KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 1/01/2026 0600 UTC
KCVG NAM MOS GUIDANCE 1/01/2026 0000 UTC

Date/Time UTC	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 09:00 Fri	1/2 12:00 Fri	1/2 15:00 Fri	1/2 18:00 Fri	1/2 21:00 Fri	1/3 00:00 Sat	1/3 03:00 Sat	1/3 06:00 Sat	1/3 09:00 Sat	1/3 12:00 Sat	1/3 15:00 Sat	1/3 18:00 Sat	1/4 00:00 Sun	1/4 06:00 Sun
Date/Time Local	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 04:00 Fri	1/2 07:00 Fri	1/2 10:00 Fri	1/2 13:00 Fri	1/2 16:00 Fri	1/2 19:00 Fri	1/2 22:00 Fri	1/3 01:00 Sat	1/3 04:00 Sat	1/3 07:00 Sat	1/3 10:00 Sat	1/3 13:00 Sat	1/3 19:00 Sat	1/4 01:00 Sun
GFS-X/N	--	--					33				23				38				24			37
NAM-X/N							36				21				41				21	--		43	--
GFS-TMP	--	--	25	24	30	32	30	28	27	26	25	28	35	37	33	32	30	27	25	27	33	32	26
NAM-TMP	32	29	25	28	33	35	32	30	27	25	23	31	37	39	34	26	24	24	24	--	41	35	--
GFS-DPT	--	--	22	17	17	18	20	22	23	22	19	17	19	20	20	21	20	18	17	17	17	16	15
NAM-DPT	30	26	22	19	18	18	19	20	19	18	17	17	17	17	17	15	16	17	18	--	24	23	--
GFS-CLD	--	--	OV	OV	OV	OV	OV	BK	CL	FW	FW	FW	SC	BK	OV	OV	OV	OV	OV	OV	OV	BK	CL
NAM-CLD	OV	OV	OV	OV	BK	BK	OV	OV	SC	CL	SC	CL	FW	SC	BK	BK	BK	BK	BK	--	OV	BK	--
GFS-WDR	--	--	01	04	23	23	15	23	28	31	33	31	30	33	36	01	02	03	03	03	03	01	34
NAM-WDR	27	31	34	35	24	23	34	31	31	33	26	31	30	31	04	06	05	06	05	--	04	35	--
GFS-WSP	--	--	09	05	03	03	02	03	05	05	05	04	05	05	06	06	08	09	09	10	08	06	06
NAM-WSP	13	11	06	06	03	04	03	02	04	05	02	04	04	03	04	03	04	05	07	--	06	06	--
GFS-P06	--	--			0		1		2		1		0		0		1		3		3	2	6
NAM-P06			24		0		0		0		0		1		1		2		4	--	8	2	--
GFS-P12	--	--					1				2				0				3			3
NAM-P12							7				4				1				4	--		8	--
GFS-Q06	--	--			0		0		0		0		0		0		0		0		0	0	0
NAM-Q06			0		0		0		0		0		0		0		0		0	--	0	0	--
GFS-Q12	--	--					0				0				0				0			0
NAM-Q12							0				0				0				0	--		0	--
GFS-T06	--	--			0/ 7		0/ 1		0/ 9		0/ 6		0/ 2		0/ 0		0/ 4		0/ 0		0/ 0		0/ 1
NAM-T06			0/ 2		0/ 3		1/ 2		1/ 4		0/ 3		0/ 0		0/ 1		0/ 2		0/ 0	--		0/ 6	--
GFS-T12	--	--							1/24				0/ 9				1/ 9				0/ 1		0/ 8
NAM-T12					0/ 3				1/ 4				0/ 3				0/ 2			--	1/ 0		--
GFS-POZ	--	--	45	25	13	18	11	5	10	10	16	14	13	13	13	12	8	7	8	2	1	2	2
NAM-POZ	0	0	0	0	1	1	5	8	13	13	18	13	11	9	11	14	15	16	17	--	15	16	--
GFS-POS	--	--	56	75	87	82	89	94	82	79	76	72	59	57	61	67	69	73	76	90	85	83	98
NAM-POS	72	72	97	00	99	99	95	91	85	82	79	84	76	77	74	64	60	53	45	--	36	44	--
GFS-TYP	--	--	Z	Z	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								0	--			--
GFS-CIG	--	--	4	5	6	7	6	8	8	8	8	8	8	8	8	8	8	8	7	7	8	8	8
NAM-CIG	4	5	5	8	8	8	7	6	8	8	8	8	8	8	8	8	8	8	8	--	8	8	--
GFS-VIS	--	--	4	5	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	5	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	--	7	7	--
GFS-OBV	--	--	BR	BR	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.

8,595 Views