William Robert Johnston Municipal Airport (KM90) Area Aviation Weather & Runway Winds
Aviation weather near William Robert Johnston Municipal Airport in Mendota, CA, decoded from the nearest reporting station (KMAE) — conditions, runway crosswinds, and free Telegram airport alerts.
William Robert Johnston Municipal Airport (KM90) is a general aviation airport serving pilots in and around Mendota, CA at 162 ft. KM90 has no weather station of its own — conditions here are decoded from KMAE, about 19 nm away, the nearest reporting station, and local conditions can differ. Its 2 runways (15, 33) — longest 3,499 ft — are checked against the current wind in the crosswind table below. CTAF is 122.9. Track it in the ATIS Alerts Telegram bot to get alerts read from KMAE, the station this page is based on.
No weather station at this airport — showing the nearest station KMAE, 18.6 nm away.
Wind from the west-northwest (300°) at 5 kt, visibility 10+ statute miles, no cloud data, temperature 26°C (79°F), altimeter 29.81 inHg. Conditions are Visual Flight Rules (VFR).
METAR KMAE 290355Z AUTO 30005KT 10SM CLR 26/14 A2981 RMK AO2 SLP091 T02610144 $
What changed at KMAE (nearest station)?
Since the 0255Z (7:55 PM PDT) report — compared automatically against the latest METAR.
- Temperature down 3°C.
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Current pilot readout for KM90
Based on the nearest station (KMAE), KM90 is currently VFR with winds from 300° at 5 knots, visibility 10+ statute miles, and no ceiling reported. The strongest crosswind component is currently on runway 15, about 3 knots. Density altitude is approximately 1,650 ft (field elevation 162 ft). KM90 does not publish a TAF — the nearest TAF station is KFAT, about 31 nm away.
⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →
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Track KM90 free on TelegramRunway wind check
Estimated head/tailwind and crosswind for each runway end from the current reported wind.
Use this section to quickly compare current wind alignment across available runways at KM90. This is intended as a planning aid only and should not replace official performance calculations or pilot judgment.
| Runway | Length | Surface | Head / Tail | Crosswind |
|---|---|---|---|---|
| 33FAV | 3,499 ft | ASP | 4 kt head | 3 kt left |
| 15 | 3,499 ft | ASP | 4 kt tail | 3 kt right |
Open the crosswind calculator — try your own wind and runway numbers →
24-hour trend
Wind, ceiling and flight category over the last 24 hours.
Over the last 23 h: wind 8→5 kt, ceiling unlimited → unlimited.
KM90 weather radar
Live NEXRAD + lightning, with a 4-hour future-radar forecast — drag to pan, tap ⚡ to toggle lightning.
Live weather radar around William Robert Johnston Municipal Airport in Mendota, CA: the NOAA/NWS NEXRAD composite updates about every five minutes, with NOAA lightning strike density overlaid. The loop plays the past 50 minutes, then continues into a future-radar forecast (+1 to +4 hours, NOAA HRRR model) so you can see where precipitation around KM90 is headed.
Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © OpenStreetMap © CARTO
Forecast frames (amber label) are HRRR model guidance, not observed radar. Lightning strike density appears as a blue-white glow when strikes are detected in view. Radar and lightning coverage are limited in parts of Alaska, Hawaii, and offshore areas. Not for navigation.
Pilot reports (PIREPs) within 100 NM of KM90
Reported by pilots in flight over the past 6 hours — via aviationweather.gov.
Show raw report
PRB UA /OV ROM/TM 0413/FL350/TP B738/TB CONS LGT-MOD CHOP/RM ENTERED BY ZOA FDCS
PRB UAHeader — reporting station and UA: a routine pilot report.OV ROMLocation — fix or navaid, optionally with a radial and distance in NM.TM 0413Reported at 04:13 UTC.FL350Altitude: 35,000 ft MSL.TP B738Aircraft type reporting.TB CONS LGT-MOD CHOPTurbulence: continuous light to moderate chop.RM ENTERED BY ZOA FDCSRemarks.Show raw report
SCK UA /OV LIN /TM 0352 /FL065 /TP C172 /SK SKC /TA 20 /WV 26003KT /TB NEG /IC NEG /RM HZ LYR BLO NORTH TO COMANCHE RESEVOIR WEST TO RIVER DELTA
SCK UAHeader — reporting station and UA: a routine pilot report.OV LINLocation — fix or navaid, optionally with a radial and distance in NM.TM 0352Reported at 03:52 UTC.FL065Altitude: 6,500 ft MSL.TP C172Aircraft type reporting.SK SKCSky condition — cloud bases and tops in hundreds of feet MSL.TA 20Outside air temperature, °C.WV 26003KTWind (direction/speed) or wind-shear remarks.TB NEGTurbulence: none reported.IC NEGIcing: none reported.RM HZ LYR BLO NORTH TO COMAN…Remarks.Show raw report
MRY UA /OV KMRY/TM 0236/FLDURC/TP A319/SK OVC009
MRY UAHeader — reporting station and UA: a routine pilot report.OV KMRYLocation — fix or navaid, optionally with a radial and distance in NM.TM 0236Reported at 02:36 UTC.FLDURCReported during climb.TP A319Aircraft type reporting.SK OVC009Sky condition — cloud bases and tops in hundreds of feet MSL.Show raw report
TPH UA /OV MMH340005/TM 0104/FL200/TP E170/TB MOD/RM ENTERED BY ZOA FDCS
TPH UAHeader — reporting station and UA: a routine pilot report.OV MMH340005Location — fix or navaid, optionally with a radial and distance in NM.TM 0104Reported at 01:04 UTC.FL200Altitude: 20,000 ft MSL.TP E170Aircraft type reporting.TB MODTurbulence: moderate.RM ENTERED BY ZOA FDCSRemarks.⚠️ PIREPs are unverified pilot reports. Not for operational use — conditions change between reports.
Recent aviation weather trends at KM90
From ATIS Alerts' hourly weather history.
Over the past 24 hours, the nearest station KMAE reported mostly VFR across 24 observations, with 0 flight-category changes. Wind most often came from the NW.
- 33
- 98%
- 15
- 2%
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Airport facts
Reference data from the OurAirports dataset.
- Type
- General aviation airport
- FAA LID
- M90
- City
- Mendota
- State
- California
- Country
- United States
- Elevation
- 162 ft
- Coordinates
- 36.7586, -120.3710
- Runways
- 2
- Longest runway
- 3,499 ft
- Weather reporting
- Nearest station KMAE
- TAF
- Nearest KFAT
- CTAF
- 122.9 MHz
- Time zone
- America/Los_Angeles
- Next sunset
- 22h 25m
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Nearby airports
Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.
Within 25 NM
8 airports+2 more within 25 NM
25–50 NM
8 airports+2 more within 50 NM
50–100 NM
8 airports+2 more within 100 NM
KM90 weather — frequently asked
What runways are available at KM90?+
KM90 has 2 runways — 15, 33; the longest is 3,499 ft. This page computes the live crosswind for each runway end from the current wind.
Where does the weather shown for KM90 come from?+
William Robert Johnston Municipal Airport does not have its own weather station. Conditions shown here come from the nearest reporting station, KMAE, about 19 nm away — close enough for situational awareness, but local conditions at KM90 can differ.
Does KM90 have a TAF?+
No — KM90 does not publish its own TAF. The nearest TAF station is KFAT, about 31 nm away.
Does KM90 broadcast D-ATIS?+
No — KM90 does not broadcast D-ATIS. Alerts for KM90 from the ATIS Alerts bot (@atisalerts_bot) are based on its METAR (via the nearest reporting station) instead.
Pilot PIREPs for William Robert Johnston Municipal Airport (KM90)
Community-submittedCommunity-submitted airport notes from pilots about runway conditions, wildlife, FBOs, fuel, turbulence, ramp access, and local tips.
Read recent community-submitted pilot notes for William Robert Johnston Municipal Airport, including runway conditions, wildlife activity, FBO/fuel notes, turbulence, ramp access, and local airport tips.
⚠️ Pilot PIREPs on ATIS Alerts are community-submitted airport notes for situational awareness only. They are not official FAA PIREPs, NOTAMs, weather briefings, airport advisories, or flight-planning guidance. Always verify with official FAA/NWS sources, airport management, ATC, and current publications.
No Pilot PIREPs have been submitted for KM90 yet. Recently flew here? Help the next pilot by leaving a quick airport note.
Pilot PIREPs are community pilot notes for situational awareness only — not official FAA PIREPs or advisories. Verify with official sources. Notes are moderated before they appear; helpful marks and reports help us keep them useful.
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⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
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