mattmfm Posted July 8, 2012 Share Posted July 8, 2012 someone posted this last night there jimmyjohn1 7/7/2012 6:51 PM EDT The observer was not quite correct. The temperature is averaged over each minute. Then, the five-minute average temperature is calculated from the five one-minute averages. The five-minute average temperature is what's recorded. It's a little more complicated than this, but that sums it up. You can read about the weather algorithms in the ASOS User's Guide (go to page 11 for temperature/dew point) at http://www.nws.noaa....sos/aum-toc.pdf Before the National Weather Service used ASOS, I believe the minimum and maximum temperatures were from instantaneous temperatures, but I could be wrong. But in that case the previous record was measured incorrectly...and should be noted in the climate reports. Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 But in that case the previous record was measured incorrectly...and should be noted in the climate reports. I've already thrown out the 106's in my head. I don't believe them. Then again at least it wasn't so complicated. Link to comment Share on other sites More sharing options...
MN Transplant Posted July 8, 2012 Share Posted July 8, 2012 But in that case the previous record was measured incorrectly...and should be noted in the climate reports. Well, the question is whether a mercury thermometer would even allow a temporary 1 minute jump in temperature to be recorded. Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 Echo tops on that cell are already up near 50kft! Link to comment Share on other sites More sharing options...
Nikolai Posted July 8, 2012 Share Posted July 8, 2012 of course their method begs the question as to whether any home stations or people reading thermometers are correct with reported highs. not sure why it has to be so complicated but i guess it helps cancel out jet blasts. Only on a weather forum do people get outraged, confused, and excited by thermometers situated in arbitrary places that aren't even representative of where people live Link to comment Share on other sites More sharing options...
snowfan Posted July 8, 2012 Share Posted July 8, 2012 Nothing out there now other than the cell in between hg and cumberland. 50k ft tops on that cell? Link to comment Share on other sites More sharing options...
snowfan Posted July 8, 2012 Share Posted July 8, 2012 Echo tops on that cell are already up near 50kft! Saw that and thought I was reading it wrong on radar scope. Impressive. Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 New little cell going up west of the first one. Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 Echo tops on that cell are already up near 50kft! Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 surface and mucape both quite high now across immediate dc area. perhaps i was too pessimistic.shear a little on the low side but probably enough. Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 dc high of 101! Link to comment Share on other sites More sharing options...
WVclimo Posted July 8, 2012 Share Posted July 8, 2012 Booming thunder here with darkening skies. 91 degrees. Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 surface and mucape both quite high now across immediate dc area. perhaps i was too pessimistic.shear a little on the low side but probably enough. What's causing that relative minimum of CAPE to the west of the area? Dewpoints mixing out? Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 What's causing that relative minimum of CAPE to the west of the area? Dewpoints mixing out? probably something like that.. guess i should open weatherscope. new analysis has 5000 into DC! Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 probably something like that.. guess i should open weatherscope. new analysis has 5000 into DC! OMG derechooooooooo Link to comment Share on other sites More sharing options...
thunderman Posted July 8, 2012 Share Posted July 8, 2012 http://www.nssl.noaa.gov/wrf/SPC/refl_loop.html Link to comment Share on other sites More sharing options...
thunderman Posted July 8, 2012 Share Posted July 8, 2012 There is an INCREDIBLE amount of lightning coming out that cell a tad West of Hagerstown. Link to comment Share on other sites More sharing options...
MN Transplant Posted July 8, 2012 Share Posted July 8, 2012 dc high of 101! One of the great heat waves. Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 One of the great heat waves. yeah for sure. part of me believed we'd never get to those 1930 levels but we've basically done it. Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 Good amount of cells popping now. Looks like it might be a "fun" afternoon after all. Still think best will be south but we should get some good storms. @Joey/Thunderman - I'm seeing markers that say 70ish strikes in 20 minutes!!! Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 Interesting little comma shape of very favorable severe parameters Link to comment Share on other sites More sharing options...
WVclimo Posted July 8, 2012 Share Posted July 8, 2012 No wind at all with this cell. 5 mph. Moderate rain isn't really even knocking the temp down either. Lost 1 degree. Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 No wind at all with this cell. 5 mph. Moderate rain isn't really even knocking the temp down either. Lost 1 degree. Looks like winds are mainly on the backend right now. A bit RFDish. Link to comment Share on other sites More sharing options...
TUweathermanDD Posted July 8, 2012 Share Posted July 8, 2012 Looks like winds are mainly on the backend right now. A bit RFDish. yes see rear flank downdraftage Link to comment Share on other sites More sharing options...
Disc Posted July 8, 2012 Share Posted July 8, 2012 Have a good wind blowing generally out of the NW right now. Home station reads 102/72, but with the wind blowing, it doesn't feel as stagnant and sticky. Link to comment Share on other sites More sharing options...
Ian Posted July 8, 2012 Share Posted July 8, 2012 yes see rear flank downdraftage should start going outflow dominant soon if it survives.. line behind might be the main deal eventually. Link to comment Share on other sites More sharing options...
Chase Posted July 8, 2012 Share Posted July 8, 2012 Watch is up for everyone north of Richmond to the M/D, excluding Cumberland. Until 10. Link to comment Share on other sites More sharing options...
thunderman Posted July 8, 2012 Share Posted July 8, 2012 Blue box going out for most the area Link to comment Share on other sites More sharing options...
Kmlwx Posted July 8, 2012 Share Posted July 8, 2012 should start going outflow dominant soon if it survives.. line behind might be the main deal eventually. Stuff will really be running into some juice. Link to comment Share on other sites More sharing options...
Ellinwood Posted July 8, 2012 Share Posted July 8, 2012 Current vis sat showing plenty of Cu ahead of the main developing line... environment is ready to go for some storms. Link to comment Share on other sites More sharing options...
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