Topic: Davis Vantage Pro2 Forcast

[1david6]

I Was Wondering If anyone knows how to get the forcast from the david vantage pro consone to VWS or my website. I See Some People have found a way to do that. Thanks for your help.

[SLOweather]

What software are you using? What's your website URL? We need more info so we can help you.

[Sigdigit]

Speaking of these messages, has anybody noticed these messages are often wrong, or grossly late?  It seems to be like asking a magic 8-ball questions!  My temperature went from 37 to 59 in a three hour period this morning, and it says "little temperature change".  What does it consider a lot of temperature change, molten lava falling down?

[SLOweather]

You need to understand that the Davis forecasting algorithms are based on readings and trends from a single point of reference, wherever the station is mounted. It has no other data from which to draw; no other stations, no forecast models, nothing.

The forecasts seem to include some implementation of the Zambretti Weather Forcaster. There was a discussion of this on the Midlands UK weather forum here.

Midlands member Beteljuice implemented the Zambretti Forecaster in Javascript, and you can try it here with your own local data.

The Zambretti algorithm doesn't require barometric trend, while the Davis console will tell you on power up that it needs 3 hours of data to make a forecast. That tells me that the Davis implementation is a little more sophisticated than the original Zambretti.

[SLOweather]

Speaking of these messages, has anybody noticed these messages are often wrong, or grossly late?  It seems to be like asking a magic 8-ball questions!  My temperature went from 37 to 59 in a three hour period this morning, and it says "little temperature change".  What does it consider a lot of temperature change, molten lava falling down?

Also, I don't think the Davis forecasts are supposed to be for temp change from night to day, but rather from day to day. What was the temp yesterday at that time, compared to today at the same time?

(The dirty little secret of weather forecasting is that you can achieve 70-75% accuracy in forecasting today by saying "same as yesterday". The challenge in forecasting is in predicting the changes.)

[WeatherBeacon]

Speaking of these messages, has anybody noticed these messages are often wrong, or grossly late?  It seems to be like asking a magic 8-ball questions!  My temperature went from 37 to 59 in a three hour period this morning, and it says "little temperature change".  What does it consider a lot of temperature change, molten lava falling down?

Also, I don't think the Davis forecasts are supposed to be for temp change from night to day, but rather from day to day. What was the temp yesterday at that time, compared to today at the same time?

(The dirty little secret of weather forecasting is that you can achieve 70-75% accuracy in forecasting today by saying "same as yesterday". The challenge in forecasting is in predicting the changes.)

This is also why, unless something like a front is expected to move through, a long term forecast (5-10 day) by the "big guys" (NWS, etc.) will often simply give the normal conditions expected for the current season (which, if you think about it, makes complete sense). Keep an eye on your 5-10 day NWS forecasts and you'll see what I mean. I'm not saying 5-10 forecasts turn out to be correct, but they are safe bets when fronts aren't expected.

But as SLO said, the Davis station doesn't give an hourly forecast; it doesn't even attempt to forecast highs and lows. Nevertheless, it is surpisingly accurate at forecasting weather changes associated with fronts.

What really amazes me is how accurate the professional forecasts can be. It's especially interesting in the winter when the NWS forecasts a winter storm over the Great Lakes by saying that a low will develop SE of the Rockies and intensify as it moves NE, and you look at the surface map and see nothing there or even west of there that looks like a low. But they're looking at the bigger picture, including convergences and divergences in the jet stream. Then sure enough, a low develops over OK and becomes a raging winter storm as it moves NE. Fascinating.

[Sigdigit]

It just seems that whatever algorithms are used do not take into account all available parameters, ie, if solar radiation drops down very low around midday and stays that way for hours, I would think something should generate a message, "cloudy, increasing cloudiness".  Also, it's been raining with the rain gauge actively measuring rainfall, yet the forecast remains "rain possible within 12-24 hours" or something like that.  Only once or twice did I ever see it say "rain continuing...." while it was actually raining.  It sure would be nice to be able to have your local PWS data uploaded to a weather site that crunches this data in combination with additional data unavailable to a PWS to generate a point forecast for an individual PWS.

[WeatherBeacon]

Perhaps you've already seen this post, but here's a list of the conditions and forecasts that the Davis Vantage Pro console might display in its ticker at the bottom.

    http://www.wxforum.net/index.php?topic=532.msg3694#msg3694

[SLOweather]

Perhaps you've already seen this post, but here's a list of the conditions and forecasts that the Davis Vantage Pro console might display in its ticker at the bottom.
    http://www.wxforum.net/index.php?topic=532.msg3694#msg3694

Thanks for posting that, Kevin! I remember posting that to the old VWS forum, and thought it was gone. I'd forgotten that I posted it to WD as well. Have to make it a sticky in the Davis are, I suppose.

[tinplate]

Here are the forecast texts along with the associated codes (the loop data from the console only sends the code).

[ForecastRules]
0=Mostly clear and cooler.
1=Mostly clear with little temperature change.
2=Mostly clear for 12 hours with little temperature change.
3=Mostly clear for 12 to 24 hours and cooler.
4=Mostly clear with little temperature change.
5=Partly cloudy and cooler.
6=Partly cloudy with little temperature change.
7=Partly cloudy with little temperature change.
8=Mostly clear and warmer.
9=Partly cloudy with little temperature change.
10=Partly cloudy with little temperature change.
11=Mostly clear with little temperature change.
12=Increasing clouds and warmer. Precipitation possible within 24 to 48 hours.
13=Partly cloudy with little temperature change.
14=Mostly clear with little temperature change.
15=Increasing clouds with little temperature change. Precipitation possible within 24 hours.
16=Mostly clear with little temperature change.
17=Partly cloudy with little temperature change.
18=Mostly clear with little temperature change.
19=Increasing clouds with little temperature change. Precipitation possible within 12 hours.
20=Mostly clear with little temperature change.
21=Partly cloudy with little temperature change.
22=Mostly clear with little temperature change.
23=Increasing clouds and warmer. Precipitation possible within 24 hours.
24=Mostly clear and warmer. Increasing winds.
25=Partly cloudy with little temperature change.
26=Mostly clear with little temperature change.
27=Increasing clouds and warmer. Precipitation possible within 12 hours. Increasing winds.
28=Mostly clear and warmer. Increasing winds.
29=Increasing clouds and warmer.
30=Partly cloudy with little temperature change.
31=Mostly clear with little temperature change.
32=Increasing clouds and warmer. Precipitation possible within 12 hours. Increasing winds.
33=Mostly clear and warmer. Increasing winds.
34=Increasing clouds and warmer.
35=Partly cloudy with little temperature change.
36=Mostly clear with little temperature change.
37=Increasing clouds and warmer. Precipitation possible within 12 hours. Increasing winds.
38=Partly cloudy with little temperature change.
39=Mostly clear with little temperature change.
40=Mostly clear and warmer. Precipitation possible within 48 hours.
41=Mostly clear and warmer.
42=Partly cloudy with little temperature change.
43=Mostly clear with little temperature change.
44=Increasing clouds with little temperature change. Precipitation possible within 24 to 48 hours.
45=Increasing clouds with little temperature change.
46=Partly cloudy with little temperature change.
47=Mostly clear with little temperature change.
48=Increasing clouds and warmer. Precipitation possible within 12 to 24 hours.
49=Partly cloudy with little temperature change.
50=Mostly clear with little temperature change.
51=Increasing clouds and warmer. Precipitation possible within 12 to 24 hours. Windy.
52=Partly cloudy with little temperature change.
53=Mostly clear with little temperature change.
54=Increasing clouds and warmer. Precipitation possible within 12 to 24 hours. Windy.
55=Partly cloudy with little temperature change.
56=Mostly clear with little temperature change.
57=Increasing clouds and warmer. Precipitation possible within 6 to 12 hours.
58=Partly cloudy with little temperature change.
59=Mostly clear with little temperature change.
60=Increasing clouds and warmer. Precipitation possible within 6 to 12 hours. Windy.
61=Partly cloudy with little temperature change.
62=Mostly clear with little temperature change.
63=Increasing clouds and warmer. Precipitation possible within 12 to 24 hours. Windy.
64=Partly cloudy with little temperature change.
65=Mostly clear with little temperature change.
66=Increasing clouds and warmer. Precipitation possible within 12 hours.
67=Partly cloudy with little temperature change.
68=Mostly clear with little temperature change.
69=Increasing clouds and warmer. Precipitation likley.
70=Clearing and cooler. Precipitation ending within 6 hours.
71=Partly cloudy with little temperature change.
72=Clearing and cooler. Precipitation ending within 6 hours.
73=Mostly clear with little temperature change.
74=Clearing and cooler. Precipitation ending within 6 hours.
75=Partly cloudy and cooler.
76=Partly cloudy with little temperature change.
77=Mostly clear and cooler.
78=Clearing and cooler. Precipitation ending within 6 hours.
79=Mostly clear with little temperature change.
80=Clearing and cooler. Precipitation ending within 6 hours.
81=Mostly clear and cooler.
82=Partly cloudy with little temperature change.
83=Mostly clear with little temperature change.
84=Increasing clouds with little temperature change. Precipitation possible within 24 hours.
85=Mostly cloudy and cooler. Precipitation continuing.
86=Partly cloudy with little temperature change.
87=Mostly clear with little temperature change.
88=Mostly cloudy and cooler. Precipitation likely.
89=Mostly cloudy with little temperature change. Precipitation continuing.
90=Mostly cloudy with little temperature change. Precipitation likely.
91=Partly cloudy with little temperature change.
92=Mostly clear with little temperature change.
93=Increasing clouds and cooler. Precipitation possible and windy within 6 hours.
94=Increasing clouds with little temperature change. Precipitation possible and windy within 6 hours.
95=Mostly cloudy and cooler. Precipitation continuing. Increasing winds.
96=Partly cloudy with little temperature change.
97=Mostly clear with little temperature change.
98=Mostly cloudy and cooler. Precipitation likely. Increasing winds.
99=Mostly cloudy with little temperature change. Precipitation continuing. Increasing winds.
100=Mostly cloudy with little temperature change. Precipitation likely. Increasing winds.
101=Partly cloudy with little temperature change.
102=Mostly clear with little temperature change.
103=Increasing clouds and cooler. Precipitation possible within 12 to 24 hours possible wind shift to the W NW or N.
104=Increasing clouds with little temperature change. Precipitation possible within 12 to 24 hours possible wind shift to the W NW or N.
105=Partly cloudy with little temperature change.
106=Mostly clear with little temperature change.
107=Increasing clouds and cooler. Precipitation possible within 6 hours possible wind shift to the W NW or N.
108=Increasing clouds with little temperature change. Precipitation possible within 6 hours possible wind shift to the W NW or N.
109=Mostly cloudy and cooler. Precipitation ending within 12 hours possible wind shift to the W NW or N.
110=Mostly cloudy and cooler. Possible wind shift to the W NW or N.
111=Mostly cloudy with little temperature change. Precipitation ending within 12 hours possible wind shift to the W NW or N.
112=Mostly cloudy with little temperature change. Possible wind shift to the W NW or N.
113=Mostly cloudy and cooler. Precipitation ending within 12 hours possible wind shift to the W NW or N.
114=Partly cloudy with little temperature change.
115=Mostly clear with little temperature change.
116=Mostly cloudy and cooler. Precipitation possible within 24 hours possible wind shift to the W NW or N.
117=Mostly cloudy with little temperature change. Precipitation ending within 12 hours possible wind shift to the W NW or N.
118=Mostly cloudy with little temperature change. Precipitation possible within 24 hours possible wind shift to the W NW or N.
119=Clearing cooler and windy. Precipitation ending within 6 hours.
120=Clearing cooler and windy.
121=Mostly cloudy and cooler. Precipitation ending within 6 hours. Windy with possible wind shift to the W NW or N.
122=Mostly cloudy and cooler. Windy with possible wind shift to the W NW or N.
123=Clearing cooler and windy.
124=Partly cloudy with little temperature change.
125=Mostly clear with little temperature change.
126=Mostly cloudy with little temperature change. Precipitation possible within 12 hours. Windy.
127=Partly cloudy with little temperature change.
128=Mostly clear with little temperature change.
129=Increasing clouds and cooler. Precipitation possible within 12 hours possibly heavy at times. Windy.
130=Mostly cloudy and cooler. Precipitation ending within 6 hours. Windy.
131=Partly cloudy with little temperature change.
132=Mostly clear with little temperature change.
133=Mostly cloudy and cooler. Precipitation possible within 12 hours. Windy.
134=Mostly cloudy and cooler. Precipitation ending in 12 to 24 hours.
135=Mostly cloudy and cooler.
136=Mostly cloudy and cooler. Precipitation continuing possible heavy at times. Windy.
137=Partly cloudy with little temperature change.
138=Mostly clear with little temperature change.
139=Mostly cloudy and cooler. Precipitation possible within 6 to 12 hours. Windy.
140=Mostly cloudy with little temperature change. Precipitation continuing possibly heavy at times. Windy.
141=Partly cloudy with little temperature change.
142=Mostly clear with little temperature change.
143=Mostly cloudy with little temperature change. Precipitation possible within 6 to 12 hours. Windy.
144=Partly cloudy with little temperature change.
145=Mostly clear with little temperature change.
146=Increasing clouds with little temperature change. Precipitation possible within 12 hours possibly heavy at times. Windy.
147=Mostly cloudy and cooler. Windy.
148=Mostly cloudy and cooler. Precipitation continuing possibly heavy at times. Windy.
149=Partly cloudy with little temperature change.
150=Mostly clear with little temperature change.
151=Mostly cloudy and cooler. Precipitation likely possibly heavy at times. Windy.
152=Mostly cloudy with little temperature change. Precipitation continuing possibly heavy at times. Windy.
153=Mostly cloudy with little temperature change. Precipitation likely possibly heavy at times. Windy.
154=Partly cloudy with little temperature change.
155=Mostly clear with little temperature change.
156=Increasing clouds and cooler. Precipitation possible within 6 hours. Windy.
157=Increasing clouds with little temperature change. Precipitation possible within 6 hours. Windy
158=Increasing clouds and cooler. Precipitation continuing. Windy with possible wind shift to the W NW or N.
159=Partly cloudy with little temperature change.
160=Mostly clear with little temperature change.
161=Mostly cloudy and cooler. Precipitation likely. Windy with possible wind shift to the W NW or N.
162=Mostly cloudy with little temperature change. Precipitation continuing. Windy with possible wind shift to the W NW or N.
163=Mostly cloudy with little temperature change. Precipitation likely. Windy with possible wind shift to the W NW or N.
164=Increasing clouds and cooler. Precipitation possible within 6 hours. Windy with possible wind shift to the W NW or N.
165=Partly cloudy with little temperature change.
166=Mostly clear with little temperature change.
167=Increasing clouds and cooler. Precipitation possible within 6 hours possible wind shift to the W NW or N.
168=Increasing clouds with little temperature change. Precipitation possible within 6 hours. Windy with possible wind shift to the W NW or N.
169=Increasing clouds with little temperature change. Precipitation possible within 6 hours possible wind shift to the W NW or N.
170=Partly cloudy with little temperature change.
171=Mostly clear with little temperature change.
172=Increasing clouds and cooler. Precipitation possible within 6 hours. Windy with possible wind shift to the W NW or N.
173=Increasing clouds with little temperature change. Precipitation possible within 6 hours. Windy with possible wind shift to the W NW or N.
174=Partly cloudy with little temperature change.
175=Mostly clear with little temperature change.
176=Increasing clouds and cooler. Precipitation possible within 12 to 24 hours. Windy with possible wind shift to the W NW or N.
177=Increasing clouds with little temperature change. Precipitation possible within 12 to 24 hours. Windy with possible wind shift to the W NW or N.
178=Mostly cloudy and cooler. Precipitation possibly heavy at times and ending within 12 hours. Windy with possible wind shift to the W NW or N.
179=Partly cloudy with little temperature change.
180=Mostly clear with little temperature change.
181=Mostly cloudy and cooler. Precipitation possible within 6 to 12 hours possibly heavy at times. Windy with possible wind shift to the W NW or N.
182=Mostly cloudy with little temperature change. Precipitation ending within 12 hours. Windy with possible wind shift to the W NW or N.
183=Mostly cloudy with little temperature change. Precipitation possible within 6 to 12 hours possibly heavy at times. Windy with possible wind shift to the W NW or N.
184=Mostly cloudy and cooler. Precipitation continuing.
185=Partly cloudy with little temperature change.
186=Mostly clear with little temperature change.
187=Mostly cloudy and cooler. Precipitation likely. Windy with possible wind shift to the W NW or N.
188=Mostly cloudy with little temperature change. Precipitation continuing.
189=Mostly cloudy with little temperature change. Precipitation likely.
190=Partly cloudy with little temperature change.
191=Mostly clear with little temperature change.
192=Mostly cloudy and cooler. Precipitation possible within 12 hours possibly heavy at times. Windy.
193=FORECAST REQUIRES 3 HOURS OF RECENT DATA
194=Mostly clear and cooler.
195=Mostly clear and cooler.
196=Mostly clear and cooler.
200=Unknown forecast rule.

[mmorris]

I got the forecast displayed on my computer it in the Alpha Numeric panel  Then click on the Parameter Forecast, you have to make the forecast box really long so you can read the text. The Jpg is vws1020.jpg for the web site. I hope this is what you are looking for??

I Was Wondering If anyone knows how to get the forcast from the david vantage pro consone to VWS or my website. I See Some People have found a way to do that. Thanks for your help.

[1david6]

What software are you using? What's your website URL? We need more info so we can help you.

I am Using Virtual Weather Station V14  my websit url is http://weather.1david6.com.  I Was Wondering If anyone knows how to get the forcast from the david vantage pro consone to VWS or my website. I See Some People have found a way to do that. I think it may be done with weather link software. but when i was talking with davis instruments over the phone he sed it can't be done yet i see that people have found a way to do it.

[SLOweather]

The forecast tag in VWS is ^vst138^. Insert that tag in your htx file where you want the forecast to appear and it should work.

Keep in mind that Davis will not support anything but their products (hardware and software), and VWS is not a Davis product.

[SLOweather]

Here are the forecast texts along with the associated codes (the loop data from the console only sends the code).
(deletia...)

Notice that no forecast mentions anything beyond 24 hours...

[1david6]

I got the forecast displayed on my computer it in the Alpha Numeric panel  Then click on the Parameter Forecast, you have to make the forecast box really long so you can read the text. The Jpg is vws1020.jpg for the web site. I hope this is what you are looking for??

I Was Wondering If anyone knows how to get the forcast from the david vantage pro consone to VWS or my website. I See Some People have found a way to do that. Thanks for your help.

Thanks For all your Help I Did Find Out How To Get The Forcast To Work. It Is A Tag In Virtual Weather Station that was not ther when I Had My Old Weather Station.

[1david6]

The forecast tag in VWS is ^vst138^. Insert that tag in your htx file where you want the forecast to appear and it should work.

Keep in mind that Davis will not support anything but their products (hardware and software), and VWS is not a Davis product.

Thank you I Did find this and was able to get it to work. Last Month I Switched over to the davis. I Had the Oregon Scientific weather station WMR968. It Worked Well Until It Was Hit By Lightning.   The Forecats tag was not listed in The VWS Program until i changed over the station. Again Thank you for all your help.