High Resolution Figures (Except Tornado Photos and Non Essentials): An Analysis of the 22 May 2004 Furnas County, Nebraska Tornadic Supercell

Figure 1 – Locations of two tornadoes (T1 and T2) reported to SPC and third tornado witnessed by lead author (T3) associated with Furnas County storm


Figure 3 – Subjective analysis of 2200 UTC 22 May 2004 surface data. 0-3 km SREH, surface moisture (dew point) tongue and area of 11oC+ temperatures at 700 mb also shown,as explained in the text in Sections 2 and 3.


Figure 4 – Base reflectivity (2207 UTC) from KUEX at 0.5o and 1.5o degree tilts, illustrating BWER, as explained in text. T1 shows the eventual position of the first tornado near Beaver City, seen in Fig. 2. The KUEX radar was intersecting the storm at a range of 146 km and at heights of 2500 m (0.5o tilt) and 5020 m (1.5o degree tilt).


Figure 7 – (a) Base reflectivity and (b) storm relative velocity plots (2233 UTC) from KUEX at 0.5o tilt, at exact time of Beaver City tornado report (T1). The KUEX radar was intersecting the storm at a range of 115 km and at heights of 1800 m (0.5o tilt) and 3800 m (1.5o degree tilt).


Figure 8 – Visible Satellite image at 2233 UTC, the exact time of the F1 Beaver City, Nebraska tornado. The Furnas County storm is southern most storm, just north of Kansas border. (Image courtesy Greg Thompson, UCAR)


Figure 9 – NCEP Reanalyses of key 700 mb features 0000 UTC, 23 May 2004. (a) 700 mb heights (m) and temperatures (C); (b) 700 mb heights (m) and vertical velocity (µbar s-1); (c) 1000-500 mb thickness (m) and 700 mb absolute vorticity (s-1).


Figure 10 – NCEP reanalysis of surface based CAPE (colors) and CINH (dashed) in J/kg at 0000 UTC 23 May 2004.

Figure 11 - 0000 UTC 23 May 2004 (a) KTOP environmental (red) and dew point (blue) lapse rates and (b) KOAX environmental lapse rate (ELR) (brown).  Inset is 0000 UTC KTOP hodograph.  Mandatory and significant level wind information for KTOP and KOAX plotted at right.


Figure 12 – Proximity Hodograph for the Furnas County storm obtained from the KUEX VAD wind profile at 2330 UTC, as explained in the text. Both actual storm motion (Table 1) and predicted storm motions (Bunkers technique) are shown.