To keep our observation records as compact as possible, we use arrays to return observation values. Each device type has a different observation format. The array definitions for each device and event type are below.

Tempest Observation

Denoted in API responses with type obs_st.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1wind lull(m/s)
2wind average(m/s)
3wind gust(m/s)
4wind direction(degrees)
5wind sample interval(seconds)
6pressure(mb)
7air temperature(°C)
8relative humidity(%)
9illuminance(lux)
10uv(index)
11solar radiation(W/m²)
12rain accumulationrain accumulation during the reporting interval (mm)
13precipitation type0 = none, 1 = rain, 2 = hail, 3 = rain + hail (experimental)
14lightning average distance(km)
15lightning strike countnumber of strikes during the reporting interval
16battery(volts)
17reporting interval(minutes)
18local day rain accumulationmidnight to midnight rain accumulation in the station's timezone (mm)
19Nearcast rain accumulation(mm)
20local day Nearcast rain accumulationmidnight to midnight Nearcast rain accumulation in the station's timezone (mm)
21precipitation analysis type0 = none, 1 = Nearcast value with display on, 2 = Nearcast value with display off

Tempest Daily Observation

A summary of observation data collected from midnight to midnight in the station's local timezone. Denoted in API responses with type obs_st.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1average pressure(mb)
2highest pressure(mb)
3lowest pressure(mb)
4average temperature(°C)
5lowest temperature(°C)
6highest temperature(°C)
7average humidity(%)
8highest humidity(%)
9lowest humidity(%)
10average illuminance(lux)
11highest illuminance(lux)
12lowest illuminance(lux)
13average UV(index)
14highest UV(index)
15lowest UV(index)
16average solar radiation(W/m²)
17highest solar radiation(W/m²)
18lowest solar radiation(W/m²)
19average wind speed(m/s)
20wind gust(m/s)
21wind lull(m/s)
22average wind direction(degrees)
23wind sample interval(seconds)
24strike count
25average strike distance(km)
26record count
27battery(volts)
28local day rain accumulation(mm)
29local day Nearcast rain accumulation(mm)
30local day precipitation minutes(minutes)
31local day Nearcast precipitation minutes(minutes)
32precipitation type0 = none, 1 = rain, 2 = hail, 3 = rain + hail (experimental)
33precipitation analysis type0 = none, 1 = Nearcast value with display on, 2 = Nearcast value with display off

AIR Observation

Denoted in API responses with type obs_air.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1pressure(mb)
2air temperature(°C)
3relative humidity(%)
4lightning strike countnumber of strikes during the reporting interval
5lightning average distance(km)
6battery(volts)
7reporting interval(minutes)

AIR Daily Observation

A summary of observation data collected from midnight to midnight in the station's local timezone. Denoted in API responses with type obs_air.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1average pressure(mb)
2average temperature(°C)
3average humidity(%)
4strike count
5average strike distance(km)
6highest temperature(°C)
7lowest temperature(°C)
8highest pressure(mb)
9lowest pressure(mb)
10highest humidity(%)
11lowest humidity(%)
12record count
13battery(volts)

SKY Observation

Denoted in API responses with type obs_sky.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1illuminance(lux)
2uv(index)
3rain accumulationrain accumulation during the reporting interval (mm)
4wind lull(m/s)
5wind average(m/s)
6wind gust(m/s)
7wind direction(degrees)
8battery(volts)
9reporting interval(minutes)
10solar radiation(W/m²)
11local day rain accumulationmidnight to midnight rain accumulation in the station's timezone (mm)
12precipitation type0 = none, 1 = rain, 2 = hail, 3 = rain + hail (experimental)
13wind sample interval(seconds)
14Nearcast rain accumulationNearcastrain accumulation during the reporting interval (mm)
15local day Nearcast rain accumulationmidnight to midnight Nearcast rain accumulation in the station's timezone (mm)
16precipitation analysis type0 = none, 1 = Nearcast value with display on, 2 = Nearcast value with display off

SKY Daily Observation

A summary of observation data collected from midnight to midnight in the station's local timezone. Denoted in API responses with type obs_sky.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1average illuminance(lux)
2average UV(index)
3local day rain accumulation(mm)
4wind lull(m/s)
5average wind speed(m/s)
6wind gust(m/s)
7average wind direction(degrees)
8highest illuminance(lux)
9lowest illuminance(lux)
10highest UV(index)
11lowest UV(index)
12record count
13average solar radiation(W/m²)
14highest solar radiation(W/m²)
15lowest solar radiation(W/m²)
16battery(volts)
17local day Nearcast rain accumulation(mm)
18precipitation analysis type0 = none, 1 = Nearcast value with display on, 2 = Nearcast value with display off
19local day precipitation minutes(minutes)
20wind sample interval(seconds)
21precipitation type0 = none, 1 = rain, 2 = hail, 3 = rain + hail (experimental)
21local day Nearcast precipitation minutes(minutes)

Lightning Event

Denoted in API responses with type evt_strike.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1distance(km)
2energy

Rapid Wind

Denoted in API responses with type rapid_wind.

IndexParameterDescription
0timestampEpoch (seconds, UTC)
1wind speed(m/s)
2wind direction(degrees)