Graham McIntire
3ea2548114
NCEI ASOS 5-minute data client (Weather.NceiMetarClient): - fetch/3 pulls per-station monthly .dat files from NCEI C00418 - parse/1 decodes the fixed-width METAR format including precise T-group temperatures (T02110094 → 21.1/9.4°C) - metar_5min_observations table: schema-identical to surface_observations, separate table to avoid mixing cadences Weather.recent_surface_obs/3 prefers 5-min data when available, falls back to the hourly surface_observations table. Data URL: https://www.ncei.noaa.gov/data/automated-surface-observing-system-five-minute/access/YYYY/MM/asos-5min-KXXX-YYYYMM.dat Available back to 1996.
49 lines
1.9 KiB
Elixir
49 lines
1.9 KiB
Elixir
defmodule Microwaveprop.Weather.NceiMetarClientTest do
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use ExUnit.Case, async: true
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alias Microwaveprop.Weather.NceiMetarClient
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@sample_line "03927KDFW DFW20260301000010303/01/26 00:00:31 5-MIN KDFW 010600Z 17012KT 10SM CLR 21/09 A2997 560 47 1400 160/12 RMK AO2 T02110094"
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describe "parse/1" do
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test "parses a single KDFW observation" do
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[obs] = NceiMetarClient.parse(@sample_line)
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assert obs.icao == "KDFW"
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assert obs.observed_at == ~U[2026-03-01 00:00:00Z]
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# T02110094 → 21.1°C = 70.0°F, 9.4°C = 48.9°F
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assert_in_delta obs.temp_f, 70.0, 0.2
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assert_in_delta obs.dewpoint_f, 48.9, 0.2
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assert obs.wind_speed_kts == 12.0
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assert obs.wind_direction_deg == 170
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assert_in_delta obs.altimeter_setting, 29.97, 0.01
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assert obs.sky_condition == "CLR"
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end
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test "parses multiple lines" do
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text = """
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03927KDFW DFW20260301000010303/01/26 00:00:31 5-MIN KDFW 010600Z 17012KT 10SM CLR 21/09 A2997 560 47 1400 160/12 RMK AO2 T02110094
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03927KDFW DFW20260301000510303/01/26 00:05:31 5-MIN KDFW 010605Z 17012KT 10SM CLR 21/09 A2997 560 47 1400 160/12 RMK AO2 T02110094
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"""
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obs = NceiMetarClient.parse(text)
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assert length(obs) == 2
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assert Enum.at(obs, 0).observed_at == ~U[2026-03-01 00:00:00Z]
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assert Enum.at(obs, 1).observed_at == ~U[2026-03-01 00:05:00Z]
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end
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test "skips blank or too-short lines" do
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assert NceiMetarClient.parse("") == []
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assert NceiMetarClient.parse("short\n\n") == []
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end
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test "handles negative temperatures via M prefix" do
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line = "03927KDFW DFW20260115120010103/15/26 12:00:31 5-MIN KDFW 151200Z 36005KT 10SM CLR M02/M08 A3032 560 47 1400 360/05 RMK AO2"
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[obs] = NceiMetarClient.parse(line)
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# M02 = -2°C = 28.4°F, M08 = -8°C = 17.6°F
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assert_in_delta obs.temp_f, 28.4, 0.2
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assert_in_delta obs.dewpoint_f, 17.6, 0.2
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end
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end
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end
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