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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   4/14/2014  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  74 75 78 77 76 75 74 71 69 67 67 65 64 64 64 64 63 63 62 62 63 63 63 64 63
 DPT  56 56 56 56 56 55 56 56 57 56 56 56 56 57 57 58 58 58 58 58 60 59 59 59 56
 WDR  20 20 20 20 21 20 19 18 17 17 17 17 18 17 15 15 16 17 14 14 15 18 19 19 18
 WSP  20 21 21 18 18 16 14 13 12 12 14 12 12 11 11 13 15 16 16 15 14 15 14 16 15
 WGS  28 29 29 26 26 24 22 NG NG NG NG NG NG NG NG 20 23 23 23 23 22 23 23 25 23
 PPO   0  0  0  0  0  1  1  2  2  3  4  5  7 11 13 22 27 33 38 43 52 54 52 51 49
 PCO   N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  Y  Y  Y  Y  Y  Y  Y  Y
 P06                          22                37                87
 LP2         0  0  0  0  0     1     3     5     6     4     4     5     7    10
 LC2         N  N  N  N  N     N     N     N     N     N     N     N     N     L
 CP2         1  0  0  0  0     0     5    10    16    16    25    35    37    37
 CC2         N  N  N  N  N     N     N     N     L     L     M     H     H     H
 POZ   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
 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  OV OV BK OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV
 CIG   6  6  6  6  7  7  7  7  7  6  6  5  4  3  3  3  3  3  3  3  3  3  2  2  2
 CCG   6  6  6  6  6  6  6  6  6  6  5  5  4  3  3  3  3  3  3  3  3  3  3  2  2
 VIS   7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  6  6  5  5  5  4  4  4  4
 CVS   7  7  7  7  7  7  7  7  7  7  7  7  6  7  7  5  5  4  5  4  4  4  4  3  4
 OBV   N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N  N BR BR BR BR BR BR BR BR
                
  • 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.
  • LP2 = probability of lightning (at least one cloud-to-ground lightning strike) occurring during the 2-hr period ending at the indicated time.
  • LC2 = categorical forecast of no (N), low (L), medium (M), or high (H) potential for lightning (at least one cloud-to-ground lightning strike) occurring during the 2-hr period ending at the indicated time.
  • CP2 probability of convection (at least one cloud-to-ground lightning strike and/or radar reflectivity of 40dBZ or higher) occurring during the 2-hr period ending at the indicated time.
  • CC2 = categorical forecast of no (N), low (L), medium (M), or high (H) potential for convection (at least one cloud-to-ground lightning strike and/or radar reflectivity of 40dBZ or higher) occurring 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. 20:24  UTC