Detailed Predictions for: Big Sur
Launch Altitude (f): 3200
LZ Altitude (f): 60
Sounding

Station:

KOAK

Date/Time:

21 NOV 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)
4 AM Thu 48 38 S 1 2392 3200 0 Blue 0
5 AM Thu 49 39 S 1 2392 3200 0 Blue 0
6 AM Thu 49 39 S 1 2392 3200 0 Blue 0
7 AM Thu 49 39 SW 2 2392 3200 0 Blue 0
8 AM Thu 52 42 SW 2 2392 3200 0 Blue 0
9 AM Thu 53 43 SW 2 2392 3200 0 Blue 0
10 AM Thu 53 44 S 5 2392 3200 0 Blue 0
11 AM Thu 53 44 S 5 2392 3200 0 Blue 0
12 Noon Thu 53 44 S 5 2392 3200 0 Blue 0
1 PM Thu 53 44 SW 7 2392 3200 0 Blue 0
2 PM Thu 53 43 SW 7 2392 3200 0 Blue 0
3 PM Thu 54 44 SW 7 2392 3200 0 Blue 0
4 PM Thu 54 44 S 2 2392 3200 0 Blue 0
5 PM Thu 51 41 S 2 2392 3200 0 Blue 0
6 PM Thu 50 40 S 2 2392 3200 0 Blue 0
7 PM Thu 50 40 SE 2 2392 3200 0 Blue 0
8 PM Thu 50 40 SE 2 2392 3200 0 Blue 0
9 PM Thu 50 40 SE 2 2392 3200 0 Blue 0
10 PM Thu 50 40 SE 3 2392 3200 0 Blue 0
11 PM Thu 50 40 SE 3 2392 3200 0 Blue 0
12 Midnight Fri 49 39 SE 3 2392 3200 0 Blue 0
1 AM Fri 49 39 SE 3 2392 3200 0 Blue 0
2 AM Fri 50 40 SE 3 2392 3200 0 Blue 0
3 AM Fri 50 40 SE 3 2392 3200 0 Blue 0
4 AM Fri 50 40 SE 5 2392 3200 0 Blue 0
5 AM Fri 50 40 SE 5 2392 3200 0 Blue 0
6 AM Fri 50 40 SE 5 2392 3200 0 Blue 0
7 AM Fri 51 41 SE 5 2392 3200 0 Blue 0
8 AM Fri 53 43 SE 5 2392 3200 0 Blue 0
9 AM Fri 55 46 SE 5 2392 3200 0 Blue 0
10 AM Fri 55 46 S 2 2392 3200 0 Blue 0
11 AM Fri 55 47 S 2 2392 3200 0 Blue 0
12 Noon Fri 55 47 S 2 2392 3200 0 Blue 0
1 PM Fri 55 47 S 2 2392 3200 0 Blue 0
2 PM Fri 55 46 S 2 2392 3200 0 Blue 0
3 PM Fri 55 46 S 2 2392 3200 0 Blue 0
4 PM Fri 55 45 NE 2 2392 3200 0 Blue 0
5 PM Fri 54 44 NE 2 2392 3200 0 Blue 0
6 PM Fri 54 44 NE 2 2392 3200 0 Blue 0
7 PM Fri 54 44 NE 9 2392 3200 0 Blue 0
8 PM Fri 54 44 NE 9 2392 3200 0 Blue 0
9 PM Fri 54 44 NE 9 2392 3200 0 Blue 0
10 PM Fri 54 44 E 13 2392 3200 0 Blue 0
11 PM Fri 54 44 E 13 2392 3200 0 Blue 0
12 Midnight Sat 54 44 E 13 2392 3200 0 Blue 0
1 AM Sat 53 43 E 12 2392 3200 0 Blue 0
2 AM Sat 55 45 E 12 2392 3200 0 Blue 0
3 AM Sat 55 45 E 12 2392 3200 0 Blue 0
4 AM Sat 55 45 E 12 2392 3200 0 Blue 0
5 AM Sat 55 45 E 12 2392 3200 0 Blue 0
6 AM Sat 54 44 E 12 2392 3200 0 Blue 0
7 AM Sat 55 45 E 9 2392 3200 0 Blue 0
8 AM Sat 58 48 E 9 2392 3200 0 Blue 0
9 AM Sat 60 51 E 9 3246 3200 0 Blue 2
10 AM Sat 60 52 NE 3 3428 3200 0 Blue 3
11 AM Sat 60 52 NE 3 3428 3200 0 Blue 3
12 Noon Sat 60 53 NE 3 3610 3200 0 Blue 4
1 PM Sat 60 52 NE 2 3428 3200 0 Blue 3
2 PM Sat 60 52 NE 2 3428 3200 0 Blue 3
3 PM Sat 61 52 NE 2 3428 3200 0 Blue 3
4 PM Sat 60 50 NE 6 3063 3200 0 Blue 1
5 PM Sat 56 46 NE 6 2392 3200 0 Blue 0
6 PM Sat 56 46 NE 6 2392 3200 0 Blue 0
7 PM Sat 56 46 NE 8 2392 3200 0 Blue 0
8 PM Sat 56 46 NE 8 2392 3200 0 Blue 0
9 PM Sat 55 45 NE 8 2392 3200 0 Blue 0
10 PM Sat 55 45 NE 5 2392 3200 0 Blue 0
11 PM Sat 54 44 NE 5 2392 3200 0 Blue 0
12 Midnight Sun 54 44 NE 5 2392 3200 0 Blue 0
1 AM Sun 53 43 N 3 2392 3200 0 Blue 0
2 AM Sun 55 45 N 3 2392 3200 0 Blue 0
3 AM Sun 55 45 N 3 2392 3200 0 Blue 0
4 AM Sun 55 45 N 3 2392 3200 0 Blue 0
5 AM Sun 55 45 N 3 2392 3200 0 Blue 0
6 AM Sun 54 44 N 3 2392 3200 0 Blue 0
7 AM Sun 55 45 NE 6 2392 3200 0 Blue 0
8 AM Sun 58 48 NE 6 2392 3200 0 Blue 0
9 AM Sun 61 52 NE 6 3428 3200 0 Blue 3
10 AM Sun 60 52 NE 5 3428 3200 0 Blue 3
11 AM Sun 60 52 NE 5 3428 3200 0 Blue 3
12 Noon Sun 60 53 NE 5 3610 3200 0 Blue 4
1 PM Sun 61 52 NW 6 3428 3200 0 Blue 3
2 PM Sun 60 51 NW 6 3246 3200 0 Blue 2
3 PM Sun 61 51 NW 6 3246 3200 0 Blue 2
4 PM Sun 61 51 NW 7 3246 3200 0 Blue 2
5 PM Sun 57 47 NW 7 2392 3200 0 Blue 0
6 PM Sun 56 46 NW 7 2392 3200 0 Blue 0
7 PM Sun 56 46 N 6 2392 3200 0 Blue 0
8 PM Sun 56 46 N 6 2392 3200 0 Blue 0
9 PM Sun 55 45 N 6 2392 3200 0 Blue 0
10 PM Sun 56 46 N 7 2392 3200 0 Blue 0
11 PM Sun 54 44 N 7 2392 3200 0 Blue 0
12 Midnight Mon 54 44 N 7 2392 3200 0 Blue 0
1 AM Mon 54 44 N 7 2392 3200 0 Blue 0
2 AM Mon 55 45 N 7 2392 3200 0 Blue 0
3 AM Mon 55 45 N 7 2392 3200 0 Blue 0
4 AM Mon 55 45 N 8 2392 3200 0 Blue 0
5 AM Mon 55 45 N 8 2392 3200 0 Blue 0
6 AM Mon 55 45 N 8 2392 3200 0 Blue 0
7 AM Mon 55 45 N 9 2392 3200 0 Blue 0
8 AM Mon 58 48 N 9 2392 3200 0 Blue 0
9 AM Mon 60 51 N 9 3246 3200 0 Blue 2
10 AM Mon 60 51 N 12 3246 3200 0 Blue 2
11 AM Mon 60 51 N 12 3246 3200 0 Blue 2
12 Noon Mon 60 51 N 12 3246 3200 0 Blue 2
1 PM Mon 60 51 NW 14 3246 3200 0 Blue 2
2 PM Mon 60 51 NW 14 3246 3200 0 Blue 2
3 PM Mon 60 50 NW 14 3063 3200 0 Blue 1
4 PM Mon 60 50 NW 15 3063 3200 0 Blue 1
5 PM Mon 55 45 NW 15 2392 3200 0 Blue 0
6 PM Mon 54 44 NW 15 2392 3200 0 Blue 0
7 PM Mon 54 44 NW 16 2392 3200 0 Blue 0
8 PM Mon 53 43 NW 16 2392 3200 0 Blue 0
9 PM Mon 53 43 NW 16 2392 3200 0 Blue 0
10 PM Mon 53 43 N 14 2392 3200 0 Blue 0
11 PM Mon 52 42 N 14 2392 3200 0 Blue 0
12 Midnight Tue 51 41 N 14 2392 3200 0 Blue 0
1 AM Tue 50 40 N 12 2392 3200 0 Blue 0
2 AM Tue 51 41 N 12 2392 3200 0 Blue 0
3 AM Tue 51 41 N 12 2392 3200 0 Blue 0
4 AM Tue 51 41 N 12 2392 3200 0 Blue 0
5 AM Tue 51 41 N 12 2392 3200 0 Blue 0
6 AM Tue 51 41 N 12 2392 3200 0 Blue 0
7 AM Tue 52 42 N 10 2392 3200 0 Blue 0
8 AM Tue 53 43 N 10 2392 3200 0 Blue 0
9 AM Tue 55 45 N 10 2392 3200 0 Blue 0
10 AM Tue 55 46 N 9 2392 3200 0 Blue 0
11 AM Tue 55 47 N 9 2392 3200 0 Blue 0
12 Noon Tue 55 47 N 9 2392 3200 0 Blue 0
1 PM Tue 55 47 W 10 2392 3200 0 Blue 0
2 PM Tue 54 45 W 10 2392 3200 0 Blue 0
3 PM Tue 55 45 W 10 2392 3200 0 Blue 0
4 PM Tue 55 45 NW 10 2392 3200 0 Blue 0
5 PM Tue 51 41 NW 10 2392 3200 0 Blue 0
6 PM Tue 51 41 NW 10 2392 3200 0 Blue 0
7 PM Tue 51 41 NW 10 2392 3200 0 Blue 0
8 PM Tue 51 41 NW 10 2392 3200 0 Blue 0
9 PM Tue 50 40 NW 10 2392 3200 0 Blue 0
10 PM Tue 50 40 N 14 2392 3200 0 Blue 0
11 PM Tue 49 39 N 14 2392 3200 0 Blue 0
12 Midnight Wed 49 39 N 14 2392 3200 0 Blue 0
1 AM Wed 48 38 N 17 2392 3200 0 Blue 0
2 AM Wed 49 39 N 17 2392 3200 0 Blue 0
3 AM Wed 49 39 N 17 2392 3200 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

Supported By: Alan Crouse [email protected]