Wild bitter cold temp variations last night

[N0BGS]

Coldest night I've had here since the installation of the VP2 in October 2012. -18.5 F (-28 C) Brrrrr.....

I don't doubt the reported low, but look at this chart:

12-17-13.png

Those plunges happened over a period of only one or two minutes, but do correspond with the wind becoming calm in both instances. Same thing with sudden warming. The wind starts blowing a bit again and the temp rises 10 degrees in one minute.

I live in a very low, marshy area between two fairly high hills so it's not unusual for my temps to be considerably colder than other higher areas only 5 miles away. But are these spikes believable? Have you ever seen such recordings at your own stations?

Comments welcome.

--Kurt

http://www.kpw3.com

[mcrossley]

That doesn't look right does it! Do the Cumulus graphs show the same sudden changes? What is also of note is that the changes aren't all of the same magnitude either, nor do the misplaced sections match up with the 'normal' curves.

Untitled-1.jpg

[steve]

That looks like a problem with the temperature sensor to me. Those sudden changes of 10 degrees don't look realistic.

[N0BGS]

@Mark: Yes, the Cumulus graphs showed the same thing during that time period. My Weather Underground site also shows it graphically and in the tabular data.

temp.png

I am inclined to believe this is what the VP2 is delivering to Cumulus.