Figure 4. 12-h forecast surface analysis from the 2 February 1998 1200 UTC Nested Grid Model valid at 0000 UTC 3 February 1998. Surface pressure (solid; hPa) and thickness (dashed; dm) are displayed. Reno is located in the warm sector of this extratropical cyclone with warm advection occurring. The critical thickness for snow in Reno is typically 542 decameters.