KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 5/17/2026 0600 UTC
KCVG NAM MOS GUIDANCE 5/17/2026 0000 UTC

Date/Time UTC	5/17 06:00 Sun	5/17 09:00 Sun	5/17 12:00 Sun	5/17 15:00 Sun	5/17 18:00 Sun	5/17 21:00 Sun	5/18 00:00 Mon	5/18 03:00 Mon	5/18 06:00 Mon	5/18 09:00 Mon	5/18 12:00 Mon	5/18 15:00 Mon	5/18 18:00 Mon	5/18 21:00 Mon	5/19 00:00 Tue	5/19 03:00 Tue	5/19 06:00 Tue	5/19 09:00 Tue	5/19 12:00 Tue	5/19 15:00 Tue	5/19 18:00 Tue	5/20 00:00 Wed	5/20 06:00 Wed
Date/Time Local	5/17 02:00 Sun	5/17 05:00 Sun	5/17 08:00 Sun	5/17 11:00 Sun	5/17 14:00 Sun	5/17 17:00 Sun	5/17 20:00 Sun	5/17 23:00 Sun	5/18 02:00 Mon	5/18 05:00 Mon	5/18 08:00 Mon	5/18 11:00 Mon	5/18 14:00 Mon	5/18 17:00 Mon	5/18 20:00 Mon	5/18 23:00 Mon	5/19 02:00 Tue	5/19 05:00 Tue	5/19 08:00 Tue	5/19 11:00 Tue	5/19 14:00 Tue	5/19 20:00 Tue	5/20 02:00 Wed
GFS-X/N	--	--					86				65				89				67			84
NAM-X/N							85				64				86				67	--		83	--
GFS-TMP	--	--	66	77	83	84	81	74	70	68	71	82	86	87	82	75	71	69	72	79	81	76	68
NAM-TMP	63	62	64	74	82	84	76	73	70	67	68	78	83	84	79	73	71	69	70	--	80	76	--
GFS-DPT	--	--	56	58	58	58	58	60	60	60	62	62	61	61	61	61	61	62	63	63	63	61	59
NAM-DPT	62	61	60	63	63	62	62	63	62	61	62	64	63	62	62	62	62	62	63	--	66	67	--
GFS-CLD	--	--	BK	SC	SC	BK	FW	SC	SC	CL	CL	CL	SC	BK	BK	BK	BK	BK	BK	BK	OV	OV	OV
NAM-CLD	OV	OV	BK	SC	SC	SC	BK	SC	FW	SC	FW	FW	BK	BK	OV	OV	BK	BK	BK	--	OV	BK	--
GFS-WDR	--	--	18	20	20	19	17	16	17	17	19	20	20	20	20	20	18	17	19	21	21	22	21
NAM-WDR	19	18	18	19	21	19	17	17	18	19	19	21	20	20	20	21	19	19	19	--	20	20	--
GFS-WSP	--	--	05	10	12	11	06	05	05	06	07	13	15	13	06	05	06	08	10	13	15	07	07
NAM-WSP	06	07	06	07	11	11	07	06	06	07	07	12	13	12	08	07	07	07	09	--	13	08	--
GFS-P06	--	--			2		0		0		0		1		2		4		13		29	41	48
NAM-P06			9		2		3		2		7		6		11		20		14	--	17	12	--
GFS-P12	--	--					2				0				3				18			46
NAM-P12							3				7				13				30	--		17	--
GFS-Q06	--	--			0		0		0		0		0		0		0		0		0	1	2
NAM-Q06			0		0		0		0		0		0		0		0		0	--	0	0	--
GFS-Q12	--	--					0				0				0				0			1
NAM-Q12							0				0				0				0	--		0	--
GFS-T06	--	--			2/ 0		8/ 5		11/10		10/ 2		0/ 3		12/17		6/ 9		8/ 2		16/ 5		36/ 7
NAM-T06			7/ 0		4/ 2		10/13		10/19		4/ 4		5/ 7		23/25		23/13		7/ 3	--		17/19	--
GFS-T12	--	--							11/10				10/ 5				14/17				24/ 6		58/17
NAM-T12					7/ 2				10/19				8/ 8				34/27			--	19/ 6		--
GFS-POZ	--	--	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
NAM-POZ	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	--	0	0	--
GFS-POS	--	--	0	0	0	0	1	0	0	0	0	0	0	2	1	0	0	0	0	0	0	0	0
NAM-POS	0	0	0	0	0	2	0	0	0	0	0	0	0	0	0	0	0	0	1	--	0	0	--
GFS-TYP	--	--	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R
NAM-TYP	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	R	--	R	R	--
GFS-SNW	--	--									0								0
NAM-SNW											0								0	--			--
GFS-CIG	--	--	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	7	8	6
NAM-CIG	8	7	8	8	8	8	8	8	8	8	8	8	8	8	7	8	8	8	8	--	7	8	--
GFS-VIS	--	--	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	--	7	7	--
GFS-OBV	--	--	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N
NAM-OBV	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	--	N	N	--

Entries of "--" indicate that the current model run does not include forecast data for the time period.

Descriptions of MOS Elements

DT = The day of the month, denoted by the standard three or four letter abbreviation
HR = Hour of the day in UTC time. This is the hour at which the forecast is valid, or if the forecast is valid for a period, the end of the forecast period.
N/X = nighttime minimum/daytime maximum surface temperatures.
TMP = surface temperature valid at that hour.
DPT = surface dewpoint valid at that hour.
CLD = forecast categories of total sky cover valid at that hour.
WDR = forecasts of the 10-meter wind direction at the hour, given in tens of degrees.
WSP = forecasts of the 10-meter wind speed at the hour, given in knots.
P06 = probability of precipitation (PoP) during a 6-h period ending at that time.
P12 = PoP during a 12-h period ending at that time.
Q06 = quantitative precipitation forecast (QPF) category for liquid equivalent precipitation amount during a 6-h period ending at that time.
Q12 = QPF category for liquid equivalent precipitation amount during a 12-h period ending at the indicated time.
T06 = probability of thunderstorms/conditional probability of severe thunderstorms during the 6-hr period ending at the indicated time.
T12 = probability of thunderstorms/conditional probability of severe thunderstorms during the 12-hr period ending at the indicated time.
SNW = snow fall categorical forecasts during a 24-h period ending at the indicated time.
POZ = conditional probability of freezing pcp occurring at the hour.
POS = conditional probability of snow occurring at the hour.
TYP = conditional precipitation type at the hour.
CIG = ceiling height categorical forecasts at the hour.
VIS = visibility categorical forecasts at the hour.
OBV = obstruction to vision categorical forecasts at the hour.

Definitions of Categorical Elements

QPF Categories
0	no precipitation
1	0.01 to 0.09 inches
2	0.10 to 0.24 inches
3	0.25 to 0.49 inches
4	0.50 to 0.99 inches
5	1.00 to 1.99 inches
6	2.00 inches or greater

Snow Fall Amount Categories
0	no snow or a trace expected
1	> a trace to < 2 inches
2	2 to < 4 inches
4	4 to < 6 inches
6	6 to < 8 inches
8	> = 8 inches

Visibility (VIS) Categories
1	< 1/2 miles
2	1/2 - < 1 miles
3	1 - < 2 miles
4	2 - < 3 miles
5	3 - 5 miles
6	6 miles
7	> 6 miles

Ceiling Height (CIG) Categories
1	< 200 feet
2	200 - 400 feet
3	500 - 900 feet
4	1000 - 1900 feet
5	2000 - 3000 feet
6	3100 - 6500 feet
7	6600 - 12,000 feet
8	> 12,000 feet

Cloud (CLD) Categories
CL	clear
FW	> 0 to 2 octas of total sky cover
SC	> 2 to 4 octas of total sky cover
BK	> 4 to < 8 octas of total sky cover
OV	8 octas of total sky cover or totally obscured

Precipitation Type (TYP) Categories
S	pure snow or snow grains
Z	freezing rain/drizzle, ice pellets, or
	anything mixed with freezing precip
R	pure rain/drizzle or rain mixed with snow

MAV Obstruction to Vision (OBV) Categories
N	none of the following
HZ	haze, smoke, dust
BR	mist (fog with visibility >= 5/8 mile)
FG	fog or ground fog (visibility < 5/8 mile)
BL	blowing dust, sand, snow

MOS element descriptions and definitions are adapted from the NWS Meteorological Development Laboratory's web site.

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