KD4PYR MOS Compare

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GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 12/13/2025 0000 UTC
KCVG NAM MOS GUIDANCE 12/13/2025 0000 UTC

Date/Time UTC	12/13 06:00 Sat	12/13 09:00 Sat	12/13 12:00 Sat	12/13 15:00 Sat	12/13 18:00 Sat	12/13 21:00 Sat	12/14 00:00 Sun	12/14 03:00 Sun	12/14 06:00 Sun	12/14 09:00 Sun	12/14 12:00 Sun	12/14 15:00 Sun	12/14 18:00 Sun	12/14 21:00 Sun	12/15 00:00 Mon	12/15 03:00 Mon	12/15 06:00 Mon	12/15 09:00 Mon	12/15 12:00 Mon	12/15 18:00 Mon	12/16 00:00 Tue
Date/Time Local	12/13 01:00 Sat	12/13 04:00 Sat	12/13 07:00 Sat	12/13 10:00 Sat	12/13 13:00 Sat	12/13 16:00 Sat	12/13 19:00 Sat	12/13 22:00 Sat	12/14 01:00 Sun	12/14 04:00 Sun	12/14 07:00 Sun	12/14 10:00 Sun	12/14 13:00 Sun	12/14 16:00 Sun	12/14 19:00 Sun	12/14 22:00 Sun	12/15 01:00 Mon	12/15 04:00 Mon	12/15 07:00 Mon	12/15 13:00 Mon	12/15 19:00 Mon
GFS-X/N							29				4				11				7		29
NAM-X/N							34				8				19				7		35
GFS-TMP	30	29	28	29	27	25	22	18	15	13	10	4	8	11	7	8	9	9	9	24	23
NAM-TMP	31	30	30	30	31	29	24	18	15	12	9	13	16	18	16	13	12	10	9	29	30
GFS-DPT	26	24	23	25	25	25	22	17	14	11	6	3	4	5	3	3	4	4	5	9	12
NAM-DPT	28	27	26	24	24	21	17	11	7	4	1	1	1	1	1	3	4	4	4	7	8
GFS-CLD	OV	OV	OV	OV	OV	OV	OV	OV	OV	BK	SC	BK	OV	BK	CL	SC	FW	FW	SC	FW	CL
NAM-CLD	OV	OV	OV	OV	OV	OV	OV	OV	BK	SC	SC	OV	SC	FW	CL	FW	SC	SC	FW	CL	FW
GFS-WDR	24	26	26	28	29	31	31	32	32	31	30	31	31	31	30	27	27	22	19	21	22
NAM-WDR	25	26	26	25	27	30	33	32	32	31	30	30	31	30	32	29	28	23	20	20	22
GFS-WSP	04	06	07	08	09	09	10	11	12	10	09	12	11	10	07	04	03	04	04	11	06
NAM-WSP	05	07	07	07	06	07	11	11	11	10	10	12	13	13	07	05	04	03	05	11	12
GFS-P06			0		32		85		63		7		0		0		0		0	0	0
NAM-P06			1		43		97		41		6		0		0		0		0	0	0
GFS-P12							85				63				0				0		0
NAM-P12							97				48				4				0		0
GFS-Q06			0		0		1		1		0		0		0		0		0	0	0
NAM-Q06			0		0		2		0		0		0		0		0		0	0	0
GFS-Q12							2				1				0				0		0
NAM-Q12							2				1				0				0		0
GFS-T06			0/ 8		0/ 0		0/ 0		0/10		0/ 2		0/ 4		0/ 0		0/12		0/ 2		0/ 0
NAM-T06			0/ 2		0/ 1		1/ 2		0/15		0/ 7		0/ 0		0/ 0		0/ 9		0/ 4		0/ 0
GFS-T12					0/ 9				0/19				0/ 4				0/20			0/ 7
NAM-T12					0/ 2				1/15				0/ 7				0/ 9			0/ 4
GFS-POZ	1	0	0	2	1	2	0	3	1	0	1	0	0	1	2	2	1	1	1	0	10
NAM-POZ	1	0	0	0	1	1	3	3	2	2	1	0	0	1	2	2	2	2	1	8	18
GFS-POS	90	94	97	99	99	98	00	98	99	99	99	00	98	99	98	97	99	97	97	99	90
NAM-POS	92	98	97	99	99	99	97	97	98	98	99	98	99	97	98	96	96	97	99	87	73
GFS-TYP	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	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											2								0
NAM-SNW											2								0
GFS-CIG	4	4	4	4	4	4	3	4	4	8	8	5	5	6	8	8	8	8	8	8	8
NAM-CIG	5	4	4	4	2	3	4	6	5	8	8	6	8	8	8	8	8	8	8	8	8
GFS-VIS	7	7	7	7	4	4	4	5	7	7	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	7	7	7	6	5	1	3	7	7	7	7	7	7	7	7	7	7	7	7	7	7
GFS-OBV	N	N	N	N	N	BR	BR	N	N	N	N	N	N	N	N	N	N	N	N	N	N
NAM-OBV	N	N	N	N	N	FG	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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