Preflight weather for the whole route
Know when to go.The forecast at every point on your route, at the time you'll be there.
Enter two airports. LegWx™ lays the weather along your whole flight out hour by hour for the next 7 days, rates every departure time against your personal minimums, and shows you when leaving earlier or later would be better.
The question every trip starts with
Your EFB shows the weather. LegWx™ tells you when to leave.
Planning a cross-country a few days out means opening a TAF at each end, guessing at everything in between, and doing the timing in your head. LegWx does that work for every hour you could leave.
The usual way
A TAF at each end, and a guess for the middle
TAF KALS 311720Z 3118/0118 26014G24KT P6SM BKN090 FM010000 24010KT P6SM SCT120 TAF KSKX ... ? 400 NM of route with no TAF ? what will it be at 11:40 when I'm over KLVS
- TAFs only reach about 24 to 30 hours out.
- Most of the route has no terminal forecast at all.
- You work out when you'll pass each point yourself.
With LegWx™
The whole route, timed, for every hour you could leave
- A forecast point about every 70 NM along your course, plus the airports.
- Timed with the winds aloft at your cruise altitude, so it shows what you'll fly through, when.
- 7 days out, blending TAFs, MOS and the NWS grid, each where it's strongest.
One bar for the whole flight.
The summary colors your route by the forecast at each point at the moment you'll be there. Under it, the next 36 departure hours, each one rated. Tap a better hour and the whole plan moves with it.
- Better times to leave, listed with how much later they are.
- Thunderstorm and icing lanes above the bar where they're forecast.
- Leave at or arrive by. Give it a landing time and it works the departure back.
Every point, every hour, seven days out.
One row per airport along the route, one column per hour. Your flight is a line drawn through it. Drag the departure and watch the line cross a different sky.
- Dotted where the forecasts disagree by two categories or more, so you know how far to trust an hour.
- TEMPO and PROB groups ride along the bottom without hiding the prevailing forecast.
- Cloud and icing at your cruise altitude from the GFS model, above each row.
It keeps score on the forecasts.
Every TAF in the country, and every LAMP, NBM, GFS MOS and NWS grid forecast LegWx™ uses, is checked against the METAR that followed, station by station and hour by hour of lead time.
- The blend trusts the proven source. Where one has a clearly better record at that airport, it wins.
- See the record yourself: best source 3, 12 and 24 hours ahead at each stop on your route.
It knows where the ground is.
A 1,500 ft ceiling at the airport can mean the ridges are in cloud. LegWx™ checks forecast ceilings against the highest terrain along each stretch of your route and calls out the high ground in cloud.
- Cloud on the high ground rates the departure as IFR, even when every airport looks VFR.
- Mountain wave from ridge-level winds, and density altitude at takeoff and landing.
- Best altitude for each leg from winds, cloud, icing and terrain clearance.
And the rest of the planning
Built by a pilot for the trips he actually flies.
Fit the trip to your week
Leave after Friday noon, home by Sunday at 6. It tries every outbound and return pair and lists the cleanest trips.
Your personal minimums
Set VFR or IFR limits once. Every rating, the trip planner and the alerts judge against them: within, close, or below.
Find the path with less weather
Searches 60 to 150 NM either side of course for the route that meets the least weather at your departure time.
Slide through the flight
Move through the trip and the map shows the advisories, SPC outlook, WPC fronts, TCF and radar valid at that moment, with a Skew-T at each point.
Alternates and icing
Flags when the 1-2-3 rule calls for an alternate and finds airports nearby with a TAF and enough runway. Icing from advisories, the model and PIREPs.
Stops and the way home
Up to three stops with time on the ground, plus the return flight. Save trips and aircraft; they sync across your devices.
Send it to ForeFlight or Garmin
Open the route in ForeFlight with speed and altitude, or save a Garmin .fpl, including any turning points around the weather.
A summary you can share
The whole trip in a few sentences, written from the data by fixed rules, so it never says more than the forecast does.
Phone, tablet or desk
Runs in the browser and installs on your home screen. Layouts for iPhone, iPad and a full desktop chart. The last forecast opens offline.
Watch this trip
It keeps checking after you close it.
Tap Watch and LegWx™ re-checks your trip all the way to departure, every 15 minutes near the time. You hear about it when it matters:
- Your planned departure gets better or worse.
- A new AIRMET or SIGMET lands on your route.
- A clearly better time opens in the next 36 hours.
- A short summary three hours before you leave.
T82 → C24 Sun 8:00 AM got worse. IFR near KLVS around 11:20 AM. Leaving 1:00 PM looks better.
New G-AIRMET on your route. Moderate turbulence below FL180, 580 to 605 NM.
Leaving in 3 hours. VFR the whole way, ceilings above the terrain, 8 kt headwind at 9,500.
Example alerts
One-minute tour
See a trip planned from start to finish.
Fredericksburg, Texas to Creede, Colorado: 605 NM, rising terrain, and a destination at 8,680 ft. Exactly the kind of trip LegWx™ was built for.
Founding members
Be one of the first 500 pilots.
LegWx™ opens to founding members first. Join the list and we'll email you the moment memberships open.
Locked in for as long as you keep your membership. Regular price $79 a year.
- Every feature, on every device you use.
- Early access while LegWx is shaped by its first pilots.
- A direct line to the builder for what you want next.
Questions
Before you sign up
Does it replace ForeFlight or Garmin Pilot?
No. Keep your EFB for the flight itself. LegWx™ is the planning step before you open it: when to go, which way, and at what altitude. When you've picked a time, it sends the route to ForeFlight or Garmin Pilot.
Is this an official weather briefing?
No. LegWx™ is a planning aid built on National Weather Service data. Get a standard briefing from Flight Service (1800wxbrief.com) before you fly.
What do I need to run it?
A web browser on your phone, tablet or computer. Add it to your home screen for trip alerts; on iPhone, alerts need the home screen app.
Where does it work?
Anywhere in the United States covered by National Weather Service forecasts. Terrain checks cover North America.
How far ahead can I plan?
Seven days. Hour-by-hour ceilings and visibility come from TAFs and MOS for the first three days or so; beyond that it shows an outlook from the longer-range guidance, marked as such.
What does a founding membership cost?
$49 a year, kept for as long as you stay a member. The regular price will be $79 a year. Founding places are limited to the first 500 pilots.