Natural gas weather

Know how the weather changed gas demand, the minute it changes.

GasCast checks every GFS and ECMWF run, totals heating and cooling degree days for the next 15 days, and tells you what changed and why in plain English.

Live forecast
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Loading the latest model run…
 
15-day total—
vs normal—
ECMWF change—
Checks every 15 minutes Data from NOAA · ECMWF · EIA · NHC GFS & ECMWF side by side Web · Windows · iPhone · Android

See it in action

Real screens from GasCast (sample data shown).

GasCast · Today
GasCast Today page: the change in degree days since the last model run, GFS and ECMWF changes, a tropical storm alert and when each data source last updated
Today. How much the latest run moved, both models side by side, storms near the Gulf, and a live bar showing when every source last updated and what's coming next.
GasCast · Maps
City heat map with smooth color across the US showing how much warmer or colder than normal each region will be
City heat map. Every major city vs. normal, with region averages. Press Play to step through the next 14 days.
GasCast · Supply & demand
Supply and demand page: daily power burn chart, dry production, LNG exports and the monthly supply/demand balance
Supply & demand. Daily power burn vs. last year, production, LNG exports and the monthly balance, from EIA.
GasCast · Desk view
GasCast Desk view on a wide screen: a live ticker, the latest run change by model, the 15-day forecast, storage, regions, confidence, the power grid and a NOAA outlook map
Desk view. One full screen for a second monitor: a live ticker with ET and UTC clocks, the latest run change by model, the 15-day forecast by period, storage, regions, the power grid and NOAA outlooks. Refreshes on its own.

Everything that moves gas demand, in one place

Built for natural gas traders who want the weather picture without digging through model maps.

Degree days, every run

15-day heating and cooling degree days vs. normal, how much each run changed, and the day-by-day breakdown.

What changed and why PRO

A plain-English write-up after every update: which regions moved, whether the models agree, and what to watch next.

GFS vs ECMWF

See both major models side by side, plus how confident the ensemble is for each forecast window.

EIA storage

Weekly storage vs. the 5-year average and last year, with the next report time always on screen.

Supply & demand PRO

Daily LNG feedgas by terminal and power burn, plus production, exports and the monthly balance, plus live grid demand for ERCOT, PJM, MISO, CAISO and more.

Maps & outlooks PRO

NOAA 6–10, 8–14 and weeks 3–4 maps, a city heat map you can play day by day, and a weeks 3–5 demand outlook.

Tropics

Active storms from the National Hurricane Center, flagged when they're in or near the Gulf of Mexico, where storms can shut in production and LNG exports.

Patterns & past seasons PRO

NOAA's 2-week AO, NAO and PNA forecasts, and the seasons since 1981 whose weather looked most like this one, with what came next.

Forecast evolution PRO

A grid of every forecast day across recent runs, colored by whether it got colder or warmer, so you can spot a trend before it shows up in the total.

How it works

GasCast checks for new forecast data about every 15 minutes, all day.

New model run lands

GFS and ECMWF update several times a day. GasCast picks up each run as soon as it's out.

We total the degree days

Population-weighted HDD and CDD for the next 15 days, compared to normal and to the last run.

You see what changed

Colder or warmer, which regions moved, and how sure the models are, in a few seconds.

Download GasCast for your computer

Install GasCast as a desktop app. It opens in its own window, stays on your taskbar or Dock, and updates itself. Free, no account needed.

Your computer

Windows download

For Windows 10 and 11. Pins to your Start menu and taskbar, and sends forecast alerts as Windows notifications.

  • Its own window, no browser tabs
  • Opens to today's forecast
  • Updates automatically
Microsoft Store · coming soon
Your computer

Mac download

For macOS Sonoma or later. Sits in your Dock and opens like any other Mac app, with forecast alerts as Mac notifications.

  • Its own window, no browser tabs
  • Opens to today's forecast
  • Updates automatically
Mac App Store · coming soon

On a phone? GasCast is coming to iPhone and Android.

Pricing

Start free. Pro Yearly includes a 7-day free trial; Pro Monthly starts at $14.99 for the first 3 months. Pro+ adds more market data, at an early-access price.

Free

$0
No account needed.
  • 15-day HDD & CDD forecast
  • Change vs. last run, GFS & ECMWF
  • Regions, storage, confidence
  • Futures calculator
Open GasCast

Pro Monthly

$19.99/month
First 3 months $14.99/month. Cancel anytime.
  • All Pro features
  • Pay month to month
  • Cancel anytime from Account
  • Switch to yearly whenever you like
Get Pro Monthly

Pro+ EARLY ACCESS

$24.99/month
or $199.99/year. Early subscribers keep this price; later $34.99/month for new subscribers.
  • Everything in Pro, plus:
  • Bias-corrected 7-model consensus
  • Every US power grid region
  • Wind & solar outlook
  • Nuclear outages
  • Fund positioning (CFTC)
  • Trade journal, Pro+ alerts
See Pro+

Pro Yearly FOUNDING SALE · SAVE $40

$119.99/year$159.99
Founding price: $119.99 instead of $159.99, locked in for as long as you stay subscribed. Billed once a year.
  • All free features, plus:
  • Plain-English report every update
  • History & model track record
  • Maps, city heat map, outlooks
  • Supply & demand, power grid
  • Weather patterns & past seasons
Start 7-day free trial
FeatureFreeProPro+
15-day HDD & CDD forecast vs. normal✓✓✓
Change vs. last run, GFS & ECMWF✓✓✓
Regions, EIA storage, forecast confidence✓✓✓
Season-to-date chart, futures calculator✓✓✓
Tropics: active storms near the Gulf✓✓✓
Plain-English "what changed" report—✓✓
Corrected forecast (checked against NOAA)—✓✓
Weekly storage estimate before EIA—✓✓
City heat map & NOAA outlook maps—✓✓
Supply & demand: daily LNG feedgas & power burn, monthly balance—✓✓
Live power grid demand & gas generation—✓✓
Weather patterns, similar past seasons, forecast evolution—✓✓
History & model track record—✓✓
Windows notifications & daily email—✓✓
Bias-corrected model consensus: 4 models + 3 ensemble averages——✓
Every US grid region & operator, with wind, solar & gas burn——✓
Wind & solar outlook, next 7 days——✓
Nuclear outages: offline GW & each reactor——✓
Fund positioning: weekly CFTC report——✓
Trade journal & Pro+ alerts——✓

Pro+ · early access

Pro+ is the plan above Pro, for traders who want more data. It's open now at an early-access price, and new features keep arriving.

Live now

Live

Bias-corrected 7-model consensus

GFS, ECMWF, ECMWF AIFS, GEM and the GFS, ECMWF and Canadian ensemble averages, each corrected for its recent errors against NOAA's observed degree days, then blended, with how far apart they are.

Live

Every US power grid

All 13 grid regions and 7 grid operators: demand, gas, wind and solar generation, and estimated gas burn.

Live

Wind and solar outlook

A 7-day estimate for the main wind and solar areas. Less wind usually means more gas burned for power.

Live

Nuclear outages

How much nuclear is offline today, which reactors, and what changed since yesterday.

Live

Fund positioning

The weekly CFTC report: how large traders are positioned in natural gas.

Live

Trade journal

Log your own trades next to what the forecast did. Your trades stay on your computer.

Live

Pro+ alerts and CSV export

Alerts for nuclear outages, model consensus moves, low wind and the CFTC report. Download any table.

Coming next

Pro+

Europe and Asia weather

Heating and cooling demand for Europe and Asia, plus EU gas storage and Japan's LNG stocks, on a world map.

Pro+

Morning briefing

One push or email at 6 a.m. covering what changed overnight across the models, storage and the grid.

Apps

Pro+ on iPhone and Android, plus app stores

Pro+ in the GasCast phone apps, and GasCast in the Microsoft Store and Mac App Store.

Everything here is forecast and market information only. GasCast will never tell you when to buy or sell. Plans can change.

Free updates in your Discord

Trading group on Discord? GasCast can post the morning and midday forecast changes, big model shifts and the EIA storage number straight into your channel. Free.

  1. In Discord, open the channel's settings → Integrations → Webhooks → New Webhook.
  2. Click Copy Webhook URL and paste it below.

To stop, delete the webhook in Discord.

Questions

What are heating and cooling degree days?

One heating degree day (HDD) is one degree below 65°F for one day. One cooling degree day (CDD) is one degree above 65°F. More HDDs mean more heating demand for natural gas; more CDDs mean more air-conditioning demand, much of it met by gas-fired power plants.

Which weather models does GasCast use?

The American GFS and the European ECMWF, plus their ensembles for confidence, and NOAA Climate Prediction Center outlooks for the longer range.

Where does the data come from, and how accurate is it?

Weather models (GFS and ECMWF) and measured degree days come from NOAA and ECMWF; storage and power grid data come from the EIA. GasCast checks the models against NOAA's measured data every day and shows how accurate each one has been. See How GasCast works for the full details.

Does GasCast tell me when to buy or sell?

No. GasCast shows weather and forecast information only. Trading decisions are always yours.

Can I use it on Windows?

Yes. Open GasCast in Microsoft Edge or Chrome and choose Install app. It gets its own window, Start menu entry and taskbar icon.

Does a web subscription work in the phone apps?

Web subscriptions unlock Pro on the website and the Windows app. iPhone and Android subscriptions are managed in the App Store and Google Play.

How does the free trial work?

New Pro Yearly subscribers on the web get 7 days free. You add a card at checkout, and you're only charged when the trial ends. Pro Monthly has no trial; instead, your first 3 months are $14.99/month. Cancel before then from Account → Manage subscription and you won't pay anything.

How do I cancel?

Anytime, from Account → Manage subscription. You keep Pro until the end of the period you paid for.

See today's forecast

Free, no account needed.

Open GasCast