SWOMCD
SPC MCD 150233
MNZ000-WIZ000-150330-
MESOSCALE DISCUSSION 1780
NWS STORM PREDICTION CENTER NORMAN OK
0933 PM CDT MON JUL 14 2008
AREAS AFFECTED...NERN MN
CONCERNING...SEVERE THUNDERSTORM WATCH 691...
VALID 150233Z - 150330Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 691
CONTINUES.
UPPER SPEED MAX APPEARS TO BE ENHANCING LARGE SCALE ASCENT ACROSS
EXTREME NRN MN THIS EVENING...PER RECENT EXPANSION OF THUNDERSTORMS.
THESE STORMS APPEAR TO BE DERIVING MUCH OF THEIR BUOYANCY FROM
UPSTREAM FEED OF VERY STEEP LAPSE RATE AIR THAT IS SPREADING SEWD
ACROSS ERN ND INTO NRN MN. GIVEN THE SHEAR IN PLACE IT/S NOT
SURPRISING THAT SUPERCELLS HAVE EVOLVED...HOWEVER COOLING BOUNDARY
LAYER SHOULD RESULT IN DECOUPLING UPDRAFTS...ESPECIALLY GIVEN THE
MID 50S SFC DEW POINTS IN PLACE. RESULTANT CLOUD BASES SHOULD THEN
BE PREDOMINANTLY ELEVATED IN NATURE...THOUGH LIKELY REMAIN SEVERE
GIVEN STEEP LAPSE RATES. LARGE HAIL SHOULD BE THE GREATEST THREAT
AS THESE STORMS SPREAD TOWARD THE UPPER PORTIONS OF LAKE SUPERIOR.
..DARROW.. 07/15/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DLH...MPX...FGF...
48539556 48709433 48459262 48049147 47978938 46589047
46549091 46169094 46159227 46429229 46439304 46179303
46179436 46379513 46119510 46119627 47159618 47169554
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