SWOMCD
SPC MCD 230029
NEZ000-WYZ000-230230-
MESOSCALE DISCUSSION 0856
NWS STORM PREDICTION CENTER NORMAN OK
0729 PM CDT FRI MAY 22 2009
AREAS AFFECTED...SERN WY / NEB PNHDL INTO N-CNTRL NEB
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 230029Z - 230230Z
THE POTENTIAL FOR MARGINALLY SEVERE HAIL AND LOCALLY EXCESSIVE
RAINFALL WILL CONTINUE INTO TONIGHT ACROSS DISCUSSION AREA. A WW
WILL NOT BE REQUIRED.
SPORADIC TSTM ACTIVITY HAS PERSISTED THIS EVENING ALONG AND AHEAD OF
SWD-MOVING COLD FRONT FROM NIOBRARA COUNTY SWD INTO PLATTE...GOSHEN
AND LARAMIE COUNTIES IN E-CNTRL/SERN WY. ENVIRONMENT IS NOT
PARTICULARLY UNSTABLE...BUT CONTINUED SELY/ELY LOW-LEVEL FEED OF
LOWER/MID 50S BOUNDARY LAYER DEWPOINTS BENEATH ERN EXTENSION OF
EML/STEEP MIDLEVEL LAPSE RATE PLUME SHOULD BE SUFFICIENT TO MAINTAIN
BRIEFLY STRONG UPDRAFTS CAPABLE OF SOME HAIL. CURRENT CYS VWP AND
MEDICINE BOW WY PROFILER INDICATE WEAK WIND FIELDS THROUGH THE LOW
TO MID-TROPOSPHERE WITH STORM MOTIONS LARGELY GOVERNED BY
PROPAGATION ALONG PRE-EXISTING OUTFLOW BOUNDARIES.
STORMS MAY TEND TO INCREASE IN COVERAGE THROUGH 03-04Z EWD THROUGH
THE NEB PNHDL INTO N-CNTRL NEB AS STRENGTHENING LLJ ENHANCES
CONVERGENCE ALONG SWD-MOVING COLD FRONT. SOME HAIL WILL BE POSSIBLE
WITH THE STRONGER CORES...AS WILL LOCALLY HEAVY RAINFALL DUE TO
TRAINING AND/OR BACKBUILDING TSTM ACTIVITY.
..MEAD.. 05/23/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LBF...CYS...
LAT...LON 41770521 42500461 42850317 42930186 42670087 42060060
41610099 41190311 41140470 41770521
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