Extreme Temperature Diary- July 7, 2018/ Hot Topic: Historic U.S. Heat Wave Day Ten

guyonclimate_mi5tor

Saturday July 7th… Dear Diary. The main purpose of this ongoing post will be to track United States extreme or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme or record temperatures as ETs (not extraterrestrials)😊. Here is today’s main climate change post related hot topic:

Historic U.S. Heatwave Day Ten

I have some very good news. Today should be the last day of a historic heat wave that has popped up from coast to coast from late June through early July. Also, while producing more records in the Southwest, today won’t be nearly as torrid in Southern California where all-time records were set yesterday. The combination of a bit more marine and monsoon moisture, and weakening of the heat dome should end extreme heat in Southern California, but it will remain dangerously hot due to higher heat index vakues. By Sunday we will see maximum temperatures that were very typical of a July day from the 1970s, the decade before global warming hit its stride:

This is not to write that the danger of seeing another heat wave are over. Far from it given that 500 millibar heights will remain high across the CONUS and that heat dome will strengthen again the next few days:

And now to the bad news. All-time record heat in Southern California aided conflagrations to explode last night. What is termed the Holiday Fire appears to be among the worst:

Holiday Fire Update – July 7, 12:30 am:50-80 acres and 10-20 structures burned; 2,200-2,500 people evacuated; 2,000 customers w/out power. Cathedral Oaks is closed between Carlo to Patterson.
12:53 AM – 7 Jul 2018
It appears after what we have seen since 2010 that, outside of the Gulf Coast and Florida due to hurricanes, California is the most susceptible U.S. state for the ravages of climate change.
Today I will concentrate on reports coming from the Los Angeles area, which is still being hit hard:

It is only 10:30AM, but temperatures have already far surpassed the daily record high of 100°. The temps may warm a few more degrees, possibly to 110° by the early afternoon before southerly winds pick up. Expect yet another day of 100° weather tomorrow.
10:36 AM – 7 Jul 2018

In the end, temperature in downtown Los Angeles went up to 42°C (108F) on Friday, and it reached an all-time high of 47°C (117F) in some western suburbs!

Setting new highs for the date (‘daily’) is not exceptional, but beating the old one by 10°C (18F, Van Nuys) is.

Record-breaking heat today – including daily records, a few for the month of July, and even a couple of all-time record highs. We will see a gradual cooling trend starting tomorrow.
10:18 PM – 6 Jul 2018

: Gov. Jerry Brown declares state of emergency in Santa Barbara County due to

11:28 AM – 7 Jul 2018

 Meteorologically this statistic off the Southern California coast was astounding:

Avalon had a min of 91F. SST’s appear to have been in the neighborhood of 18C/64F. RAP 13Z Forecast sounding did not capture the surface temperature well, but showed 100F at 1,500′ altitude! This mixed down, raising KAVX to 98F at 8 a.m. PDT. Astounding!

Historic heat wave in southern California where all-time heat records have toppled. Rapid attribution analysis finds climate change increased the chances of this event by about 20 to 50 times
12:24 PM – 7 Jul 2018

The 120 degree F temperature at Chino on July 6, 2018 may be the highest temperature ever recorded at an ASOS site (NWS, FAA, or DOD automated surface observing system) in the coastal or valley areas of Orange, Riverside, San Bernardino, and San Diego counties.
3:02 PM – 7 Jul 2018
As expected more records did fall today across Southern California, but a moderating “cooling” trend, if you can call it that, has set in:

Our record highs for today are all daily records – no all time highs. But increased humidity made it feel hotter in many places.

8:16 PM – 7 Jul 2018

Amidst the thunderstorms, we also broke some daily records today! Check out the list:

5:46 PM – 7 Jul 2018

(If you like these posts and my work please contribute via the PayPal widget, which has recently been added to this site. Thanks in advance for any support.)

The Climate Guy

Leave a Reply

Your email address will not be published. Required fields are marked *