Observation and Event Definitions

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.

Index

Parameter

Description

0

timestamp

Epoch (seconds, UTC)

1

wind lull

(m/s)

2

wind average

(m/s)

3

wind gust

(m/s)

4

wind direction

(degrees)

5

wind sample interval

(seconds)

6

pressure

(mb)

7

air temperature

(°C)

8

relative humidity

(%)

9

illuminance

(lux)

10

uv

(index)

11

solar radiation

(W/m²)

12

rain accumulation

rain accumulation during the reporting interval (mm)

13

precipitation type

0 = none, 1 = rain, 2 = hail, 3 = rain + hail (experimental)

14

lightning average distance

(km)

15

lightning strike count

number of strikes during the reporting interval

16

battery

(volts)

17

reporting interval

(minutes)

18

local day rain accumulation

midnight to midnight rain accumulation in the station's timezone (mm)

19

Nearcast rain accumulation

(mm)

20

local day Nearcast rain accumulation

midnight to midnight Nearcast rain accumulation in the station's timezone (mm)

21

precipitation analysis type

0 = 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_ext.

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_ext.

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.

Index

Parameter

Description

0

timestamp

Epoch (seconds, UTC)

1

illuminance

(lux)

2

uv

(index)

3

rain accumulation

rain accumulation during the reporting interval (mm)

4

wind lull

(m/s)

5

wind average

(m/s)

6

wind gust

(m/s)

7

wind direction

(degrees)

8

battery

(volts)

9

reporting interval

(minutes)

10

solar radiation

(W/m²)

11

local day rain accumulation

midnight to midnight rain accumulation in the station's timezone (mm)

12

precipitation type

0 = none, 1 = rain, 2 = hail, 3 = rain + hail (experimental)

13

wind sample interval

(seconds)

14

Nearcast rain accumulation

Nearcast rain accumulation during the reporting interval (mm)

15

local day Nearcast rain accumulation

midnight to midnight Nearcast rain accumulation in the station's timezone (mm)

16

precipitation analysis type

0 = 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_ext.

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)