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ozone_aurora
27 July 2023 17:44:44
Some intense thunderstorms over NE Spain at the moment, which is nothing unusual, but also some intense thunderstorms over the Black Sea at the moment - is this unusual?
DEW
  • DEW
  • Advanced Member
27 July 2023 18:30:16

Some intense thunderstorms over NE Spain at the moment, which is nothing unusual, but also some intense thunderstorms over the Black Sea at the moment - is this unusual?

Originally Posted by: ozone_aurora 



The frequency is shown nicely in fig 4
https://www.vaisala.com/sites/default/files/documents/Lightning%20flash%20density%20in%20Europe%20on%20the%20basis%20of%2010%20years%20of%20ATDnet%20data_S.-E.%20Enno%20et%20al.pdf 

and the answer is that thunderstorms are frequent on the north side of the Black Sea, but I wouldn't know about the intensity.
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
+1
ozone_aurora
27 July 2023 19:16:50

The frequency is shown nicely in fig 4
https://www.vaisala.com/sites/default/files/documents/Lightning%20flash%20density%20in%20Europe%20on%20the%20basis%20of%2010%20years%20of%20ATDnet%20data_S.-E.%20Enno%20et%20al.pdf 

and the answer is that thunderstorms are frequent on the north side of the Black Sea, but I wouldn't know about the intensity.

Originally Posted by: DEW 


Cheers Dew! 👍
Quantum
03 August 2023 09:47:54
Not much media coverage on the South American heatwave which is bonkers because its occuring in midwinter. Some parts of central Chillie, Argentina and Uraguay have broken all time temperature records in Mid winter?!

I have to imagine the Foehn effect must be playing a pretty big role for this to happen.
 
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
+1
Jiries
05 August 2023 19:29:54
https://www.bbc.co.uk/news/av/world-europe-66418007 

Now that what a proper storm that brought deep cover hailstones.  A named storm for today really over reacting and just standard boring LP does nothing but rain and winds.
DEW
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06 August 2023 07:43:44
https://watchers.news/2023/07/25/new-european-hail-record-set-as-italy-witnesses-second-record-breaking-hailstone-in-less-than-a-week/ 

Just noticed this though from a couple of weeks ago.

The same site has a link to the more recent event of 8" of rain in Slovenia in 10 hours on Friday.
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
ozone_aurora
06 August 2023 10:13:02

Not much media coverage on the South American heatwave which is bonkers because its occuring in midwinter. Some parts of central Chillie, Argentina and Uraguay have broken all time temperature records in Mid winter?!

I have to imagine the Foehn effect must be playing a pretty big role for this to happen.
 

Originally Posted by: Quantum 


Very interesting.

Been following the weather or rather the forecasts for several cities in that part of the world. Cuiaba, of Mato Grosso, Brazil, is an interesting one.

In Winter, it is generally very hot, dry and sunny with max temps pretty much consistent, usually between 33 - 36 C for days on end, with mostly light N to NW winds. Its resembles one would experience in Madrid or Cairo in July and August.

However, just once every now and then, a cold blast sweeps across the region from the S Polar Regions, causing temperatures to tumble dramatically, sometimes the max temps falling right down into the teens, often with dull conditions and brisk S to SE winds, and maybe sporadic rain or showers (other times bone dry). Never lasts very long, in roughly 1 to 3 days time, temperatures climb back dramatically into low/mid or even high 30's, with prolonged drought and incessant sunshine lasting for say next 2 weeks to even for the rest of its winter.

The forecast for Cuiaba for next 5 days is very hot, dry and sunny with max of 39 - 40 C (source: BBC Weather). However, a max temperature of only 13 C was recorded there on 14 and 15 June 2023, with mostly cloudy conditions and occasional rain (source: www.timeanddate.com)
Jiries
06 August 2023 10:26:15

Very interesting.

Been following the weather or rather the forecasts for several cities in that part of the world. Cuiaba, of Mato Grosso, Brazil, is an interesting one.

In Winter, it is generally very hot, dry and sunny with max temps pretty much consistent, usually between 33 - 36 C for days on end, with mostly light N to NW winds. Its resembles one would experience in Madrid or Cairo in July and August.

However, just once every now and then, a cold blast sweeps across the region from the S Polar Regions, causing temperatures to tumble dramatically, sometimes the max temps falling right down into the teens, often with dull conditions and brisk S to SE winds, and maybe sporadic rain or showers (other times bone dry). Never lasts very long, in roughly 1 to 3 days time, temperatures climb back dramatically back into low/mid or even high 30's, with prolonged drought and incessant sunshine lasting for say next 2 weeks to even for the rest of its winter.

The forecast for Cuiaba for next 5 days is very hot, dry and sunny with max of 39 - 40 C (source: BBC Weather). However, a max temperature of only 13 C was recorded there on 14 and 15 June 2023, with mostly cloudy conditions and occasional rain (source: www.timeanddate.com)

Originally Posted by: ozone_aurora 



Similar set up for Namibia as they get 1 day very cold air per year I think. last year was 7C max in June with snowfall in nearby area but not over the waterhole which sit at 1000m because it was dry and overcast.  Last month it had dropped to 10C with some sporadic rain.  Normal winter temps are 20 to 25C there.
+1
scillydave
09 August 2023 21:27:52
Extraordinary devastation being reported from Maui in the Hawaiin Islands tonight.
Looks like wildfires have completcompletely destroyed the town of Lahaina which was home to 20,000 people.
Currently living at roughly 65m asl North of Cowbridge in the Vale of Glamorgan.

Formerly of, Birdlip, highest village in the Cotswolds and snow heaven in winter; Hawkinge in Kent - roof of the South downs and Isles of Scilly, paradise in the UK.
DEW
  • DEW
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10 August 2023 06:04:39
See also post in 'Hurricane Season' thread with links
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Tim A
10 August 2023 09:51:09
Mammoth Lakes finally closed its snow/skiing season this weekend.  Those absolutely incredible snowfall amounts this winter meant it could stay open despite the record heat in that region of the Country. 
Amazing to think you could ski in the morning and then do a 3 hour 30 drive to experience 54c at Death Valley. 
Tim
NW Leeds
187m asl

 My PWS 
DEW
  • DEW
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17 August 2023 06:18:48
Another day, another city [Yellowknife]
https://www.bbc.co.uk/news/world-us-canada-66526554 
Canada wildfire: Race to evacuate city as blaze approaches
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Essan
17 August 2023 07:24:04
Hot-tub-like Persian Gulf fuels 158-degree heat index in Iran

https://www.washingtonpost.com/weather/2023/08/09/iran-persian-gulf-extreme-heat/ 

Meanwhile, in the past week, Morocco and Turkey have both recorded 50c for the first time ever
Andy
Evesham, Worcs, Albion - 35m asl
Weather & Earth Science News 

Anyone who is capable of getting themselves made President should on no account be allowed to do the job - DNA
DEW
  • DEW
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17 August 2023 07:45:14
For the ignorant (like me)
The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature. This has important considerations for the human body's comfort. When the body gets too hot, it begins to perspire or sweat to cool itself off.

More details at 
https://www.weather.gov/ama/heatindex#:~:text=The%20heat%20index%2C%20also%20known,sweat%20to%20cool%20itself%20off 


 
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
+1
Jiries
17 August 2023 18:08:37
Some record broken in Cyyprus few days ago mainly the mountians copped all the heat and record high night time mimimums.  On Monday wwas 25.2 to 45.3C in Nicosia but no record broken as the highest for July was 45.6C.   Troodos saw amazing 29.5c minimum at night to 38.4C during the day, borh broke the records from 25.6C and 38.2C respectively.  The heatwave was supposed to carry on on Tue and yesterday but some clouds, high humidtity and west winds cut off but today went back to 41.5C.

At first I couldn't believe my eyes when i saw the apps showing all day rain in Death Valley this coming Sunday with max only 30C and 27C at night.  I checked on BBC forecast and same thing also so that a major storm in August?  I never seen Death Valley drop to 30C at day time in August. I think 37C was the lowest max.  I wonder if the E Nino are the cause for major all day rain event there instead of showers that normally hit and miss type.  Very interesting to observe the rain and how low the max be like in furnace August month, ,plus flash floods likely.
+2
GezM
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17 August 2023 22:41:12
Looks like Hurricane Hilary is the cause of the rain forecast for Death Valley as it moves north from Baja California. Not guaranteed though as the track of the storm could still deviate. 
Living in St Albans, Herts (116m asl)
Working at Luton Airport, Beds (160m asl)
Jiries
18 August 2023 06:45:12

Looks like Hurricane Hilary is the cause of the rain forecast for Death Valley as it moves north from Baja California. Not guaranteed though as the track of the storm could still deviate. 

Originally Posted by: GezM 



Look like a upgraded to prolonged the rain in Death Valley from 1 day to 3 days, with Saturday get some rain or thunder at 38% with all day rain on Sun and Monday with maxes of 28C and 31C respectively.  Very strange to hear a hurricane Hilary make a impact in California instead of typical Florida keys.  I am sure people and animals will be very blessed with a welcome break of cool and rainy weather.  
lanky
18 August 2023 07:29:52

Look like a upgraded to prolonged the rain in Death Valley from 1 day to 3 days, with Saturday get some rain or thunder at 38% with all day rain on Sun and Monday with maxes of 28C and 31C respectively.  Very strange to hear a hurricane Hilary make a impact in California instead of typical Florida keys.  I am sure people and animals will be very blessed with a welcome break of cool and rainy weather.  

Originally Posted by: Jiries 



I'm sure that they have a "Summer Monsoon" in the "desert" South West at this time of year on a fairly regular basis.

For those old enough to remember the original CSI series, they had episodes where it was pouring with rain in  Vegas
Martin
Richmond, Surrey
Jiries
18 August 2023 07:36:09

I'm sure that they have a "Summer Monsoon" in the "desert" South West at this time of year on a fairly regular basis.

For those old enough to remember the original CSI series, they had episodes where it was pouring with rain in  Vegas

Originally Posted by: lanky 



Yes it does happen in summer but normally in a form of showers or thunderstorms so temps still go to highs 30's or 40's.  I only see lowest 37C in August for Death Valley when it had rain showers and some clouds.  This time round seem very overcast and rainy all day to see such low maxes of 28C on Sunday, that 18C below average for 46C in Death Valley.  Very interesting to watch this weekend while here very boring dead summer continues.
doctormog
18 August 2023 07:43:25

I'm sure that they have a "Summer Monsoon" in the "desert" South West at this time of year on a fairly regular basis.

For those old enough to remember the original CSI series, they had episodes where it was pouring with rain in  Vegas

Originally Posted by: lanky 



The NOAA have an interesting article  about this from a couple of years ago.
Aberdeen
Current conditions (personal WS) 
ozone_aurora
18 August 2023 08:10:22

I'm sure that they have a "Summer Monsoon" in the "desert" South West at this time of year on a fairly regular basis.

For those old enough to remember the original CSI series, they had episodes where it was pouring with rain in  Vegas

Originally Posted by: lanky 


Yes, I remember Vegas having some spectacularly violent thunderstorms at this time of the year. I think it might have been on the front cover of National Geographic magazine, a few decades ago.
DEW
  • DEW
  • Advanced Member
18 August 2023 08:58:39
Kristen Corbosiero, who is now an associate professor of meteorology at the University at Albany, State University of New York, led a 2009 study that examined 35 Eastern Pacific tropical storms or hurricanes that brought significant rainfall to the southwestern United States from 1958 to 2003. These systems represented less than 10% of all of the Eastern Pacific’s named storms during that time, but they accounted for more than 20% of all the warm-season precipitation falling in southern California and northern Baja California. Of these 35 systems, only five affected the U.S. as early as Aug. 21, and most were in September, so the arrival of Hilary’s impacts on or around Monday would be an early outlier.

From https://yaleclimateconnections.org/2023/08/rapidly-intensifying-hurricane-hilary-heads-toward-southern-california/ 
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Jiries
18 August 2023 20:30:59
https://www.bbc.co.uk/news/world-us-canada-66499946 

Very interesting read and never had this major storm hitting California for over 80 years. so exciting observation for me to see how much rain and very cool maxes reached over Death Valley in August.  I been recording Death Valley since early 2000 and highest rain was over 1 inch but never several inches in a day so that storm might deliver it.
DEW
  • DEW
  • Advanced Member
18 August 2023 20:43:26

https://www.bbc.co.uk/news/world-us-canada-66499946 

Very interesting read and never had this major storm hitting California for over 80 years. so exciting observation for me to see how much rain and very cool maxes reached over Death Valley in August.  I been recording Death Valley since early 2000 and highest rain was over 1 inch but never several inches in a day so that storm might deliver it.

Originally Posted by: Jiries 



The National Blend of Models (NBM) is forecasting 3.79" of rain for Death Valley, California, over a 3-day period. None of the climate stations in Death Valley National Park have ever recorded even 50% of that amount in a 3-day period in over a century of records.

https://yaleclimateconnections.org/2023/08/californias-first-tropical-storm-watch-on-record-as-hurricane-hilary-heads-for-baja/ 
 
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Jiries
19 August 2023 05:07:18

The National Blend of Models (NBM) is forecasting 3.79" of rain for Death Valley, California, over a 3-day period. None of the climate stations in Death Valley National Park have ever recorded even 50% of that amount in a 3-day period in over a century of records.

https://yaleclimateconnections.org/2023/08/californias-first-tropical-storm-watch-on-record-as-hurricane-hilary-heads-for-baja/ 
 

Originally Posted by: DEW 



Most rain events always break up to light rain when entering valley regions even in winter then reform more as it move east.  Hilary storm are very strong and will penetrate the valley regions.  This morning app show 26C max and 100% rainfall risk.  Today max will drop to 38C with rain and thunderstorms arriving.  Exciting time and once in our life time event to see this. 

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