NWS/OST/MDL: January 3, 2005
Availability of GFS LAMP guidance
Guidance is currently available from the start times of:
0000, 0100, 0300, 0400, 0500, 0600, 0700, 0900, 1000, 1100, 1200,
1300, 1500, 1800, 1900, and 2100 UTC (The next cycles planned are:
1600, 1700, 2200, and 2300 UTC, and will be effective 3rd Quarter
FY08).
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).
www.nws.noaa.gov
