KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 5/31/2026 0600 UTC
KCVG NAM MOS GUIDANCE 5/31/2026 0000 UTC

Date/Time UTC	5/31 06:00 Sun	5/31 09:00 Sun	5/31 12:00 Sun	5/31 15:00 Sun	5/31 18:00 Sun	5/31 21:00 Sun	6/1 00:00 Mon	6/1 03:00 Mon	6/1 06:00 Mon	6/1 09:00 Mon	6/1 12:00 Mon	6/1 15:00 Mon	6/1 18:00 Mon	6/1 21:00 Mon	6/2 00:00 Tue	6/2 03:00 Tue	6/2 06:00 Tue	6/2 09:00 Tue	6/2 12:00 Tue	6/2 15:00 Tue	6/2 18:00 Tue	6/3 00:00 Wed	6/3 06:00 Wed
Date/Time Local	5/31 02:00 Sun	5/31 05:00 Sun	5/31 08:00 Sun	5/31 11:00 Sun	5/31 14:00 Sun	5/31 17:00 Sun	5/31 20:00 Sun	5/31 23:00 Sun	6/1 02:00 Mon	6/1 05:00 Mon	6/1 08:00 Mon	6/1 11:00 Mon	6/1 14:00 Mon	6/1 17:00 Mon	6/1 20:00 Mon	6/1 23:00 Mon	6/2 02:00 Tue	6/2 05:00 Tue	6/2 08:00 Tue	6/2 11:00 Tue	6/2 14:00 Tue	6/2 20:00 Tue	6/3 02:00 Wed
GFS-X/N	--	--					80				58				81				56			77
NAM-X/N							81				57				77				54	--		76	--
GFS-TMP	--	--	57	69	76	79	74	67	64	61	63	73	78	79	75	67	64	60	60	70	75	72	62
NAM-TMP	62	58	59	71	78	79	73	67	63	60	60	68	73	75	70	65	61	57	58	--	73	68	--
GFS-DPT	--	--	45	46	46	47	49	49	49	50	52	51	49	48	48	49	49	48	49	45	43	44	46
NAM-DPT	47	47	49	51	48	47	49	55	54	53	53	50	50	49	49	50	50	49	50	--	47	45	--
GFS-CLD	--	--	SC	SC	CL	CL	BK	BK	OV	OV	OV	BK	SC	BK	BK	BK	SC	SC	FW	CL	FW	FW	CL
NAM-CLD	CL	CL	FW	SC	CL	CL	CL	BK	BK	BK	BK	BK	SC	SC	BK	FW	FW	CL	CL	--	SC	CL	--
GFS-WDR	--	--	07	08	04	02	03	01	03	04	05	07	05	04	05	06	05	04	04	04	04	04	06
NAM-WDR	06	06	07	10	03	35	01	34	31	34	03	06	03	35	03	04	05	03	03	--	04	04	--
GFS-WSP	--	--	08	06	06	06	05	05	04	04	04	05	07	08	11	07	07	07	08	14	17	17	07
NAM-WSP	10	07	07	05	04	05	03	02	02	02	02	04	04	06	08	08	09	10	08	--	13	15	--
GFS-P06	--	--			2		0		4		4		1		0		3		1		0	0	1
NAM-P06			3		2		1		1		3		3		0		0		0	--	0	0	--
GFS-P12	--	--					4				6				5				6			0
NAM-P12							2				5				3				1	--		0	--
GFS-Q06	--	--			0		0		0		0		0		0		0		0		0	0	0
NAM-Q06			0		0		0		0		0		0		0		0		0	--	0	0	--
GFS-Q12	--	--					0				0				0				0			0
NAM-Q12							0				0				0				0	--		0	--
GFS-T06	--	--			0/ 0		0/ 0		1/ 0		3/ 0		2/ 2		4/ 0		3/ 5		2/ 0		2/ 2		0/ 1
NAM-T06			0/ 0		0/ 0		0/ 0		1/ 0		2/ 0		2/ 2		1/ 3		0/ 4		1/ 1	--		0/ 9	--
GFS-T12	--	--							1/ 1				4/ 4				4/ 6				2/ 2		0/ 6
NAM-T12					0/ 0				8/ 0				2/ 2				2/ 8			--	1/ 3		--
GFS-POZ	--	--	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1
NAM-POZ	0	0	1	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	1	0	0	0	0	0	0	0	3	0
NAM-POS	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	1	0	5	--	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	7	7	8	8	8	8	8	8	8	8	8	8	8	8
NAM-CIG	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	--	8	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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