Extratropical cyclones north of 25°N are detected every 6 hours from NOAA CORe sea-level pressure (SLP) and 850-hPa winds, regridded to 1.25°. A cyclone centre is an 850-hPa vorticity maximum paired with a nearby SLP minimum south of 70°N, and a closed SLP minimum at and north of 70°N. Centres are linked into tracks, and tracks lasting at least 48 hours and travelling at least 1,000 km are retained. 

The map is updated daily, with a lag of about 2 days. Each month is tracked with 7 extra days on either side, and every storm present during the month is drawn over its full lifetime, so a storm crossing a month boundary appears in both months. In the first week of a month the map keeps showing the previous month, marked provisional, until data reach 7 days after its end; that month is then finalized and archived, and the new month is shown. 

Line colour shows the 6-hourly central pressure (hPa). Open circles mark the start, ringed circles the minimum pressure, and filled dots the end or latest position. Thick, labelled tracks are strong storms with a minimum central pressure of 970 hPa or lower, listed in the table. The lower panels zoom into the North Atlantic and North Pacific. Wind850 is the maximum 850-hPa wind sampled at the storm centre, not the 10-m wind. Times are UTC, and track IDs may change between updates.

Daily 2-m air temperature anomalies are shown for the Arctic (70–90°N), the Barents–Kara Sea (70–80°N, 30–70°E) and the Chukchi Sea (65–75°N, 160°E–140°W). Area-weighted means of NOAA CORe ensemble-mean daily 2-m temperature (1° grid) are compared with the 1991–2020 climatology for the same calendar day, smoothed with a 31-day running mean. No detrending is applied. 

The latest figure shows the last 60 days and is updated daily, with a lag of about 2 days; each month is archived as a day 1–31 figure once complete. Bars show the daily anomaly (°C; red above and blue below normal), the dark line its 7-day trailing mean, and the grey band the 10–90% range of 1991–2020 daily anomalies for the same time of year. The header gives the latest value, the month-to-date (or monthly) mean, and a note when the day or month ranks among the three warmest or coldest since 1979. The small map marks each region.