Is that a blue norther ?
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Pattern Hotober
- Thread starter NorthDFWwx
- Start date
LickWx
Member
We already did the inter hour high is 99 . Hoping for 100 !
^ Or maybe it already did? How does the temp fluctuate 3-4 degrees within a 30 minute span on a day like today?
Yep but looks like it keeps fluctuating between 97-99, even "cooled" to 96 atm so 100 still in play but may run out of time
Your thermometer is broke
ForsythSnow
Moderator
Yeah now that's cold. The highs are nice too.
LickWx
Member
If RDU has hit 99 then places like Fayetteville must have broken over 100? Where do y’all get to see the station temps ever 5 minutes best I can do is the hourly and then every 15 minutes the sky conditions but no temps
Webberweather53
Meteorologist
Go here for 5 minute obs:
To change between airports just put in their 4 letter ID. KCLT, KRDU, KFAY, etc.
https://www.wrh.noaa.gov/zoa/getobext.php?sid=kclt
How is it jumping around like that? Something seems weird. 95. 20 minutes later, spike up to 99. 15 minutes later, spike down to 96?
It's normal, you just never really pay that much attention to these incremental updates....
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Just seems to be the model error at this range. Several times last year this was the case. GFS likes to take that frontal line and move it vertical. Also it pushes those cold anoms too far south.
Webberweather53
Meteorologist
There's some inherent error in the instrument plus the occasional passing cloud &/or gust of wind which momentarily decreases insolation or raises ventilation near the sensor respectively, & depending on where the sensor is located at the airport, planes taking off or landing may significantly affect the sensor's reported temperature. Vertical mixing during a warm afternoon like this may also lead to temperature variations of a few degrees or so due to changes in the height of the mixed layer locally &/or winds.
And I also use the NWS Enhanced Data Display current obs map, it says experiential but from what I can tell has same info that Webb just shared
https://preview.weather.gov/edd/?la...=Meteorological_Observation&hvt=F&---=T&uwl=F
That's true. I don't. I guess I was allowing for the possibility of a degree, maybe two, deviation intra-hour. But 3-4 up and then back down just seems odd, especially since we're uniformly heating the air mass, which is being influenced by no weather features.It's normal you just never really pay that much attention to these incremental updates....
Maybe a plane rode by or they did some welding work right underneath the sensor.
Anyway, I've moved onto acceptance. Hopefully, all these shenanigans lead to 100, or I'm going to be really disappointed in the effort.
So, for you, this record will have an asterisk beside it, well besides the normal asterisk that records have....
KSPA has plateaued at 91. No increase for 2 hours
Carolina heat defies the laws of physics
Webberweather53
Meteorologist
In this afternoon's case, what I think is happening here is as the mixed layer deepens w/ the heating of the day, drier air is being drawn from aloft towards the surface. This leads to lower dewpoints and some evaporative cooling that cools the surface temperature at least temporarily and enough s.t. it's detected by the sensor.
When you couple the above w/ all of the other aforementioned sources of variability in the temperature plus the inherent error in the measurements actually being collected by the sensor (this temperature sensor usually consists of a platinum resistance thermistor which is itself imperfect and exhibits non-linear variations in conductivity wrt temperature), it's not too surprising to see variations of 2-3F like this.