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Description of the GFS LAMP Alphanumeric Message


The GFS MOS-Based LAMP guidance is generated using the current station observations for the cycle time, analyses of the observations, simple model output, and the MOS data derived from NCEP's Global Spectral Model. To stay updated about the availablity of GFS-LAMP guidance for the different cycle times, please refer to our Recent Changes Document . This guidance is valid for stations in the United States, Puerto Rico, and the U.S. Virgin Islands. For the most recent station list click here . Forecast elements are valid from 1 to 25 hours in advance.


LAMP Sample Message
 KBWI   GFS LAMP GUIDANCE  12/15/2005  0900 UTC
 UTC  10 11 12 13 14 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10
 TMP  24 25 25 24 25 26 26 27 28 28 29 30 31 32 34 34 35 35 36 36 38 38 38 38 38
 DPT  13 14 15 17 18 20 22 24 26 28 29 30 31 32 34 34 35 35 36 36 38 38 38 38 37
 WDR  05 07 06 06 06 07 08 09 08 09 08 09 08 08 08 08 08 08 08 08 08 06 28 26 26
 WSP  06 05 06 07 07 08 08 08 08 07 08 07 08 10 12 13 13 12 11 11 10 09 07 10 10
 WGS  NG NG NG NG NG NG NG NG NG NG NG NG NG NG 20 20 21 21 NG NG NG NG NG NG NG
 PPO   0  1  2  9 17 24 33 43 52 63 69 73 77 83 82 86 87 91 94 93 92 82 70 58 45
 PCO   N  N  N  N  N  N  N  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y  Y
 P06                          41               100               100            
 TP2        67 45 27 16  6     0     0     1     2     3     7     8     8     7
 TC2         Y  Y  Y  Y  N     N     N     N     N     N     N     N     N     N
 POZ   6  8  8 12 15 17 18 20 19 17 20 21 21 22 17 18 14 12  9  7  5  4  5  4  3
 POS  92 90 90 85 80 75 73 72 72 49 44 40 33 31 18 16  1  0  0  1  0  0  7 10 18
 TYP   S  S  S  S  S  S  S  S  S  S  S  S  S  S  R  R  R  R  R  R  R  R  R  R  R
 CLD  OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV
 CIG   5  5  5  5  5  5  5  4  4  3  3  3  2  2  2  2  2  2  2  2  2  2  2  2  3
 CCG   5  5  5  5  5  4  4  4  3  3  2  2  2  2  2  2  2  2  2  2  2  2  2  2  3
 VIS   7  7  7  7  7  7  6  5  4  3  3  2  2  3  3  3  3  3  3  3  3  4  5  5  7
 CVS   7  7  7  7  5  5  5  4  4  3  3  3  4  4  4  4  4  4  4  4  4  4  5  5  5
 OBV   N  N  N  N  N  N  N BR BR BR BR BR BR BR BR BR BR BR BR BR BR BR BR BR  N
                
  • UTC = 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.
  • TMP = surface temperature valid at that hour.
  • DPT = surface dewpoint 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.
  • WGS = forecasts of the 10-meter wind gust at the hour, given in knots.  "NG" means that no gust is forecast.
  • PPO = probability of precipitation occurring on the hour.  The precipitation need not be measurable.
  • P06 = probability of measurable precipitation (PoP) during a 6-h period ending at that time.
  • PCO = categorical forecast of yes (Y) or no (N) indicating if precipitation, not necessarily measurable, will occur on the hour.
  • TP2 = probability of thunderstorms during the 2-hr period ending at the indicated time.
  • TC2 = categorical forecast of yes (Y) or no (N) indicating if thunderstorms will occur during the 2-hr period ending at the indicated time.
  • POZ* = conditional probability of freezing pcp occurring at the hour.  This probability is conditional on precipitation occurring.
  • POS* = conditional probability of snow occurring at the hour.  This probability is conditional on precipitation occurring.
  • TYP* = conditional precipitation type at the hour.  This category forecast is conditional on precipitation occurring.
  • CLD = forecast categories of total sky cover valid at that hour.
  • CIG = ceiling height categorical forecasts at the hour.
  • CCG = conditional ceiling height categorical forecasts at the hour.   This category forecast is conditional on precipitation occurring.
  • VIS = visibility categorical forecasts at the hour.
  • CVS = conditional visibility categorical forecasts at the hour.   This category forecast is conditional on precipitation occurring.
  • OBV = obstruction to vision categorical forecasts at the hour.

*In the contiguous United States, these products are available September 1 - May 31.


Definitions of Categorical Elements

LAV Ceiling Height (CIG) and
Conditional Ceiling Height (CCG) 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

LAV Visibility (VIS) and
Conditional Visibility (CVIS) 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

For numerical forecast
elements, missing values are
indicated by a 99 or 999



LAV 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

LAV 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

LAV 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
X forecast is missing for this hour

 

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Page Last Modified: April 14, 2014. 19:59  UTC