MD 1168 CONCERNING SEVERE THUNDERSTORM WATCH 340… FOR PARTS OF WRN NEB AND SOUTH CENTRAL SD
MESOSCALE DISCUSSION 1168
NWS STORM PREDICTION CENTER NORMAN OK
1242 AM CDT SAT JUN 22 2013
AREAS AFFECTED...PARTS OF WRN NEB AND SOUTH CENTRAL SD
CONCERNING...SEVERE THUNDERSTORM WATCH 340...
VALID 220542Z - 220715Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 340
CONTINUES.
SUMMARY...STRONGER TSTMS ATTENDANT TO THE CENTRAL NEB/SERN SD MCS
HAVE MOVED EAST OF WW 340. THUS...THE NEB COUNTIES IN THIS WATCH
HAVE BEEN REMOVED AND SIMILARLY THE REST OF THIS WATCH COULD BE
CANCELED PRIOR TO THE SCHEDULED 06Z EXPIRATION.
ELEVATED TSTMS SHOULD PERSIST FOR A FEW HOURS OVER MAINLY WEST
CENTRAL NEB...WITH AN ISOLATED THREAT FOR HAIL AND/OR A STRONG WIND
GUST OR TWO.
DISCUSSION...AT 0530Z...REGIONAL RADAR IMAGERY SHOWED AN OUTFLOW
ATTENDANT TO THE CENTRAL NEB/SERN SD MCS EXTENDING FROM JUST W OF
KOFK TO 10 E OF KGRI TO ALONG THE NWRN KS/SWRN NEB BORDER. A 50 KT
SLY LLJ OVER WRN KS IS LIKELY AIDING IN WAA INTO AND N OF THE WRN
EXTENT OF THE OUTFLOW AND SUPPORTING THE ELEVATED TSTMS OVER WRN
CUSTER COUNTY TO CHEYENNE COUNTY NEB. MODERATE INSTABILITY AND
EFFECTIVE BULK SHEAR OF 40-50 KT WILL SUPPORT A FEW ORGANIZED
ELEVATED STORMS...WHILE STEEP MIDLEVEL LAPSE RATES CONTRIBUTE TO THE
HAIL THREAT. OVERALL SEVERE WEATHER THREAT COULD LAST FOR A FEW
HOURS AS VEERING OF THE LLJ WILL WEAKEN THE LOW LEVEL FORCING
OVERNIGHT INTO WEST CENTRAL NEB.
..PETERS.. 06/22/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LBF...UNR...CYS...
LAT...LON 41709942 41099940 41180147 41090283 41960172 42400109
43700110 43629968 42529972 41709942
via SPC Forecast Products http://www.spc.noaa.gov/products/md/md1168.html
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