While we are enjoying peaceful pleasant weather in the Great Lakes Region on into New England copious amounts of rain are falling from tropical depression Imelda in eastern Texas. The hurricane season has reached its mid point and has now become active in both the Atlantic and Pacific.
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Tropical cyclones are like giant engines that use warm, moist air as fuel. That is why they form only over warm ocean waters near the equator. The warm, moist air over the ocean rises upward from near the surface. Because this air moves up and away from the surface, there is less air left near the surface. Another way to say the same thing is that the warm air rises, causing an area of lower air pressure below.
Air from surrounding areas with higher air pressure pushes in to the low pressure area. Then that “new” air becomes warm and moist and rises, too. As the warm air continues to rise, the surrounding air swirls in to take its place. As the warmed, moist air rises and cools off, the water in the air forms clouds. The whole system of clouds and wind spins and grows, fed by the ocean’s heat and water evaporating from the surface.
Storms that form north of the equator spin counterclockwise. Storms south of the equator spin clockwise. This difference is because of Earth’s rotation on its axis.
As the storm system rotates faster and faster, an eye forms in the center. It is very calm and clear in the eye, with very low air pressure. Higher pressure air from above flows down into the eye.
When the winds in the rotating storm reach 39 mph, the storm is called a “tropical storm.” And when the wind speeds reach 74 mph, the storm is officially a “tropical cyclone,” or hurricane.
Tropical cyclones usually weaken when they hit land, because they are no longer being “fed” by the energy from the warm ocean waters. However, they often move far inland, dumping many inches of rain and causing lots of wind damage before they die out completely.
We will continue our warmer than normal temps through the weekend. Dew points will begin to climb into the 60s Friday bringing in a moister airmass. There is a slight chance of rain for Friday afternoon and evening – the best chances will be Saturday night through Monday morning. Some areas could see over an inch of rain with this system – more on that tomorrow with my weekend forecast.
Over 40″ of rain in Texas. The flooding is worse than Harvey in areas. Those poor people.
That is crazy amount of water ..
The updated CPC’s long range guess is now out and their guess is for a warm fall season and for now no real signal for the winter season (it could go either way)
Slim
Well we all know who’s not going to like that. Should cut down on some of the spam for a while.
Awww . Haha
Not looking forward to the rising dew points this weekend. One would think the humid days should be over by now. Guess not. 🙁
Some of the forcast models are giving Holland to GR over 3 inches of rain Sunday ..That would be insane …Cant wait to see what September ends up in the rain dept for the month im sure we’ll above ….INDY
Grand Rapids now has had 9 days in a row of above average temperatures and today will be the 10th. Yesterday the H/L at Grand Rapids was 81/56. The over night low at GRR was 58, the low here at my house was 56. For today the average H/L is 72/51. The record high is 91 set in 1908 the record low is 36 set in 1979. The warmest minimum is 68 set in 1965 and the coldest maximum is 54 set in 1991. Last year the H/L was 79/58
Slim
Low 80’s no humidity ok this time of year just no 90’s I believe September 30th is the last day we average a 80* degree day in GR we are officially on the downward trend …INDY
The last day where the average high is 70 is September 24th by the 30th the average high is 67. September 30th is the day on average when we see the last 80° day. The range is from August 28th 1918 to November 1st 1950. Last year and in 2017 the last 80 day happened on October 9th
Slim
For anyone who uses the analog year theory I just read that one of the analog winters for this winter could be 2005/06 and it that is one then any cold and snow lovers will not like it. That winter had most of its snow in November 17.3” and December 28.9” and very little in January 9.6” and January’s mean temp was 33.2° and that was a departure of +8.8°
Slim
I hope the Bahamas are spared the rest of the season.
Looks to be another gorgeous evening for high school football tomorrow.
Good morning it’s another beautiful one temp is 57* degrees outside out at thee YARDofBRICKS NE of GR great sleeping weather looks like we could see some more major rain coming Saturday night into Sunday boy we have a lot of rain around here this Fall maybe it has kept them 90’s away that was once predicted for last week and this week lol….Have a great Thursday ..INDY
Huh? Where were 90’s predicted? Nice try with the spin.
There were no 90’s predicted for this week, but last week WOOD did have highs in the mid to upper 80’s for today..
Slim
Thanks for the truth, Slim.