Different algorithms are designed to isolate the turbulence from radar measured Doppler velocity. Spatial spectra along the quasi-horizontal direction are then obtained in stratiform rain, storms and squall lines. The slope of horizontal spectra in stratiform rain and storms is close to -5/3 on a log-log graph up to at least scales of 10 km and 7 km respectively. The spectrum in a squall line has a steeper slope than -5/3 up to scales at least 17 km. The scales at low wave number end on the spectra are so large that the spectra could not be due to three-dimensional isotropic turbulence but to two-dimensional turbulence.