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Localized Aviation MOS Program


NWS/OST/MDL: January 3, 2005

 

Availability of GFS LAMP guidance

 

Guidance is currently available from the start times of: 0000, 0100, 0200, 0300, 0400, 0500, 0600, 0700, 0800, 0900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200 and 2300 UTC (LAMP now runs for each hour of the day) GFS-LAMP guidance will be available from all hours in the future. Projections refer to the number of hours after the cycle time.

 

Table 1 :  Projections for which the GFS LAMP guidance temperature, dewpoint, winds, probability of precipitation occurring on the hour, best category forecasts for precipitation occurring on the hour, precipitation type, total sky cover, ceiling height, conditional ceiling height, visibility, conditional visibility, and obstruction to vision forecasts are issued. 

 

Element

Projection in Hours from Cycle Time

Temperature

Every 1-h from 1 to 25 hours

Dewpoint

Every 1-h from 1 to 25 hours

Wind Direction

Every 1-h from 1 to 25 hours

Wind Speed

Every 1-h from 1 to 25 hours

Wind Gusts

Every 1-h from 1 to 25 hours

Probability of Precipitation occurring on the hour

Every 1-h from 1 to 25 hours

Best Category (yes/no) for precipitation occurring on the hour

Every 1-h from 1 to 25 hours

Precipitation Type

Every 1-h from 1 to 25 hours

Total Sky Cover

Every 1-h from 1 to 25 hours

Ceiling Height

Every 1-h from 1 to 25 hours

Conditional Ceiling Height

Every 1-h from 1 to 25 hours

Visibility

Every 1-h from 1 to 25 hours

Conditional Visibility

Every 1-h from 1 to 25 hours

Obstruction to Vision

Every 1-h from 1 to 25 hours

 

Table 2 : Projections for which the GFS LAMP guidance forecasts of probability of precipitation in a 6-h period are issued. Guidance is provided for all projections that (1) fall on the valid times of 0000, 0600, 1200, and 1800 UTC, and (2) are at least 6 hours into the forecast period.

 

Element

Cycle Time

Projection in Hours from Cycle Time

Probability of Precipitation in a 6-h period

0000 UTC

Every 6-h from 6 to 25 hours

0100 UTC

Every 6-h from 11 to 25 hours

0200 UTC

Every 6-h from 10 to 25 hours

0300 UTC

Every 6-h from 9 to 25 hours

0400 UTC

Every 6-h from 8 to 25 hours

0500 UTC

Every 6-h from 7 to 25 hours

0600 UTC

Every 6-h from 6 to 25 hours

0700 UTC

Every 6-h from 11 to 25 hours

0800 UTC

Every 6-h from 10 to 25 hours

0900 UTC

Every 6-h from 9 to 25 hours

1000 UTC

Every 6-h from 8 to 25 hours

1100 UTC

Every 6-h from 7 to 25 hours

1200 UTC

Every 6-h from 6 to 25 hours

1300 UTC

Every 6-h from 11 to 25 hours

1400 UTC

Every 6-h from 10 to 25 hours

1500 UTC

Every 6-h from 9 to 25 hours

1600 UTC

Every 6-h from 8 to 25 hours

1700 UTC

Every 6-h from 7 to 25 hours

1800 UTC

Every 6-h from 6 to 25 hours

1900 UTC

Every 6-h from 11 to 25 hours

2000 UTC

Every 6-h from 10 to 25 hours

2100 UTC

Every 6-h from 9 to 25 hours

2200 UTC

Every 6-h from 8 to 25 hours

2300 UTC

Every 6-h from 7 to 25 hours

 

Table 3:  Projections for which the GFS LAMP guidance forecasts of probability of precipitation in a 12-h period are issued.   Guidance is provided for all projections that (1) fall on the valid times of 0000, 0600, 1200, and 1800 UTC, and (2) are at least 12 hours into the forecast period.

 

Element

Cycle Time

Projection in Hours from Cycle Time

Probability of Precipitation in a 12-h period

0000 UTC

Every 6-h from 12 to 25 hours

0100 UTC

Every 6-h from 17 to 25 hours

0200 UTC

Every 6-h from 16 to 25 hours

0300 UTC

Every 6-h from 15 to 25 hours

0400 UTC

Every 6-h from 14 to 25 hours

0500 UTC

Every 6-h from 13 to 25 hours

0600 UTC

Every 6-h from 12 to 25 hours

0700 UTC

Every 6-h from 17 to 25 hours

0800 UTC

Every 6-h from 16 to 25 hours

0900 UTC

Every 6-h from 15 to 25 hours

1000 UTC

Every 6-h from 14 to 25 hours

1100 UTC

Every 6-h from 13 to 25 hours

1200 UTC

Every 6-h from 12 to 25 hours

1300 UTC

Every 6-h from 17 to 25 hours

1400 UTC

Every 6-h from 16 to 25 hours

1500 UTC

Every 6-h from 15 to 25 hours

1600 UTC

Every 6-h from 14 to 25 hours

1700 UTC

Every 6-h from 13 to 25 hours

1800 UTC

Every 6-h from 12 to 25 hours

1900 UTC

Every 6-h from 17 to 25 hours

2000 UTC

Every 6-h from 16 to 25 hours

2100 UTC

Every 6-h from 15 to 25 hours

2200 UTC

Every 6-h from 14 to 25 hours

2300 UTC

Every 6-h from 13 to 25 hours

 

Table 4:  Projections for which the GFS LAMP guidance forecasts of probability of thunderstorms in a 2-h period and best category thunderstorm occurrence are issued.

 

Element

Projection in Hours from Cycle Time

Probability of Thundstorms in a 2-h period

2-h periods ending every hour in the first 2-6 hours after issuance, and ending every even GMT hour thereafter out to 25 hours.

For example:

Odd start times have 2-h guidance valid from 1-3h, 2-4h, 3-5h, 4-6h, 5-7h, and then 7-9h, 9-11h, 11-13h, 13-15h, 15-17h, 17-19h, 19-21h, 21-23h, and 23-25h.

Even start times have 2-h guidance valid from 1-3h, 2-4h, 3-5h, 4-6h, 5-7h, 6-8h, and then 8-10h, 10-12h, 12-14h, 14-16h, 16-18h, 18-20h, 20-22h, 22-24h.

Best Category (yes/no) for thunderstorms  occurring in the 2-h period

Same projections as for Probability of Thunderstorms above.


For a schematic depicting the thunderstorm projections, please click here (pdf format).

 


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Page Last Modified: December 10, 2007. 16:06  UTC