TCF vs ECFP: Reading the Airline System's Convective Forecasts

TCF and ECFP are products built for traffic flow managers and airline dispatch, not as a pilot's go/⁠no‑go product. They help a GA pilot see where the airline system expects storm trouble. They are not a substitute for SIGMETs, Convective SIGMETs, TAFs, radar or a Flight Service briefing.

TCF (TFM Convective Forecast)

The TCF is issued by the Aviation Weather Center. From March 1 to October 31 it is collaborated by AWC meteorologists, AWC staff at the FAA Command Center (ATCSCC), CWSUs at the ARTCCs, airlines and other authorized participants. From November 1 to February 28 it is automated, with no collaboration.

It is issued every 2 hours, 24/7, 30 minutes before the nominal issuance time. There are no amendments. Valid times are 4, 6 and 8 hours after issuance. Coverage is FIRs covering the lower 48 states and adjacent coastal waters, plus part of southern Canada.

Area criteria: composite reflectivity at least 40 dBZ, echo tops at or above FL250, coverage at least 25% of the polygon, and forecaster confidence at least 50%. Line criteria: at least 40 dBZ, at least 100 NM long, 75% or more linear coverage, tops at or above FL250, and confidence at least 50%. All criteria must be met. Convection below them is not shown. A blank TCF does not mean no thunderstorms.

Everything shown is high confidence (50 to 100%). Coverage hatching: broken 25 to 39%, striped 40 to 74%, and a solid purple line for lines with 75 to 100% coverage. Tops come in four classes: 290, 340, 390 and above 400.

Audience: traffic flow managers at the FAA ATCSCC and ARTCC Traffic Management Units, and airline and corporate flight operations centers. Stated purpose: "Authoritative source of convective weather forecast information for Traffic Flow Management strategic planning." FAA TFM training is at tfmlearning.faa.gov.

eTCF (Extended TCF)

The Extended TCF is a model blend that uses the same criteria as the TCF. It is issued every 2 hours and is valid every 2 hours from 10 to 30 hours after issuance. It bridges TCF and ECFP.

ECFP (Extended Convective Forecast Product)

The ECFP is issued by AWC. It is fully automated: a model probability of thunderstorms only. The product is not a TCF forecast. It is issued around 01, 07, 13 and 19 UTC (four times a day), available 24/7. Coverage is CONUS.

Probability contours are drawn at 30, 50 and 70%: blue hash 30 to 49%, solid orange line 50 to 69%, solid magenta fill above 70%. Stated purpose: a "quick-look" planning tool for where thunderstorm probability is greatest, supporting planning beyond the 8-hour TCF. Range covers later periods, roughly days 2 through 4 per AWC's product page. The FAA handbook describes it as covering up to about 3 days.

Plain-language takeaways

• The TCF maps only organized, tall, high-confidence storms that would disrupt jet traffic, 4 to 8 hours out.
• The ECFP is an automated probability map for later days.
• A blank TCF does not mean no storms.
• The ECFP shows probability, not coverage or tops.
• Both were built for traffic managers and airline dispatch.