KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 1/21/2026 0000 UTC
KCVG NAM MOS GUIDANCE 1/21/2026 0000 UTC

Date/Time UTC	1/21 06:00 Wed	1/21 09:00 Wed	1/21 12:00 Wed	1/21 15:00 Wed	1/21 18:00 Wed	1/21 21:00 Wed	1/22 00:00 Thu	1/22 03:00 Thu	1/22 06:00 Thu	1/22 09:00 Thu	1/22 12:00 Thu	1/22 15:00 Thu	1/22 18:00 Thu	1/22 21:00 Thu	1/23 00:00 Fri	1/23 03:00 Fri	1/23 06:00 Fri	1/23 09:00 Fri	1/23 12:00 Fri	1/23 18:00 Fri	1/24 00:00 Sat
Date/Time Local	1/21 01:00 Wed	1/21 04:00 Wed	1/21 07:00 Wed	1/21 10:00 Wed	1/21 13:00 Wed	1/21 16:00 Wed	1/21 19:00 Wed	1/21 22:00 Wed	1/22 01:00 Thu	1/22 04:00 Thu	1/22 07:00 Thu	1/22 10:00 Thu	1/22 13:00 Thu	1/22 16:00 Thu	1/22 19:00 Thu	1/22 22:00 Thu	1/23 01:00 Fri	1/23 04:00 Fri	1/23 07:00 Fri	1/23 13:00 Fri	1/23 19:00 Fri
GFS-X/N							38				26				36				16		20
NAM-X/N							38				23				36				10		25
GFS-TMP	22	23	25	32	35	36	36	36	35	31	27	27	33	35	30	28	25	20	17	17	13
NAM-TMP	20	23	26	27	33	36	37	38	34	28	23	25	32	34	28	20	17	15	13	22	14
GFS-DPT	6	9	14	23	28	31	31	31	27	23	19	15	12	11	11	13	12	10	6	-2	-4
NAM-DPT	5	9	13	16	23	27	29	30	26	20	14	9	7	6	5	4	5	4	2	2	-5
GFS-CLD	BK	BK	OV	OV	OV	OV	OV	OV	SC	SC	CL	CL	FW	FW	SC	BK	BK	OV	OV	OV	BK
NAM-CLD	SC	SC	OV	OV	OV	OV	OV	OV	OV	OV	SC	FW	FW	SC	BK	OV	BK	SC	OV	BK	BK
GFS-WDR	17	17	18	20	21	22	23	24	23	26	29	28	26	26	28	26	28	31	33	32	35
NAM-WDR	17	17	18	20	22	22	22	23	25	27	28	28	27	27	30	23	25	30	33	33	34
GFS-WSP	07	08	12	15	17	17	14	13	13	14	10	07	09	09	07	04	06	07	15	14	16
NAM-WSP	08	08	10	14	15	14	10	12	13	14	11	10	09	07	05	04	05	08	13	14	13
GFS-P06			5		44		35		7		5		2		2		2		4	3	6
NAM-P06			1		19		34		7		7		7		6		7		10	13	9
GFS-P12							61				8				3				9		7
NAM-P12							34				9				9				10		14
GFS-Q06			0		1		0		0		0		0		0		0		0	0	0
NAM-Q06			0		0		0		0		0		0		0		0		0	0	0
GFS-Q12							1				0				0				0		0
NAM-Q12							0				0				0				0		0
GFS-T06			0/ 4		0/11		0/21		0/14		0/14		0/ 7		0/ 7		0/14		0/ 7		0/ 0
NAM-T06			0/ 5		0/ 7		0/20		0/16		0/10		0/ 3		0/11		1/16		1/ 8		0/10
GFS-T12					0/11				1/27				0/14				1/20			0/ 9
NAM-T12					0/ 7				0/27				0/10				1/16			1/ 8
GFS-POZ	3	1	13	11	7	0	0	0	0	0	1	1	2	0	1	1	1	1	2	1	2
NAM-POZ	3	4	9	17	17	11	0	0	0	0	2	1	2	2	2	2	2	2	2	2	4
GFS-POS	92	98	82	87	77	69	52	51	61	94	99	99	98	96	99	98	99	97	97	00	98
NAM-POS	94	93	75	78	69	60	69	66	88	96	99	99	99	98	98	96	96	97	96	98	94
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								0
GFS-CIG	8	8	6	6	3	3	5	7	8	8	8	8	8	8	8	8	8	8	8	7	8
NAM-CIG	8	8	7	6	4	4	5	5	5	6	8	8	8	8	8	8	8	8	8	8	8
GFS-VIS	7	7	7	5	4	5	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
NAM-VIS	7	7	7	7	7	5	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
GFS-OBV	N	N	N	N	BR	BR	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N
NAM-OBV	N	N	N	N	N	HZ	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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