KD4PYR MOS Compare

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GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 12/13/2025 1800 UTC
KCVG NAM MOS GUIDANCE 12/13/2025 1200 UTC

Date/Time UTC	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 15:00 Mon	12/15 18:00 Mon	12/15 21:00 Mon	12/16 00:00 Tue	12/16 03:00 Tue	12/16 06:00 Tue	12/16 12:00 Tue	12/16 18:00 Tue
Date/Time Local	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 10:00 Mon	12/15 13:00 Mon	12/15 16:00 Mon	12/15 19:00 Mon	12/15 22:00 Mon	12/16 01:00 Tue	12/16 07:00 Tue	12/16 13:00 Tue
GFS-N/X	--	--					3				13				7				28			18
NAM-N/X							10				19				6				31	--		18	--
GFS-TMP	--	--	21	20	17	13	10	3	9	13	10	10	9	8	9	12	23	28	22	23	22	20	38
NAM-TMP	28	26	22	20	17	14	11	14	16	17	16	10	9	9	9	17	26	31	27	--	24	20	--
GFS-DPT	--	--	20	16	13	9	5	2	5	5	4	4	4	3	4	8	11	12	12	13	14	14	21
NAM-DPT	26	23	18	13	9	5	2	2	2	2	3	3	2	2	3	5	8	10	10	--	10	10	--
GFS-CLD	--	--	OV	OV	OV	OV	BK	OV	OV	SC	FW	SC	FW	CL	FW	FW	FW	FW	CL	CL	CL	CL	FW
NAM-CLD	OV	OV	OV	OV	OV	SC	OV	OV	BK	BK	BK	SC	SC	SC	SC	CL	CL	CL	SC	--	CL	CL	--
GFS-WDR	--	--	33	32	32	31	30	30	31	31	30	25	26	20	19	20	21	22	23	22	21	18	19
NAM-WDR	28	31	33	33	33	31	30	30	31	30	31	28	28	23	20	20	21	21	24	--	23	20	--
GFS-WSP	--	--	10	11	12	11	10	12	11	10	07	03	04	03	04	08	11	11	09	06	05	05	09
NAM-WSP	08	07	10	09	11	09	09	11	11	11	06	06	03	04	05	08	12	15	08	--	06	03	--
GFS-P06	--	--			78		4		0		0		0		0		0		0		1	0	3
NAM-P06			00		78		8		0		0		0		0		0		0	--	0	1	--
GFS-P12	--	--					78				0				0				0			1
NAM-P12							78				0				0				0	--		1	--
GFS-Q06	--	--			1		0		0		0		0		0		0		0		0	0	0
NAM-Q06			2		1		0		0		0		0		0		0		0	--	0	0	--
GFS-Q12	--	--					1				0				0				0			0
NAM-Q12							1				0				0				0	--		0	--
GFS-T06	--	--			0/ 9		0/ 3		0/ 2		0/ 0		0/ 5		1/ 5		0/ 2		0/ 0		0/ 0		0/ 0
NAM-T06			0/ 7		0/14		0/ 3		0/ 5		0/ 0		0/ 9		0/ 5		0/ 0		0/ 0	--		0/ 0	--
GFS-T12	--	--							0/ 9				0/ 7				1/ 5				2/ 5		0/ 4
NAM-T12					0/14				0/ 5				0/ 9				1/ 5			--	0/12		--
GFS-POZ	--	--	0	0	0	1	0	0	1	1	3	1	1	1	1	0	0	3	11	20	21	19	17
NAM-POZ	3	0	2	2	2	1	0	0	2	2	2	2	1	1	1	4	7	13	18	--	20	19	--
GFS-POS	--	--	00	00	00	99	00	00	99	99	97	99	99	99	99	99	96	96	89	79	76	55	27
NAM-POS	96	00	98	98	98	99	98	99	96	98	97	98	98	98	98	95	92	80	76	--	61	60	--
GFS-TYP	--	--	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	R
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							4								0					--		0	--
GFS-CIG	--	--	4	4	4	4	4	4	5	8	8	8	8	8	8	8	8	8	8	8	8	8	8
NAM-CIG	3	3	5	6	6	8	6	6	6	6	8	8	8	8	8	8	8	8	8	--	8	8	--
GFS-VIS	--	--	3	3	6	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	2	2	3	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	--	7	7	--
GFS-OBV	--	--	BR	BR	BR	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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