KD4PYR MOS Compare

GFS and NAM MOS Compare

KCVG GFS MOS GUIDANCE 8/27/2025 1200 UTC
KCVG NAM MOS GUIDANCE 8/27/2025 1200 UTC

Date/Time UTC	8/27 18:00 Wed	8/27 21:00 Wed	8/28 00:00 Thu	8/28 03:00 Thu	8/28 06:00 Thu	8/28 09:00 Thu	8/28 12:00 Thu	8/28 15:00 Thu	8/28 18:00 Thu	8/28 21:00 Thu	8/29 00:00 Fri	8/29 03:00 Fri	8/29 06:00 Fri	8/29 09:00 Fri	8/29 12:00 Fri	8/29 15:00 Fri	8/29 18:00 Fri	8/29 21:00 Fri	8/30 00:00 Sat	8/30 06:00 Sat	8/30 12:00 Sat
Date/Time Local	8/27 14:00 Wed	8/27 17:00 Wed	8/27 20:00 Wed	8/27 23:00 Wed	8/28 02:00 Thu	8/28 05:00 Thu	8/28 08:00 Thu	8/28 11:00 Thu	8/28 14:00 Thu	8/28 17:00 Thu	8/28 20:00 Thu	8/28 23:00 Thu	8/29 02:00 Fri	8/29 05:00 Fri	8/29 08:00 Fri	8/29 11:00 Fri	8/29 14:00 Fri	8/29 17:00 Fri	8/29 20:00 Fri	8/30 02:00 Sat	8/30 08:00 Sat
GFS-N/X							53				75				58				79		54
NAM-N/X							51				76				56				73		53
GFS-TMP	75	76	69	62	58	56	56	68	73	72	68	64	62	60	60	70	76	77	71	62	56
NAM-TMP	71	73	68	60	57	54	55	68	74	74	70	64	62	59	59	66	70	71	65	57	55
GFS-DPT	42	41	43	45	47	47	49	49	48	51	53	55	56	55	55	57	55	53	53	51	49
NAM-DPT	43	42	44	47	47	47	49	50	50	50	52	55	54	54	56	57	56	54	52	49	49
GFS-CLD	CL	FW	BK	BK	SC	CL	FW	BK	OV	OV	BK	FW	BK	BK	BK	BK	BK	SC	FW	CL	FW
NAM-CLD	FW	SC	BK	SC	CL	CL	FW	FW	BK	BK	SC	FW	SC	SC	OV	OV	BK	BK	SC	CL	FW
GFS-WDR	31	32	32	15	18	18	19	23	29	31	29	20	23	25	28	32	32	34	35	05	06
NAM-WDR	31	30	29	21	20	21	19	22	25	27	25	24	29	32	36	02	02	01	04	06	04
GFS-WSP	07	07	05	03	03	03	03	06	09	07	05	04	03	02	02	05	08	08	07	05	05
NAM-WSP	06	06	03	01	01	01	02	07	08	07	04	03	02	02	04	07	08	08	08	06	06
GFS-P06			0		0		0		6		19		0		0		2		1	4	9
NAM-P06			1		1		2		2		3		0		5		2		3	1	2
GFS-P12							4				19				1				7		9
NAM-P12							2				3				5				5		5
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/ 0		0/ 0		0/ 0		3/ 0		6/ 0		3/ 0		1/ 0		1/ 1		3/ 0		0/ 0
NAM-T06			0/ 0		0/ 0		0/ 0		3/ 1		4/ 2		2/ 0		1/ 0		0/ 1		0/ 4		0/ 0
GFS-T12					3/ 0				3/ 1				6/ 1				1/ 1			3/ 4
NAM-T12					0/ 0				3/ 1				4/ 3				1/ 1			0/ 4
GFS-CIG	8	8	8	8	8	8	8	8	7	7	7	8	7	7	7	8	7	8	8	8	8
NAM-CIG	8	8	8	8	8	8	8	8	8	7	8	8	8	6	6	5	6	8	8	8	8
GFS-VIS	7	7	7	7	7	7	7	7	7	7	7	7	7	7	5	7	7	7	7	7	7
NAM-VIS	7	7	7	7	7	7	7	7	7	7	7	7	7	5	4	7	7	7	7	7	7
GFS-OBV	N	N	N	N	N	N	N	N	N	N	N	N	N	N	BR	N	N	N	N	N	N
NAM-OBV	N	N	N	N	N	N	N	N	N	N	N	N	N	BR	BR	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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