Detailed Predictions for: Crestline
Launch Altitude (f): 5200
LZ Altitude (f): 1700
Sounding

Station:

KNKX

Date/Time:

25 NOV 2020

Temp/Wind data from:

NOAA Digital Forecast

Site Forecasts
Time
(Local)
High
Temp

Puddle
Temp

Wind
(mph)
Thermal
Ceiling

(ft)
Soaring
Ceiling

(ft)
Above
Launch

(ft)
Thermal
Type
Thermal
Index

(F)
4 AM Wed 46 44 SW 3 3366 5200 0 Blue 0
5 AM Wed 45 43 SW 3 3366 5200 0 Blue 0
6 AM Wed 45 43 SW 3 3366 5200 0 Blue 0
7 AM Wed 46 44 S 3 3366 5200 0 Blue 0
8 AM Wed 48 46 S 5 3366 5200 0 Blue 0
9 AM Wed 50 49 S 5 3366 5200 0 Blue 0
10 AM Wed 52 52 S 6 3366 5200 0 Blue 0
11 AM Wed 54 54 S 7 3440 5200 0 Blue 0
12 Noon Wed 53 54 S 7 3440 5200 0 Blue 0
1 PM Wed 54 54 S 8 3440 5200 0 Blue 0
2 PM Wed 53 52 S 7 3366 5200 0 Blue 0
3 PM Wed 53 51 S 7 3366 5200 0 Blue 0
4 PM Wed 52 50 S 6 3366 5200 0 Blue 0
5 PM Wed 50 48 S 6 3366 5200 0 Blue 0
6 PM Wed 48 46 S 5 3366 5200 0 Blue 0
7 PM Wed 46 44 S 5 3366 5200 0 Blue 0
8 PM Wed 44 42 S 5 3366 5200 0 Blue 0
9 PM Wed 43 41 S 6 3366 5200 0 Blue 0
10 PM Wed 43 41 S 6 3366 5200 0 Blue 0
11 PM Wed 43 41 S 6 3366 5200 0 Blue 0
12 Midnight Thu 44 42 E 7 3366 5200 0 Blue 0
1 AM Thu 44 42 NE 8 3366 5200 0 Blue 0
2 AM Thu 43 41 NE 13 3366 5200 0 Blue 0
3 AM Thu 42 40 NE 17 3366 5200 0 Blue 0
4 AM Thu 40 38 N 22 3366 5200 0 Blue 0
5 AM Thu 38 36 N 24 3366 5200 0 Blue 0
6 AM Thu 37 35 N 25 3366 5200 0 Blue 0
7 AM Thu 37 35 N 26 3366 5200 0 Blue 0
8 AM Thu 38 36 N 26 3366 5200 0 Blue 0
9 AM Thu 39 38 N 28 3366 5200 0 Blue 0
10 AM Thu 41 41 N 28 3366 5200 0 Blue 0
11 AM Thu 43 43 N 29 3366 5200 0 Blue 0
12 Noon Thu 45 46 N 29 3366 5200 0 Blue 0
1 PM Thu 46 46 N 29 3366 5200 0 Blue 0
2 PM Thu 46 45 N 29 3366 5200 0 Blue 0
3 PM Thu 47 45 N 29 3366 5200 0 Blue 0
4 PM Thu 46 44 N 30 3366 5200 0 Blue 0
5 PM Thu 45 43 N 31 3366 5200 0 Blue 0
6 PM Thu 43 41 N 32 3366 5200 0 Blue 0
7 PM Thu 42 40 N 33 3366 5200 0 Blue 0
8 PM Thu 41 39 N 32 3366 5200 0 Blue 0
9 PM Thu 40 38 N 32 3366 5200 0 Blue 0
10 PM Thu 39 37 N 31 3366 5200 0 Blue 0
11 PM Thu 38 36 N 31 3366 5200 0 Blue 0
12 Midnight Fri 37 35 N 32 3366 5200 0 Blue 0
1 AM Fri 36 34 N 33 3366 5200 0 Blue 0
2 AM Fri 36 34 N 33 3366 5200 0 Blue 0
3 AM Fri 36 34 N 35 3366 5200 0 Blue 0
4 AM Fri 36 34 N 33 3366 5200 0 Blue 0
5 AM Fri 35 33 N 32 3366 5200 0 Blue 0
6 AM Fri 35 33 N 30 3366 5200 0 Blue 0
7 AM Fri 36 34 N 28 3366 5200 0 Blue 0
8 AM Fri 37 35 N 29 3366 5200 0 Blue 0
9 AM Fri 39 38 N 30 3366 5200 0 Blue 0
10 AM Fri 41 41 N 30 3366 5200 0 Blue 0
11 AM Fri 43 43 N 26 3366 5200 0 Blue 0
12 Noon Fri 45 46 N 23 3366 5200 0 Blue 0
1 PM Fri 46 46 N 21 3366 5200 0 Blue 0
2 PM Fri 47 46 N 20 3366 5200 0 Blue 0
3 PM Fri 46 44 N 21 3366 5200 0 Blue 0
4 PM Fri 47 45 N 21 3366 5200 0 Blue 0
5 PM Fri 46 44 N 20 3366 5200 0 Blue 0
6 PM Fri 44 42 N 17 3366 5200 0 Blue 0
7 PM Fri 42 40 N 16 3366 5200 0 Blue 0
8 PM Fri 41 39 N 15 3366 5200 0 Blue 0
9 PM Fri 40 38 N 16 3366 5200 0 Blue 0
10 PM Fri 40 38 N 16 3366 5200 0 Blue 0
11 PM Fri 42 40 N 16 3366 5200 0 Blue 0
12 Midnight Sat 43 41 NE 16 3366 5200 0 Blue 0
1 AM Sat 45 43 NE 15 3366 5200 0 Blue 0
2 AM Sat 45 43 NE 15 3366 5200 0 Blue 0
3 AM Sat 44 42 NE 16 3366 5200 0 Blue 0
4 AM Sat 43 41 NE 16 3366 5200 0 Blue 0
5 AM Sat 43 41 NE 16 3366 5200 0 Blue 0
6 AM Sat 43 41 NE 16 3366 5200 0 Blue 0
7 AM Sat 43 41 N 14 3366 5200 0 Blue 0
8 AM Sat 44 42 N 14 3366 5200 0 Blue 0
9 AM Sat 46 45 N 14 3366 5200 0 Blue 0
10 AM Sat 47 47 N 13 3366 5200 0 Blue 0
11 AM Sat 49 49 N 13 3366 5200 0 Blue 0
12 Noon Sat 50 50 N 13 3366 5200 0 Blue 0
1 PM Sat 51 51 N 10 3366 5200 0 Blue 0
2 PM Sat 52 51 N 10 3366 5200 0 Blue 0
3 PM Sat 51 49 N 10 3366 5200 0 Blue 0
4 PM Sat 52 50 N 9 3366 5200 0 Blue 0
5 PM Sat 51 49 N 9 3366 5200 0 Blue 0
6 PM Sat 49 47 N 9 3366 5200 0 Blue 0
7 PM Sat 48 46 N 7 3366 5200 0 Blue 0
8 PM Sat 47 45 N 7 3366 5200 0 Blue 0
9 PM Sat 46 44 N 7 3366 5200 0 Blue 0
10 PM Sat 45 43 N 9 3366 5200 0 Blue 0
11 PM Sat 45 43 N 9 3366 5200 0 Blue 0
12 Midnight Sun 45 43 N 9 3366 5200 0 Blue 0
1 AM Sun 44 42 N 13 3366 5200 0 Blue 0
2 AM Sun 44 42 N 13 3366 5200 0 Blue 0
3 AM Sun 44 42 N 13 3366 5200 0 Blue 0
4 AM Sun 43 41 NE 20 3366 5200 0 Blue 0
5 AM Sun 43 41 NE 20 3366 5200 0 Blue 0
6 AM Sun 43 41 NE 20 3366 5200 0 Blue 0
7 AM Sun 44 42 N 14 3366 5200 0 Blue 0
8 AM Sun 44 42 N 14 3366 5200 0 Blue 0
9 AM Sun 46 45 N 14 3366 5200 0 Blue 0
10 AM Sun 47 46 N 13 3366 5200 0 Blue 0
11 AM Sun 48 48 N 13 3366 5200 0 Blue 0
12 Noon Sun 49 49 N 13 3366 5200 0 Blue 0
1 PM Sun 50 50 N 10 3366 5200 0 Blue 0
2 PM Sun 51 50 N 10 3366 5200 0 Blue 0
3 PM Sun 50 48 N 10 3366 5200 0 Blue 0
4 PM Sun 51 49 N 9 3366 5200 0 Blue 0
5 PM Sun 50 48 N 9 3366 5200 0 Blue 0
6 PM Sun 49 47 N 9 3366 5200 0 Blue 0
7 PM Sun 48 46 NE 8 3366 5200 0 Blue 0
8 PM Sun 47 45 NE 8 3366 5200 0 Blue 0
9 PM Sun 47 45 NE 8 3366 5200 0 Blue 0
10 PM Sun 46 44 N 10 3366 5200 0 Blue 0
11 PM Sun 46 44 N 10 3366 5200 0 Blue 0
12 Midnight Mon 45 43 N 10 3366 5200 0 Blue 0
1 AM Mon 45 43 N 10 3366 5200 0 Blue 0
2 AM Mon 45 43 N 10 3366 5200 0 Blue 0
3 AM Mon 45 43 N 10 3366 5200 0 Blue 0
4 AM Mon 45 43 NE 13 3366 5200 0 Blue 0
5 AM Mon 45 43 NE 13 3366 5200 0 Blue 0
6 AM Mon 45 43 NE 13 3366 5200 0 Blue 0
7 AM Mon 46 44 NE 7 3366 5200 0 Blue 0
8 AM Mon 48 46 NE 7 3366 5200 0 Blue 0
9 AM Mon 51 49 NE 7 3366 5200 0 Blue 0
10 AM Mon 54 53 SE 3 3366 5200 0 Blue 0
11 AM Mon 56 55 SE 3 3591 5200 0 Blue 0
12 Noon Mon 57 56 SE 3 3742 5200 0 Blue 0
1 PM Mon 56 55 S 6 3591 5200 0 Blue 0
2 PM Mon 57 56 S 6 3742 5200 0 Blue 0
3 PM Mon 56 54 S 6 3440 5200 0 Blue 0
4 PM Mon 55 53 S 5 3366 5200 0 Blue 0
5 PM Mon 53 51 S 5 3366 5200 0 Blue 0
6 PM Mon 51 49 S 5 3366 5200 0 Blue 0
7 PM Mon 50 48 S 5 3366 5200 0 Blue 0
8 PM Mon 48 46 S 5 3366 5200 0 Blue 0
9 PM Mon 48 46 S 5 3366 5200 0 Blue 0
10 PM Mon 47 45 S 5 3366 5200 0 Blue 0
11 PM Mon 46 44 S 5 3366 5200 0 Blue 0
12 Midnight Tue 45 43 S 5 3366 5200 0 Blue 0
1 AM Tue 45 43 SE 6 3366 5200 0 Blue 0
2 AM Tue 44 42 SE 6 3366 5200 0 Blue 0
3 AM Tue 44 42 SE 6 3366 5200 0 Blue 0

DISCLAIMER: These estimates are intended to assist in daily site selection only.  No warranty is made concerning the accuracy of these estimates.  These estimates cannot be used to determine if conditions are safe for flying.  Conditions should be evaluated at the launch site by experienced pilots before launching.

Sounding: This is the site at which the weather balloon was released.  If the flying site predicted is far from the sounding site, the estimate is not valid.  Also, the sounding is done at 12Z (4AM PST).  If a front comes through, the sounding is no longer valid. The sounding becomes less valid later in the day.

Thermal Ceiling: the lower of the height at which the thermal stops rising and the cloud level.  We can't fly into the clouds, so it doesn't matter how much higher the thermal goes.  Remember that we can't get to the top of the thermal because of our sink rate.  Our upper limit will be lower than the reported ceiling.

Soaring Ceiling: We will stop going up when the thermal is rising just fast enough to offset our sink.  It is estimated that this happens when the temperature difference between the thermal and the surrounding air is about 2 degrees F. This number is an estimate of the maximum altitude we might reach if we start at launch height, and should be more reflective of our chances of soaring than the thermal top. Please let me know how this compares with actually flying, and I will adjust it as necessary.

Above Launch: The difference between how high we might get and how high we start. This estimate does not account for ridge lift.

High Temp: This estimate is taken from the National Weather Service website.  Puddle temperatures can exceed this temperature. 

Puddle Temp: This estimate is based on the High Temp and the National Weather Service estimate of cloudiness, and the angle of the sun.  When the sun is directly overhead on a sunny day, the puddle temp is esimated to be 25 degrees warmer than the high ambient temperature. This estimate now includes a rigorous calculation of the Sun Angle, and accounts for the seasonal differences in zenith and daylight hours.

Wind: This estimate is taken from the National Weather Service website.

Thermal Type: Blue (no cloud formation) or White (Cloud formation)

Thermal Index: This is the maximum difference in temperature between the rising packet of air (the thermal) and the surrounding air.  The difference in temperature is responsible for the buoyancy of the thermal, and larger temperature differences mean faster rising thermals.  A value of about 10 F or greater often means that the conditions are soarable.  Values above 20 could indicate rowdy thermals.

Validity of estimate: Many factors (including strong wind, fronts, cloud shadows, incorrectly predicted temperatures, etc) can affect the validity of the estimates. 

Author: Tad Hurst