KD4PYR MOS Compare

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GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 1/20/2026 0000 UTC
KCVG NAM MOS GUIDANCE 1/20/2026 0000 UTC

Date/Time UTC	1/20 06:00 Tue	1/20 09:00 Tue	1/20 12:00 Tue	1/20 15:00 Tue	1/20 18:00 Tue	1/20 21:00 Tue	1/21 00:00 Wed	1/21 03:00 Wed	1/21 06:00 Wed	1/21 09:00 Wed	1/21 12:00 Wed	1/21 15:00 Wed	1/21 18:00 Wed	1/21 21:00 Wed	1/22 00:00 Thu	1/22 03:00 Thu	1/22 06:00 Thu	1/22 09:00 Thu	1/22 12:00 Thu	1/22 18:00 Thu	1/23 00:00 Fri
Date/Time Local	1/20 01:00 Tue	1/20 04:00 Tue	1/20 07:00 Tue	1/20 10:00 Tue	1/20 13:00 Tue	1/20 16:00 Tue	1/20 19:00 Tue	1/20 22:00 Tue	1/21 01:00 Wed	1/21 04:00 Wed	1/21 07:00 Wed	1/21 10:00 Wed	1/21 13:00 Wed	1/21 16:00 Wed	1/21 19:00 Wed	1/21 22:00 Wed	1/22 01:00 Thu	1/22 04:00 Thu	1/22 07:00 Thu	1/22 13:00 Thu	1/22 19:00 Thu
GFS-X/N							26				19				40				30		42
NAM-X/N							25				15				37				24		32
GFS-TMP	13	12	10	14	22	25	21	19	20	22	23	31	36	37	37	36	35	34	32	38	35
NAM-TMP	9	7	6	13	21	25	23	17	15	16	20	29	33	34	35	36	33	29	25	29	23
GFS-DPT	-3	-2	-3	-5	-5	-5	-2	3	6	9	13	18	26	31	31	31	29	28	26	21	18
NAM-DPT	-4	-5	-5	-7	-8	-8	-5	-2	-2	0	4	13	18	22	24	28	26	22	19	13	7
GFS-CLD	SC	SC	CL	CL	CL	FW	CL	SC	OV	BK	OV	OV	OV	OV	OV	OV	BK	SC	SC	SC	OV
NAM-CLD	FW	OV	FW	CL	CL	CL	BK	OV	BK	BK	OV	OV	OV	OV	OV	OV	OV	OV	BK	FW	FW
GFS-WDR	27	26	26	26	25	24	19	17	17	18	18	20	21	22	21	23	24	24	24	26	29
NAM-WDR	28	28	26	26	24	22	18	18	17	17	18	20	22	23	24	24	23	24	27	28	32
GFS-WSP	07	07	07	09	09	09	05	06	07	08	11	15	15	15	13	14	13	10	08	09	07
NAM-WSP	09	10	06	09	08	08	06	09	10	10	13	17	18	16	11	11	11	12	13	13	06
GFS-P06			0		2		0		0		7		33		34		6		4	4	5
NAM-P06			1		2		1		2		6		56		43		8		10	13	8
GFS-P12							2				7				35				9		6
NAM-P12							2				7				58				20		14
GFS-Q06			0		0		0		0		0		0		0		0		0	0	0
NAM-Q06			0		0		0		0		0		1		1		0		0	0	0
GFS-Q12							0				0				0				0		0
NAM-Q12							0				0				1				0		0
GFS-T06			0/11		0/ 5		0/ 8		0/ 4		0/ 7		0/10		1/17		1/13		0/ 9		0/ 4
NAM-T06			0/ 8		0/ 7		0/ 6		0/ 8		0/ 7		0/ 9		0/25		0/32		0/12		0/13
GFS-T12					0/11				0/13				1/10				3/18			0/ 9
NAM-T12					0/ 8				0/10				0/ 9				0/32			0/12
GFS-POZ	3	3	2	1	1	1	2	0	1	1	6	13	11	3	0	0	0	1	0	3	2
NAM-POZ	3	3	4	1	1	3	3	3	2	6	11	15	15	7	4	2	2	2	2	2	4
GFS-POS	94	97	98	99	99	99	98	00	99	99	91	86	71	59	72	48	57	81	88	74	84
NAM-POS	94	97	96	99	99	97	97	98	97	92	89	85	86	90	96	96	96	97	96	98	94
GFS-TYP	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	R	S	S	S	S	S
NAM-TYP	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S
GFS-SNW											0								0
NAM-SNW											0								1
GFS-CIG	8	8	8	8	8	8	8	8	7	8	8	6	4	3	3	5	7	8	8	8	8
NAM-CIG	8	7	8	8	8	8	8	7	8	8	6	6	4	4	5	5	5	5	8	8	8
GFS-VIS	7	7	7	7	7	7	7	7	7	7	7	7	5	4	5	7	7	7	7	7	7
NAM-VIS	7	7	7	7	7	7	7	7	7	7	7	7	4	5	7	7	7	7	7	7	7
GFS-OBV	N	N	N	N	N	N	N	N	N	N	N	N	HZ	BR	BR	N	N	N	N	N	N
NAM-OBV	N	N	N	N	N	N	N	N	N	N	N	N	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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