Earth Changes
Heathrow Airport has asked airlines to cancel one in five flights between 16:00 and 18:00 BST. Airlines say other London flights could be delayed.
The roof of a house in Chelmsford collapsed after being struck by lightning overnight. No-one was hurt.
There are amber weather warnings for rain in place for most of England and Wales. There are also flood alerts.
Electrical surge
Heathrow said there was a strong likelihood of thunderstorms, lightning strikes and hail, which can significantly reduce capacity for take-offs and landing.
About 20 flights will be cancelled and passengers have been advised to check whether their flight will be operating before travelling to the airport.
Manchester Airport said an electrical surge caused by thunderstorms had caused some delays.
General duty manager Gary Brown said: "It impacted on some lifts and baggage systems but most systems are now back up and running. We'll wait to see what happens this afternoon when we're expecting thunder."
The potential for record lows and record cool highs extends all the way from the Northern Plains to the Gulf Coast.

A dramatic rise in killer attacks by dolphins on porpoises (shown) is baffling scientists in one of Britain's main breeding seas. The calm waters of Cardigan Bay have been turned red in recent weeks by bottlenose dolphins killing smaller porpoises during deadly clashes
Marine scientists are struggling to understand why the rare attacks have been on the rise - with three out of the four attacks proving fatal. Researchers at the Cardigan Bay Marine Wildlife Centre (CBMWC) said they have always known dolphins attack porpoises, but that the frequency of recent attacks is alarming.
Volunteers at CBMWC, in Ceredigion, West Wales, rescued a porpoise stranded on the beach in May after being chased by dolphins. Last month researchers witnessed three dolphins killing a porpoise - with another fatal attack a week later. Then last week three dolphins spent 20 minutes brutally attacking a porpoise close to the centre's research vessel.
The bottlenose dolphins repeatedly pounced on the porpoise, forcing it underwater then throwing it in the air close to the boat. 'One of the dolphins in particular was attacking the porpoise while the others joined in from time to time,' said researcher Milly Metcalfe. 'Although we were close by, they took no notice of us, intent on the attack.'
The National Weather Service says the low Thursday morning was 1 degree cooler than the low of 65 degrees set in 1886.
The weather service says Huntsville tied a record low for the date of 59 degrees set in 1945, and temperatures were in the mid- to upper 50s across north Alabama.
The unseasonably cool temperatures are supposed to continue during the day with highs expected below 90 degrees across the state.
Farmers in Rajouri district of Jammu and Kashmir were worried as their crops have suffered massive damaged due to the hailstorm.
Expressing their sorrow, farmers said that they invested huge amount of money for sowing high yielding vegetable seeds, but the hailstorm destroyed their entire fields.
"I had sown high breed seeds for which we spent 8-9,000. The moment the crops got ready, hailstorm destroyed them. This is my only source of income. I am dependent on it. It's been two weeks. Nobody from the administration (government) has come here. Therefore, we request them to come and see the damage and government should provide us some support," said a farmer, Shabbir Hussain.
Agriculture officer Rafiq Choudhary said that farmers must avail the benefit of number of schemes introduced by the provincial government for the growers who are faced with such problems due to natural calamity. "We can't help it. This destruction has been caused by nature. But it would have been better if they had avail 'Kisan (farmer) credit card' scheme and had got their crops insured on time, because then they wouldn't face this problem," said Choudhary.

Growing corn shorn from its stalks along Walker Road in the town of Sevastopol after a localized hailstorm ravaged crops Monday night.
Matt Stasiak, an agricultural researcher, tells the Door County Advocate the hail crushed cherry trees, grapevines, winter wheat, corn and other crops in Sevastopol on Monday night.
"A lot of foliage was stripped right off the cherry and apple trees," he said. "I saw some corn that had been ripped down to the stalks."
Stasiak also said five or six unfinished experiments at the Peninsular Agricultural Research Station were ruined. His team will have to wait until next year to repeat them.
A farmer tending to 60 acres of corn said the storm reduced the crop to one foot tall from four feet. The farmer said he remembers a similar hailstorm that hit the area 51 years ago, but it didn't leave behind "snowbanks" like the one on Monday night.

A plane drops fire retardant on the Chiwaukum Creek Fire near Leavenworth, Wash., Thursday, July 17, 2014. The blaze closed a section of U.S. Highway 2, and resulted in the evacuation of nearly 900 homes.
A small north-central Washington town and a nearby hospital threatened by a wind-whipped wildfire have been evacuated, and the blaze has burned at least 35 homes in Okanogan County, the sheriff said.
Sheriff Frank Rogers said late Thursday he's heard of no injuries from the Carlton Complex of wildfires.
The sheriff issued his highest evacuation notice Thursday for Pateros, a town of about 650 people along the Columbia River. Residents drove south to Chelan. A hospital in nearby Brewster was evacuated as a precaution, with the patients sent to Omak.
"The whole town was evacuated," Rogers said in a telephone interview as he drove the eight-mile stretch between Brewster and Pateros. "It was a chaotic mess but we got everybody on the highway."
"There's nobody in Pateros" except a few "stragglers" who stayed, he said, adding the fire was burning in the town, although the small business district was believed intact.
Rogers said perhaps 15-20 homes have burned in Pateros and another 20 homes in the Twisp-Winthrop area. He had no estimate of how many homes have burned in the entire county of about 40,000 people.
Two people in Florida have domestically-acquired chikungunya (chik-en-GUN-ye) infections, officials said Thursday. In both cases, they said, a person infected with the virus after visiting the Caribbean was then bitten again by an uninfected mosquito in Florida, which then transmitted the illness further.
Health officials urged residents to prevent mosquito bites, but said there was no cause for alarm.
"There is no broad risk to the health of the general public," said Dr. Celeste Philip, a public health official with the Department of Health.
Federal officials noted it's an unfortunate milestone in the spread of a painful infectious disease that has raced across the Caribbean this year and is apparently now taking root in the United States.
The NWS' Drought Monitor Update for July 15 shows 81% of California in the category of extreme drought or worse, up from 78%. Three months ago, it was 68%.
The map shows that drought conditions worsened in parts of Riverside, San Bernardino and San Diego counties.
The new data comes as officials are getting tough on water wasters.
Saying that it was time to increase conservation in the midst of one of the worst droughts in decades, the State Water Resources Control Board adopted drought regulations that give local agencies the authority to fine those who waste water up to $500 a day.













Comment: For more information on the electrical nature of the universe and the factors that are currently affecting the sun and the weather here on earth, read Pierre Lescaudron's new book, Earth Changes and the Human-Cosmic Connection.