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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   2/14/2018  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  43 45 47 49 51 51 50 48 47 47 46 47 47 47 47 48 48 48 48 48 49 51 53 56 59
DPT  33 34 36 38 41 42 42 42 42 42 42 43 43 43 44 44 45 45 45 45 45 46 47 48 49
WDR  23 23 23 23 23 22 21 18 18 19 23 23 22 23 24 23 22 22 22 23 23 24 23 23 23
WSP  09 08 08 09 08 07 06 05 03 03 03 03 04 05 06 04 03 03 03 03 03 03 04 06 07
WGS  NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG NG
PPO   0  1  1  1  1  9  7  1  6  1  3  6 19 30 46 46 43 40 31 23 13  8  6  3  1
PCO   N  N  N  N  N  N  N  N  N  N  N  N  N  N  Y  Y  Y  Y  N  N  N  N  N  N  N
P06                           9                50                57            
LP1   0  0  0  0  0  0  0  0  0  0  0  0  1  1  1  0  1  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   1  1  1  0  0  0  1  1  1  1  1  3 13 19 24 17 18 15  8  4  0  0  0  0  1
CC1   N  N  N  N  N  N  N  N  N  N  N  N  L  L  M  L  M  L  N  N  N  N  N  N  N
POZ   3  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
POS   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
TYP   R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R  R
CLD  BK BK BK BK BK OV BK BK OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV
CIG   8  8  7  7  8  8  8  7  7  7  6  6  6  4  3  3  3  3  2  2  2  2  6  6  7
CCG   6  6  6  6  6  6  6  6  6  6  6  6  6  5  2  2  2  2  2  2  2  2  6  6  6
VIS   7  7  7  7  7  7  7  7  7  7  7  7  7  5  5  5  5  5  5  3  4  5  7  7  7
CVS   6  7  7  7  7  7  7  7  7  7  7  7  7  5  5  5  5  5  5  5  5  5  5  5  6
OBV   N  N  N  N  N  N  N  N  N  N  N  N  N BR FG FG FG BR FG FG FG FG HZ  N  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.
  • LP1 = probability of lightning (at least one total lightning flash) occurring during the 1-hr period ending at the indicated time.
  • LC1 = categorical forecast of no (N), low (L), medium (M), or high (H) potential for lightning (at least one total lightning flash) occurring during the 1-hr period ending at the indicated time.
  • CP1 probability of convection (at least one total lightning flash and/or radar reflectivity of 40dBZ or higher) occurring during the 1-hr period ending at the indicated time.
  • CC1 = categorical forecast of no (N), low (L), medium (M), or high (H) potential for convection (at least one total lightning flash and/or radar reflectivity of 40dBZ or higher) occurring during the 1-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: June 21, 2018. 18:21  UTC