Convection conditions forecast for balloning and gliding in Prague area

(the spot model elevation 1142 ft msl)

Term Ballooning Gliding Base and top of
convective clouds		 Type of
conv.
clouds		 Height of
cloudless
convection
above
2000 ft msl		 T Tc Tp Atmospheric
instability
indicators
YYGG Favorable conditions (yes/no/?) Base Top Fi SI850
UTC Surface
wind		 Convection Surface
wind		 Convection htf htf Cu/Cb/* hft deg.C deg.C deg.C – –
 
0803 ? yes yes no 54 78 6.0 16.0 -10.0 -7 7
 
0804 ? yes yes no 55 stab 6.4 16.6 -10.2 -6 6
 
0805 ? yes yes no 59 stab 6.7 18.1 -11.4 -6 5
 
0806 ? yes yes no 54 58 7.1 17.0 -9.9 -9 5
 
0807 no yes yes no 52 71 7.5 16.5 -9.0 -15 5
 
0808 no yes ? no 46 stab 8.1 15.4 -7.3 -13 6
 
0809 no yes yes no 41 72 9.1 15.0 -5.9 -14 6
 
0810 no yes yes no 40 71 10.3 15.1 -4.8 -13 5
 
0811 no yes yes no 40 79 11.2 15.4 -4.2 -12 5
 
0812 no yes yes no 35 42 21 11.7 15.0 -3.3 -11 4
 
0813 no yes yes no 35 87 11.9 15.3 -3.4 -8 4
 
0814 ? yes yes no 33 46 11.6 14.9 -3.3 -5 3
 
0815 ? yes yes no 39 44 11.0 16.5 -5.5 -4 2
 
0816 no yes yes no 40 50 10.8 16.6 -5.8 -4 2
 
0817 ? yes yes no 41 66 10.4 16.7 -6.3 -3 1
 
0818 no yes yes no 50 136 10.0 18.8 -8.8 -3 0
 
0819 no yes yes no 38 stab 9.9 15.7 -5.8 -4 1
 
 
0903 ? yes yes no 21 28 10.2 11.5 -1.3 -2 -1
 
0904 ? yes yes no 22 stab 10.1 11.6 -1.5 -3 -1
 
0905 ? yes yes no 60 196 9.9 20.8 -10.9 -4 0
 
0906 ? yes yes no 59 181 9.7 20.5 -10.8 -3 -1
 
0907 ? yes yes no 61 158 9.2 20.8 -11.6 -5 -0
 
0908 ? yes yes no 24 stab 9.5 11.6 -2.1 -7 1
 
0909 no yes yes no 22 stab * 10.4 11.1 -0.7 -9 1
 
0910 no yes yes no 53 stab 22 11.0 19.1 -8.1 -10 3
 
0911 no ? yes no 23 stab * 11.5 11.6 -0.1 -10 4
 
0912 ? ? yes no 54 91 24 11.7 19.2 -7.5 -10 3
 
0913 ? ? yes no 54 83 24 11.7 19.3 -7.6 -9 3
 
0914 ? yes yes no 55 stab 22 11.4 19.8 -8.4 -9 3
 
0915 ? yes yes no 58 stab 10.4 20.4 -10.0 -9 3
 
0916 ? yes yes no 64 stab 9.4 21.6 -12.2 -11 2
 
0917 ? yes yes no 67 stab 8.7 21.8 -13.1 -11 2
 
 
T
surface temperature - 2 m AGL
Tc
the convective temperature
Tp
the thermal deficit (the difference between the surface temperature and the convective temperature (T-Tc))
The cloud's base and top
are determined relative to MSL
*
unpossible to determine the cloud's type
-
the cloud's base height is under the ground level
Cloudless convection
the height represents the top level. This determines the upper height of instable atmospheric layer, provided the conditions for development of convective clouds (Cu/Cb) are not satisfied.
Fi
Faust index (a (in)stability parameter) [-]
SI850
Showalter Index (an/a (in)stability parameter) [-]

Page by swing a.s Last Updated: 08.Dec 2025 in 00:23