| Show summer and line squall types of thunderstorms ThunderstorM 3 thunderstorms are of two main types one Is the ron common smon local summer afternoon kind the alio other Is 19 called a line squall find extends across the front of a moving mass of air often for or miles says tile the boston herald it Is the movement of these air masses across the country which i aich brings us our change of temperature and weather some come froni from Ca canada some from the gulf of mexico some from the pacific they differ greatly pr cally some lonie are cold some are warns karin some contain little moisture mols turp others a great gleat deal at the boundaries or fronts of these air masses othere each mass with wilh a dissimilar mass occur regions of rapidly varying temperatures changing g bindi vindi find and bad weather sometimes laking the form of thunderstorms roth tapes of 0 thunderstorm tire are invariably characterized by rising air currents cui rents of grent great velocities particularly nt at higher altitudes down currents anre of much lower velocities and feela to exist principally it at lower levels lu its regions of great turbulence |
