980607 - VORTEX crews intercepted a supercell south of Melrose, NM and worked the storm as it moved northeast into Texas. Operations were finally halted because of darkness as the storm moved through Dimmitt. Visibility was generally poor with light fog and dust obscuring the view on the inflow side. We consistently saw SE/25-35 winds on the inflow, and W/30-50 winds in the RFD. Cloud base was very low and made visual observations difficult. However, while the storm was still southwest of Melrose, visibilities were much greater, cloud base was higher, and structure was impressive. Another great NULL case! Now, can we please have a non-null case?