Dew Point 76 and Rising

greenlarry

17 years ago

Does high temp + high humidity = high dewpoint?

ptmcclanahan

17 years ago

greenlarry--yes it does.

80F dew point last night at 11pm when I got back in town. I'd hate to see what it was prior to that. Temp was 81 and 98% humidity.

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Warm air temps with freezing dew point.

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I don't know what you saw, Bon, because the Mesonet data linked shows the most current data, not what you saw at one point in time. Air temperature is just the measurement of the energy contained in the various gases that make up the air. I believe it is independent of dewpoint. Dewpoint is the temperature to which the air must be cooled in order to be fully moisture-saturated (100% relative humidity). You get precipitation (dew, rain, snow, whatever....or frost if the temperatures are low enough, in which case I guess the dew point really becomes the frost point) when the dew point and the air temperature are the same, or are very close to being the same. The closer the air temperature and the dewpoint are to the same number, the more likely it is that precipitation will form. So, if you were looking at data that showed a dewpoint of 31, that means that the air temperature would have to drop to 31 in order for precipitation to occur, technically speaking. If the air temperature were 50 or 70 or whatever while the dewpoint was 31, then the air is too warm for the air to achieve full saturation and it is too warm for precipitation to occur. The air temperature always is higher than the dewpoint, as far as I know, although perhaps a meteorologist could tell you of special circumstances where the dewpoint might get higher than the air temperatures. If that is possible, I've never heard of it occurring but weather and climate are complex. I watch my dewpoints on nights when air the temperatures might drop down below freezing or very close to freezing. Depending on what the dewpoint is, air temperatures in the mid- to upper 30s might be a little worth worrying about, or not at all. It just depends on what the dewpoint is at the same time. Dewpoints rise and fall throughout the day and don't remain static. Our local TV met usually mentions the dewpoint in his forecast discussions, indicting what they are and how they are going to influence whether we see frost or dew or rain overnight or nothing at all. Usually if the air temperature is going to fall close to the dewpoint at night and we also are going to be close to having freezing temperatures, he alerts gardeners to the fact that we will be seeing a situation that is potentially bad news for warm-season plants. It is all iffy, of course, so he usually words his warning to say something like "so, patchy frost might be possible" and if it is more likely in one part or another of the viewing area, he might say it is more likely further east or north or whatever. Or, if his concern is more with low-lying microclimates that tend to cool off more than the surrounding area, he'll even say that---usually by saying "so patchy frost might be possible in the usual colder, low-lying locations" and then folks, like me, who live in one of those usually colder, lower-lying locations know to be a bit more vigilant. Hope this helps. Dawn

andyandy
Original Author

17 years ago

I just checked agian, dew point steady at 76. It is now 88 and the humidity is 68%. I have freinds that live in Deerfield Beach Florida (about 10 mile north of Fort Lauderdale). It is cooler (barely) there with slightly less humidity (Barely). I can't imagine how relentless it is down there during the summer. We're just getting about a week of this. They have it for about 4-5 months. At least my freinds live about 1/2 mile from the water so at least they probably are getting an ocean breeze. There's not one ounce of breeze here. I hope it hits 100. At least that would help dry up all of the moisture from all the rain we've had. If it's going to hit 98 it may as well go all the way and hit 100. I do feel for the homeless and elderly with no air. I hope someone looks after them. I reset my air for 84 before I came to work. And to think I pay hundreds of dollars six months of the year just to keep my house at 70. Six months from now it could be 8 instead of 98

greenlarry

17 years ago

So its been hot and humid for a while. Today its been raining and the temps are lower. That should mean a lower dewpoint yet surely the rain will increase humidity!

ptmcclanahan

17 years ago

Found this on USAToday.com

Q: What's the highest dew point ever recorded?

A: The dew point temperature, which is based on how much water vapor is in the air, is a good measure of how humid it feels. A dew point above 70Â°F is quite humid. Very high dew points are often found near shallow, subtropical seas. Dhahran, Saudi Arabia, on the Persian Gulf, recorded a dew point of 95Â°F on July 8, 2003. In the USA, the highest dew points (above 80Â°F) occur near the Gulf of Mexico and in parts of the upper Mississippi Valley.

andyandy
Original Author

17 years ago

Cooler temps don't necassely mean a lower dewpoint. It's that 75 and a dew point of 75 doesn't feel as bad as 94 with a 75 dewpoint. Which by the way is where we're at now here in steamy Detroit

andyandy
Original Author

17 years ago

The hell with my palms, 95 with a 73 dew point is just flat out too muggy. Bring back 82 and pleasent. My palms may not grow as fast but they still grow. It was just TOO humid for it to ever hit 98 like they said. Only faling to 80 tonight.
That is unheard of around here.

chitown033

17 years ago

At one point earlier today it was 97F with a dew point of 80F... the heat index was 115F. It really didn't feel like it was that hot, but all the Chicago area stations were reporting similar numbers. Guess I'm used to this by now.

Kyle

ptmcclanahan

17 years ago

Look at the recorded dew point at 8:45 this evening...need say more?

dbrya1

17 years ago

Look at these heat index's at 10:15pm.

ptmcclanahan

17 years ago

Since when did Florida become the cool spot on the map? :-)

andyandy
Original Author

17 years ago

I know it's going to be a hot one when I wake up at 6:45 and it's 80 out already. Heading up to 100. One more hot one tomorrow and then it breaks. I hope our palms are sucking it up. This is the best weeks stretch mine have ever had. Current dew point 75 here.

andyandy
Original Author

17 years ago

That's a neat trick with the weather .com, how did you do that?

ptmcclanahan

17 years ago

Andy, use the following code and replace the part in quotes with the image source code you desire. You can find the image source code by right clicking on any image, then click "Properties" and then copy and paste the "address (URL)" text.

img src="http://image.weather.com/images/maps/current/acttemp_277x187.jpg";

The last thing needed is the brackets on the code above, just enter "" at the beginning and end, respectively.

andyandy
Original Author

17 years ago

""

ptmcclanahan

17 years ago

Close...you need the img scr= before the address and do no put " before or after the <. also the address needs to be an image ending in .jpg like mine above.>

blondboy47

17 years ago

Oh Oh! My palm tree just caught fire! LOL ;)

j/k

andyandy
Original Author

17 years ago

scr=http://www.weather.com/weather/local/48152?from=tenDay_topnav_undeclarednot as bad as yesterday, we topped out at 96. I was concerned I would see some leaf burn if we hit 100 but that was not a problem. The cool front moves in tonight but back to the high 80s by Friday. Without question going to be the best 2 week stretch ever for the palms. Come on August keep it up

tropicalintoronto

17 years ago

Toronto set a record for the highest low temperature yesterday. Last night's low was 27C/81F. This is the normal high temp not the morning low.

ptmcclanahan

17 years ago

With those kinds of temps you really are tropicalintoronto. :-)

Dew Point 76 and Rising

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