[weewx-user] Fog detection?

2021-08-31 Thread František Slimařík
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

Re: [weewx-user] Fog detection?

2021-08-31 Thread DR
I wonder what the official textbook answer might be, if there is one. I for one have seen pockets of fog over roads and in low lying areas where micro climate is very close to each other but clearly particulate or radiative cooling or something makes fog form and 40 feet away there isn't any

Re: [weewx-user] Fog detection?

2021-08-31 Thread Greg Troxel
František Slimařík writes: > 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

Fwd: [weewx-user] Fog detection?

2021-08-31 Thread VE4PER / Andy
per request Forwarded Message Subject:Re: [weewx-user] Fog detection? Date: Tue, 31 Aug 2021 15:26:46 -0500 From: VE4PER / Andy To: Greg Troxel I think the sensor is referred to as transmissometer; usually in pro unattended observer stations that is used a

Re: [weewx-user] Fog detection?

2021-08-31 Thread Doug Jenkins
I wonder if you take cloud base and the humidity values to determine if you have fog. If the cloud base is low and you have high humidity, then one could speculate that fog is imminent. Any meteorologists can weigh in? On Tue, Aug 31, 2021, 4:19 PM Greg Troxel wrote: > > František Slimařík w

Re: [weewx-user] Fog detection?

2021-08-31 Thread Nate Bargmann
* 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 curren

Re: [weewx-user] Fog detection?

2021-08-31 Thread storm...@gmail.com
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 n0...@n0nb.us wrote: > * On 2021 31 Aug 14:35 -0500, František Slimařík wrote: > > > > Hi all, > > > > I got question for hardcore meteorologists