Hi, just like I mentioned in the start, it will not be so easy to predict fog. In case of my location I had following conditions this morning between 5-6AM and no fog was visible. Just condensation on the cars etc.
Temperature between 6-7°C Humidity 97% no wind no solar radiation also difference between temperature and dew point was just 0,4°C Dne pátek 3. září 2021 v 13:51:16 UTC+2 uživatel mihec napsal: > I'm using Weather Display with one of my stations and use the built in > function to set the fog/haze conditions. It works very good. > Fog conditions: > * T < 10°C > * 95% >= humidity > * low wind or no wind > * solar radiation low > > Haze: > * T < 13°C > * 94% >= humidity > * low wind, low solar > > I might have slightly adapted humidity threshold, I don't remember. > > > sreda, 01. september 2021 ob 00:29:22 UTC+2 je oseba [email protected] > napisala: > >> In general, the possibility of fog developing is when the dewpoint spread >> is less then 5 degrees F. >> >> On Tuesday, August 31, 2021 at 6:02:58 PM UTC-4 [email protected] wrote: >> >>> * On 2021 31 Aug 14:35 -0500, František Slimařík wrote: >>> > >>> > Hi all, >>> > >>> > I got question for hardcore meteorologists here. Is it possible to >>> detect >>> > fog based on classic meassured values like temperature, humidity, >>> preasure, >>> > etc? >>> > Logically I would say fog appears when dew point equals current >>> > temeperature but I guess it will not be so easy. Fogs didn't appear >>> here >>> > this year in my locality so I am waiting for autumn to start with >>> > observations. >>> >>> I'm certainly no meteorologist! >>> >>> It seems we've had more foggy mornings this summer than in years past. >>> Humidity has certainly been high with only a handful of stretches with >>> more than a day below 50% relative humidity. >>> >>> Many times it seems as though warm air over cooler moist ground is >>> necessary for its formation. I don't think this is a temperature >>> inversion, as such, but they also seem to sometimes be quite localized >>> and are related to some interesting effects. >>> >>> I along with other radio amateurs and possibly Greg find the effects of >>> these weather phenomena on VHF and UHF radio propagation interesting. >>> >>> - Nate >>> >>> -- >>> "The optimist proclaims that we live in the best of all >>> possible worlds. The pessimist fears this is true." >>> Web: https://www.n0nb.us >>> Projects: https://github.com/N0NB >>> GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819 >>> >>> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/909cb30b-7281-4d27-99eb-59b0f3dfb41dn%40googlegroups.com.
