Deck Pic Posted July 15, 2013 Share Posted July 15, 2013 Glad you posted that, JT. I noticed the PWS near my house had a DP of 79... I had to do a double take 79 is still on the upper range of the possibilities for a true reading but more likely it's near 73-76. There are really two main factors that can go into bogus dew point readings. A is that dew point is really the hardest measurement of the basic weather variables to make a accurate instrument for. B is that the weather station site greatly effects dew point on a day like this because of evapotranspiration, and if the station is too close to vegetation that that can throw the dew point off. My guess is that for most stations it's a bit of a and a bit of b. 74-75 max and probably lower.. Link to comment Share on other sites More sharing options...
mappy Posted July 15, 2013 Share Posted July 15, 2013 79 is still on the upper range of the possibilities for a true reading but more likely it's near 73-76. There are really two main factors that can go into bogus dew point readings. A is that dew point is really the hardest measurement of the basic weather variables to make a accurate instrument for. B is that the weather station site greatly effects dew point on a day like this because of evapotranspiration, and if the station is too close to vegetation that that can throw the dew point off. My guess is that for most stations it's a bit of a and a bit of b. Lucky for me and my station, roof's don't evapotranspirate and the fan on the radiation shield helps mitigate the "A" effect. Thanks for the explanation! Link to comment Share on other sites More sharing options...
H2O Posted July 15, 2013 Share Posted July 15, 2013 My PWS says 92/75 with a HI of 105 right now. Link to comment Share on other sites More sharing options...
Ian Posted July 15, 2013 Author Share Posted July 15, 2013 weak. we need 100 with HI 115+. Link to comment Share on other sites More sharing options...
Eskimo Joe Posted July 15, 2013 Share Posted July 15, 2013 Everyone freaks out over a warm day. I shutter to think what happens down here when it really hits the fan. Link to comment Share on other sites More sharing options...
snowfan Posted July 15, 2013 Share Posted July 15, 2013 It's really not that bad outside. I only wore my Marmot down vest. The full coat stayed in the closet. No gloves. Link to comment Share on other sites More sharing options...
yoda Posted July 15, 2013 Share Posted July 15, 2013 Everyone freaks out over a warm day. I shutter to think what happens down here when it really hits the fan. I think mid 100s are kind of the highest temps we would ever see around here i.e. 105 or 106. I don't think temps above that would be possible here, especially above 110. Link to comment Share on other sites More sharing options...
Ian Posted July 15, 2013 Author Share Posted July 15, 2013 Everyone freaks out over a warm day. I shutter to think what happens down here when it really hits the fan.You sleep thru the past three summers? Link to comment Share on other sites More sharing options...
Ian Posted July 15, 2013 Author Share Posted July 15, 2013 95 is solid. I take back the weak comment. Link to comment Share on other sites More sharing options...
MN Transplant Posted July 15, 2013 Share Posted July 15, 2013 First 90 of the year in Madison WI and we are stuck on the Tarmac while they check out the emergency slide. Seems like something that could have been done before they loaded us up. So excited to come back to heat and humidity. Link to comment Share on other sites More sharing options...
WEATHER53 Posted July 15, 2013 Share Posted July 15, 2013 I guess Oakland, Md finally hit 90 today? Link to comment Share on other sites More sharing options...
ravensrule Posted July 15, 2013 Share Posted July 15, 2013 I think mid 100s are kind of the highest temps we would ever see around here i.e. 105 or 106. I don't think temps above that would be possible here, especially above 110. 107 is the hottest temperature ever recorded in Baltimore. Link to comment Share on other sites More sharing options...
Mrs.J Posted July 15, 2013 Share Posted July 15, 2013 As of now 99/47 Index is 113. Dislike. Link to comment Share on other sites More sharing options...
wxmeddler Posted July 15, 2013 Share Posted July 15, 2013 I shutter to think what happens down here when it really hits the fan. Well, it gets accelerated and descends mixing out the lower, cooler air with the warmer air and thus overall actually gets cooler. Link to comment Share on other sites More sharing options...
ravensrule Posted July 15, 2013 Share Posted July 15, 2013 Well, it gets accelerated and descends mixing out the lower, cooler air with the warmer air and thus overall actually gets cooler. Link to comment Share on other sites More sharing options...
Bodhi Cove Posted July 15, 2013 Share Posted July 15, 2013 74-75 max and probably lower.. So the 77 dew at KMTN is incorrect because of reason A or B? I thought the dews were genuinely higher because of the proximity of the bay. Now I'm confuzzled... Please unconfuzzle me. Droid Bionic 4G LTE Link to comment Share on other sites More sharing options...
wxmeddler Posted July 15, 2013 Share Posted July 15, 2013 So the 77 dew at KMTN is incorrect because of reason A or B? I thought the dews were genuinely higher because of the proximity of the bay. Now I'm confuzzled... Please unconfuzzle me. Droid Bionic 4G LTE That is the exception. The air over the bay definitely does have higher dew points (79-84) with water temps now in the lower 80's with 100% humidity at nights and not much lower during the day. What we were talking about before was more inland areas. The original post I made touched on this fact when an easterly river breeze jumped my dew points and thus my heat indices. See the CIBIBS bay buoy site for bay weather info, though I find it rather silly that they give air Temp/RH/Pressure but not DP. edit: The dew point at Thomas Point lighthouse (10 mi SE of Annapolis) is 85°F Link to comment Share on other sites More sharing options...
Avdave Posted July 15, 2013 Share Posted July 15, 2013 It is just plain Hot out there. It sucks. Link to comment Share on other sites More sharing options...
yoda Posted July 15, 2013 Share Posted July 15, 2013 As of now 99/47 Index is 113. Dislike. 99/74 Link to comment Share on other sites More sharing options...
Bodhi Cove Posted July 15, 2013 Share Posted July 15, 2013 Thank you for the clarification wxmeddler. Droid Bionic 4G LTE Link to comment Share on other sites More sharing options...
Mrs.J Posted July 15, 2013 Share Posted July 15, 2013 My daughters have Gymnastics today. Currently sitting in an Industrial Park "tin box" Link to comment Share on other sites More sharing options...
BlizzardNole Posted July 16, 2013 Share Posted July 16, 2013 DCA was 85 at 8 pm yesterday; at 8 pm tonight it's still 92 -- tomorrow is going to be ugly! Sure it was a hot day, but the sky was clear, not hazy and the humidity was moderate. I think it gets bad starting tomorrow. My son's day camp is going to a Frederick Keys baseball game on Thursday. Link to comment Share on other sites More sharing options...
yoda Posted July 16, 2013 Share Posted July 16, 2013 HI 97 at 8pm... ouch 96 high temp at DCA... decent BWI 95 IAD 93 Link to comment Share on other sites More sharing options...
Ian Posted July 16, 2013 Author Share Posted July 16, 2013 50% DCA hits 100 in the stretch. 55% one of the local airports do. Link to comment Share on other sites More sharing options...
Avdave Posted July 16, 2013 Share Posted July 16, 2013 Heat Advisory up for DC and some parts near DC Link to comment Share on other sites More sharing options...
yoda Posted July 16, 2013 Share Posted July 16, 2013 90 at 9pm at DCA... I don't think it gets below 77 tonight at DCA Link to comment Share on other sites More sharing options...
Ian Posted July 16, 2013 Author Share Posted July 16, 2013 90 at 9pm at DCA... I don't think it gets below 77 tonight at DCAHopefully we get an 80+ low somewhere Link to comment Share on other sites More sharing options...
yoda Posted July 16, 2013 Share Posted July 16, 2013 Hopefully we get an 80+ low somewhere Prob won't be tonight... I could see Thurs morning or Friday morning as best shot IMO Link to comment Share on other sites More sharing options...
mattie g Posted July 16, 2013 Share Posted July 16, 2013 Wife and I took the little one and the dog for a walk at about 7:00. It really didn't seem that bad. Link to comment Share on other sites More sharing options...
H2O Posted July 16, 2013 Share Posted July 16, 2013 I just got back from my kids swim meet. I don't want to go outside again for at least 12 hours. Link to comment Share on other sites More sharing options...
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