KTCM TAF

Terminal aerodrome forecast for McChord Field (Joint Base Lewis-McChord) (TCM · KTCM), Tacoma, WA. Issued 21 Sep 2026 0500Z, valid 0500Z to 1100Z, decoded period by period below. · Open on the map

All of McChord Field (Joint Base Lewis-McChord) — runways, frequencies, charts and live weather

TAF issued 21 Sep 2026 0500Z

valid 0500Z to 1100Z

TAF KTCM 210500Z 2105/2211 34005KT 9999 SKC QNH2997INS BECMG 2108/2109 25005KT 3200 BR SCT015 QNH2998INS TEMPO 2111/2116 0800 FG VV005 BECMG 2115/2116 22005KT 4800 BR OVC008 QNH3001INS BECMG 2117/2118 24008KT 9999 NSW SCT010 SCT200 QNH2997INS BECMG 2204/2205 22006KT 9999 BKN025 OVC035 QNH3001INS TX21/2200Z TN08/2113Z

Times are UTC (Zulu), as they appear in the bulletin.

Period by period

Period (UTC)	Change	Wind	Vis	Ceiling	Sky	Cat
0500Z to 0800Z	Initial	340° at 5 kt	6+ SM	Clear	Clear below 12,000 ft	VFR
0800Z to 1500Z	BECMG	250° at 5 kt	1.99 SM	Clear	Scattered at 1,500 ft AGL	IFR
1100Z to 1600Z	TEMPO	Calm	0.5 SM	Clear	Sky obscured	LIFR
1500Z to 1700Z	BECMG	220° at 5 kt	2.98 SM	800 ft OVC	Overcast at 800 ft AGL	IFR
1700Z to 0400Z	BECMG	240° at 8 kt	6+ SM	Clear	Scattered at 1,000 ft AGL, Scattered at 20,000 ft AGL	VFR
0400Z to 1100Z	BECMG	220° at 6 kt	6+ SM	2,500 ft BKN	Broken at 2,500 ft AGL, Overcast at 3,500 ft AGL	MVFR

What the change groups mean

BECMG: Becoming — a gradual change over the stated window.
TEMPO: Temporary — expected for less than half the period, in spells under an hour.

What the categories mean

VFR: Visual flight rules — ceiling above 3,000 ft and visibility greater than 5 SM.
IFR: Instrument flight rules — ceiling 500 to 999 ft and/or visibility 1 to less than 3 SM.
LIFR: Low IFR — ceiling below 500 ft and/or visibility less than 1 SM.
MVFR: Marginal VFR — ceiling 1,000 to 3,000 ft and/or visibility 3 to 5 SM.

Frequently asked

What is the current TAF for KTCM?

The forecast issued 21 Sep 2026 0500Z for McChord Field (Joint Base Lewis-McChord) reads: TAF KTCM 210500Z 2105/2211 34005KT 9999 SKC QNH2997INS BECMG 2108/2109 25005KT 3200 BR SCT015 QNH2998INS TEMPO 2111/2116 0800 FG VV005 BECMG 2115/2116 22005KT 4800 BR OVC008 QNH3001INS BECMG 2117/2118 24008KT 9999 NSW SCT010 SCT200 QNH2997INS BECMG 2204/2205 22006KT 9999 BKN025 OVC035 QNH3001INS TX21/2200Z TN08/2113Z

How far ahead does a TAF forecast?

A TAF covers a 24-hour period at most airports and 30 hours at larger ones, issued four times a day at 0000Z, 0600Z, 1200Z and 1800Z. It describes conditions within roughly 5 statute miles of the airport, not the surrounding area.

What do FM, BECMG and TEMPO mean?

FM (from) marks a rapid, permanent change at the stated time. BECMG (becoming) marks a gradual change over the stated window. TEMPO marks conditions expected for less than half the period, in spells of under an hour each. PROB30 and PROB40 give the probability of the conditions that follow.

More about KTCM

Forecasts from the US National Weather Service Aviation Weather Center. Times are UTC (Zulu). For planning and education only — always confirm with an official preflight briefing.

Something here wrong or out of date? Report a data problem.