EXIT 20 · MOS · Weather Trader

HRRR-MOS

Station equations correct HRRR forecasts using past observed errors. Daily extrema target the local standard day; issued guidance is evaluated separately from the raw model.

Open guidance ↗Market recap ↗Station model analysis ↗

What to inspect

Follow successive runs for the same target date. Compare error, bias and interval coverage on shared stations and dates. A sharper forecast is useful only when its uncertainty remains reliable.

Issued local-standard-day forecasts, where archived before the cutoff

Updates and availability

00 / 06 / 12 / 18 UTC cycles; delivery follows source arrival

Latest cycle on file: 2026101800
Issued UTC: 2026-10-18T02:00:30Z
Issue age: 1.3 hours

Age describes the retained issue, not a guarantee that the upstream feed is current.

Station and neighborhood context

Use the station page to compare diurnal evolution, nearby observations and weather regimes. The linked page contains all available sources; availability varies by station.

How to read the record

Raw models, corrected station products and downscaled grids forecast different things. Market recap shows its decision cutoff, settlement basis and coverage. Missing forecasts are unavailable, never zero. Inclusion in this directory or recap does not imply inclusion in a trading blend.

Existing model verification and cycle archive ↗

EXIT 10 ↗Regional

HRRR

Rapid-refresh regional guidance for the evolving temperature curve, clouds and convection. Short-range and extended cycles provide different coverage.

NOAA / NCEPExplore guidance and its verification record

EXIT 27 ↗Hourly MOS

HRRR-MOS hourly

An hourly-cycle station product using the forecast and observations available to the issue. Same-day highs and lows can contain observations already recorded.

Weather TraderIssue record: 2026-10-18T02:36:01Z

EXIT 42 ↗Regional

HRRR subhourly

Quarter-hour guidance used to investigate brief warming, cooling and transition timing that hourly samples can miss. It is not a separate independent model.