A sounding was included if it was within 250 km and taken within three hours of the first reported severe convective wind gust. Winds are uni-directionally WSW in initiation region. Proximity soundings were used to construct the hodographs. A sounding was included if it was within 250 km and taken within three hours of the first reported severe convective wind gust. For Southward Burst DMCSs, there were no proximity soundings available to sample the initiation environment.
Black line indicates the derecho track.
Conceptual diagram of the orientation of an 850 hPa theta-E ridge to the track of southeastward moving northern tier derechos. A. Vertical Theta-E Gradient and Wind Evolution Figure 3. Derecho track and location for vertical cross-section illustrated with solid arrow. Derecho track and location for vertical cross-section illustrated with solid arrow. Derecho track and location for vertical cross-section illustrated with solid arrow.