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

Station:

KNKX

Date/Time:

26 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 Tue 46 44 SE 2 3268 5200 0 Blue 0
6 AM Tue 45 43 SE 3 3268 5200 0 Blue 0
7 AM Tue 45 43 SE 3 3268 5200 0 Blue 0
8 AM Tue 45 43 SE 3 3268 5200 0 Blue 0
9 AM Tue 46 45 S 3 3268 5200 0 Blue 0
10 AM Tue 48 48 S 5 3268 5200 0 Blue 0
11 AM Tue 49 50 S 8 3268 5200 0 Blue 0
12 Noon Tue 51 52 S 9 3268 5200 0 Blue 0
1 PM Tue 52 53 S 10 3268 5200 0 Blue 0
2 PM Tue 53 54 S 12 3268 5200 0 Blue 0
3 PM Tue 54 54 S 13 3268 5200 0 Blue 0
4 PM Tue 53 52 SW 13 3268 5200 0 Blue 0
5 PM Tue 54 52 SW 14 3268 5200 0 Blue 0
6 PM Tue 53 51 SW 13 3268 5200 0 Blue 0
7 PM Tue 52 50 S 12 3268 5200 0 Blue 0
8 PM Tue 51 49 S 9 3268 5200 0 Blue 0
9 PM Tue 51 49 S 8 3268 5200 0 Blue 0
10 PM Tue 50 48 S 8 3268 5200 0 Blue 0
11 PM Tue 50 48 S 7 3268 5200 0 Blue 0
12 Midnight Wed 49 47 S 7 3268 5200 0 Blue 0
1 AM Wed 48 46 S 6 3268 5200 0 Blue 0
2 AM Wed 47 45 S 6 3268 5200 0 Blue 0
3 AM Wed 47 45 S 7 3268 5200 0 Blue 0
4 AM Wed 47 45 S 6 3268 5200 0 Blue 0
5 AM Wed 46 44 S 7 3268 5200 0 Blue 0
6 AM Wed 45 43 S 7 3268 5200 0 Blue 0
7 AM Wed 45 43 S 7 3268 5200 0 Blue 0
8 AM Wed 45 43 S 7 3268 5200 0 Blue 0
9 AM Wed 45 43 S 8 3268 5200 0 Blue 0
10 AM Wed 46 45 S 9 3268 5200 0 Blue 0
11 AM Wed 47 47 S 12 3268 5200 0 Blue 0
12 Noon Wed 48 48 S 13 3268 5200 0 Blue 0
1 PM Wed 48 49 S 14 3268 5200 0 Blue 0
2 PM Wed 49 49 S 14 3268 5200 0 Blue 0
3 PM Wed 49 49 SW 15 3268 5200 0 Blue 0
4 PM Wed 48 47 SW 15 3268 5200 0 Blue 0
5 PM Wed 49 47 SW 15 3268 5200 0 Blue 0
6 PM Wed 48 46 SW 14 3268 5200 0 Blue 0
7 PM Wed 48 46 SW 13 3268 5200 0 Blue 0
8 PM Wed 47 45 SW 12 3268 5200 0 Blue 0
9 PM Wed 47 45 SW 12 3268 5200 0 Blue 0
10 PM Wed 46 44 S 12 3268 5200 0 Blue 0
11 PM Wed 46 44 S 12 3268 5200 0 Blue 0
12 Midnight Thu 46 44 S 10 3268 5200 0 Blue 0
1 AM Thu 45 43 S 10 3268 5200 0 Blue 0
2 AM Thu 45 43 S 9 3268 5200 0 Blue 0
3 AM Thu 44 42 S 9 3268 5200 0 Blue 0
4 AM Thu 44 42 S 8 3268 5200 0 Blue 0
5 AM Thu 43 41 S 8 3268 5200 0 Blue 0
6 AM Thu 43 41 S 7 3268 5200 0 Blue 0
7 AM Thu 43 41 SE 6 3268 5200 0 Blue 0
8 AM Thu 43 41 SE 5 3268 5200 0 Blue 0
9 AM Thu 44 43 S 6 3268 5200 0 Blue 0
10 AM Thu 45 45 S 7 3268 5200 0 Blue 0
11 AM Thu 46 48 S 8 3268 5200 0 Blue 0
12 Noon Thu 47 50 S 9 3268 5200 0 Blue 0
1 PM Thu 48 51 SW 10 3268 5200 0 Blue 0
2 PM Thu 48 51 SW 12 3268 5200 0 Blue 0
3 PM Thu 49 50 SW 13 3268 5200 0 Blue 0
4 PM Thu 48 48 SW 13 3268 5200 0 Blue 0
5 PM Thu 49 48 SW 13 3268 5200 0 Blue 0
6 PM Thu 48 46 SW 13 3268 5200 0 Blue 0
7 PM Thu 46 44 W 12 3268 5200 0 Blue 0
8 PM Thu 46 44 NW 12 3268 5200 0 Blue 0
9 PM Thu 45 43 NW 14 3268 5200 0 Blue 0
10 PM Thu 45 43 NW 15 3268 5200 0 Blue 0
11 PM Thu 44 42 N 17 3268 5200 0 Blue 0
12 Midnight Fri 44 42 N 17 3268 5200 0 Blue 0
1 AM Fri 42 40 NW 17 3268 5200 0 Blue 0
2 AM Fri 42 40 NW 17 3268 5200 0 Blue 0
3 AM Fri 42 40 NW 18 3268 5200 0 Blue 0
4 AM Fri 41 39 NW 18 3268 5200 0 Blue 0
5 AM Fri 40 38 NW 20 3268 5200 0 Blue 0
6 AM Fri 39 37 NW 20 3268 5200 0 Blue 0
7 AM Fri 39 37 NW 20 3268 5200 0 Blue 0
8 AM Fri 40 38 N 22 3268 5200 0 Blue 0
9 AM Fri 41 40 N 22 3268 5200 0 Blue 0
10 AM Fri 43 44 N 22 3268 5200 0 Blue 0
11 AM Fri 46 48 N 22 3268 5200 0 Blue 0
12 Noon Fri 48 51 N 22 3268 5200 0 Blue 0
1 PM Fri 51 54 N 22 3268 5200 0 Blue 0
2 PM Fri 53 56 NW 17 3268 5200 0 Blue 0
3 PM Fri 54 56 NW 17 3268 5200 0 Blue 0
4 PM Fri 54 54 NW 17 3268 5200 0 Blue 0
5 PM Fri 54 53 SW 15 3268 5200 0 Blue 0
6 PM Fri 52 50 SW 15 3268 5200 0 Blue 0
7 PM Fri 50 48 SW 15 3268 5200 0 Blue 0
8 PM Fri 49 47 NW 14 3268 5200 0 Blue 0
9 PM Fri 48 46 NW 14 3268 5200 0 Blue 0
10 PM Fri 47 45 NW 14 3268 5200 0 Blue 0
11 PM Fri 47 45 N 17 3268 5200 0 Blue 0
12 Midnight Sat 45 43 N 17 3268 5200 0 Blue 0
1 AM Sat 43 41 N 17 3268 5200 0 Blue 0
2 AM Sat 42 40 N 23 3268 5200 0 Blue 0
3 AM Sat 42 40 N 23 3268 5200 0 Blue 0
4 AM Sat 41 39 N 23 3268 5200 0 Blue 0
5 AM Sat 39 37 N 24 3268 5200 0 Blue 0
6 AM Sat 39 37 N 24 3268 5200 0 Blue 0
7 AM Sat 38 36 N 24 3268 5200 0 Blue 0
8 AM Sat 38 36 N 26 3268 5200 0 Blue 0
9 AM Sat 40 39 N 26 3268 5200 0 Blue 0
10 AM Sat 42 43 N 26 3268 5200 0 Blue 0
11 AM Sat 44 46 N 28 3268 5200 0 Blue 0
12 Noon Sat 47 50 N 28 3268 5200 0 Blue 0
1 PM Sat 49 53 N 28 3268 5200 0 Blue 0
2 PM Sat 51 54 N 24 3268 5200 0 Blue 0
3 PM Sat 52 54 N 24 3268 5200 0 Blue 0
4 PM Sat 52 52 N 24 3268 5200 0 Blue 0
5 PM Sat 52 51 N 21 3268 5200 0 Blue 0
6 PM Sat 51 49 N 21 3268 5200 0 Blue 0
7 PM Sat 49 47 N 21 3268 5200 0 Blue 0
8 PM Sat 48 46 N 17 3268 5200 0 Blue 0
9 PM Sat 48 46 N 17 3268 5200 0 Blue 0
10 PM Sat 47 45 N 17 3268 5200 0 Blue 0
11 PM Sat 47 45 N 23 3268 5200 0 Blue 0
12 Midnight Sun 45 43 N 23 3268 5200 0 Blue 0
1 AM Sun 44 42 N 23 3268 5200 0 Blue 0
2 AM Sun 43 41 N 24 3268 5200 0 Blue 0
3 AM Sun 43 41 N 24 3268 5200 0 Blue 0
4 AM Sun 42 40 N 24 3268 5200 0 Blue 0
5 AM Sun 41 39 N 21 3268 5200 0 Blue 0
6 AM Sun 40 38 N 21 3268 5200 0 Blue 0
7 AM Sun 40 38 N 21 3268 5200 0 Blue 0
8 AM Sun 41 39 N 21 3268 5200 0 Blue 0
9 AM Sun 42 41 N 21 3268 5200 0 Blue 0
10 AM Sun 45 46 N 21 3268 5200 0 Blue 0
11 AM Sun 48 51 N 21 3268 5200 0 Blue 0
12 Noon Sun 50 54 N 21 3268 5200 0 Blue 0
1 PM Sun 53 57 N 21 3268 5200 0 Blue 0
2 PM Sun 56 59 N 17 3837 5200 0 Blue 0
3 PM Sun 56 58 N 17 3268 5200 0 Blue 0
4 PM Sun 57 57 N 17 3268 5200 0 Blue 0
5 PM Sun 57 56 N 14 3268 5200 0 Blue 0
6 PM Sun 56 54 N 14 3268 5200 0 Blue 0
7 PM Sun 54 52 N 14 3268 5200 0 Blue 0
8 PM Sun 53 51 NE 8 3268 5200 0 Blue 0
9 PM Sun 52 50 NE 8 3268 5200 0 Blue 0
10 PM Sun 51 49 NE 8 3268 5200 0 Blue 0
11 PM Sun 51 49 N 10 3268 5200 0 Blue 0
12 Midnight Mon 50 48 N 10 3268 5200 0 Blue 0
1 AM Mon 48 46 N 10 3268 5200 0 Blue 0
2 AM Mon 48 46 N 13 3268 5200 0 Blue 0
3 AM Mon 47 45 N 13 3268 5200 0 Blue 0
4 AM Mon 46 44 N 13 3268 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