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

Station:

KNKX

Date/Time:

25 MAR 2019

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)
5 AM Mon 44 42 E 5 3885 5200 0 Blue 0
6 AM Mon 43 41 E 5 3885 5200 0 Blue 0
7 AM Mon 43 41 E 5 3885 5200 0 Blue 0
8 AM Mon 44 42 E 5 3885 5200 0 Blue 0
9 AM Mon 44 43 SE 3 3885 5200 0 Blue 0
10 AM Mon 47 48 SE 6 3885 5200 0 Blue 0
11 AM Mon 49 52 S 7 3885 5200 0 Blue 0
12 Noon Mon 50 54 S 8 3885 5200 0 Blue 0
1 PM Mon 52 56 S 8 3885 5200 0 Blue 0
2 PM Mon 54 57 S 9 3885 5200 0 Blue 0
3 PM Mon 54 56 S 10 3885 5200 0 Blue 0
4 PM Mon 55 55 SW 10 3885 5200 0 Blue 0
5 PM Mon 54 53 SW 12 3885 5200 0 Blue 0
6 PM Mon 54 52 SW 12 3885 5200 0 Blue 0
7 PM Mon 52 50 SW 9 3885 5200 0 Blue 0
8 PM Mon 52 50 S 7 3885 5200 0 Blue 0
9 PM Mon 51 49 SE 6 3885 5200 0 Blue 0
10 PM Mon 50 48 SE 6 3885 5200 0 Blue 0
11 PM Mon 49 47 SE 6 3885 5200 0 Blue 0
12 Midnight Tue 48 46 SE 6 3885 5200 0 Blue 0
1 AM Tue 47 45 SE 6 3885 5200 0 Blue 0
2 AM Tue 46 44 SE 6 3885 5200 0 Blue 0
3 AM Tue 46 44 SE 6 3885 5200 0 Blue 0
4 AM Tue 45 43 SE 5 3885 5200 0 Blue 0
5 AM Tue 44 42 SE 5 3885 5200 0 Blue 0
6 AM Tue 44 42 SE 5 3885 5200 0 Blue 0
7 AM Tue 43 41 SE 5 3885 5200 0 Blue 0
8 AM Tue 43 41 SE 5 3885 5200 0 Blue 0
9 AM Tue 44 43 SE 6 3885 5200 0 Blue 0
10 AM Tue 46 46 S 7 3885 5200 0 Blue 0
11 AM Tue 48 49 S 9 3885 5200 0 Blue 0
12 Noon Tue 49 50 S 10 3885 5200 0 Blue 0
1 PM Tue 51 52 S 12 3885 5200 0 Blue 0
2 PM Tue 52 53 S 12 3885 5200 0 Blue 0
3 PM Tue 53 53 S 13 3885 5200 0 Blue 0
4 PM Tue 53 52 SW 14 3885 5200 0 Blue 0
5 PM Tue 52 50 SW 14 3885 5200 0 Blue 0
6 PM Tue 52 50 S 13 3885 5200 0 Blue 0
7 PM Tue 50 48 S 12 3885 5200 0 Blue 0
8 PM Tue 50 48 S 10 3885 5200 0 Blue 0
9 PM Tue 49 47 S 9 3885 5200 0 Blue 0
10 PM Tue 48 46 S 8 3885 5200 0 Blue 0
11 PM Tue 46 44 SE 8 3885 5200 0 Blue 0
12 Midnight Wed 45 43 S 7 3885 5200 0 Blue 0
1 AM Wed 44 42 S 7 3885 5200 0 Blue 0
2 AM Wed 44 42 S 7 3885 5200 0 Blue 0
3 AM Wed 43 41 S 7 3885 5200 0 Blue 0
4 AM Wed 42 40 S 8 3885 5200 0 Blue 0
5 AM Wed 41 39 S 8 3885 5200 0 Blue 0
6 AM Wed 41 39 S 8 3885 5200 0 Blue 0
7 AM Wed 40 38 S 8 3885 5200 0 Blue 0
8 AM Wed 40 38 S 9 3885 5200 0 Blue 0
9 AM Wed 41 39 S 9 3885 5200 0 Blue 0
10 AM Wed 42 41 S 10 3885 5200 0 Blue 0
11 AM Wed 43 43 S 12 3885 5200 0 Blue 0
12 Noon Wed 44 45 S 13 3885 5200 0 Blue 0
1 PM Wed 45 46 S 15 3885 5200 0 Blue 0
2 PM Wed 45 46 S 16 3885 5200 0 Blue 0
3 PM Wed 46 46 SW 16 3885 5200 0 Blue 0
4 PM Wed 46 45 SW 16 3885 5200 0 Blue 0
5 PM Wed 45 43 SW 16 3885 5200 0 Blue 0
6 PM Wed 45 43 SW 15 3885 5200 0 Blue 0
7 PM Wed 44 42 SW 15 3885 5200 0 Blue 0
8 PM Wed 44 42 SW 14 3885 5200 0 Blue 0
9 PM Wed 43 41 SW 12 3885 5200 0 Blue 0
10 PM Wed 42 40 S 10 3885 5200 0 Blue 0
11 PM Wed 41 39 S 9 3885 5200 0 Blue 0
12 Midnight Thu 40 38 S 9 3885 5200 0 Blue 0
1 AM Thu 40 38 S 10 3885 5200 0 Blue 0
2 AM Thu 40 38 S 10 3885 5200 0 Blue 0
3 AM Thu 39 37 S 9 3885 5200 0 Blue 0
4 AM Thu 39 37 S 9 3885 5200 0 Blue 0
5 AM Thu 38 36 S 8 3885 5200 0 Blue 0
6 AM Thu 37 35 S 8 3885 5200 0 Blue 0
7 AM Thu 37 35 S 8 3885 5200 0 Blue 0
8 AM Thu 37 35 NE 5 3885 5200 0 Blue 0
9 AM Thu 38 36 NE 5 3885 5200 0 Blue 0
10 AM Thu 40 39 NE 5 3885 5200 0 Blue 0
11 AM Thu 41 43 SW 8 3885 5200 0 Blue 0
12 Noon Thu 43 46 SW 8 3885 5200 0 Blue 0
1 PM Thu 44 47 SW 8 3885 5200 0 Blue 0
2 PM Thu 45 48 SW 12 3885 5200 0 Blue 0
3 PM Thu 46 48 SW 12 3885 5200 0 Blue 0
4 PM Thu 46 46 SW 12 3885 5200 0 Blue 0
5 PM Thu 46 45 W 14 3885 5200 0 Blue 0
6 PM Thu 45 43 W 14 3885 5200 0 Blue 0
7 PM Thu 44 42 W 14 3885 5200 0 Blue 0
8 PM Thu 44 42 NW 10 3885 5200 0 Blue 0
9 PM Thu 43 41 NW 10 3885 5200 0 Blue 0
10 PM Thu 43 41 NW 10 3885 5200 0 Blue 0
11 PM Thu 42 40 NW 16 3885 5200 0 Blue 0
12 Midnight Fri 41 39 NW 16 3885 5200 0 Blue 0
1 AM Fri 41 39 NW 16 3885 5200 0 Blue 0
2 AM Fri 40 38 N 18 3885 5200 0 Blue 0
3 AM Fri 40 38 N 18 3885 5200 0 Blue 0
4 AM Fri 40 38 N 18 3885 5200 0 Blue 0
5 AM Fri 39 37 N 20 3885 5200 0 Blue 0
6 AM Fri 38 36 N 20 3885 5200 0 Blue 0
7 AM Fri 38 36 N 20 3885 5200 0 Blue 0
8 AM Fri 38 36 N 20 3885 5200 0 Blue 0
9 AM Fri 40 39 N 20 3885 5200 0 Blue 0
10 AM Fri 42 43 N 20 3885 5200 0 Blue 0
11 AM Fri 44 46 N 18 3885 5200 0 Blue 0
12 Noon Fri 46 49 N 18 3885 5200 0 Blue 0
1 PM Fri 48 51 N 18 3885 5200 0 Blue 0
2 PM Fri 50 53 N 15 3885 5200 0 Blue 0
3 PM Fri 50 52 N 15 3885 5200 0 Blue 0
4 PM Fri 51 51 N 15 3885 5200 0 Blue 0
5 PM Fri 51 50 N 15 3885 5200 0 Blue 0
6 PM Fri 50 48 N 15 3885 5200 0 Blue 0
7 PM Fri 48 46 N 15 3885 5200 0 Blue 0
8 PM Fri 47 45 N 12 3885 5200 0 Blue 0
9 PM Fri 46 44 N 12 3885 5200 0 Blue 0
10 PM Fri 45 43 N 12 3885 5200 0 Blue 0
11 PM Fri 43 41 N 14 3885 5200 0 Blue 0
12 Midnight Sat 42 40 N 14 3885 5200 0 Blue 0
1 AM Sat 41 39 N 14 3885 5200 0 Blue 0
2 AM Sat 40 38 N 18 3885 5200 0 Blue 0
3 AM Sat 40 38 N 18 3885 5200 0 Blue 0
4 AM Sat 39 37 N 18 3885 5200 0 Blue 0
5 AM Sat 37 35 N 21 3885 5200 0 Blue 0
6 AM Sat 37 35 N 21 3885 5200 0 Blue 0
7 AM Sat 36 34 N 21 3885 5200 0 Blue 0
8 AM Sat 37 35 N 25 3885 5200 0 Blue 0
9 AM Sat 38 37 N 25 3885 5200 0 Blue 0
10 AM Sat 41 42 N 25 3885 5200 0 Blue 0
11 AM Sat 43 45 N 28 3885 5200 0 Blue 0
12 Noon Sat 46 49 N 28 3885 5200 0 Blue 0
1 PM Sat 48 51 N 28 3885 5200 0 Blue 0
2 PM Sat 50 53 NE 24 3885 5200 0 Blue 0
3 PM Sat 51 53 NE 24 3885 5200 0 Blue 0
4 PM Sat 52 52 NE 24 3885 5200 0 Blue 0
5 PM Sat 52 51 NE 23 3885 5200 0 Blue 0
6 PM Sat 51 49 NE 23 3885 5200 0 Blue 0
7 PM Sat 49 47 NE 23 3885 5200 0 Blue 0
8 PM Sat 48 46 N 18 3885 5200 0 Blue 0
9 PM Sat 47 45 N 18 3885 5200 0 Blue 0
10 PM Sat 46 44 N 18 3885 5200 0 Blue 0
11 PM Sat 45 43 NE 20 3885 5200 0 Blue 0
12 Midnight Sun 43 41 NE 20 3885 5200 0 Blue 0
1 AM Sun 43 41 NE 20 3885 5200 0 Blue 0
2 AM Sun 42 40 NE 23 3885 5200 0 Blue 0
3 AM Sun 42 40 NE 23 3885 5200 0 Blue 0
4 AM Sun 41 39 NE 23 3885 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