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Description of the Eta MET MOS Alphanumeric Message
The Eta-Based MOS MET guidance is generated from 0000 UTC and 1200 UTC model output from the Environmental
Modeling Center's Eta Model.
This guidance is valid for stations in the Continental United States, Alaska, Hawaii, Puerto Rico, and the
U.S. Virgin Islands. For the most recent station list
click here.
Forecast elements are valid from 6 to 72 hours in advance.
Sample Message
KDCA ETA MOS GUIDANCE 1/24/2004 1200 UTC
DT /JAN 24/JAN 25 /JAN 26 /JAN 27
HR 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 06 12
N/X 15 24 20 30 28
TMP 36 35 30 24 21 18 16 21 23 22 23 21 20 21 22 24 27 29 29 29 30
DPT 14 9 3 0 -2 -4 -3 -3 -2 2 8 12 15 17 19 22 24 25 25 24 21
CLD CL CL FW FW SC SC BK OV OV OV OV OV OV OV OV OV OV OV OV BK FW
WDR 34 33 34 35 34 36 36 06 14 08 05 04 02 02 03 05 05 06 03 35 34
WSP 07 14 14 11 10 10 08 03 02 05 07 11 11 12 10 07 04 04 07 11 10
P06 0 0 0 0 55 76 60 34 36 13 9
P12 0 58 86 48 25
Q06 0 0 0 0 1 1 1 0 1 0
Q12 0 1 2 1 0
T06 0/ 0 0/ 9 0/ 1 1/ 0 3/ 0 0/ 0 0/ 1 0/ 0 3/ 0 0/ 0
T12 1/ 9 1/ 1 3/ 0 1/ 1 1/ 0
SNW 0 6 0
CIG 6 8 8 8 8 7 7 7 7 4 4 3 2 3 3 2 2 1 1 2 8
VIS 7 7 4 5 5 5 6 7 7 7 7 7 7 7 7 7 7 7 7 6 5
OBV N N BR BR BR BR N N N N N N N N N N N N N HZ BR
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DT = The day of the month, denoted by the standard three or four letter abbreviation
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HR = 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.
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N/X = nighttime minimum/daytime maximum surface temperatures.
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TMP = surface temperature valid at that hour.
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DPT = surface dewpoint valid at that hour.
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CLD = forecast categories of total sky cover valid at that hour.
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WDR = forecasts of the 10-meter wind direction at the hour, given in tens of degrees.
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WSP = forecasts of the 10-meter wind speed at the hour, given in knots.
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P06 = probability of precipitation (PoP) during a 6-h period ending at that time.
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P12 = PoP during a 12-h period ending at that time.
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Q06 = quantitative precipitation forecast (QPF) category for liquid equivalent precipitation amount during a 6-h period ending at that time.
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Q12 = QPF category for liquid equivalent precipitation amount during a 12-h period ending at the indicated time.
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T06 = probability of thunderstorms/conditional probability of severe thunderstorms during the 6-hr peri
od ending at the indicated time.
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T12 = probability of thunderstorms/conditional probability of severe thunderstorms during the 12-hr per
iod ending at the indicated time.
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SNW = snow fall categorical forecasts during a 24-h period ending at the indicated time.
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CIG = ceiling height categorical forecasts at the hour.
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VIS = visibility categorical forecasts at the hour.
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OBV = obstruction to vision categorical forecasts at the hour.
Definitions of Categorical Elements
MET QPF Categories
0 | no precipitation |
1 | 0.01 to 0.09 inches |
2 | 0.10 to 0.24 inches |
3 | 0.25 to 0.49 inches |
4 | 0.50 to 0.99 inches |
5 | 1.00 to 1.99 inches |
6 | 2.00 inches or greater |
MET Snow Fall Amount Categories
0 | no snow or a trace expected |
1 | > a trace to < 2 inches |
2 | 2 to < 4 inches |
4 | 4 to < 6 inches |
6 | 6 to < 8 inches |
8 | >= 8 inches |
MET Visibility (VIS) 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 |
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MET Ceiling Height (CLD) 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 |
MET Cloud (CLD) Categories
CL | clear |
FW | > 0 to 2 octas of total sky cover |
SC | > 2 to 4 octas of total sky cover
| BK | > 4 to < 8 octas of total sky cover |
OV | 8 octas of total sky cover or totally obscured |
MAV 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 |
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Page last Modified:
Monday, 25 February 2008 17:33 UTC
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