Pasadena Forecast: 98° Today, 106° Friday

National Weather Service forecasters scrambled to revise their forecast early Thursday as Mother Nature dialed up the heat.

The revision reports that Independence Day will rise to 98°, Friday will blast up to 106°, and Saturday will hit 101°.

The San Gabriel Valley will be under a heat advisory until 6 p.m. Sunday.

The high temperatures and low humidity will also create an extended period of elevated to critical fire danger in areas away from the coast, forecasters said. 

Forecasters said humidity levels in those areas could drop as low as 6% to 12%, combining with the heat and potential winds gusting from 25 to 40 mph, dramatically raising the risk of rapid wildfire spread if flames erupt.

“A significant heatwave will affect the region this week and will continue through much of next week, with dangerously hot temperatures across much of the area,” according to the NWS. 

The heat was building thanks to a large upper high pressure system that moved in from the west. 

Temperatures will creep even higher on Thursday, and again on Friday, which is expected to be the warmest day of the heat wave.

“It is likely that there will be many high temperature records on Friday,” according to the NWS.

Forecasters said “only minimal cooling” is expected over the weekend, along increasing onshore flow should eventually cool things down along the coasts and slowly move into the valleys. But the high-pressure system is expected to persist, and the heat wave “may push deep into next week,” according to the NWS.

Authorities reminded the public to never leave pets or children inside vehicles on days that are even a little warmer than normal, as locked cars can turn into death traps in mere minutes.

Here is the updated and revised forecast for Pasadena from the National Weather Service as of 3:11 a.m. Thusday:

Independence Day: Sunny and hot, with a high near 98. Calm wind becoming west around 5 mph in the afternoon.

Tonight: Clear, with a low around 69. Southwest wind around 5 mph becoming north in the evening.

Friday: Sunny and hot, with a high near 106. North wind around 5 mph becoming southwest in the morning.

Friday Night: Clear, with a low around 71. Southwest wind around 5 mph becoming north after midnight.

Saturday: Sunny and hot, with a high near 101. North wind around 5 mph becoming calm.

Saturday Night: Clear, with a low around 68.

Sunday: Sunny, with a high near 95.

Sunday Night: Mostly clear, with a low around 65.

Monday: Sunny and hot, with a high near 96.

Monday Night: Mostly clear, with a low around 66.

Tuesday: Sunny and hot, with a high near 96.

Tuesday Night: Mostly clear, with a low around 68.

Wednesday: Sunny and hot, with a high near 97.