wimblettben
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Posts posted by wimblettben
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It is very dark here at the moment and is raining moderately.
I suspect that it won't get as bad as other places have had it though.
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There would certainly be a difference, I don't have a weather station but I would hazzard a guess that most people who do find it very difficult to get an ideal exposure for the anemometer and rain gauge. Much will depend on the exposure of your anemometer in relation to the surrondings. I assume it's not stuck near the Ash tree.
No, it's a hundred yards away from it actually. So it probably wouldn't have much effect on the weather station.
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Not strictly true. It certainly gets windier the higher you go, as a general rule, but not gustier. Gustiness is a direct factor of the roughness of the terrain ( ie trees, buildings etc ) and is a measure of the highest wind speed over a short duration relative to the mean wind speed at the time. The gustiest places tend to be town and city centres where the character of the prevailing wind is completely altered by the configuration of streets and buildings.
In a city centre it's quite possible to have a mean wind speed of 15 mph and to record gusts of 40 mph whereas a mean speed of 15 mph on an open moor at, say, 400 mts a.s.l would produce gusts around 23 mph.
Assuming your anemometer at 21 feet is equally as exposed as the 70 ft Ash tree you'd expect the mean wind speed at the top of the Ash tree to be around 25% higher according to Met' Office guidance for the correction of wind speed readings to standard height.
However, if you anemometer is surrounded by other objects also around 21feet, or higher, but the Ash tree is considerably taller than any of the surrounding obstacles then the mean speed at the top of the tree could easily be 30 or 40% higher than that recorded by your anemometer.
How far away from your anemometer is the tree and in what direction?
The distance is around 100 yards and the Ash tree is to the SW of the weather station.
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Wind speeds are slower at the surface due to friction on the ground, as height increases there is less friction and so the wind speed will be stronger.
Land, trees, vegetation and buildings etc create friction near the surface, a reason why wind speeds are usually recorded stronger on the coasts and hills. Water has very little if any friction for the travelling wind and also at elevation on the hills and mountains the wind has encountered little friction.
Say for example last week I recorded gusts to 75mph on low ground and Great Dun Fell which is 848m ASL was recording gusts to 90mph+
Does this mean then that there would be a big difference in wind speeds from my 21ft high anomometer and the 70ft or more Ash tree by the river in the front garden?
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Depends where you live, S-SE'ly gales will be affecting areas to the west of the UK through the Irish Sea coastal areas.
Well the wind is probably the strongest it's been so far today now at 5:10PM.
It is just starting to pick up at the moment and if you are wondering I live in Wiltshire in the Southwest so because I am inland then tonight it will probably be the usual speed of 25-30mph in gusts so nothing too exciting.
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I ask this question because I have noticed that when on top of a hill the wind seems to be blowing much faster and also more constant compared to when I am on ground level or in the garden.
Also I have noticed that the wind readings on observation stations seems to be much higher compared to readings on my weather station. The anomometer is up at 21ft above the ground in the garden but according to the Met Office an anomometer should be at a standard height of at least 30ft. This would explain why the tops of 70ft Ash trees move a lot more in the wind compared to trees which are only 20ft up.
Basically I would just like some help on this matter because I am worrying that my wind gauge may be broken or inaccurate.
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Curent analysis shows the Depression @ 978mb deepeing to the SW.
It will be very windy up the west side of the country later this evening and overnight.
Gales affecting Southern Ireland now as the Low moves closer to land.
Does this mean that it is tonight when the strongest winds will be because so far today it has just been breezy.
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The sky around here at the moment looks quite unusual in that it looks very hazy and I am also certain that earlier I saw a a few of those Altocumulus Castellanus clouds around which sometimes can be a sign of thunder for later.
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Current conditions: Reporting later then usual today because of a lie in. Anyway currently it is gerogeous out there with lots of sunshine with not a cloud in the sky. Light to moderate Southerly winds and cool temperatures.
Nightime summary:
Min temp: 5.2C
Max wind: 9mph
Direction: SSE
Rain: 0.0mm
Max humidity: 93%
Pressure: 1012.2hpa-Falling Slowly
Tendency: Rain
Cloud types: Non
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Considering the Met Office have issued a weather watch for heavy rain in the Southwest next Monday then it would seem to me that sooner or later we will get our rain that we desperately need.
Looking back on my records it looks like I have only managed to recieve about 17mm of rain so far this month, which is shocking especially considering that this is in the Southwest where we are supposed to get large amounts of rainfall at this time of year!
Anyway the models show Atlantic based weather for next week and currently the future isn't looking good for cold or frosts into November. But of coarse this could change.
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Current conditions: It was cloudy for much of the day and is currently overcast. Still feels quite cold out there to me though!
Daytime summary:
Max temp: 15.9C
Max wind: 17mph
Direction: SW
Min humidity: 62%
Pressure: 1020.9hpa-Falling very slowly
Tendency: Rain
Cloud types: Stratus, Altostratus
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Current conditions: Chilly but not quite as cold as the last few day's with some scattered high to medium level cloud. Pressure seems to be falling now which means that a change is likely in the next 24hrs.
Nightime summary:
Max temp: 4.2C
Max wind: 4mph
Direction: Vairiable
Rain: 0.1mm
Max humidity: 99%
Pressure: 1024.6hpa-Falling slowly
Tendency: Cloudy
Cloud types: Scattered Cirrus, ocassional Altocumulus
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Current conditions: Well cold this evening and in fact it is a good degree colder now at this same time as it was last night when it was suppose to be cold. Today was mostly a dry and sunny day but there was more cloud around in the afternoon.
Daytime summary:
Max temp: 14.6C
Max wind: 13mph
Direction: Vairiable
Min humidity: 48%
Pressure: 1027.4hpa-Steady
Tendency: Sunny
Cloud types: Cirrus, scattered Cirrostratus
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I'll go for a much milder November this year.
7.0C
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Current conditions: A cold start but not as cold as I was expecting with only -0.7C being reached at the lowest. There is some medium level cloud around and only some small areas of white frost are visible on some roofs. Current temperature at 7:55AM is 0.8C.
Nightime summary:
Min temp: -0.7C
Max wind: 11mph
Direction: Vairiable
Rain: 1.6mm
Max humidity: 99%
Pressure: 1028.5hpa-Rising very slowly
Tendency: Sunny
Cloud types: Scattered Altostratus
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Very dissapointed here this mourning only finding the smallest pockets of frost you could think on roofs.
The lowest I got to was -0.7C but it is currently at 0.7C.
Looks like wimblettben, yes me, has yet again posted a pointless topic!!!!
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Time for bed for me now and I will be anxiously hoping that when I wake up I will see a frost outside my window.
Bit worried currently though as I have just checked my weather station and it shows a 13mph wind and a temperature only at 6.1C!
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Current Conditions: Cold right now and mostly clear after a sunshine and shower sort of day. We had a heavy hail shower in the afternoon but now I am hoping that the temperature at least gets to freezing tonight!
Daytime summary:
Max temp: 15.1C
Max wind: 25mph
Direction: NNW
Min humidity: 49%
Pressure: 1025.6hpa-Rising slowly
Tendency: Sunny
Cloud type: Ocassional cumulus, ocassional cumilonimbus
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Hope this breeze dies down at some point here otherwise I will start to worry as the temperature has actually risen to 6.2C when it was 6.0C earlier.
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Currently 6.0C here but I think this is because we have got a constant 9mph north to northwesterly breeze and because of there still being some clouds around.
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Tonight is supposed to be the coldest night of this cold blip and with some places expected to get below freezing, I thought a temperature watch was necessary.
The BBC are also saying a widespread frost in the countryside.
Post temperatures and frost sightings here please.
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Current conditions: Very cold out there currently with completely clear blue skies. There seems to even be some areas with a slight frost in the garden! Couldn't post last night because of being to busy.
Nightime summary:
Min temp: 1.2C
Max wind: 6mph
Direction: Vairiable
Rain: 5.6mm
Max humidity: 99%
Pressure: 1017.6hpa-Rising slowly
Tendency: Sunny
Cloud types: Non
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Going by the GEFS ensembles as far as I can see once this very small cold blip occours on Wednesday and Thursday then the chances of any further frosts is unlikely.
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Current conditions: Cold this mourning and completely different from last night in terms of wind speed and cloud cover. We have just this second though had a passing shower go over us.
Nightime summary:
Min temp: 4.0C
Max wind: 28mph
Direction: W
Rain: 1mm
Max humidity: 99%
Pressure: 1012hpa-Rising slowly
Tendency: Cloudy
Cloud types: Scattered Cumulus
24th October 2011 Weather & General Chat
in Weather reports
Posted
Max of 17.8C here.Sunshine and cloud for most of the day but in the evening dark clouds came in from the southwest and since then it has been raining moderate to heavy. It has been quite windy as well with southeasterly winds and a top gust of 28mph.