KD4PYR MOS Compare

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GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 4/19/2026 0600 UTC
KCVG NAM MOS GUIDANCE 4/19/2026 0000 UTC

Date/Time UTC	4/19 06:00 Sun	4/19 09:00 Sun	4/19 12:00 Sun	4/19 15:00 Sun	4/19 18:00 Sun	4/19 21:00 Sun	4/20 00:00 Mon	4/20 03:00 Mon	4/20 06:00 Mon	4/20 09:00 Mon	4/20 12:00 Mon	4/20 15:00 Mon	4/20 18:00 Mon	4/20 21:00 Mon	4/21 00:00 Tue	4/21 03:00 Tue	4/21 06:00 Tue	4/21 09:00 Tue	4/21 12:00 Tue	4/21 15:00 Tue	4/21 18:00 Tue	4/22 00:00 Wed	4/22 06:00 Wed
Date/Time Local	4/19 02:00 Sun	4/19 05:00 Sun	4/19 08:00 Sun	4/19 11:00 Sun	4/19 14:00 Sun	4/19 17:00 Sun	4/19 20:00 Sun	4/19 23:00 Sun	4/20 02:00 Mon	4/20 05:00 Mon	4/20 08:00 Mon	4/20 11:00 Mon	4/20 14:00 Mon	4/20 17:00 Mon	4/20 20:00 Mon	4/20 23:00 Mon	4/21 02:00 Tue	4/21 05:00 Tue	4/21 08:00 Tue	4/21 11:00 Tue	4/21 14:00 Tue	4/21 20:00 Tue	4/22 02:00 Wed
GFS-X/N	--	--					62				35				60				39			73
NAM-X/N							57				34				57				34	--		69	--
GFS-TMP	--	--	40	52	58	60	54	46	43	39	39	49	56	59	54	47	43	41	44	60	69	67	57
NAM-TMP	42	39	39	48	55	55	50	46	42	38	37	48	53	56	53	42	39	37	39	--	64	65	--
GFS-DPT	--	--	28	26	23	22	22	26	28	28	27	25	23	22	24	27	28	30	34	41	43	42	46
NAM-DPT	34	32	31	27	25	24	26	28	28	27	27	25	23	21	23	23	25	27	30	--	38	39	--
GFS-CLD	--	--	FW	FW	BK	BK	OV	OV	BK	CL	FW	CL	FW	FW	SC	CL	CL	FW	CL	CL	FW	SC	OV
NAM-CLD	OV	BK	FW	FW	BK	BK	OV	OV	BK	CL	CL	CL	CL	CL	FW	CL	CL	SC	SC	--	FW	SC	--
GFS-WDR	--	--	27	27	27	27	30	33	34	35	01	33	31	29	31	15	15	16	16	21	23	22	22
NAM-WDR	31	30	26	28	28	27	28	32	35	34	35	35	33	32	34	07	16	14	17	--	22	23	--
GFS-WSP	--	--	06	11	17	18	14	12	08	04	03	05	07	07	04	03	05	05	07	12	16	12	10
NAM-WSP	11	06	04	11	15	15	13	10	09	04	03	07	07	06	05	03	04	04	07	--	12	09	--
GFS-P06	--	--			0		0		3		6		0		0		0		0		0	3	14
NAM-P06			6		2		1		4		3		0		0		0		7	--	8	4	--
GFS-P12	--	--					1				8				0				0			3
NAM-P12							6				4				0				7	--		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		3/25		3/ 4		1/ 0		0/ 6		0/ 1		0/ 0		1/ 0		2/ 3		9/ 4
NAM-T06			0/ 6		0/ 2		2/22		1/16		1/ 4		0/ 8		0/ 5		1/ 3		2/ 2	--		1/10	--
GFS-T12	--	--							3/26				1/ 8				0/ 1				2/ 5		12/14
NAM-T12					0/ 6				2/22				1/ 8				1/ 5			--	2/ 3		--
GFS-POZ	--	--	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
NAM-POZ	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	--	0	0	--
GFS-POS	--	--	23	28	30	4	8	17	23	29	57	31	26	22	12	3	1	1	0	0	0	0	0
NAM-POS	15	25	27	17	22	14	6	16	44	31	45	32	27	24	24	16	8	2	7	--	0	0	--
GFS-TYP	--	--	R	R	R	R	R	R	R	R	S	R	R	R	R	R	R	R	R	R	R	R	R
NAM-TYP	R	R	R	R	R	R	R	R	R	R	S	R	R	R	R	R	R	R	R	--	R	R	--
GFS-SNW	--	--									0								0
NAM-SNW											0								0	--			--
GFS-CIG	--	--	8	8	8	7	7	7	7	8	8	8	8	8	8	8	8	8	8	8	8	8	7
NAM-CIG	7	8	8	8	8	7	7	6	7	8	8	8	8	8	8	8	8	8	8	--	8	8	--
GFS-VIS	--	--	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	7	7	7	7	7	7	7	7	7	7	7	7	7	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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