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31 May 2013
I bought a new weatherstation (La Crosse Technology WS-2812U-IT) and had not taken the old thermometer down. The new sensor is attached to a fencepost 6' high in the back of my yard just under the first branches of a bank of pine trees. Its the only place that never gets sun. The old one was attached to the fencepost next to my house also 6' up near no vents or windows and got sun between late morning and just after noon. Its about 150' from the other one and both locations are on a gradual slope with neither being at the peak or hollow. Right away I noticed the following differences, not counting when the sun hit the old thermometer or that side of the house:
Sunny days - old thermometer was 2-5 degrees higher than new one
Cloudy/rainy days - old thermometer was never more than 2 degrees higher than new one, usually within 1 degree
Clear nights with wind - never more than a degree apart
Clear nights without wind - old thermometer 2-4 degrees higher
Cloudy/rainy nights - never more than a degree apart
I tested this by clipping the new thermometer right next to the old one and for four days the temps moved in lockstep, never differing by more than 0.2 degrees at any time, including daily max and min.
I am wondering if heat radiating from the house has anything to do with the differences, especially given the differences decreased in windy/rainy/cloudy weather. I also tested the old one in shade within 20 feet of the asphalt driveway and the sunny day difference was 4-9 degrees and the clear calm night difference was only 1-2. Makes you wonder just how accurate those airport thermometers next to paved runways, vents and small outbuildings are.
12 Dec 2007
I posted this is a reply to Kyle's topic, figured I may as well make it its own topic too.
As it seems almost a certainty according to what I've heard that something will be coming this weekend, I extend a challenge to pros and amateurs alike to take a guess on how much snow falls in my backyard. I am in Timonium, MD which is just north of the intersection of I-695 and I-83, north of Baltimore.
This area is notoriously difficult to forecast. Just last week, the local guys were giving anywhere to a dusting to an inch or two, Meteo-Madness Man Henry Margosuti stuck to a higher amount all along and nailed it. That was a clipper, they've done much worse with coastal events (see Jan. 25, 2000 for example!)
1. I will take the "official" measurements.
2. Measurements include any sleet/ice accumulation and will reflect a TOTAL amount.
3. If snow falls then rain melts it down the number I give will be the total amount that falls, not what lays on the ground at the end.
4. You can guess and revise as many times as you want until 12:01 AM Saturday morning. You get a Barry Bonds asterisk if your final guess comes in after that but before the storm begins.
5. I will post results at the conclusion of the storm.
8 Feb 2007
OK, I'm not a meteorologist but I can add and can tell when numbers don't "look right". I was looking at the NWS temperature records for BWI airport and saw the normals given for 1971-2000 and thought that they looked too low. I took the normals stated for 1971-2000 period ("normals" below) versus what each value for 1971-2000 given was summed and divided by 30 ("calculated" below):
January - Normals: 32.3 Calculated: 33.2 Difference: +0.9
April - Normals: 53.2 Calculated: 53.9 Difference: +0.7
July - Normals: 76.5 Calculated: 77.4 Difference: +0.9
October - Normals: 55.4 Calculated: 56.7 Difference: +1.3
I did not add each day of each month or take the decimal further out than the tenths' place (which was the data provided), but I doubt that would cause more than a few hundreths of a degree of difference, and would likely even out over a 30 year period. I am assuming the other 8 months have similar results, but didn't want to bother trying if someone in the know has an easy answer...
Why do these differ by a degree? And why are the normals provided always lower than what I calculated? Are these adjusted somehow when figuring out the 30-year norms?
You can add for yourself with the BWI-Marshall data
Maybe someone can let me know if they get the same results from their own local station's data?
(or is this a global warming conspiracy in purposefully understating "normal" temperatures by a full degree? haha!)
18 Jul 2005
...This has got to be it. Has anyone else seen "Tornado" (made 2004?) starring long-lost martial arts star Daniel Bernhardt? It was on Sci-Fi channel a few weeks ago. Apparently a gypsy-related curse was causing gigantic tornados in Romania which sometimes featured demonic faces. Another note - all the tornados shown spun clockwise in a northern hemisphere location. At least "Twister" didn't do that.
15 Oct 2013 - 21:52
14 Aug 2013 - 22:24
31 May 2013 - 15:11
31 May 2013 - 13:52
3 Oct 2012 - 10:35
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