KMWH — Grant County International Airport
fog forecast & climatology · Moses Lake city page · full 10-year analysis →
No fog signal in NWS guidance for the next 48 hours. September typically brings about 2 hours of dense fog here.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly
- Fog hours per year
- 102 h below CAT I minima (2016–2026 average)
- Fog season
- January and December
- Typical fog event
- ~2 h once it forms (middle half 1–4 h, n=399)
- Data through
- 2026-08-15 · machine-readable data.json
When this airport fogs in
In a typical year Grant County International Airport spends 102 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in January and December. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.
Fog season
Fog season runs November through February, peaking in January; fog is mostly a 6 AM–9 AM phenomenon; typically thinning out by noon; a typical event lasts about 2 hours once it forms local time · 10-yr average
Runway infrastructure
| end | approach lights | best approach | length | RVR |
|---|---|---|---|---|
| 04 | — | LPV | 10,000 ft | — |
| 22 | — | LPV | 10,000 ft | — |
| 09 | — | — | 3,500 ft | — |
| 27 | — | — | 3,500 ft | — |
| 14L | — | LPV | 13,503 ft | — |
| 32R | MALSR | CAT I | 13,503 ft | — |
| 14R | — | — | 2,936 ft | — |
| 32L | — | — | 2,936 ft | — |
| 18 | — | — | 3,327 ft | — |
| 36 | — | — | 3,327 ft | — |
From FAA NASR / curated AIP Canada research. Approach-light class and minima tier drive how low an approach can be flown — details in the chase board.
For flight operations
EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — receipts on the scorecard. Methodology.
Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.