LAMP Elements

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.

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.

Refer to this schematic (pdf) which depicts the thunderstorm projections.

LAMP Elements - MDL

LAMP Elements

Availability of GFS LAMP guidance

LAMP