Last night weather station Twente measured minus 4,1 Celsius. It has never been that cold in the Netherlands at this time of year, summer.

For the coming night night frost is expected, too.

Normally there is no night frost after the Ice Saints (May 11 -15).

Thanks to Argiris Diamantis, Hans Schreuder and JJM Gommers for these links

The Icelandic Marine Research Institute's annual spring expedition from May 18 to 30 concluded that the ocean temperature off Iceland has not been lower in 18 years, or since 1997. The number of krill is below average and not a single mackerel was caught.

"In the past years we have always caught some mackerel, and especially last year. But now we didn't see any," Guðmundur J. Óskarsson, one of the institution's specialists, who took part in the expedition, told Fréttablaðið.

Guðmundur stated that the ocean temperature from Southeast Iceland to the West Fjords has dropped by one to one-and-a-half degree Celsius. However, it can quickly increase if the air temperature increases substantially, he added.

Last month was the coldest May in Iceland in decades.

The expedition is part of the institute's long-term study of the condition of the ocean around Iceland, the vegetation, krill and fish which exist there. Samples were taken in 110 locations.

In a bizarre but beautiful sight the Red Centre turned white on Saturday following a thunderstorm which blanketed the area in a sheet of hail.

Photographs show a stunning contrast between the bright earth and hailstones covering the ground in parts of Alice Springs.

While the area does see storms it's not often conditions are just right to deliver the spectacle it did at the weekend.

'This event was set apart due to the fact it was a slow moving storm,' Jackson Browne, a meteorologist at the Darwin Bureau of Meteorology explained to Daily Mail Australia.

'Usually these storm cells move with quite a lot of pace,' he said, adding that although hail is present in most storms it has often melted by the time it meets the ground.

As the hailstones were only marble-sized they weren't large enough to cause any damage, but they did provide quite a sight for locals, many of whom have never seen hail despite living in the area for years.

Visitors to Denali National Park may get more than they bargained for today, as the National Weather Service has issued a winter weather advisory for the area.

The weather advisory went into effect at 6 p.m. Wednesday and was scheduled to last through noon today.

Snow topped the list of concerns precipitating the need for a weather advisory, according to meteorologists at the National Weather Service station in Fairbanks. Meteorologists estimate the park will receive 4 to 8 inches of snow.

The Weather Service estimates the snow will fall about 2,500 feet above sea level, which would leave the visitors center and much of the beginning of the park road clear of snow. A significant portion of the park road lies above 2,500 feet, however, as the road's elevation begins climbing early and rises significantly near Sable Pass.

Saturday night was a record cold night for both Twente and Eindhoven. But despite this brief bout of cold, warmer weather is expected for later this week.

Twente measured -2.2 degrees on Saturday night, the Gelderlander reports. The measurement was done at 10 centimeter height from the ground. According to the newspaper, the cold weather can partly be attributed to the cool sea air from the Northwest.

Eindhoven measured 0.2 degrees overnight on Saturday, also a record for this time of year. "For this time of year this is very exceptional", Dana Woei of Weerplaza said.

These cold records follow an extremely hot day on Friday, when temperatures reached above 30 degrees in some places in the Netherlands. Temperatures dropped again on Saturday, with some places not even reaching 20 degrees for maximum temperature.

The next few days are expected to be cloudy and cool, but the warm weather should return later this week, the Telegraaf reports. On Wednesday and Thursday temperatures are expected to rise to between 20 and 25 degrees, with an even warmer day on Friday. The weather will be cooler again over the weekend, with showers and thunderstorms expected.

In spring 2015, MBARI researchers discovered a large, previously unknown field of hydrothermal vents in the Gulf of California, about 150 kilometers (100 miles) east of La Paz, Mexico. Lying more than 3,800 meters (12,500 feet) below the surface, the Pescadero Basin vents are the deepest high-temperature hydrothermal vents ever observed in or around the Pacific Ocean. They are also the only vents in the Pacific known to emit superheated fluids rich in both carbonate minerals and hydrocarbons. The vents have been colonized by dense communities of tubeworms and other animals unlike any other known vent communities in the in the eastern Pacific.

Like another vent field in the Gulf that MBARI discovered in 2012, the Pescadero Basin vents were initially identified in high-resolution sonar data collected by an autonomous underwater vehicle (AUV). MBARI's yellow, torpedo-shaped seafloor-mapping AUV spent two days flying about 50 meters above the bottom of the Basin, using sound beams to map the depth and shape of the seafloor.

The AUV team, led by MBARI engineer David Caress, pored over the detailed bathymetric map they created from the AUV data and saw a number of mounds and spires rising up from the seafloor. Data from the AUV also showed slightly warmer water over some of the spires, which implied that they might be active hydrothermal-vent chimneys. A team of geologists led by David Clague then used a tethered underwater robot, the remotely operated vehicle (ROV) Doc Ricketts, to dive down to the seafloor, fly around the vents, and collect video and samples of rocks and hot water spewing from the chimneys.

Reflecting on the discovery, Clague commented, 'Before the AUV survey of Pescadero Basin, all we knew was that this area was really deep and filled with sediment. I was hoping to find a few outcrops of lava on the seafloor. But we got lucky. The vent field was right on the edge of our survey area, along a fault at the western edge of the basin.'

The AUV and ROV dives showed that the new field extends for at least 400 meters (one quarter mile) along this fault. Within this area the researchers found at least three active hydrothermal chimneys up to 12 meters (40 feet) tall, as well as dozens of low mounds that are most likely collapsed chimneys.

Parts of Europe are sizzling on Friday as an early-season heat wave sweeps across the continent. The heat is not particularly intense or dangerous, but it's pretty early the season for temperatures of this magnitude in northern Europe. Late-afternoon highs were surging into the low 90s, particularly in the Rhine River Valley in southwest Germany and eastern France.

Temperatures are steaming at as much as 25 degrees Fahrenheit above average for this time of year. Accuweather's Eric Leister says that some cities, including Paris, Amsterdam and Frankfurt, are seeing their hottest temperatures of the year thus far. The heat and humidity was fueling a line of showers and thunderstorms that's tracking east across northern Europe, with potential to impact the French Open on Friday evening.

The heat wave has likely reached its peak on Friday afternoon, though above-average temperatures will continue to spread south across Europe on Saturday into Sunday, but will regulate to highs closer to normal by early next week. Reuters reports that while the heat is making the tourists sweat in Paris, they don't necessarily mind the brilliant blue sky.

Temperatures hit 50C in United Arab Emirates as heat spreads across the Middle East

The highest daytime temperature in the world on Wednesday was recorded at Sweihan, Abu Dhabi, where the temperature climbed to 50.5C at 12pm local time.

The UAE has recently been enduring a heat wave, which started many thousands of kilometres away.

A week ago, while India was suffering an official heat wave, it was hotter still in the middle of Pakistan. In the Indus Valley, temperatures were daily at 48C and 49C.

Nawabshah, north of Hyderabad, registered at least 49C for four days in a row. May 24 saw the highest temperature of Pakistan's heat wave: 49.5C in Nawabshah.

This heat did not just go away, it has been blown gently south, through the Indus delta, over Gwadar, into the Arabian Sea. Indeed, as June came in, Gwadar's temperature shot up ten degrees to 48C for two days in a row.

This hot air, loaded with dust which is visible by satellite, has now reached Oman and the United Arab Emirates. Temperatures here have risen three to five degrees since the start of June.

On Wednesday, Khasab, Sunayah and Fahud, all in Oman, each measured 49C. This looks like a record-equalling high for Khasab, on the Musandam peninsula. This region is known as Oman's 'Norway of Arabia', with its fjord-like inlets and cliffs overlooking the Strait of Hormuz.

The UAE's heat wave also affected Ras al-Khaimah, recording two successive days at 47C, while Sharjah notched up 46C and the city of Dubai 45C.

With upper reaches receiving fresh snowfall, Kashmir, Thursday witnessed chilly conditions even as Meteorological department predicted light to moderate rains during next 24 hours.

"The areas above the height of 3000 meters above sea level have received fresh snowfall," the MeT officials said here. "Fresh chilly conditions are result of the fresh snowfall."

The chilly conditions forced the people Kashmir to wear more warm and woolen clothes. The plains, including Srinagar, were lashed by heavy rains.

The Met officials said that Srinagar recorded 6.0mm of rainfall, Pahalgam 9.4mm, Kupwara 10.1mm, Qazigund 14.7mm, Kokernag 15.6mm and Jammu 0.2.

Mountain passes and many other roads in the West Fjords, North Iceland and the East Fjords were subject to snowfall last night, causing snowy and slippery driving conditions. The Icelandic Met Office has forecasts sleet or rain in North and East Iceland today.

Travelers intending to drive Dynjandisheiði, Steingrímsfjarðarheiði and to Árneshreppur in the West Fjords should be aware of the winter conditions, ruv.is reports.

Parts of Siglufjarðarvegur in North Iceland are icy and there are icy and/or snowy conditions on the roads across Fjarðarheiði, Vatnsskarð eystra, Mjóifjörður, Möðrudalsöræfi, Vopnafjarðarheiði, Breiðdalsheiði and Öxi in East Iceland.

Due to repairs, parts of the road by Dettifoss waterfall in Northeast Iceland are only passable for 4x4 vehicles.

The weather is currently sunny in Reykjavík and South Iceland but conditions are expected to turn cloudy with some rain in the afternoon.