KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 12/27/2025 1800 UTC
KCVG NAM MOS GUIDANCE 12/27/2025 1200 UTC

Date/Time UTC	12/27 18:00 Sat	12/27 21:00 Sat	12/28 00:00 Sun	12/28 03:00 Sun	12/28 06:00 Sun	12/28 09:00 Sun	12/28 12:00 Sun	12/28 15:00 Sun	12/28 18:00 Sun	12/28 21:00 Sun	12/29 00:00 Mon	12/29 03:00 Mon	12/29 06:00 Mon	12/29 09:00 Mon	12/29 12:00 Mon	12/29 15:00 Mon	12/29 18:00 Mon	12/29 21:00 Mon	12/30 00:00 Tue	12/30 03:00 Tue	12/30 06:00 Tue	12/30 12:00 Tue	12/30 18:00 Tue
Date/Time Local	12/27 13:00 Sat	12/27 16:00 Sat	12/27 19:00 Sat	12/27 22:00 Sat	12/28 01:00 Sun	12/28 04:00 Sun	12/28 07:00 Sun	12/28 10:00 Sun	12/28 13:00 Sun	12/28 16:00 Sun	12/28 19:00 Sun	12/28 22:00 Sun	12/29 01:00 Mon	12/29 04:00 Mon	12/29 07:00 Mon	12/29 10:00 Mon	12/29 13:00 Mon	12/29 16:00 Mon	12/29 19:00 Mon	12/29 22:00 Mon	12/30 01:00 Tue	12/30 07:00 Tue	12/30 13:00 Tue
GFS-N/X	--	--					50				69				26				29			16
NAM-N/X							51				69				23				27	--		10	--
GFS-TMP	--	--	50	50	52	53	55	61	66	67	64	61	55	47	36	26	26	27	25	23	20	17	26
NAM-TMP	48	49	47	51	52	54	56	63	66	65	62	59	50	40	30	23	25	23	19	--	16	12	--
GFS-DPT	--	--	46	47	48	51	54	58	59	59	58	56	49	40	28	17	15	15	15	14	11	10	10
NAM-DPT	43	42	42	42	45	48	52	58	60	60	59	52	42	29	19	15	13	10	7	--	3	2	--
GFS-CLD	--	--	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	BK	CL	SC	SC	CL	CL
NAM-CLD	BK	BK	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	FW	--	SC	FW	--
GFS-WDR	--	--	10	12	14	16	18	18	19	20	21	22	27	27	27	26	28	28	28	29	29	28	28
NAM-WDR	09	10	12	12	13	14	16	19	20	20	21	20	26	27	26	26	26	27	28	--	28	28	--
GFS-WSP	--	--	07	07	06	07	08	11	15	20	17	24	22	22	21	21	20	19	16	17	14	11	13
NAM-WSP	06	07	07	09	09	07	06	08	11	15	15	18	19	19	21	22	23	21	19	--	14	12	--
GFS-P06	--	--			0		10		3		23		93		43		0		1		0	0	0
NAM-P06			0		1		46		57		40		89		48		21		0	--	2	0	--
GFS-P12	--	--					10				24				00				5			0
NAM-P12							46				57				90				21	--		7	--
GFS-Q06	--	--			0		0		0		0		3		1		0		0		0	0	0
NAM-Q06			0		0		1		1		0		3		1		0		0	--	0	0	--
GFS-Q12	--	--					0				0				3				0			0
NAM-Q12							0				1				3				0	--		0	--
GFS-T06	--	--			0/ 0		2/ 3		0/ 0		5/19		6/32		1/ 3		0/11		0/ 5		0/ 7		0/ 5
NAM-T06			0/ 4		0/ 5		5/ 0		5/ 0		3/10		12/25		1/11		0/10		0/ 4	--		0/ 5	--
GFS-T12	--	--							2/ 3				8/32				1/16				1/12		0/ 7
NAM-T12					0/ 5				8/ 0				12/25				1/11			--	1/11		--
GFS-POZ	--	--	0	0	0	0	0	1	0	1	2	4	1	2	2	0	0	1	3	0	1	2	0
NAM-POZ	0	1	2	1	0	0	1	1	1	1	2	1	2	2	9	1	1	2	3	--	3	2	--
GFS-POS	--	--	0	0	0	0	0	0	1	1	1	0	21	81	98	00	00	99	95	00	96	98	99
NAM-POS	0	0	0	0	0	1	1	1	1	1	1	1	20	58	82	98	98	96	97	--	94	98	--
GFS-TYP	--	--	R	R	R	R	R	R	R	R	R	R	R	S	S	S	S	S	S	S	S	S	S
NAM-TYP	R	R	R	R	R	R	R	R	R	R	R	R	R	S	S	S	S	S	S	--	S	S	--
GFS-SNW	--	--													0							0
NAM-SNW							0								0					--		0	--
GFS-CIG	--	--	5	5	5	4	3	3	4	6	5	5	4	5	6	5	6	6	8	6	8	8	8
NAM-CIG	2	5	5	4	4	2	3	3	4	4	4	4	4	5	6	6	6	6	8	--	8	8	--
GFS-VIS	--	--	7	7	7	7	7	5	7	7	7	5	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	5	5	6	6	5	5	4	4	5	6	5	3	5	7	7	7	7	7	7	--	7	7	--
GFS-OBV	--	--	N	N	N	N	N	BR	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N
NAM-OBV	BR	HZ	HZ	BR	BR	BR	BR	BR	BR	N	BR	BR	BR	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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