KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 12/25/2025 1200 UTC
KCVG NAM MOS GUIDANCE 12/25/2025 1200 UTC

Date/Time UTC	12/25 18:00 Thu	12/25 21:00 Thu	12/26 00:00 Fri	12/26 03:00 Fri	12/26 06:00 Fri	12/26 09:00 Fri	12/26 12:00 Fri	12/26 15:00 Fri	12/26 18:00 Fri	12/26 21:00 Fri	12/27 00:00 Sat	12/27 03:00 Sat	12/27 06:00 Sat	12/27 09:00 Sat	12/27 12:00 Sat	12/27 15:00 Sat	12/27 18:00 Sat	12/27 21:00 Sat	12/28 00:00 Sun	12/28 06:00 Sun	12/28 12:00 Sun
Date/Time Local	12/25 13:00 Thu	12/25 16:00 Thu	12/25 19:00 Thu	12/25 22:00 Thu	12/26 01:00 Fri	12/26 04:00 Fri	12/26 07:00 Fri	12/26 10:00 Fri	12/26 13:00 Fri	12/26 16:00 Fri	12/26 19:00 Fri	12/26 22:00 Fri	12/27 01:00 Sat	12/27 04:00 Sat	12/27 07:00 Sat	12/27 10:00 Sat	12/27 13:00 Sat	12/27 16:00 Sat	12/27 19:00 Sat	12/28 01:00 Sun	12/28 07:00 Sun
GFS-N/X							47				66				43				61		52
NAM-N/X							43				62				41				54		49
GFS-TMP	56	55	50	47	47	49	52	58	64	64	60	54	50	47	45	49	58	61	54	54	55
NAM-TMP	50	47	44	43	44	45	47	55	59	60	56	49	46	44	42	46	51	53	48	51	53
GFS-DPT	50	48	45	42	43	45	50	53	55	57	56	52	47	44	41	42	43	43	43	47	52
NAM-DPT	48	44	41	37	38	40	43	50	52	53	50	47	45	42	40	41	43	42	42	45	49
GFS-CLD	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	SC	FW	FW	FW	BK	OV	OV
NAM-CLD	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	OV	BK	OV	OV	OV	OV
GFS-WDR	03	05	06	08	09	11	15	20	23	25	27	31	33	35	05	09	12	11	10	13	18
NAM-WDR	03	05	06	08	10	12	13	17	22	24	29	31	32	34	02	08	13	13	12	13	18
GFS-WSP	07	07	10	11	09	09	09	12	14	12	10	07	07	07	05	05	05	07	07	07	07
NAM-WSP	08	07	10	12	11	10	07	08	10	11	11	10	07	06	04	04	05	05	06	07	09
GFS-P06			4		15		27		19		32		9		1		1		0	0	54
NAM-P06			10		10		33		57		30		0		1		4		4	8	13
GFS-P12							34				32				9				1		54
NAM-P12							33				57				6				4		25
GFS-Q06			0		0		0		0		0		0		0		0		0	0	1
NAM-Q06			0		0		0		1		0		0		0		0		0	0	0
GFS-Q12							0				0				0				0		1
NAM-Q12							0				1				0				0		0
GFS-T06			0/ 0		0/ 0		0/ 0		1/ 0		2/ 6		1/13		0/ 2		0/ 0		0/ 0		20/ 0
NAM-T06			0/ 1		0/ 4		0/ 0		0/ 0		0/ 5		0/15		0/ 5		0/ 4		0/ 0		1/ 1
GFS-T12					0/ 5				1/ 3				2/14				0/ 3			0/ 2
NAM-T12					0/ 4				0/ 0				0/15				0/ 5			0/11
GFS-POZ	0	0	1	0	1	1	1	1	1	1	2	2	2	2	1	1	3	2	3	2	1
NAM-POZ	0	1	2	3	2	1	1	1	1	2	2	2	2	1	1	1	1	2	3	2	2
GFS-POS	0	0	1	0	1	0	0	0	1	1	1	0	0	0	0	0	0	1	1	3	3
NAM-POS	0	0	0	0	0	0	1	1	1	0	1	0	1	2	1	2	1	1	1	1	3
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						0
NAM-SNW							0								0						0
GFS-CIG	2	2	2	2	2	2	2	5	3	3	6	6	5	6	8	8	8	8	8	6	2
NAM-CIG	2	4	5	5	3	2	2	4	3	4	5	5	5	4	4	5	8	8	5	4	4
GFS-VIS	4	5	5	5	5	5	5	5	5	5	7	7	7	1	1	6	7	7	7	7	5
NAM-VIS	5	5	7	6	5	5	5	5	5	5	7	7	7	7	2	7	7	7	7	5	5
GFS-OBV	BR	BR	BR	BR	BR	BR	BR	BR	BR	BR	N	N	N	FG	FG	BR	N	N	N	N	BR
NAM-OBV	BR	HZ	HZ	BR	BR	BR	BR	BR	BR	BR	N	N	N	N	FG	N	N	N	N	BR	BR

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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