GFA

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ft MSL

Station Plot

TAF Station Plot

Flight Cat Dots

LIFR	IFR	MVFR	VFR
non-ceiling clouds below 3000 ft

PIREP
Turb					Ice						Other
					\|					\|
NIL	LGT	MOD	SEV	LLWS		NIL	LGT	MOD	SEV

Weather Symbols

Radar (dBZ)

5	15		25		35		45		55		65

Radar Echo Tops (kft)

5		15		25		35		45		55		65

Lightning (event density per 5 min)
No Coverage over Alaska

10		20		30		40		50		60		70

Wind Speed (kt)

	10		20		30		40		80		120		160

Wind Barbs

Calm	15kt	60kt	25G30kt

Sky Coverage <FL180

FEW	SCT	BKN	OVC

Cloud Top (MSL x100 ft)

	060		120		180		300		420

Cloud Base (MSL x100 ft)

	060		120		180

Sky Cover <FL180

SKC	FEW	SCT	BKN	OVC

Flight Cat

LIFR	IFR	MVFR

Ceiling (ft AGL)

	100		300		500		700		1000		2000

Visibility (SM)

	0.25		0.5		1		2		3		4

Density Alt Dev (ft)

	500		1000		1500		2000		2500		3000		3500		4000

Precipitation							Weather
Chance
Likely					Severe
	Rain	Snow	Mix	Ice	TS		Haze	Smoke	Fog	Dust

Thunderstorm

ISOL	SCT	NUM

Reflectivity

	5		10		15		20		25		30		35		40		45		50		55		60		65		70

Reflectivity
Rain
Freezing Rain
Ice Pellets
Snow
		5		10		15		20		25		30		35		40		45		50		55		60		65		70

TCF
Coverage		Lines

Sparse 25-39%	Medium 40-74%	Solid 75-100%

Echo Tops (hft)
<40 dBz

≥40 dBz

<25	25-30	30-35	35-40	>40

SPC Convective Outlook

TSTM	MRGL	SLGT	ENH	MDT	HIGH

Winter Weather
Chance
Likely
	Snow	Mix	Ice

Icing Severity

Trace	Light	Mod	Heavy

Icing Severity with SLD

Trace	Light	Mod	Heavy	SLD

Icing Probability (%)

	5		15		25		35		45		55		65		75

Freezing Level (MSL x100ft)

	010		030		050		070		090		110		130		150		170

RAP Icing (%)

	10		20		30		40		50		60		70		80		90		100

Temperature
C	-70		-65		-60		-55		-50		-45		-40		-35		-30		-25		-20		-15		-10		-5		0		5		10		15		20		25		30		35

F	-94		-85		-76		-67		-58		-49		-40		-31		-22		-13		-4		5		14		23		32		41		50		59		68		77		86		95

GTG (Eddy Dissipation Rate × 100)
					Lgt				Moderate														Severe																					Ex		Heavy
				Lgt			Moderate											Severe																		Extreme										Medium
			L		Moderate									Severe															Extreme																	Light
	10					20					30					40					50					60					70					80					90				98

LLWS (/s)

0	.06		.12		.18		.24		.3

Terrain

Below Surface

SIGMET/CWA

G-AIRMET/AIRMET

NWS Warnings