Sondex Skew-T for Omaha from the GFS 12Z run, valid Wednesday 22Z, with the buoyant layer shaded and EL, −20 °C, 0 °C and LCL pinned on the profile
OAX · GFS 12Z · Wed 22Z MU CAPE 1,755 J/kg

Model soundings for iPhone, iPad and Mac.

Skew-T, hodograph and ten more charts from every GFS, HRRR, RAP and RRFS run. Monitor a station and Sondex pulls each new cycle, then briefs the next 48 hours in one sentence.

Join the TestFlight beta See a live sounding

$5 on the App Store at launch, free in TestFlight until then.

Time-height section: relative humidity deepening Thursday and Saturday under the wind barbs
Time-height
Station sheet for Omaha: the newest profile with 0 °C at 3.2 km and the LCL at 1.0 km pinned
Station sheet
CAPE through the run against marginal, elevated and significant lines, peaking at 1,158 J/kg Wednesday 22Z
Indices through time

Home briefing

Good afternoon. 2 of your 3 stations have a storm window in the next 48 hours, the strongest at OUN: numerous storms around Wed 01Z. HRRR arrives in 7m.

Home briefing, Oct 26 2026, 20:52Z

OAX Omaha

No outlook

Following the newest run of each model

HRRR 18Z scattered
RAP 19Z doesn't reach it
NAM 12Z isolated
GFS 12Z unlikely

Best window Wed 17Z

HRRR scattered, RAP doesn't reach it, NAM isolated, GFS unlikely.

353
J/kg CAPE
28
kt 0–6 km shear
0
J/kg CIN

Open the Skew-T · HRRR 18Z, Wed 17Z

Omaha panel, Oct 26 2026, 20:55Z. NAM was retired on Nov 3, and RRFS now takes its row.
Templates, not generation
The sentence is assembled from the SPC outlook, each monitored station's newest runs and the next cycle. It reads the same on every device, and every token in it opens the run or the station it names.
Every model, side by side
A station's panel reads each model it follows from the top of the hour on: a storm-chance ribbon per model, the best window named, and CAPE, shear and CIN for the hour under your finger.
The read stays on device
Where Apple Intelligence is available, Apple's on-device model narrates a station's forecast read from the file's own numbers. Everywhere else, templates write it. Nothing leaves the device, and it works offline.
Sondex Home: a one-sentence briefing of three monitored stations, with the SPC Day 1 outlook map and the stations on it

Drag the hour.

The same Omaha run as the phone above, drawn live in your browser from the BUFKIT file. In the app, every chart follows one playhead like this one.

OAX GFS 12Z · Mon Oct 26 2026 Omaha NWS office, Valley, Nebraska

Wed Oct 28 · 22Z

Skew-T
Hodograph

Ticks sit at real valid times: hourly to F+120, then 3-hourly. The strip under them is each hour's storm potential from model CAPE and 0–6 km shear, on the SPC ramp. Values here are computed in the browser and can differ slightly from the app's. Use the arrow keys on the timeline to step an hour at a time.

Loading the run…

Twelve charts

Switch charts and the forecast hour stays put. Thresholds sit behind the data as labeled lines, and color is reserved for severity.

  • Skew-T with temperature, dewpoint, wet-bulb and parcel traces, CAPE shaded, and EL 11.4 km, −20 °C, 0 °C and LCL pinned
    Skew-T Log-P CAPE as halftone in its own severity, callouts pinned on the profile.
  • Hodograph in 0–3, 3–6, 6–9 and 9–12 km layer bands with the Bunkers right and left movers and 0–3 km SRH shaded
    Hodograph Layer bands, Bunkers motion, SRH shaded from the right mover.
  • Time-height section of relative humidity and wind barbs for Omaha across the week
    Time-height Relative humidity in one hue, light to dark, under the barbs.
  • CAPE and CIN through the run against marginal, elevated, significant and cap lines, 1,158 J/kg at Wednesday 22Z
    Indices through time CAPE and CIN against labeled threshold lines.
  • CAPE against 0–6 km shear for every hour of the run, Wednesday 22Z at 1,158 J/kg and 29 kt, with ordinary cell, multicell and supercell regions
    CAPE–shear The whole run as a trail across storm-mode regimes.

Screenshots: Sondex on iPhone, OAX, GFS 12Z run of Oct 26 2026, valid Wednesday 22Z.

All twelve

  • Skew-T Log-P
  • Hodograph
  • Time-height section
  • Indices through time
  • CAPE–shear
  • Precipitation type
  • Moisture potential
  • Apparent temperature
  • Accumulation
  • Bourgouin energy
  • Mixing height
  • Ensemble plumes

How it works

  1. 01

    Monitor a station

    Search 1,078 stations by name, ID or state, or take the nearest. A monitored station leads Home and pulls its own runs.

    OAX · TUL · OUN

  2. 02

    Follow the models

    HRRR and GFS by default, plus RAP and RRFS per station. Each cycle lands as the Mesonet posts it.

    HRRR 18Z F+48
    RAP 19Z F+21
    RRFS 12Z F+84
    GFS 12Z F+180
  3. 03

    Read the brief

    Home reads every monitored station's newest runs into one sentence, with the SPC Day 1 and Day 2 outlooks on the map and a 48-hour ribbon per station. Files parse on device and stay readable offline.

    3 stations · 14 runs · 20:52Z

  4. 04

    Analyze

    Tap the hour the brief names and the Skew-T opens on it. Twelve charts, a readout under each, one scrubber.

    MU CAPE 1,755 J/kg · Wed 22Z

1,078 stations, Key West to the North Slope.

OAX Omaha NWS
Lower 48 shown: 988 stations. Plus 68 in Alaska and 22 across Hawaii, the Caribbean and the Pacific. Larger dots are NWS offices.

The catalog ships inside the app, so search works without a signal. Pick a site and Sondex lists every model it carries, with the newest cycle of each. Yours, Nearby and All are one tap apart on the map.

Stations by model

GFS 1,076
RAP 1,057
RRFS 1,024
HRRR 966

Each device gets its own layout.

Home on iPhone is one scroll: the briefing, then every monitored station. On iPad the sheet sits beside the stage, and the runs list and inspector sit beside the chart or hide for a full-screen Skew-T. On iPhone Duo the scrubber moves into the side bar.

Sondex Home on iPhone on Oct 26 2026, the Omaha panel expanded: HRRR, RAP, NAM and GFS ribbons, best window Wed 17Z, 353 J/kg CAPE, 28 kt shear and 0 CIN
iPhone · Monitoring, OAX
Sondex on iPad: full-screen Skew-T for Tulsa from the GFS 18Z run of Oct 9, Thursday 00Z, with EL, −20 °C, 0 °C, LFC and LCL pinned on the profile and the forecast-hour scrubber below
iPad · Skew-T, TUL GFS 18Z of Oct 9, Thu 00Z
Sondex on iPhone Duo: Skew-T for Omaha at full height, with the vertical scrubber, chart menu and Layers in the side bar
iPhone Duo · Skew-T, Wed 22Z
iPhone iOS 26 or later
iPad iPadOS 26 or later
Mac macOS 26 or later

iPhone Duo

Closed, the outer display keeps the chart at full height and the system side bar takes the scrubber, turned a quarter turn so the run reads top to bottom. Open, Home's stage sits beside its sheet and the chart beside its inspector, with the seam on the hinge so nothing lands in the fold.

Sondex Home on the iPhone Duo outer display: the briefing sentence and the SPC outlook map, with the toolbar and tab bar stacked in the side bar
Outer display · Home, 21:10Z
Sondex Skew-T for Omaha on the iPhone Duo outer display, GFS 12Z valid Wednesday 22Z, MU CAPE 1,873 J/kg, with the vertical scrubber, chart menu and Layers in the side bar
Outer display · Skew-T, OAX GFS 12Z, Wed 22Z
Closed
chart at full height, scrubber in the side bar
Open flat
two panes, seam on the hinge
Side bar
chart menu, Layers, Back and Share
Requires
iOS 27.1

Pricing

$5

One time, on the App Store at launch

No subscription, and no feature behind a paywall. Until launch, the full app is free in the TestFlight beta.

Join the TestFlight beta

Included

  • All twelve charts on one scrubber
  • GFS, HRRR, RAP and RRFS
  • 1,078-station catalog and the run archive
  • Station monitoring, with pulls in the background
  • Home briefing with the SPC Day 1 and Day 2 outlooks
  • The forecast read, written on device
  • BUFKIT import from Files, a link, the clipboard or a drop
  • iPhone, iPad, Mac and iPhone Duo

Pull tonight's 00Z.

Join the TestFlight beta now. Sondex is $5 on the App Store at launch.

Join the beta