State Surface Data - Text
After selecting a state by clicking the mouse pointer on its
postal identity
code from the selection table, the following sample display of selected
weather
conditions for the reporting stations in that state is given.
Data for CO
|
18Z 25 OCT 2010
|
HH |
STN |
TMP |
DEW |
DIR |
SPD |
GST |
CLDL |
CLDM |
CLDH |
ALT |
PMSL |
PTD |
WTHR |
PCPN |
SNOW |
18 |
ALS |
53 |
36 |
23 |
28 |
43 |
CLR |
|
|
29.49 |
992.0 |
-1.3 |
|
|
|
18 |
DRO |
47 |
43 |
26 |
21 |
30 |
OVC |
|
|
29.60 |
999.2 |
-2.8 |
R |
0.04 |
|
18 |
LAA |
65 |
35 |
35 |
22 |
38 |
CLR |
|
|
29.24 |
987.1 |
1.5 |
|
|
|
18 |
PUB |
62 |
35 |
36 |
20 |
26 |
CLR |
|
|
29.36 |
990.3 |
2.7 |
|
|
|
18 |
TAD |
69 |
32 |
29 |
32 |
46 |
CLR |
|
|
29.29 |
984.9 |
-2.9 |
|
|
|
18 |
COS |
50 |
35 |
35 |
16 |
24 |
|
BKN |
|
29.40 |
990.7 |
1.7 |
|
|
|
18 |
ASE |
25 |
25 |
34 |
7 |
|
OVC |
|
|
29.66 |
1001.0 |
1.2 |
S I |
0.35 |
|
18 |
GJT |
47 |
37 |
36 |
3 |
|
|
SCT |
|
29.70 |
1002.4 |
1.2 |
|
0.33 |
|
18 |
GXY |
54 |
23 |
28 |
15 |
18 |
|
BKN |
|
29.38 |
|
0.0 |
|
|
|
18 |
DEN |
49 |
35 |
23 |
6 |
|
SCT |
BKN |
|
29.43 |
992.2 |
1.9 |
|
|
|
The tabular set of weather conditions at the stations [in this
example, the
state
of Colorado (CO)] contains:
A tabular listing of surface data reported for the state (in
postal code
abbreviation) is given. Hour and date follow the state heading. Tabular
column values are:
- HH -- hour in Z (UTC) when observation
was taken.
- STN -- usually three letter coded
station identifier, see
Surface Weather Stations.
- TMP -- temperature in degrees
Fahrenheit.
- DWP -- dewpoint in degrees Fahrenheit.
- DIR -- compass wind direction in tens
of
degrees from true North, a north wind (from the
north) is 36, east 9, calm 0
- SPD -- wind speed in knots (nautical
miles per hour).
- GST -- maximum speed of brief wind gusts
in knots.
- Cloud coverage information divided into three levels:
CLDL, "low" - up to 5000 feet (1524 m)
CLDM, "middle" - from 5000 to 10,000 ft (3049 m)
CLDH, "high" - above 10,000 ft
- extent of cloud coverage of the sky at the
particular level:
"CLR" - clear, no clouds detected
"F" - few, 1/8 to 2/8 sky covered at that level
(also shown as
-S)
"SCT" - scattered, 3/8 to 4/8 sky covered
"BKN" - broken, 5/8 to 7/8 covered
"OVC" - overcast, 8/8 covered
"X" - obscured, clear base not observed due to fog,
haze, etc.
- ALT -- aircraft altimeter setting in
inches of mercury.
- PMSL -- mean sea-level pressure in
tenths of millibars.
- PTD -- pressure tendency in tenths of
millibars, change over the
previous 3 hours. Given at 00Z, 03Z, etc. e.g.
-1.3, pressure now lower
by one and 3/10 of mb.
- WTHR -- present weather condition,
letter code, if obstruction to
visibility, e.g. R for rain, S
for snow, I for ice
pellets ("sleet").
- PCPN -- precipitation (if any) in
hundredths of inches, given at
00Z, 03Z, etc.
- SNOW -- snowfall (if any) in tenths of
inches, given at 00Z, 03Z,
etc.
Definitions and rules for surface observations can be found in
Federal
Meteorological Handbook
No. 1.