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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
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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
|
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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
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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
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