MOS Text Guidance

KDCA   GFS LAMP GUIDANCE  12/06/2018  1500 UTC                                 
UTC  16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 
TMP  41 43 44 45 45 44 43 41 41 40 40 40 39 38 38 37 37 36 36 35 35 36 38 40 41 
DPT  22 22 21 21 21 21 21 22 22 23 23 23 22 23 22 22 22 21 21 21 21 21 21 21 19 
WDR  24 23 23 23 22 22 21 21 21 21 22 22 23 24 25 27 29 31 31 31 32 33 33 32 32 
WSP  09 09 09 09 09 08 08 07 07 07 08 07 07 07 06 06 06 06 06 06 08 08 09 10 09 
WGS  16 16 16 16 NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG 16 
PPO   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  1  0  1  0  0  0  0  0  0  0 
PCO   N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N 
P06                           0                 0                 1             
LP1   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
LC1   N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N 
CP1   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
CC1   N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N 
POZ   0  0  0  0  0  0  0  0  1  0  0  1  0  0  0  0  0  1  0  0  0  0  0  0  0 
POS  71 66 69 71 68 63 55 46 38 41 43 49 51 54 60 66 72 79 80 80 80 76 71 71 71 
TYP   S  S  S  S  S  S  S  S  R  R  R  R  S  S  S  S  S  S  S  S  S  S  S  S  S 
CLD  BK BK BK BK OV OV OV OV OV OV OV OV OV OV BK BK BK SC SC FW FW FW SC SC SC 
CIG   8  8  8  8  8  8  8  7  7  7  7  7  7  7  7  8  8  8  8  8  8  8  8  8  8 
CCG   7  6  6  6  6  6  7  7  7  7  6  7  6  7  7  7  7  7  7  7  7  7  7  7  7 
VIS   7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7 
CVS   7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7 
OBV   N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N 
                                                                                


How To Read MOS Table:

Courtesy of the National Weather Service

  • 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.
  • SNW = snowfall categorical forecasts during a 24-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.
  • 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

MAV Ceiling Height 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 or unlimited ceiling


MAV 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


MAV 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
MAV Cloud (CLD) Categories
CL clear
FW few > 0 to 2 octas
SC scattered > 2 to 4 octas
BK broken > 4 to < 8 octas
OV overcast


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


MAV 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


MAV 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