Today's Top Weather Stories
On Weather & Climate Through the Eyes of Mark Vogan
BREAKING NEWS
Strong Line of Thunderstorms knocking on DC, Philadelphia and New York City's door!!
LIVE FEED...
-4.45pm ET: Philadelphia, PA now dropped to an incredible 70 degrees with the storms... and a stunning drop to just 71 degrees at Baltimore, MD... Remember it was 99 degrees less than 2 hrs ago!
-3.45PM ET: Central Park, New York in past 15-20 minutes has dropped a further 9 degrees with a current reading now at 72 degrees, with heavy rains and locally strong winds effecting Manhattan.
ALERT: SEVERE THUNDERSTORMS NOW EFFECTING THE PHILADELPHIA AREA, STAY SAFE BY TAKING SHELTER!
TWC: Severe Thunderstorm Warning for Philadelphia County, PA
-3.25PM ET: Central Park, New York currently experiencing heavy rains and a temperature down to 81 degrees.
-3.25PM ET: In the past 30 mins, Baltimore, Maryland has dropped from 99 to 96 degrees as clouds signal the approach of the front and associated thunderstorms!
-3.00PM ET: Both Williamsburg and Franklin, Virginia are sizzling at 108 degrees.
-3.00PM ET: Farmville, Virginia is at 106 degrees and with a dew point of 73 degrees, it feels-like 118 degrees.
-3.05PM ET: Atlantic City, NJ at 95 degrees, feels like 101 degrees, The Airport, slightly inland is 98 degrees and feels like 104 degrees.
-3.05PM ET: Millville, New Jersey remains at 94 degrees with sunshine, HI of 102 degrees.
-2.45PM ET: Scranton, Pennsylvania currently at 68 degrees with light rain.
-2.45PM ET: Lancaster, Pennsylvania currently 73 degrees with Thunderstorms.
-2.45pm ET: Philadelphia, Pennsylvania currently 90 degrees with Thunderstorms.
A seperation of Extremes between Hemisphere's
WHERE IT'S HOT, IT'S HISTORIC, WHERE IT'S COLD, IT'S HISTORIC
HISTORIC COLD SNAP FREEZES SOUTH AMERICA
Icecap.us
BRIEF RESPITE FROM EUROPE HEATWAVE
Refreshing Air from the North Atlantic and Northern UK reaches Germany but heat stands strong further east!
By Mark Vogan
The period between 6-14, July saw the hottest period from Manchester, London across to Amsterdam, Rotterdam, Paris, Berlin all the way south to Madrid and across southern Europe as an extremely dry May and June with even the stage being set all the way back through last winter had harnessed the development of an abnormally strong upper-level ridge over Germany and this has extended as far east as European Russia and as far west as the southern United Kingdom. Between the huge, sprawlling high centered over Germany and a strong, deep trough with an axis lined up between Reykjavik and Glasgow and a core centered inbetween, thus pushing influence of the trough this helped transport superheated air off the western Sahara. Those winds flow out of the southwest and cross very little water due to it's orientation, (across the far western Med Sea where waters are very warm and the narrow Gibraltar Strait which would have no cooling influence to the air mass. Coming from this direction, the Saharan air flowed across Spain, France, into Belgium the Netherlands, eastwards to Germany, helping increase, the already hot temps to between 95-105 degrees, The low countrues of Belgium, Holland and Denmark saw extreme heat as these winds crossed over 1,000 miles of already hot land (not water), allowing temperatures to climb into rare territory and within 5 to 6 degrees off the national heat record of 101 degrees. Gronigen in the north touched 94 degrees and Rotterdam in the south topped 95 degrees. It's likely some spots recorded 96 or even 97 degrees.
Today's 850mb geopotential chart (ECMWF model)
If you live anywhere from northern Spain to southern Scandinavia as well as across Germany you'll not need to be told that changes have indeed occured as temperatures have fallen some 10 to even 20 degrees or more off what we saw just 3 to 4 days ago. The major trough that dangled over Scotland and the northeast Atlantic over the past few weeks whilst Europe baked under a strong ridge has dropped southeast and had erased what had become persistent heat across western and central Europe throughout July.
Just back on July 19/20th London enjoyed a high of 85 degrees, on the 23rd the high was only 68 degrees, yesterday it was back to 78 as warmer air is trying to come in on the backside of the trough which is continueing to push cooler air into central Europe which has been so hot. Paris saw a high of 90 degrees on the 19/20th, only to drop to a high of 74 degrees the next day, illustrating well the strength of the incoming, southeast bound cold front. Instead of winds blowing straight from Algeria, they turned to a northwest direction, straight from Scotland!
SCOTLAND'S AIR NOW OVER AN AREA FROM AMSTERDAM TO BERLIN WHERE HIGHS FAILED TO REACH 70 DEGREES... BERLIN'S AIR NOW OVER MOSCOW WHERE THE HIGH REACHED 98 DEGREES YESTERDAY!!
On the 19/20th, Rotterdam went from a high of 88 degrees, some 20 degrees above normal to 70 degrees just two days later and down to a mere high of 69 degrees which is considered a normal high yesterday! Interestingly Glasgow whicvh has seen persistent 60s, persistent breezes and showers was warmer than Rotterdam with a high of 70 degrees, this is thanks to a flow of warmer air trying to draw in off the Atlantic on the backside of the trough, meaning the air which was over Scotland 48 hours ago has been shifted to the Netherlands and mainland Europe, as far east as Berlin where the front has now crossed over as highs in Berlin dropped from 90 degrees on the 21st, 87 degrees on the 22nd to a large drop of 70 degrees just a day later on the 23rd. That 17 degree drop illustrates the passing of the cold front and just yesterday, the high was a chilly 68 degrees as the actual cooler air being drawn across from Scotland enters the region. A difference in 32 degrees from the 100 recorded earlier in the month ...
A PROGRESSIVE PATTERN OVER THE PAST 7-10 DAY PERIOD ACROSS EUROPE
What's most interesting is that all the heat that was centered over Spain (upper 90s to low 100s), France (upper 90s) and up to Belgium, the Netherlands (low 90s) and southeast England (upper 80s), was then pushed east 4-7 days later to Germany and Poland (mid 90s to around 100), now the 90s to near 100 in Germany and Poland is now positioned over European Russia where Moscow saw highs the past 3 days between 95-98 degrees, whilst at the same time the air that was centered across Highland Scotland and northern England is now between Amsterdam and Berlin....
Perhaps the ridging trying to feed warmer air back into Britain may be the early signs of a heatwave that will progress and mature if it manages to continue nudging eastwards. 90s and 100s to return to western and central Europe 10-days from now??
850mb geopotential chart for Tuesday (ECMWF model)
IMAGE COURTESY OF THE BALTIMORE SUN
Northeast & Mid-Atlantic Newspaper Articles
The Virginian-Pilot
The Richmond Times-Dispatch
The Washington Post
The New York Times
A glimpse of New York heat of the past, when it was worse!!
New York Post
your america today forecast
by mark vogan
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Today's Weather across America
From AccuWeather
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AccuWeather
AccuWeather
AccuWeather
Weather Talk
By Mark Vogan
Pressures have intensified over Algeria and Morrocco today as the 32 degree isotherm has showed it's ugly head over Algeria and east Morrocco's desert. What does that mean? Hotter surface readings as the desert land has literally no moisture to divert the sun's attention to evaporation and not surface heating. On a typical July day the desert of interior Algeria, south of the Atlas mountains, temperatures usually climb to between 45-49C or 113-120 degrees. Today I wouldn't be surprised if somewhere in Algeria touched 50C or 122 degrees, perhaps even 125 or 128 which would be 52 to 53C. As you can see the 32C temp at 850mb covers a large section of the Arabian penninsula and this is regular during mid-summer. The regular fight for hottest surface temperatures on earth runs between Death Valley, CA, Algeria, Saudi Arabia and Iraq as well as some surrounding hot countries of the middle east.
For the Arabian penninsula, the problem with the Gulf coast areas is, temperatures even at the shore of Qatar can rise to 122 degrees and humidity levels can be as high as 85-90 degrees due to waters being as warm as the low to even mid-90s!! A relatively narrow body of water surrounded by arid desert which heats intensely to 115 or higher tends to heat those waters to the highest levels anywhere on the planet... Of course those downright hot waters, will release likewise the highest dew point temperatures on the planet and yes, you've guessed it.. the highest heat index values on the planet. Often Heat indexes along the coast can climb to unearthly levels as high as 140-160 degrees....
What's Reaching Today's Blogs?
Jesse Ferrell, AccuWeather
Today's US Extremes
Courtesy of AccuWeather
High: 125 degrees at Death Valley, CA
Low: 33 degrees at West Yellowstone, MT
Today's UK Extremes
Courtesy of the Met Office
High: 82 degrees at Writtle
Low: 48 degrees at Aboyne
Today's Extremes here at my house
High: 68 degrees
Low: 55 degrees
TODAY'S COND
Dry, mostly cloudy with a breeze blowing all day.
Thanks for reading.
-Mark
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