What is the Composite Weather Variable (CWV)?

The Composite Weather Variable (CWV) is the UK gas industry's standard daily measure of weather-driven gas demand. It is a regional index combining effective temperature, wind speed, and seasonal normal effects, calibrated by National Grid for each of the 13 UK Local Distribution Zones (LDZs). NBP traders, shippers, and energy meteorologists use CWV forecasts to anticipate UK gas demand revisions and price moves before the market reprices.

What are the UK gas LDZs?

The UK gas transmission network is divided into 13 Local Distribution Zones (LDZs), each operated by one of four Gas Distribution Networks (GDNs): Cadent, Northern Gas Networks, Wales and West Utilities, and SGN. The LDZs include Scotland, Northern, North West, North East, East Midlands, West Midlands, Wales North, Wales South, South West, Southern, Eastern, South East, and London. Each LDZ has its own CWV index reflecting regional weather-driven gas demand.

How do gas traders use CWV forecasts?

NBP gas traders use CWV forecasts to anticipate UK gas demand revisions before they reprice front-month and within-day contracts. Daily and sub-seasonal CWV outlooks across all 13 LDZs feed into demand forecasting models, storage decisions, and LNG flow timing. Energy meteorologists track CWV anomalies against the seasonal normal effect to spot mispriced contracts and brief traders on heating demand risk weeks ahead of the curve.

What is the UK National Balancing Point (NBP)?

The National Balancing Point (NBP) is the UK's virtual natural gas trading hub, the reference price for UK wholesale gas markets and one of Europe's most liquid gas benchmarks alongside TTF. NBP prices respond directly to UK gas demand, which is driven primarily by weather through the Composite Weather Variable (CWV) across the 13 UK LDZs. Energy meteorologists track CWV forecasts to anticipate NBP moves before the market reprices.

How accurate are CWV forecasts?

World Climate Service CWV forecast skill is documented continuously and on-demand since July 2018 across DTN and ECMWF model guidance for all UK regions out to 45 days. Energy meteorologists and risk managers use the Verification tool to defend forecast confidence to traders, demonstrate transparent skill to compliance, and identify when a CWV forecast is tradable versus when uncertainty is too high to size a position.

UK CWV Forecast Intelligence for Gas Trading Desks

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Track CWV Risk

Anticipate CWV changes using our forecast analyses.

Trade All 13 UK LDZs

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Forecasts

Analyze daily CWV LDZ forecast signals to optimize your cash risk positions.

Observations

Quickly assess recent CWV, temperature, wind speed, and solar radiation trends, then share clear, decision-ready weather insights with the desk in seconds.

Verification

Assess CWV forecast risk by verifying model forecast skill across CWV, temperature, wind speed, and solar radiation.

From CWV Signal to Trading Decision

Manage Risk and Opportunity

Manage UK gas demand forecast risk and opportunity across all 13 UK LDZs.

Gauge Signals and Confidence

Analyze nuances in CWV, temperature, wind speed, and solar radiation forecast signals to identify UK gas demand scenarios that imperil your gas supply.

Build Profitable Strategies

Develop gas buying strategies based on high-quality CWV forecasts.

Inside Each UK Gas Tool

Forecasts

Daily and subseasonal CWV forecasts for the UK gas transmission network.

2Leading Models

4Forecast Variables

14UK Regions

6Week Lead

Analyze CWV forecast risk across the UK NBP and all 13 LDZs.
Compare multi-model output to gauge confidence in CWV pattern transitions.
Toggle Anomaly, Change, Progression, and Probability views to read the CWV forecast in one place.
Step from Day 1 out to Week 6 to track how the UK gas demand signal evolves.

Observations

Recent observed CWV, temperature, wind, and solar to anchor UK gas demand briefings.

13UK LDZs

1National Index

4Forecast Views

DailyRefresh

Analyze recent observed CWV, temperature, wind speed, and solar radiation across the UK NBP and 13 LDZs.
Anchor every trader briefing in up-to-date observed UK gas demand context.
Compare observed CWV, temperature, wind speed, and solar radiation time series against climatology to gauge anomaly magnitude.
Quickly save PNGs of observed CWV, temperature, wind speed, and solar radiation to share with your traders.

Verification

On-demand forecast skill across CWV, temperature, wind, and solar, documented since 2018.

14Day Lead Coverage

14UK Regions

4Weather Variables

Gauge verified forecast skill to know when a UK gas demand call is tradable and when uncertainty is too high.
Brief your trader on verified forecast confidence across CWV, temperature, wind speed, and solar radiation.
Anchor every CWV, temperature, wind speed, and solar radiation call in the documented forecast skill record.
Demonstrate transparent forecast skill to the risk desk on UK gas demand.

Built for Power and Natural Gas Desks

Refined Since 2009

Continuously refined since 2009 through direct engagement with power and gas trading desks.

Bias-Corrected Forecasts

Objective, consistently structured, and historically deep CWV, temperature, wind, and solar guidance.

Transparent Forecast Skill

Transparent CWV forecast skill across the last 14 initialization dates, so the meteorologist can defend every call.

Energy Trading Focus

Every UK CWV tool is built around the workflow of an energy meteorologist on a power or gas trading desk.

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Translate UK CWV signals into clearer trading desk briefings.

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