KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 12/30/2025 1800 UTC
KCVG NAM MOS GUIDANCE 12/30/2025 1200 UTC

Date/Time UTC	12/30 18:00 Tue	12/30 21:00 Tue	12/31 00:00 Wed	12/31 03:00 Wed	12/31 06:00 Wed	12/31 09:00 Wed	12/31 12:00 Wed	12/31 15:00 Wed	12/31 18:00 Wed	12/31 21:00 Wed	1/1 00:00 Thu	1/1 03:00 Thu	1/1 06:00 Thu	1/1 09:00 Thu	1/1 12:00 Thu	1/1 15:00 Thu	1/1 18:00 Thu	1/1 21:00 Thu	1/2 00:00 Fri	1/2 03:00 Fri	1/2 06:00 Fri	1/2 12:00 Fri	1/2 18:00 Fri
Date/Time Local	12/30 13:00 Tue	12/30 16:00 Tue	12/30 19:00 Tue	12/30 22:00 Tue	12/31 01:00 Wed	12/31 04:00 Wed	12/31 07:00 Wed	12/31 10:00 Wed	12/31 13:00 Wed	12/31 16:00 Wed	12/31 19:00 Wed	12/31 22:00 Wed	1/1 01:00 Thu	1/1 04:00 Thu	1/1 07:00 Thu	1/1 10:00 Thu	1/1 13:00 Thu	1/1 16:00 Thu	1/1 19:00 Thu	1/1 22:00 Thu	1/2 01:00 Fri	1/2 07:00 Fri	1/2 13:00 Fri
GFS-N/X	--	--					21				34				25				32			23
NAM-N/X							20				36				20				32	--		21	--
GFS-TMP	--	--	24	23	24	24	24	28	31	33	32	32	31	29	27	26	29	31	29	28	26	25	36
NAM-TMP	25	26	24	24	23	23	24	29	33	34	33	31	28	24	20	24	29	30	26	--	25	24	--
GFS-DPT	--	--	9	11	13	14	16	18	21	22	25	26	25	23	21	19	19	19	20	21	20	19	23
NAM-DPT	7	7	9	10	11	13	15	19	21	23	24	26	22	17	14	14	14	14	13	--	13	17	--
GFS-CLD	--	--	OV	OV	OV	OV	BK	OV	OV	OV	OV	OV	OV	OV	OV	BK	BK	BK	BK	BK	BK	BK	BK
NAM-CLD	FW	SC	OV	OV	OV	OV	BK	OV	OV	OV	OV	OV	OV	OV	FW	FW	BK	BK	BK	--	FW	BK	--
GFS-WDR	--	--	26	25	24	23	24	25	26	25	25	26	28	32	34	35	26	26	31	22	23	34	34
NAM-WDR	27	27	26	25	24	24	25	25	26	25	27	27	30	34	36	32	27	27	35	--	18	20	--
GFS-WSP	--	--	09	09	10	10	10	11	13	12	12	13	12	10	05	04	05	05	03	02	04	06	07
NAM-WSP	11	10	09	09	10	11	09	10	12	12	13	11	12	10	05	05	05	05	04	--	04	04	--
GFS-P06	--	--			13		2		0		3		25		16		0		0		0	1	3
NAM-P06			11		22		11		0		30		51		0		0		0	--	0	3	--
GFS-P12	--	--					13				6				28				0			5
NAM-P12							22				30				51				0	--		3	--
GFS-Q06	--	--			0		0		0		0		0		0		0		0		0	0	0
NAM-Q06			0		0		0		0		0		1		0		0		0	--	0	0	--
GFS-Q12	--	--					0				0				0				0			0
NAM-Q12							0				0				1				0	--		0	--
GFS-T06	--	--			0/ 5		0/ 1		0/ 1		0/ 0		0/ 8		1/ 3		0/ 3		0/ 0		1/ 7		0/ 0
NAM-T06			0/ 3		0/ 9		0/ 2		0/ 3		0/ 6		0/12		0/ 5		0/ 3		0/ 5	--		0/ 0	--
GFS-T12	--	--							0/ 5				2/13				1/ 9				1/12		1/ 3
NAM-T12					0/ 9				0/ 3				0/16				0/ 5			--	1/ 7		--
GFS-POZ	--	--	4	3	4	1	4	1	0	3	4	2	2	1	1	2	0	1	5	8	9	10	12
NAM-POZ	0	1	1	2	0	0	1	1	1	4	4	3	1	1	1	1	1	2	3	--	9	20	--
GFS-POS	--	--	92	96	97	99	96	99	00	97	96	98	99	99	99	98	95	86	91	79	70	74	56
NAM-POS	00	99	99	98	99	99	98	99	00	96	95	97	98	98	99	98	98	96	97	--	88	67	--
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	--	--													0							0
NAM-SNW							0								1					--		0	--
GFS-CIG	--	--	6	6	6	7	8	6	6	7	6	4	4	5	6	8	8	8	8	8	8	8	8
NAM-CIG	8	8	7	6	7	6	6	6	6	6	5	4	4	5	8	8	8	8	8	--	8	8	--
GFS-VIS	--	--	7	7	7	7	7	7	7	7	7	6	6	7	7	7	7	7	7	7	7	7	7
NAM-VIS	7	7	7	7	7	7	7	7	7	7	6	5	5	7	7	7	7	7	7	--	7	7	--
GFS-OBV	--	--	N	N	N	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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