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Larson's Seaplane Base (MA74) Area Aviation Weather & Runway Winds

As of 9:56 AM ET, Oct 27, based on the nearest station (KASH), MA74 is currently VFR with winds from 300° at 6 knots, visibility 10+ statute miles, and no ceiling reported.

Aviation weather near Larson's Seaplane Base in Tyngsboro, MA, decoded from the nearest reporting station (KASH): conditions and runway crosswinds.

Larson's Seaplane Base (MA74) is a seaplane base in Tyngsboro, MA. MA74 has no weather station of its own. Conditions here are decoded from KASH, about 7 nm away, the nearest reporting station, and local conditions can differ. It has 2 physical runways (13W, 31W), the longest 2,500 ft. The nearest TAF is issued for KBED.

Ask ATIS AIAsk anything about MA74's weather, runways or delays, or search another airport.
VFR
Observed 1356Z (9:56 AM EDT)live · refreshes every 60s

No weather station at this airport: showing the nearest station KASH, 6.9 nm away.

Wind
300° 6 kt
Visibility
10+ sm
Ceiling
Unlimited
Altimeter
30.38"
Temp / Dew
47°F / 8°C
feels like 44°F

Wind from the west-northwest (300°) at 6 kt, visibility 10+ statute miles, no cloud data, temperature 8°C (47°F), altimeter 30.38 inHg. Conditions are Visual Flight Rules (VFR).

Raw METAR
METAR KASH 271356Z 30006KT 10SM CLR 08/M03 A3038 RMK AO2 SLP289 T00831028

What changed at KASH (nearest station)?

Since the 1256Z (8:56 AM EDT) report, compared automatically against the latest METAR.

No significant changes since the 1256Z (8:56 AM EDT) report, conditions are holding steady.

Current pilot readout for MA74

Based on the nearest station (KASH), MA74 is currently VFR with winds from 300° at 6 knots, visibility 10+ statute miles, and no ceiling reported. Density altitude is approximately -1,250 ft (field elevation 90 ft). MA74 does not publish a TAF. The nearest TAF station is KBED, about 15 nm away.

New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →

Runway wind check

Estimated head/tailwind and crosswind for each runway end from the current reported wind.

RunwayHead / TailCrosswind
13WFAV3 kt head5 kt left
31W3 kt head5 kt left

Open the crosswind calculator to try your own wind and runway numbers →

24-hour trend

Wind, ceiling and flight category over the last 24 hours.

Wind (kt)Gusts (kt)Bottom strip, flight category:VFRMVFRIFRLIFRNo report
061214Z03Z13Z

Over the last 23 h: wind 0→6 kt, ceiling unlimited → unlimited.

MA74 weather radar

Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.

Loading…
Loading radar…

Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap

NOAA NEXRAD composite and lightning, updated about every five minutes; amber frames are HRRR model guidance, not observed radar. Not for navigation.

Pilot reports (PIREPs) within 100 NM of MA74

Reported by pilots in flight over the past 6 hours, via aviationweather.gov.

PIREP1355Z (9:55 AM EDT) · 72 NM SW of MA74 · 38,000 ft MSL · CL35
continuous light chop turbulence
Show raw report
BDL UA /OV BDL/TM 1355/FL380/TP CL35/TB CONS LGT CHOP
BDL UAHeader: reporting station and UA: a routine pilot report.
OV BDLLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1355Reported at 13:55 UTC.
FL380Altitude: 38,000 ft MSL.
TP CL35Aircraft type reporting.
TB CONS LGT CHOPTurbulence: continuous light chop.
PIREP1350Z (9:50 AM EDT) · 28 NM SE of MA74 · 39,000 ft MSL · B772
light occasional moderate chop turbulence
Show raw report
BOS UA /OV BOS/TM 1350/FL390/TP B772/TB LGT OCNL MOD CHOP
BOS UAHeader: reporting station and UA: a routine pilot report.
OV BOSLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1350Reported at 13:50 UTC.
FL390Altitude: 39,000 ft MSL.
TP B772Aircraft type reporting.
TB LGT OCNL MOD CHOPTurbulence: light occasional moderate chop.
PIREP1335Z (9:35 AM EDT) · 72 NM W of MA74 · during climb · C750
occasional light to moderate 37,000–41,000 ft none reported abv turbulence
Show raw report
BAF UA /OV CTR/TM 1335/FL370/TP C750/TB OCNL LGT-MOD 370-410 NEG ABV/RM DURC
BAF UAHeader: reporting station and UA: a routine pilot report.
OV CTRLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1335Reported at 13:35 UTC.
FL370Altitude: 37,000 ft MSL.
TP C750Aircraft type reporting.
TB OCNL LGT-MOD 370-410 NEG …Turbulence: occasional light to moderate 37,000–41,000 ft none reported abv.
RM DURCRemarks.
PIREP1305Z (9:05 AM EDT) · 31 NM SW of MA74 · 2,500 ft MSL · BE58
Show raw report
BDL UA /OV KORH120006/TM 1305/FL025/TP BE58/WV 020015KT
BDL UAHeader: reporting station and UA: a routine pilot report.
OV KORH120006Location: fix or navaid, optionally with a radial and distance in NM.
TM 1305Reported at 13:05 UTC.
FL025Altitude: 2,500 ft MSL.
TP BE58Aircraft type reporting.
WV 020015KTWind (direction/speed) or wind-shear remarks.
PIREP1301Z (9:01 AM EDT) · 60 NM NE of MA74 · during climb · B737
Show raw report
PWM UA /OV PWM-LCI/TM 1301/FL360/TP B737/TB NEG BLO 360/RM DURC
PWM UAHeader: reporting station and UA: a routine pilot report.
OV PWM-LCILocation: fix or navaid, optionally with a radial and distance in NM.
TM 1301Reported at 13:01 UTC.
FL360Altitude: 36,000 ft MSL.
TP B737Aircraft type reporting.
TB NEG BLO 360Turbulence: none reported blo 360.
RM DURCRemarks.
PIREP1300Z (9:00 AM EDT) · 72 NM W of MA74 · 28,000 ft MSL · E75S
Show raw report
BAF UA /OV CTR/TM 1300/FL280/TP E75S/TB NEG
BAF UAHeader: reporting station and UA: a routine pilot report.
OV CTRLocation: fix or navaid, optionally with a radial and distance in NM.
TM 1300Reported at 13:00 UTC.
FL280Altitude: 28,000 ft MSL.
TP E75SAircraft type reporting.
TB NEGTurbulence: none reported.
PIREP0916Z (5:16 AM EDT) · 15 NM N of MA74 · 38,000 ft MSL · B789
continuous light occasional moderate chop turbulence
Show raw report
MHT UA /OV MHT/TM 0916/FL380/TP B789/TB CONS LGT OCNL MOD CHOP
MHT UAHeader: reporting station and UA: a routine pilot report.
OV MHTLocation: fix or navaid, optionally with a radial and distance in NM.
TM 0916Reported at 09:16 UTC.
FL380Altitude: 38,000 ft MSL.
TP B789Aircraft type reporting.
TB CONS LGT OCNL MOD CHOPTurbulence: continuous light occasional moderate chop.

⚠️ PIREPs are unverified pilot reports. Not for operational use: conditions change between reports.

Recent aviation weather trends at MA74

From ATIS Alerts' hourly weather history.

Over the past 24 hours, the nearest station KASH reported mostly VFR across 26 observations, with 2 flight-category changes. The lowest ceiling was 5,000 ft. Wind most often came from the NW.

Last 24 hours
VFR 96%IFR 4%
Wind avg/max: 6/9 kt
Max gust: -
Lowest ceiling: 5,000 ft
Lowest vis: -
Prevailing wind: NW
Category changes: 2

Most recent change: IFR → VFR

Last 7 days
VFR 100%
Wind avg/max: 3/17 kt
Max gust: 25 kt
Lowest ceiling: 5,000 ft
Lowest vis: 10 sm
Prevailing wind: NW
Category changes: 0
Wind-favored runway - past 30 days

Share of hours each runway had the most headwind. From wind reports, not ATC assignments.

13W/31W
100%

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Field aerial

North up

Aerial photo of Larson's Seaplane Base (MA74)
N ↑

Imagery: USGS The National Map (public domain). Something off? ✏️ Suggest an edit

Airport info

From the FAA airport record (cycle 2026-10-01) and OurAirports.

Services

Attended
Daily DALGT local
Landing fee
No
Control tower
None

Airport

Type
Seaplane base
FAA LID
MA74
City
Tyngsboro
State
Massachusetts
Country
United States
Elevation
90 ft
Coordinates
42.6915, -71.4181
Runways
2 physical runways · 2 runway ends
Longest runway
2,500 ft
Weather reporting
Nearest station KASH
TAF
Nearest KBED
Time zone
America/New_York
Sunset in
7h 6m

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Nearby airports

Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.

VFRMVFRIFRLIFRNo report

RC flying fields nearby

AMA model-aircraft club fields around this airport: live wind, crosswind & flyability on each page.

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Pilot PIREPs for Larson's Seaplane Base (MA74)

Community-submitted

Community-submitted airport notes from pilots about runway conditions, wildlife, FBOs, fuel, turbulence, ramp access, and local tips.

Read recent community-submitted pilot notes for Larson's Seaplane Base, 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 MA74 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.

⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.

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