SWOMCD
SPC MCD 210356
MNZ000-SDZ000-NDZ000-NEZ000-210600-
MESOSCALE DISCUSSION 0521
NWS STORM PREDICTION CENTER NORMAN OK
1056 PM CDT FRI APR 20 2007
AREAS AFFECTED...CENTRAL NEB
CONCERNING...SEVERE THUNDERSTORM WATCH 153...
VALID 210356Z - 210600Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 153
CONTINUES.
CLUSTER OF STORMS INCLUDING A TORNADIC SUPERCELL CONTINUES TO MOVE
NEWD OVER SERN CUSTER COUNTY. THIS CELL PRODUCED SEVERAL TORNADO
REPORTS FROM MOOREFIELD THRU GOTHENBURG NEB. LOOKS ACTIVITY
DEVELOPED ON NOSE OF 40-50 KT LOW LEVEL JET JUST OVER SELY SURFACE
WINDS OF 25-30 KT ENHANCING 0-1 KM SHEAR. AIR MASS CONTINUES TO BE
VERY UNSTABLE AS WELL AS MLCAPE VALUES ARE AROUND 2500 J/KG ACROSS
THIS AREA.
RUC PFC SOUNDINGS SUPPORT THIS WITH SFC-1 KM SHEAR OF 32 KT WITH
FAVORABLE HODOGRAPH TO SUPPORT STRONG UPDRAFTS AS WELL AS MID LEVEL
LAPSE RATES OF 8C/KM. RADAR CONTINUES TO SHOW THIS CELL RECYCLING
AGAIN AT THIS TIME AND WILL CONTINUE TO DO SO AS STRONG SFC-LOW
LEVEL FLOW CONTINUES. THE AIR MASS REMAINS UNSTABLE NEWD INTO NORTH
CENTRAL NEB WHERE LATEST RUC FCST SHOWS ACTIVITY CONTINUING THRU
06Z.
.MCCARTHY.. 04/21/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FGF...FSD...OAX...ABR...BIS...LBF...UNR...
46629831 46629679 46309660 46019660 45679674 45599682
45469670 45379651 45339648 45329695 45299703 45299723
45139719 45139744 44539750 44539781 44179783 44189835
43489830 43499869 43399869 43179809 42989809 42859815
42859823 42949845 42969855 42970209 43130208 43150211
43420211 43500215 43650215 43660206 43770199 44520200
44530182 44580167 44580157 44620147 44690135 44730114
44990110 44990148 45470147 45450092 45490094 45460035
45570043 45640039 45690028 45720026 45900044 45940044
45939985 46279987 46279902 46629901
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