|
| 1. Station...in this case LIT for Little Rock, AR |
| 2. Date/Time of Guidance...in this case 10/31/00 at 1200
UTC |
| Note: "UTC" is "Coodinated
Universal Time" or "Z" Time. A new day begins at 0000 UTC (600 pm CST or
700 pm CDT)...not at midnight. Guidance is available at 0000 UTC and 1200 UTC (600 am CST
or 700 pm CDT). |
|
| 3. UTC Time or Z Time every three (3) hours |
| Note: The time begins 6 hours after the guidance
valid time. So, 3-hourly time will start at 18Z (1200 pm CST or 100 pm CDT) on the 1200
UTC run and at 06Z (1200 am CST or 100 am CDT) on the 0000 UTC run. |
|
| 4. Minimum/Maximum Temperatures every twelve (12) hours |
| 5. Temperatures every three (3) hours |
| 6. Dewpoints every three (3) hours |
| 7. Sky Conditions every three (3) hours |
| Note: "CL" means few if any clouds
(less than 1/10 of the sky is covered), "SC" means scattered clouds (1/10 to
5/10 of the sky is covered), "BK" means broken clouds (6/10 to 9/10 of the sky
is covered) and "OV" means overcast skies (10/10 of the sky is covered).
|
|
| 8. Wind Direction every three (3) hours |
| Note: "09" is an east wind,
"18" is a south wind, "27" is a west wind and "36" is a
north wind. |
|
| 9. Wind Speed every three (3) hours |
| Note: Speed is in knots. For mph, multiply the
speed by 1.15. |
|
| 10. Chance of Precipitation every six (6) hours (in %) |
| 11. Chance of Precipitation every twelve (12) hours (in
%) |
| 12. Amount of Precipitation every six (6) hours |
| Note: "0" indicates no precipitation,
"1" means .01 to .09, "2" means .10 to .24, "3" means .25 to
.49, "4" means .50 to .99, "5" means 1.00 to 1.99 and "6"
means 2.00 inches or more precipitation. Amounts are formatted as such: x/y. The
first number (x) is the expected 6 hourly amount and the second number (y) is the 12
hourly amount. |
|
| 13. Chance of Thunderstorms every six (6) hours |
| Note: Chances are formatted as such: x/y. The
first number (x) is the chance of thunderstorms (in %) in general and the second number is
the chance of severe storms (in %). |
|
| 14. Chance of Thunderstorms every twelve (12) hours |
| 15. Precipitation Type |
| Note: "R" is rain, "Z" is
freezing rain or sleet and "S" is snow. |
|
| 16. Probability of freezing rain or sleet in % (if
precipitating) |
| 17. Probability of snow in % (if precipitating) |
| 18. Snow Amount |
| Note: "0" indicates no snow,
"1" means a trace (flurries) to 2 inches, "2" means 2 to 4 inches,
"4" means 4 to 6 inches and "6" means more than 6 inches.
Amounts are formatted as such: x/y. The first number (x) is the expected 6 hourly amount
and the second number (y) is the 12 hourly amount. |
|
| 19. Ceiling (cloud heights) |
| Note: "1" is less than 200 feet,
"2" is 200 to 400 feet, "3" is 500 to 900 feet, "4" is 1000
to 3000 feet, "5" is 3100 to 6500 feet, "6" is 6600 to 12000
feet and "7" is more than 12000 feet. |
|
| 20. Visibility |
| Note: "1" is less than 1/2 mile,
"2" is 1/2 to 7/8 mile, "3" is 1 to 2 3/4 mile, "4" is 3 to
5 miles and "5" is more than 5 miles. |
|
| 21. Obstruction to Visibility |
| Note: "F" is fog, "H" is haze
and "N" is no fog or haze. |
|
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