Feb 16, 2021
- Problems getting data from National Weather Service began on Feb 11 impacting operation of the Soaring Predictor software.
The service seems to be working again at about 75% as of this morning, Feb 16.

Backup data is being sourced from however, their free service is limited to 3 days. If you see a three day forecast for your favorite site, thank the WeatherAPI folks. The full 5-day forecasts are receiving input data from the National Weather service (thank them too :-).

Hourly wind gust has been added to the detail page.

RASP and Windgrams should not be impacted

See the southern California RASP Model The detail grid covers the San Diego sites, but the 4km grid covers most of southern California.

Instructional video on reading the RASP Model

Check out the WINDGRAMS



KNKX (alt)


17 APR 2021

Temp/Wind data from:

NOAA Digital Forecast
Sat Sun Mon Tue Wed Thu
Wind Above
Wind Above
Wind Above
Wind Above
Wind Above
Wind Above
Torrey Pines Gliderport W 9 0 NW 14 2602 W 8 2585
Blossom Valley W 11 7474 NNE 17 8713 W 19 9928
Horse Canyon W 6 10456 N 21 10230 WNW 19 13136
Little Black W 10 2347 WNW 10 5438 W 11 4916
Marshall N 12 10357 NNE 20 10357 WSW 12 11750
Crestline N 12 17643 NNE 20 17643 WSW 12 19624
Mentone N 10 2119 NNE 18 2119 W 9 6920
Kagel NE 4 12215 NE 19 13875 WSW 10 14848
Lake Elsinore W 13 11928 N 16 12370 W 15 14424
Laguna WNW 5 10004 NNE 21 10004 WNW 16 17662
Big Black W 11 10129 NE 13 11534 W 16 12318
Otay Mesa W 10 4433 NW 15 9427 W 13 9831
Soboba WSW 9 7273 NNE 12 7702 SW 15 8939
Henninger Flats SW 4 6396 NE 16 7869 SW 9 8681
Palomar W 11 1708 N 8 5703 W 14 6578
Thomas Mt NE 7 11512 NNE 19 11512 WNW 11 13344
Winchester WSW 9 6162 NNE 12 7538 SW 15 8792
Blackhawk N 14 8222 NNE 20 8222 NNW 8 12443
Ord NE 14 10307 NNE 23 10307 NNW 7 14581
Warner Springs WNW 7 3870 NNE 22 2864 WSW 12 6588

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  If a front comes through, the sounding is no longer valid.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 or website.  Puddle temperatures can exceed this temperature. 

Puddle Temp: This estimate is based on the High Temp and the National Weather Service or 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 or website.

Wind Gust: This estimate is taken from the National Weather Service or 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