is expected to pick tomorrow. What are we expecting? >> The warm temperatures, the hot weather they've been having is basically shifting West as we speak. >> We been hearing about it. Some record-breaking heat and we are going to see temperatures turn on like a switch tomorrow. We are going to see temperatures even in The Valley areas getting up over 105. On the immediate coast like San Diego and Oceanside probably getting up around 90. If you go in one or 2 miles it would be-- it will be 100. You mentioned Friday being the peak and that is the case. We have multiple things happening. High-pressure building over us, tropical cyclone Fabiano which is-- Fabiano which is offshore. >> We have double whammy going on. The highest temperatures look to be on Friday. Places like Ramona could see one to-- 110 112. >> Before the heat let's talk about the wind because people are always worried about wildfires. With the is one of the key ingredients. What will it look like? >> The wind is going to be quite light. We will have a weaker offshore flow going from the deserts to the ocean which is why it gets so hot. The light wind is going to be in our favor. What is and is the fuel, the vegetation. We saw what happened in early June with light wind. You can still get aggressive fires. Even though it is good that we are having light wind into the weekend I still think the fire danger is going to be quite elevated because of these excessively high temperatures. We will see humidity go up on Sunday. You will probably wake up Sunday and say it's muggy warm and stuffy. We will see humidity increase which is good for fires but because temperatures will be so high it is concerning because the fuel levels from the near record dry winters that we had. >> What is the record in Eastern parts of San Diego County so far for this time of year? >> I mentioned Ramona getting 110 on Friday and not much cooler on Saturday. We will see temperatures still get between 100 degrees and 110 including Escondido, Ramona, Alpine. In Ramona, the all-time high was 111. Ironically they hit that in June about one year ago. >> Is this likely to be the hottest it will be all summer? >> That's a great question because a lot of times we see peak heat waves in June or July because that's before we have more humidity. It's hard to get temperatures elevated with there's not much humidity. I would say we are probably in for another heat wave but will probably have a little more humidity. You don't get temperatures as high but it's more uncomfortable and more dangerous when you add the humidity component. Don't look for this to be the only one. >> What would you say is the temperature that people should really not be going outside? >> If you are not used to seeing 95 that's probably more of a threshold for you. Inland areas, if you have a soccer game, even if the humidity is just modest over 100 is starting to get critical. If you can avoid activities from 10:00 to four or 5 PM that's ideal. 105 no matter where you are becomes dangerous. >> We can we expect this to cool down? >> Relative cool down on Sunday. We will see more cloud cover and passing clouds. Sunsets and sunrises. Maybe even monsoon thunderstorms producing a little bit of rain in our mountains valleys and foothills. That is for Sunday and Monday. A gradual cooldown on Sunday but we are talking temperatures over 100. I think it is safe to say that Monday will be the day we are still sticky from humidity but not dealing with over 100 extremes. >> Looking for air-conditioner this weekend. >> What will be interesting is the overnight lows like Saturday and Sun day. They will be very mild so it's not just one day were you need to run it. >> Alex we will be talking again this summer.

High surf and extreme heat in San Diego could cause potentially dangerous conditions at the beach and throughout the region this weekend, according to the National Weather Service.

A high-pressure system was expected to strengthen Thursday and Friday and send temperatures soaring for the weekend, prompting the NWS to issue an excessive heat warning for San Diego County on Friday running from 10 a.m. to 9 p.m.

A map shows areas in San Diego with low to high heat risk, July 5, 2018.
National Weather Service
A map shows areas in San Diego with low to high heat risk, July 5, 2018.

Evening temperatures are expected to be in the mid-90s Thursday in inland San Diego County, spiking to 105 in Escondido and 108 in El Cajon on Friday. Ramona was expected to see weather as hot at 111 degrees Friday.

An increase in moisture will bring a slight chance of thunderstorms Friday afternoon through Saturday in some regions, the NWS predicted.

High surf from Tropical Storm Fabio, currently located about 850 miles southwest of the southern tip of Baja California, was expected to create strong rip currents and hazardous swimming conditions.

The NWS placed San Diego County beaches under a high surf advisory, which went into effect 6 p.m. Wednesday and lasts until 9 p.m. Friday.

Surf levels of 6-8 feet and as high as 10 feet will be possible in Orange and northern San Diego counties, forecasters said.

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