Weather!

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GOES-16 Loop of the Day 2017/06/15

Smoke plumes from fires in the hot Desert Southwest - Geocolor
http://rammb.cira.colostate.edu/ramsdis ... 0_fire.gif

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[b][color=#0000FF]Friday gave us the first-ever images of a Category 4 storm gathered by the high-resolution GOES-16 satellite, whose data are still preliminary and non-operational. Image credit: NOAA/CIRA/RAMMB.[/color][/b]

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Category 4 Fernanda Rips across the Northeast Pacific
Dr. Jeff Masters · July 15, 2017, 2:55 PM

<<Arriving on the scene only a week after Category 3 Hurricane Eugene, Fernanda is the Eastern Pacific’s second major hurricane of the year—a milestone that on average isn’t reached till the third week of August. Eugene was a fast intensifier, but also a fast weakener: its entire lifespan as a hurricane spanned less than 48 hours. In contrast, Fernanda won’t be taking its bows anytime soon.

Fernanda was at a very southery latitude of 11°N on Saturday morning, and its westward to west-northwestward track through Monday will keep it over very warm waters of 28 - 29°C--about 0.5°C above average. Wind shear will remain quite low (less than 10 knots), so the main question mark in Fernanda’s strength over the weekend is how quickly it will recover from the eyewall replacement cycle that was underway Saturday morning. The old eyewall with a diameter of 10 miles was collapsing, to be replaced by a new eyewall with a larger diameter of 30 miles. Once this process is complete, reintensification can occur, and it is possible that Fernanda could reach Category 5 status on Sunday.

By Monday afternoon, Fernanda will be on a gradual decline, as it moves over cooler waters and into a drier, more stable atmosphere. The weakening should be gradual, though, and it’s possible that Fernanda will be approaching the Hawaiian Islands as a tropical storm by the weekend of July 22 - 23.>>

[Ann]

Much of Europe has been sweltering under a heat wave for much of the summer of 2017. In Sweden, by contrast, it has been fairly cold. The top 2017 summer temperatures in Sweden (that is, in June, July and August 2017 up until August 25) was 28.0 ^oC. It hasn't been that cold in Sweden during the summer months since 1922, and the last time it was even colder was in 1862.

Ann

[saturno2]

Unusual weather.
After two days of the solar eclipse that we have just passed,
in my zone, at 3 am, there was a violent drop of temperature
of the air.
I do not know it has to do with the eclipse.

[Ann]

Unusual weather.
After two days of the solar eclipse that we have just passed,
in my zone, at 3 am, there was a violent drop of temperature
of the air.
I do not know it has to do with the eclipse.

No, I wouldn't think so. The eclipse is a very brief and localized event, and it shouldn't affect the state of the atmosphere.

Similarly, Hurricane Harvey that hit Texas and Louisiana just a few days after the eclipse, also should have nothing to do with the eclipse.

Where I live, there was also a relatively big drop in temperature just yesterday. When I got up at 2 a.m. (yes), the temperature outside was 21 C. When I left home at 4 a.m., to cycle to the local railway station to get to work, a sudden terrible downpour left me completely soaked. The rest of the day the temperature stayed at around 16 C.

Ann

[saturno2]

Unusual weather.
After two days of the solar eclipse that we have just passed,
in my zone, at 3 am, there was a violent drop of temperature
of the air.
I do not know it has to do with the eclipse.

No, I wouldn't think so. The eclipse is a very brief and localized event, and it shouldn't affect the state of the atmosphere.

Similarly, Hurricane Harvey that hit Texas and Louisiana just a few days after the eclipse, also should have nothing to do with the eclipse.

Where I live, there was also a relatively big drop in temperature just yesterday. When I got up at 2 a.m. (yes), the temperature outside was 21 C. When I left home at 4 a.m., to cycle to the local railway station to get to work, a sudden terrible downpour left me completely soaked. The rest of the day the temperature stayed at around 16 C.

Ann

Thanks, Ann, for your explanation.
But, you will agree with me, that this violent temperature drop
in your and my zones are not normal and it is an interesting
topic of investigation.

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[bystander]

Little brother Jose following in Irma's footsteps.
Harvey may have a little sister brewing in the Gulf.

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http://www.nhc.noaa.gov/

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[Ann]

Compared with what many Americans have suffered in the United States, I have no cause for complaint. Still...

Exactly one year ago, on September 13, 2016, the weather here in Malmö was absolutely glorious, 26^oC and sunny. People were out picnicking, barbecuing in the parks, sunbathing on the beach, swimming in the waters of the Strait of Öresund and cruising up and down the streets in their fine convertibles.

This year, after a cool and cloudy summer, we've had a pretty miserable September. Today's top temperature has been 14.3 degrees, and we've had 9 millimeters of rain (more is on the way), and pretty stiff winds, and the wind is picking up.

Yesteryear, I long for yesteryear...

Ann

[Chris Peterson]

Exactly one year ago, on September 13, 2016, the weather here in Malmö was absolutely glorious, 26^oC and sunny. People were out picnicking, barbecuing in the parks, sunbathing on the beach, swimming in the waters of the Strait of Öresund and cruising up and down the streets in their fine convertibles.

This year, after a cool and cloudy summer, we've had a pretty miserable September. Today's top temperature has been 14.3 degrees, and we've had 9 millimeters of rain (more is on the way), and pretty stiff winds, and the wind is picking up.

We have had an unusual summer, as well. After a miserable June with no rain and temperatures peaking at 26°C, making it too hot to do anything outside, things completely turned around on July 1 with the coming of the monsoon. For all of July and August, we had temperatures in the high teens, with a maximum of 21°C, and rain nearly every day- around 20 cm for the two months. Perfect weather, so much better than recent summers that were warmer and drier. This moderation has resulted in fantastic displays of wildflowers, many of which are still in bloom. Normally by now everything would have gone to seed and we'd probably have had a couple of frosts. But we haven't yet seen it drop below 4°C, and most nights it stays above 10°C.

[rstevenson]

... For all of July and August, we had temperatures in the high teens, with a maximum of 21°C, and rain nearly every day- around 20 cm for the two months. Perfect weather, so much better than recent summers that were warmer and drier. ...

Perfect weather!? Nova Scotia could always use a couple of new immigrants, if you like that kind of weather.

Rob

[Ann]

We have had an unusual summer, as well. After a miserable June with no rain and temperatures peaking at 26°C, making it too hot to do anything outside, things completely turned around on July 1 with the coming of the monsoon. For all of July and August, we had temperatures in the high teens, with a maximum of 21°C, and rain nearly every day- around 20 cm for the two months. Perfect weather, so much better than recent summers that were warmer and drier. This moderation has resulted in fantastic displays of wildflowers, many of which are still in bloom. Normally by now everything would have gone to seed and we'd probably have had a couple of frosts. But we haven't yet seen it drop below 4°C, and most nights it stays above 10°C.

Have you had 200 millimeters of rain over these last two months, Chris? That's a lot!

We have had about 50 millimeters of rain during these last two weeks, so if this keeps up, we will indeed get 200 millimeters of rain in two months. As it is, there are big puddles everywhere in Malmö after today's rain.

Ann

[Chris Peterson]

We have had an unusual summer, as well. After a miserable June with no rain and temperatures peaking at 26°C, making it too hot to do anything outside, things completely turned around on July 1 with the coming of the monsoon. For all of July and August, we had temperatures in the high teens, with a maximum of 21°C, and rain nearly every day- around 20 cm for the two months. Perfect weather, so much better than recent summers that were warmer and drier. This moderation has resulted in fantastic displays of wildflowers, many of which are still in bloom. Normally by now everything would have gone to seed and we'd probably have had a couple of frosts. But we haven't yet seen it drop below 4°C, and most nights it stays above 10°C.

Have you had 200 millimeters of rain over these last two months, Chris? That's a lot!

Yeah. It's what we get some years. Mostly it was typical monsoon conditions, meaning sunny mornings peaking at around 20°C in early afternoon followed by a few hours of rain, sometimes raining overnight. Most years we get a few heavy thunderstorms that dump a lot of water. This year we mostly got sustained gentle rain, but every day, which is how it added up (without much runoff). Our ponds are all full and our springs are springing.

[Chris Peterson]

... For all of July and August, we had temperatures in the high teens, with a maximum of 21°C, and rain nearly every day- around 20 cm for the two months. Perfect weather, so much better than recent summers that were warmer and drier. ...

Perfect weather!? Nova Scotia could always use a couple of new immigrants, if you like that kind of weather.

I do like that kind of weather. But it includes several features that might not apply in Nova Scotia- we almost never have a day without at least a few hours of sunshine, and we almost never have a night where you can't see the stars. And except for when it's raining, the humidity rarely exceeds 30%.

[neufer]

And except for when it's raining, the humidity rarely exceeds 30%.

You don't get dew in the early morning?

[Chris Peterson]

And except for when it's raining, the humidity rarely exceeds 30%.

You don't get dew in the early morning?

Almost never. The dew point is commonly 30°F below the air temperature. Dew will occasionally form on high emissivity surfaces, but not typically on dirt, grass, or leaves.

[rstevenson]

... For all of July and August, we had temperatures in the high teens, with a maximum of 21°C, and rain nearly every day- around 20 cm for the two months. Perfect weather, so much better than recent summers that were warmer and drier. ...

Perfect weather!? Nova Scotia could always use a couple of new immigrants, if you like that kind of weather.

I do like that kind of weather. But it includes several features that might not apply in Nova Scotia- we almost never have a day without at least a few hours of sunshine, and we almost never have a night where you can't see the stars. And except for when it's raining, the humidity rarely exceeds 30%.

If the humidity ever falls as low as that here, our eyelids start cracking. Cancel your moving plans.

For example, today we had fine sunny weather, with temperatures of 22 to 23°C in the afternoon. Humidity was 60% at noon, rising to 73% now, 6:00 pm, as the temperature begins to fall.

Rob

[Ann]

Click to view full size image

A man in Malmö running home with his pizza.
Photo: TT.

Once again Malmö has been hit by a sudden rainstorm that was not foreseen by the meteorologists. The same thing happened in 2014, but it was worse back then.

In Copenhagen, just across the Strait of Öresund from Malmö, two runners taking part in a marathon race were hit by lightning. The race was canceled.

Ann

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Irma Turns Caribbean Islands Brown
Earth Observatory Sept. 12, 2017

<<These natural-color images, captured by the Operational Land Imager (OLI) on the Landsat 8 satellite, show some of Irma’s effect on the British and U.S. Virgin Islands. The views were acquired on August 25 and September 10, 2017, before and after the storm passed. They are among the few relatively cloud-free satellite images of the area so far. The most obvious change is the widespread browning of the landscape. There are a number of possible reasons for this. Lush green tropical vegetation can be ripped away by a storm’s strong winds, leaving the satellite with a view of more bare ground. Also, salt spray whipped up by the hurricane can coat and desiccate leaves while they are still on the trees. Irma passed the northernmost Virgin Islands on the afternoon of September 6. At the time, Irma was a category 5 storm with maximum sustained winds of 185 miles (295 kilometers) per hour. According to news reports, the islands saw “significant devastation.”

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[rstevenson]

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Irma Turns Caribbean Islands Brown
Earth Observatory Sept. 12, 2017

<<These natural-color images, captured by the Operational Land Imager (OLI) on the Landsat 8 satellite, show some of Irma’s effect on the British and U.S. Virgin Islands. The views were acquired on August 25 and September 10, 2017, before and after the storm passed. They are among the few relatively cloud-free satellite images of the area so far. The most obvious change is the widespread browning of the landscape. There are a number of possible reasons for this. Lush green tropical vegetation can be ripped away by a storm’s strong winds, leaving the satellite with a view of more bare ground. Also, salt spray whipped up by the hurricane can coat and desiccate leaves while they are still on the trees. Irma passed the northernmost Virgin Islands on the afternoon of September 6. At the time, Irma was a category 5 storm with maximum sustained winds of 185 miles (295 kilometers) per hour. According to news reports, the islands saw “significant devastation.”

Looks like the sea changed colour too! But both images are described as "natural-color". What could account for that very different sea colour between the images? Or more to the point, what accounts for the purple sea in the first image?

Rob

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Looks like the sea changed colour too! But both images are described as "natural-color". What could account for that very different sea colour between the images?

<<Differences in ocean color likely stem from differences in the ocean surface; rougher surfaces scatter more light, and appear brighter and lighter.>>

[rstevenson]

Thanks Art.

Rob