Soaring Guidance
Issued by NWS Boise, ID
Issued by NWS Boise, ID
151
UXUS97 KBOI 181305
SRGBOI
Soaring Forecast
National Weather Service Boise, Idaho
705 AM MDT Friday, September 18, 2026
This forecast is for Friday, September 18, 2026:
If the trigger temperature of 75.0 F/23.9 C is reached...then
Thermal Soaring Index....................... Fair
Maximum rate of lift........................ 296 ft/min (1.5 m/s)
Maximum height of thermals.................. 5742 ft MSL (2775 ft AGL)
Forecast maximum temperature................... 73.0 F/23.2 C
Time of trigger temperature.................... None
Time of overdevelopment........................ 1100 MDT
Middle/high clouds during soaring window....... None
Surface winds during soaring window............ 20 mph or less
Height of the -3 thermal index................. 4564 ft MSL (1597 ft AGL)
Thermal soaring outlook for Saturday 09/19..... Fair
Wave Soaring Index............................. Not available
Remarks...
Sunrise/Sunset.................... 07:28:04 / 19:49:44 MDT
Total possible sunshine........... 12 hr 21 min 40 sec (741 min 40 sec)
Altitude of sun at 13:38:54 MDT... 47.19 degrees
Upper air data from rawinsonde observation taken on 09/18/2026 at 0600 MDT
Freezing level.................. 11963 ft MSL (8996 ft AGL)
Convective condensation level... 12391 ft MSL (9424 ft AGL)
Lifted condensation level....... 10752 ft MSL (7785 ft AGL)
Lifted index.................... -1.3
K index......................... +30.4
Height Temperature Wind Wind Spd Lapse Rate ConvectionT Thermal Lift Rate
ft MSL deg C deg F Dir kt m/s C/km F/kft deg C deg F Index fpm m/s
--------------------------------------------------------------------------------
40000 -46.9 -52.4 210 35 18 2.3 1.3 M M M M M
38000 -46.1 -51.0 200 47 24 1.2 0.7 M M M M M
36000 -45.4 -49.7 195 59 31 1.2 0.7 M M M M M
34000 -44.4 -47.9 195 66 34 1.9 1.0 M M M M M
32000 -43.3 -45.9 190 66 34 1.9 1.0 M M M M M
30000 -40.9 -41.6 185 64 33 7.4 4.0 42.0 107.6 14.2 M M
28000 -36.5 -33.7 185 59 30 7.3 4.0 40.1 104.2 13.1 M M
26000 -32.7 -26.9 185 50 26 5.6 3.1 37.3 99.1 11.2 M M
24000 -28.7 -19.7 190 38 20 8.0 4.4 34.2 93.6 9.0 M M
22000 -24.0 -11.2 195 30 15 8.0 4.4 32.9 91.1 8.1 M M
20000 -18.9 -2.0 195 27 14 8.8 4.8 32.0 89.6 7.5 M M
18000 -14.0 6.8 195 26 13 7.9 4.3 31.1 87.9 6.7 M M
16000 -9.3 15.3 190 21 11 8.3 4.5 29.8 85.7 5.7 M M
14000 -4.6 23.7 185 14 7 7.1 3.9 28.7 83.6 4.6 M M
12000 -0.3 31.5 225 7 3 8.4 4.6 27.1 80.7 3.2 M M
10000 4.8 40.6 245 4 2 8.8 4.8 26.3 79.3 2.6 M M
9000 7.4 45.3 290 2 1 8.4 4.6 26.0 78.7 2.3 M M
8000 10.6 51.1 335 6 3 9.5 5.2 25.5 77.9 1.8 M M
7500 11.6 52.9 335 7 4 5.7 3.1 25.1 77.1 1.3 M M
7000 12.7 54.9 335 9 4 7.5 4.1 24.7 76.5 1.0 M M
6500 13.8 56.8 330 11 6 7.0 3.8 24.3 75.8 0.7 M M
6000 14.9 58.8 330 11 6 6.2 3.4 24.0 75.2 0.3 M M
5500 15.4 59.7 325 12 6 3.4 1.8 23.1 73.5 -0.7 79 0.4
5000 15.8 60.4 320 12 6 0.7 0.4 22.1 71.7 -1.7 52 0.3
4750 15.6 60.1 320 13 7 -1.1 -0.6 21.3 70.3 -2.6 49 0.2
4500 15.6 60.1 320 13 6 0.5 0.3 20.5 68.9 -3.4 43 0.2
4250 15.6 60.1 320 11 6 -1.1 -0.6 19.8 67.6 -4.1 36 0.2
4000 15.3 59.5 315 12 6 -4.6 -2.5 18.8 65.9 -5.1 36 0.2
3750 15.1 59.2 315 12 6 0.9 0.5 17.8 64.1 -6.1 36 0.2
3500 15.3 59.5 310 9 5 1.6 0.9 17.4 63.3 -6.6 22 0.1
3400 15.3 59.5 310 9 5 1.6 0.9 17.4 63.3 -6.6 22 0.1
3300 14.9 58.8 310 7 4 -13.5 -7.4 16.5 61.7 -7.5 27 0.1
3200 14.9 58.8 310 7 4 -13.5 -7.4 16.5 61.7 -7.5 27 0.1
3100 14.9 58.8 310 7 4 -13.5 -7.4 16.5 61.7 -7.5 27 0.1
3000 14.2 57.6 315 5 3 8.0 4.4 15.4 59.8 -8.6 40 0.2
2900 M M M M M M M M M M M M
* * * * * * Numerical weather prediction model forecast data valid * * * * * *
09/18/2026 at 0900 MDT | 09/18/2026 at 1200 MDT
|
CAPE... 0.0 LI... -0.2 | CAPE... +204.0 LI... -0.2
CINH... -0.2 K Index... +28.9 | CINH... -41.6 K Index... +27.0
|
Height Temperature Wnd WndSpd Lapse Rate | Temperature Wnd WndSpd Lapse Rate
ft MSL deg C deg F Dir kt m/s C/km F/kft | deg C deg F Dir kt m/s C/km F/kft
--------------------------------------------------------------------------------
40000 -46.1 -51.0 215 25 13 2.7 1.5 | -45.3 -49.5 240 12 6 3.1 1.7
38000 -45.3 -49.5 205 31 16 1.2 0.7 | -44.3 -47.7 225 13 7 1.4 0.8
36000 -44.6 -48.3 195 39 20 1.2 0.7 | -43.5 -46.3 210 15 8 1.4 0.8
34000 -44.0 -47.2 190 46 24 0.7 0.4 | -43.2 -45.8 195 20 10 -0.9 -0.5
32000 -43.5 -46.3 185 52 27 0.7 0.4 | -43.7 -46.7 180 28 15 -0.9 -0.5
30000 -41.7 -43.1 180 52 27 6.9 3.8 | -42.5 -44.5 175 32 17 7.1 3.9
28000 -37.6 -35.7 175 45 23 6.9 3.8 | -38.3 -36.9 170 27 14 7.0 3.9
26000 -33.2 -27.8 170 39 20 7.4 4.1 | -32.7 -26.9 165 22 11 8.9 4.9
24000 -28.1 -18.6 170 31 16 8.4 4.6 | -27.5 -17.5 160 20 10 8.1 4.4
22000 -23.2 -9.8 175 23 12 8.4 4.6 | -22.6 -8.7 155 19 10 8.2 4.5
20000 -18.5 -1.3 175 19 10 7.8 4.3 | -18.1 -0.6 145 19 10 7.5 4.1
18000 -13.9 7.0 170 16 8 7.5 4.1 | -13.8 7.2 140 19 10 7.2 4.0
16000 -9.7 14.5 150 11 6 7.5 4.1 | -9.6 14.7 125 16 8 6.8 3.8
14000 -5.5 22.1 105 6 3 6.4 3.5 | -5.9 21.4 085 10 5 5.6 3.1
12000 -1.4 29.5 020 3 2 7.2 3.9 | -2.4 27.7 015 10 5 6.9 3.8
10000 2.7 36.9 315 6 3 7.9 4.3 | 1.7 35.1 345 12 6 6.7 3.7
9000 5.1 41.2 310 8 4 9.0 4.9 | 4.4 39.9 330 12 6 8.1 4.5
8000 8.4 47.1 305 11 5 10.5 5.8 | 7.1 44.8 320 13 7 11.0 6.0
7500 9.5 49.1 310 11 6 5.4 3.0 | 8.1 46.6 315 12 6 5.2 2.8
7000 10.7 51.3 305 12 6 7.6 4.2 | 9.4 48.9 310 12 6 8.4 4.6
6500 11.5 52.7 300 13 7 5.6 3.1 | 10.7 51.3 310 13 7 8.2 4.5
6000 12.5 54.5 300 13 7 4.9 2.7 | 11.8 53.2 310 12 6 8.6 4.7
5500 12.8 55.0 300 13 7 3.0 1.6 | 13.0 55.4 315 11 6 5.1 2.8
5000 13.2 55.8 305 12 6 1.0 0.5 | 13.4 56.1 315 10 5 4.5 2.5
4750 13.2 55.8 305 12 6 0.0 0.0 | 13.7 56.7 320 8 4 3.3 1.8
4500 13.2 55.8 305 11 6 0.9 0.5 | 13.8 56.8 315 7 3 0.6 0.3
4250 13.2 55.8 305 10 5 0.3 0.2 | 13.8 56.8 300 6 3 4.3 2.3
4000 13.2 55.8 305 8 4 -1.1 -0.6 | 14.3 57.7 305 5 3 8.4 4.6
3750 13.2 55.8 305 7 4 1.6 0.9 | 14.9 58.8 315 5 2 5.9 3.2
3500 13.4 56.1 295 6 3 4.7 2.6 | 15.3 59.5 290 4 2 7.3 4.0
3400 13.4 56.1 295 6 3 4.7 2.6 | 15.3 59.5 290 4 2 7.3 4.0
3300 13.7 56.7 305 4 2 2.4 1.3 | 16.0 60.8 295 4 2 13.4 7.4
3200 13.7 56.7 305 4 2 2.4 1.3 | 16.0 60.8 295 4 2 13.4 7.4
3100 13.7 56.7 305 4 2 2.4 1.3 | 16.0 60.8 295 4 2 13.4 7.4
3000 13.9 57.0 330 3 2 8.4 4.6 | 16.7 62.1 305 4 2 2.1 1.2
2900 M M M M M M M | M M M M M M M
09/18/2026 at 1500 MDT | 09/18/2026 at 1800 MDT
|
CAPE... +255.7 LI... -1.0 | CAPE... +243.4 LI... -0.2
CINH... -42.7 K Index... +28.0 | CINH... -32.4 K Index... +30.2
|
Height Temperature Wnd WndSpd Lapse Rate | Temperature Wnd WndSpd Lapse Rate
ft MSL deg C deg F Dir kt m/s C/km F/kft | deg C deg F Dir kt m/s C/km F/kft
--------------------------------------------------------------------------------
40000 -44.8 -48.6 285 16 8 3.4 1.9 | -43.8 -46.8 310 32 17 4.2 2.3
38000 -43.8 -46.8 280 10 5 1.5 0.8 | -42.2 -44.0 310 27 14 2.5 1.4
36000 -42.9 -45.2 265 4 2 1.5 0.8 | -40.7 -41.3 305 22 11 2.5 1.4
34000 -42.5 -44.5 145 4 2 -0.6 -0.3 | -40.5 -40.9 325 12 6 -2.3 -1.2
32000 -42.8 -45.0 125 11 6 -0.6 -0.3 | -41.8 -43.2 055 13 7 -2.2 -1.2
30000 -41.6 -42.9 125 15 8 6.6 3.6 | -41.0 -41.8 075 21 11 7.0 3.9
28000 -37.7 -35.9 125 14 7 6.5 3.6 | -36.8 -34.2 070 16 8 7.0 3.8
26000 -32.3 -26.1 135 13 7 8.6 4.7 | -31.6 -24.9 065 10 5 8.1 4.5
24000 -27.2 -17.0 150 13 7 7.9 4.4 | -26.8 -16.2 055 6 3 7.8 4.3
22000 -22.5 -8.5 155 14 7 8.0 4.4 | -22.2 -8.0 055 2 1 7.8 4.3
20000 -18.0 -0.4 160 15 7 7.5 4.1 | -17.7 0.1 355 2 1 7.4 4.0
18000 -13.7 7.3 165 14 7 7.4 4.1 | -13.3 8.1 335 3 2 7.8 4.3
16000 -9.5 14.9 170 10 5 7.2 3.9 | -9.3 15.3 345 6 3 6.3 3.4
14000 -5.5 22.1 235 1 0 5.7 3.1 | -5.7 21.7 005 8 4 6.5 3.5
12000 -1.7 28.9 340 8 4 6.8 3.7 | -2.0 28.4 005 12 6 5.8 3.2
10000 2.3 36.1 345 11 6 7.4 4.1 | 1.5 34.7 350 15 8 7.6 4.2
9000 5.1 41.2 340 13 6 7.8 4.3 | 4.4 39.9 340 15 8 7.9 4.3
8000 7.7 45.9 335 13 7 10.8 5.9 | 6.9 44.4 335 14 7 9.4 5.2
7500 8.6 47.5 325 12 6 3.4 1.9 | 7.9 46.2 335 14 7 5.9 3.2
7000 9.7 49.5 320 11 6 7.2 4.0 | 9.1 48.4 335 12 6 7.8 4.3
6500 10.8 51.4 320 12 6 7.2 4.0 | 10.1 50.2 335 11 6 7.3 4.0
6000 11.7 53.1 310 10 5 6.8 3.7 | 11.3 52.3 345 10 5 7.6 4.2
5500 12.7 54.9 310 10 5 6.5 3.6 | 12.3 54.1 350 8 4 6.9 3.8
5000 13.5 56.3 300 7 4 6.0 3.3 | 13.3 55.9 005 7 4 7.2 3.9
4750 13.9 57.0 300 8 4 7.0 3.9 | 13.8 56.8 020 6 3 7.0 3.9
4500 14.5 58.1 295 7 4 9.3 5.1 | 14.3 57.7 030 5 3 6.1 3.4
4250 15.2 59.4 285 6 3 9.0 4.9 | 14.7 58.5 035 5 3 7.8 4.3
4000 15.7 60.3 285 6 3 7.5 4.1 | 15.4 59.7 050 5 2 9.2 5.0
3750 16.3 61.3 285 6 3 10.1 5.5 | 16.0 60.8 065 5 2 9.3 5.1
3500 17.2 63.0 275 5 2 11.4 6.2 | 16.7 62.1 050 4 2 8.7 4.8
3400 17.2 63.0 275 5 2 11.4 6.2 | 16.7 62.1 050 4 2 8.7 4.8
3300 17.8 64.0 275 5 2 6.8 3.7 | 17.2 63.0 060 4 2 5.8 3.2
3200 17.8 64.0 275 5 2 6.8 3.7 | 17.2 63.0 060 4 2 5.8 3.2
3100 17.8 64.0 275 5 2 6.8 3.7 | 17.2 63.0 060 4 2 5.8 3.2
3000 18.4 65.1 280 5 2 16.2 8.9 | 17.7 63.9 070 4 2 11.0 6.1
2900 M M M M M M M | M M M M M M M
________________________________________________________________________________
This product is issued twice per day, once by approximately 0630 MST/0730 MDT
(1330 UTC) and again by approximately 1830 MST/1930 MDT (0130 UTC). It is not
continuously monitored nor updated after its initial issuance.
The information contained herein is based on rawinsonde observation and/or
numerical weather prediction model data taken at the Boise Airport site in
Boise, Idaho at
Latitude: 43.56774
Longitude: -116.21089
Elevation: 2867 feet (874 meters)
and may not be representative of other areas in eastern Oregon or southwest
Idaho. Note that some elevations in numerical weather prediction models differ
from actual station elevations, which can lead to data which appear to be below
ground. Erroneous data such as these should not be used.
The content and format of this report as well as the issuance times are subject
to change without prior notice.
082025