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On Weather & Climate Through the Eyes of Mark Vogan
Fall has arrived both by calender as well as look and feel across the American north
By Mark Vogan
As we have already entered a new month and particularly the month of October, it's becoming apparent that times are changing both in the upper-atmosphere and this is reflective on the ground in the form of cooler temperatures, windier conditions and even more unsettled weather also. Areas of low pressure that track west to east across the country spell rougher, cooler weather and often on the backside of these more "windy" storm systems come much colder air from Canada.
October is known as transition month, a month which sees the greatest drop in the average temperature and is often the month which brings the first flakes of snow as well as frost and freezing conditions. It's also the month which sees the wane of the fall colours which typically peak during September across the Rockies, Northern Plains and Midwest as well as New England, during October, those golden leaves get whipped off by crisp winds which blow down from Canada.
In between these more energetic and windier low pressure systems which whip those leaves and usher in cold winds and quite often snow to northern locations, cool Canadian high's often arrive more frequently and track further south as the heat of the tropics becomes less influencial, giving way to the expanding cold high's of the northern latitudes. Currently we have a rather expansive Canadian high that's parked over the Great Lakes and Wisconsin, providing both chilly days in which tomorrow may remain in the 40s across Northern Minnesota and Wisconsin as well as the UP of Michigan, whilst 50s are common for Minneapolis and Chicago. Night lows will fall away into the 30s in Minneapolis and low 40s for Chicago with 20s across the northern sections of these states as skies are clear and the air dry as well as the cool daytime highs which help set the base for cooler nights when days aren't as warm. The key now is the length of darkness at night, the colder air mass in place and the dry lower atmosphere which excellerates heat loss after sunset, moist air which tends to hold onto the heat.
There is also the increase in cloudiness and dull weather, rainy, deary days and as already stated, cool air, through lack of sunlight. It certainly becomes windier as those westerlies not only intensify as the air to the north grows colder and stronger but they migrate south, pulling lows further south also.
Interestingly, during situations like we're seeing currently on the US weather map, with the trough which is controlling the N. Plains and Great Lakes region and where the Canadian High is sending cold air southbound, further west over the Rockies, very warm air is propelling north from the Desert Southwest and bringing 80s all the way north into Montana, perhaps even Alberta and Saskatchewan, this is in response to a highly amplified pattern where the jet stream dives south to the east and northwards further west, bringing a seesaw of temperatures. This is fairly typical of October!
Storms wash out roads, prompt flash-flood watches
Los Angeles Times
Today's Weather across America
From AccuWeather
Widespread Frost to Grip Midwest Then Interior Northeast
By Meghan Evans, Meteorologist
More Wet Weather in Store for the Mid-Atlantic
By Katie Storbeck, Meteorologist
Western Storm to Wipe Out Warmth Early Next Week
By Meghan Evans, Meteorologist
Severe Vs. Dry Thunderstorms in the Southwest
By Meghan Evans, Meteorologist
Weather Talk
By Mark Vogan
Vagaries of the Weather
India & Sub-Continental Asia Weather
By Rajesh Kapadia
Saturday, October 02, 2010
According to "Vagaries" estimate;
As on Saturday, 2nd. October,The SWMosoon has retreated from all regions west of W.Bengal, North of the 20N line.
Monsoon still "on" in W.Bengal, NE States and states south of 20N including Mah.
Friday, October 01, 2010
Observing today's OLR and cloud motion vector maps, I would consider the monsoon having retreated from all places above 20N, westwards of W.Bengal and the north-eastern states.Meaning, Mah. not considered as monsoon free yet.
Both the maps are illustrative enough,and need no elaborations.
Will declare it accordingly tomorrow.
Vagaries had anticipitated this rise in day temperatures, about a week after the monsoon widhraws .
And look at the high day temperatures venturing from the west in the monsoon widhrawn regions. A 41c in Nawabshah,Pakistan, Karachi and many places there reaching 39c and otherwise a wide range of 38s.
In neighbouring India, Rajasthan, see the 38s now dominating the scene. And gradually showing 36 and 37 eastwards.The highest in India on friday was ,38c recorded at Jaisalmer and Bhuj.
Unlike the day temperatures which spreading the heat from the west, the nights gradual lowering will start from the north. I do not think we will have to wait too long for the nights to get pleasant.
The lowest temperature in the country on Friday was -4c at Darbuk, Ladhak. Places in H.P. like Kalpa and Keylong have started seeing minimum readings of a few notches above freezing.
Not too long before the drop is seen in Punjab and Haryana, the next in line southwards.
CHECK OUT OUR PARTNER'S BLOG BY CLICKING HERE FOR LOTS AND LOTS OF GREAT INFO, IMAGES RELATING TO THE WEATHER ACROSS INDIA AND THE SUB-CONTINENT.. I AM PROUD TO BE PARTNER'S IN BLOGGING WITH RAJESH KAPADIA!
What's Reaching Today's Blogs?
Flooding from Cape Hatteras to Montreal
The Valley Weather Blog
The Extremes of the Day
Today's US Extremes
Courtesy of AccuWeather
High: 104 degrees at Death Valley, CA
Low: 26 degrees at Embarrass, MN
Today's UK Extremes
Courtesy of the Met Office
High: 64 degrees at Exeter Airport (Devon)
Low: 35 degrees at Eskdalemuir (Dumfries and Galloway)
Today's Extremes here at my house
High: 56 degrees
Low: 42 degrees
TODAY'S COND
A fair start to the day under clear skies and light winds for the Central Belt but cloud and rain further north almost brought and north-south divide in the weather across Scotland. However, freshing southerly winds in the mid level's transported in the next batch of bad weather which has pockets of "very heavy rain" which produced yet more nasty surface water accumulation on roadways, slowing traffic and creating tough driving. I experienced this on the M8 heading into Glasgow as a cloud heading towards me (it was heading east as I headed west) and it didn't look omonous, but the rains it produced where torrential (see the facebook page for video I captured) and created very low visibility and dangerous surface water in a very short time frame.
Thanks for reading.
-Mark
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