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Sample Message
LAMP Bulletin for IAD at 0200 UTC on 02/18/2003
PROJ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
UTC 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22
TEMP 24 24 24 24 24 24 24 24 23 25 26 29 31 34 37 39 40 40 39 38
DEWPT 22 23 23 24 24 24 24 24 23 23 24 24 26 27 27 28 28 28 28 27
POPO 57 53 53 37 36 36 26 24 11 10 11 10 8 6 4 2 2 1 1 0
PRECIP Y Y Y N N N N N N N N N N N N N N N N N
POP 6 HR 40 5
P TYPE S S S S S S S S S S S S S S S S RS RS R ZS
PROB ZR 4 6 8 8 9 9 9 11 10 10 9 11 12 9 8 4 5 6 7 12
PROB SNW 93 91 89 90 90 91 91 91 91 93 94 94 82 77 66 57 53 48 46 53
OB VIS F F F F F F F F F F F F - - - - - - - -
VIS CAT 2 2 1 1 1 1 1 1 1 2 2 2 3 5 5 5 5 5 5 5
CLD HGT 3 25 25 25 25 - - - - - - - - - - - - - - - -
SKY CVR 3 OVC OVC OVC OVC - - - - - - - - - - - - - CLR CLR CLR
CLD HGT 2 12 12 12 12 - - - - - - - - - - - - - - - -
SKY CVR 2 BKN BKN BKN BKN - - - - - - - - - - - - - CLR CLR CLR
CLD HGT 1 5 5 5 5 4 4 5 7 7 8 7 9 13 11 14 15 19 23 23 23
SKY CVR 1 BKN BKN BKN BKN OVC OVC OVC OVC OVC OVC OVC OVC OVC OVC OVC OVC OVC BKN BKN SCT
WIND DIR 34 34 35 35 36 34 31 32 33 30 32 32 31 30 29 31 31 31 30 30
WIND SPD 11 7 4 5 4 5 5 4 6 6 6 6 8 8 9 9 10 9 10 9
QP 1H P>.1 2 2 1 2
QP 1H P>.5 0 0 0 0
QP 1H BCAT 0 0 0 0
QP 1H XPVL .00 .00 .00 .00
QP 3H P>.1 5 5
QP 3H P>.5 0 0
QP 3H BCAT 0 0
QP 3H XPVL .01 .01
QP 6H P>.1 M 8 M
QP 6H P>.5 M 0 M
QP 6H BCAT M 0 M
QP 6H XPVL M .01 M
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PROJ = Projection in hours. The projections go out 20 hours with the first projection
being the hour following the LAMP run.
UTC = The Coordinated Universal Time. Goes out 20 hours starting with the hour following
the LAMP run.
TEMP = surface temperature valid at that hour in Fahrenheit.
DEWPT = surface dewpoint valid at that hour in Fahrenheit.
POPO = Probability of precipitation occurring on the hour. The precipitation need not
be measurable.
PRECIP = Whether or not precipitation is expected. A "P" indicates that precipitation is
expected on the hour.
POP06 = Probability of measurable precipitation in a 6-hr period.
PTYPE = Precipitation type. One of five types: pure freezing, frozen, liquid, a mix of
rain and snow, or a mix of snow and freezing.
POZR = Probability of freezing rain.
POSN = Probability of snow.
OBVIS = Obstruction to vision. One of five types: none, haze, smoke, blowing phenomena,
or fog.
VIS CAT = Visibility category. These categories are defined below.
HTc = Cloud heights in hundreds of feet where "c" is the layer reported. The variable
"c" can be of the value 1 through 3.
CVRc = Cloud cover where "c" is the layer reported. The variable "c" can be of the
value 1 through 3.
WNDDIR = Wind direction in tens of degrees.
WNDSPD = Wind speed in knots.
Definitions of Categorical Elements
LAMP Visibility (VIS) Categories
1 < 1/2 miles
2 1/2 - 7/8 miles
3 1 - 2 3/4 miles
4 3 - 5 miles
5 > 5 miles
LAMP Cloud (CLD) Categories
CL clear
SC scattered > 0 to 4 octas
BK broken > 4 to < 8 octas
OV overcast
LAMP 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
LAMP 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
Lamp QPF (BCAT) categories
0 0.00 - 0.09 (in.)
1 0.10 - 0.24 (in.)
2 0.25 - 0.49 (in.)
3 0.50 - 0.99 (in.)
4 1.00 - 1.99 (in.)
5 2.00 or greater (in.)
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