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 16 days, and tells you what changed and why in plain English.

Also on iPhone · coming soon Android · coming soon · Installs on Windows
Live forecast
—
Loading the latest model run…
 
16-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.

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

16-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 16 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.

Pricing

Start free. Try Pro free for 7 days when you want the full picture.

Free

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

Pro Yearly FOUNDING PRICE

$119.99/year
Billed once a year. Price locked in while you stay subscribed.
  • Everything in Free
  • 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

Pro Monthly

$19.99/month
First 3 months $14.99/month. Cancel anytime.
  • Everything in Pro Yearly
  • Pay month to month
  • Cancel anytime from Account
  • Switch to yearly whenever you like
Start 7-day free trial
FeatureFreePro
16-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—✓

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 subscribers on the web get 7 days free. You add a card at checkout, and you're only charged when the trial ends. 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