Alaska weather station data availability
Weather stations in Alaska play a crucial role in providing real-time information for decision-making, weather forecasting, and tracking long-term climate trends. Aviation weather observations, often sourced from airports, are among the most widely used and accessible data, including those found on weather apps. This project aims to evaluate the consistency of weather station data availability for Alaskan communities.
Key findings :
- Weather station data availability declined from 2015 to 2023
- Off-road weather station data has declined to critically low levels
- Sharp decline in National Weather Service data since 2015
From 2001 to 2023, 140 Alaska weather stations and over one million daily records were analyzed, with stations categorized as consistent or inconsistent using daily and yearly thresholds. Station coverage peaked between 2013 and 2015 but fell to a critically low 43 stations in 2023.
Weather station data availability declined from 2015 to 2023
Automated aviation weather observations began replacing contract observations in 1990 under the Federal Aviation Administration (FAA), while the National Weather Service (NWS) installed most of its automated stations between 1995 and 2000. In the 1990s, most Alaska stations still relied on routine support by a human observer, but this practice has steadily declined since the early 2000s. Today, only about 20 percent of automated aviation stations receive any human input, most of those for only part of the day, all managed by the FAA or its contractors.
Between 1995 and 2010, the aviation observation network expanded rapidly as the FAA, and to a lesser extent the NWS, added stations in previously unmonitored areas. Since 2010, new additions by the FAA have been minimal.
Alaska reached a peak of 74 weather stations providing consistent data in 2013, but the network declined sharply after 2015. By 2023, only 43 stations remained reliably reporting, the lowest count of the post-2000 automated era.
Off-road weather station data has declined to critically low levels
Stations located within 30 miles of a major highway were classified as part of the road system, while those beyond this range were considered off-road. Some stations, even though they can be accessed by road, such as on the north slope or southeast, were considered off-road because maintenance occurs through aviation.
This analysis shows a disparity between road and off-road station availability:
Road linked weather stations areas maintain more consistent reporting compared to off-road stations. Stations near major highways experiencing fewer long-term outages. These stations are generally better maintained due to ease of access and their importance for aviation and public weather services.
Off-road stations show notably higher rates of underreporting. Many of these stations rely on periodic maintenance via air transport, making repairs and upgrades less frequent.
Weather stations in the most off-road areas are particularly vulnerable to prolonged downtime, often failing to report for weeks or months due to maintenance challenges and infrastructure limitations.
Declines were most apparent in off-road stations where the number of stations providing consistent data declined from 50 to only 19, a 62% decline, since 2015.
The decline in off-road weather station data availability poses risks to aviation, subsistence
travel, and community safety, as local decision-makers and travelers increasingly lack reliable
real-time weather information.
Sharp decline in National Weather Service data since 2015
Historically, NWS stations maintained a much higher percentage of operational weather stations
compared to FAA stations. Between 2010 and 2015, NWS station data availability peaked at
over 90%, meaning the vast majority of stations met completeness criteria. During the same
period, FAA station availability was significantly lower, peaking at only 40%.
Since 2015, NWS stations have experienced a sharp decline in data availability, with a growing
number failing to report consistently. In contrast, FAA stations have remained more consistent
though they have historically had lower overall availability,
As of 2024, the FAA operates nearly twice as many stations as the NWS (95 vs. 45). While FAA
stations now account for a larger share of the network, their placement is primarily tied to
aviation needs, which may limit coverage for non-aviation communities.
The reduction in NWS station reliability raises concerns about the long-term availability of
comprehensive weather and climate data, particularly for communities not directly served by
aviation infrastructure.
Methodology
Weather station data was sourced from the Iowa State University Mesonet, with over 2 million
daily records between 1990 and 2023 collected from 190 stations for analysis. In the analysis
report above only FAA and NWS stations were included due to the inconsistent reporting of
Department of Defense and contract stations. The analysis above begins in 2001 to capture the
automated era of station reporting. Weather stations track various atmospheric variables, but
for this analysis, temperature, the most consistently reported metric, was used as the metric for
valid observations.
To assess station availability, thresholds were set at both daily and yearly levels:
- A station was considered consistent for a given day if it recorded at least 18 out of 24 hourly observations.
- A station was considered consistent for a given year if it had at least 353 days of complete data.
- Years where a station came online mid-year were excluded from the analysis to ensure consistency.