KD4PYR MOS Compare

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GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 1/21/2026 1200 UTC
KCVG NAM MOS GUIDANCE 1/21/2026 1200 UTC

Date/Time UTC	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 15:00 Fri	1/23 18:00 Fri	1/23 21:00 Fri	1/24 00:00 Sat	1/24 06:00 Sat	1/24 12:00 Sat
Date/Time Local	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 10:00 Fri	1/23 13:00 Fri	1/23 16:00 Fri	1/23 19:00 Fri	1/24 01:00 Sat	1/24 07:00 Sat
GFS-N/X							25				34				15				16		5
NAM-N/X							26				38				14				21		-3
GFS-TMP	36	37	36	36	34	31	26	27	30	32	28	28	26	21	16	15	14	13	12	9	7
NAM-TMP	35	38	36	39	35	31	26	28	34	36	29	22	20	18	16	19	19	17	11	3	0
GFS-DPT	31	31	31	31	28	24	18	15	11	8	8	12	11	8	3	-1	-4	-5	-4	-6	-5
NAM-DPT	25	28	28	31	27	22	18	14	11	9	8	6	7	7	7	9	5	1	-3	10	11
GFS-CLD	OV	OV	OV	OV	SC	SC	FW	CL	FW	SC	SC	BK	OV	BK	BK	OV	OV	BK	BK	OV	OV
NAM-CLD	OV	OV	OV	OV	OV	OV	SC	CL	FW	SC	FW	FW	BK	BK	BK	BK	BK	SC	FW	SC	OV
GFS-WDR	21	21	22	24	23	26	29	29	27	26	25	24	26	31	32	32	33	33	35	02	04
NAM-WDR	22	21	23	23	24	26	28	27	27	26	26	23	26	30	33	32	33	33	35	02	04
GFS-WSP	17	17	14	13	13	14	11	09	09	09	06	06	07	10	15	15	15	14	13	12	12
NAM-WSP	14	14	11	11	13	14	10	09	08	08	05	05	05	05	12	14	14	14	16	12	10
GFS-P06			28		18		4		0		1		0		4		4		3	2	2
NAM-P06			15		5		5		6		6		6		10		10		8	8	10
GFS-P12							18				2				4				5		9
NAM-P12							12				6				10				11		10
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			0/20		0/19		0/13		0/ 9		0/ 0		0/10		0/10		0/10		0/ 6		0/ 5
NAM-T06			0/23		0/18		0/ 5		0/ 8		0/ 8		0/10		1/ 7		0/ 7		0/11		0/ 6
GFS-T12					0/29				0/13				1/19				0/10			0/14
NAM-T12					0/25				0/10				0/14				1/ 7			0/19
GFS-POZ	4	0	0	0	0	0	1	1	1	2	1	1	2	0	1	1	1	1	1	0	1
NAM-POZ	9	6	0	0	0	0	1	1	1	2	2	1	1	1	1	2	2	2	3	3	3
GFS-POS	75	47	35	51	71	93	99	99	99	99	99	99	99	99	99	98	98	99	99	98	96
NAM-POS	91	65	60	80	85	96	99	99	99	98	97	98	98	98	99	98	98	96	97	94	95
GFS-TYP	S	R	R	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						0
NAM-SNW							0								0						0
GFS-CIG	4	4	4	6	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	7
NAM-CIG	4	4	5	5	6	6	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8
GFS-VIS	7	5	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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