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MESOSCALE DISCUSSION 1101
NWS STORM PREDICTION CENTER NORMAN OK
0742 PM CDT SAT JUN 13 2009
AREAS AFFECTED...NERN CO...CNTRL/SERN WY...WRN NEB PANHANDLE
CONCERNING...TORNADO WATCH 397...
VALID 140042Z - 140145Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 397 CONTINUES.
CURRENT CONVECTIVE TRENDS SUGGEST GREATEST SEVERE THREAT HAS EVOLVED
INTO AN ARCING PATTERN FROM ALONG THE SERN WY/NEB PANHANDLE BORDER
BACK TOWARDS THE NRN DENVER METRO AREA. ENVIRONMENT INVOF THE
ONGOING CONVECTION AND DOWNSTREAM REMAINS FAVORABLE FOR ROTATING
STORMS PRODUCING SEVERE HAIL AND LOCALIZED DOWNBURSTS WITH EFFECTIVE
SHEAR AROUND 50 KT /PER AREA PROFILERS AND RAOBS/. MODIFIED 00Z
DNR/LBF RAOBS SUGGEST MINIMAL LOW-LEVEL CAPE MAY REMAIN DETRIMENTAL
TO A MORE ROBUST TORNADO THREAT. NEVERTHELESS...AN AXIS OF HIGHER
LOW-LEVEL THETA-E /COMPRISED OF SURFACE DEW POINTS FROM THE MIDDLE
TO UPPER 50S/ AND SUBSTANTIAL VEERING OF THE LOW-LEVEL FLOW SHOULD
ENHANCE POTENTIAL FOR AN ISOLATED TORNADO OR TWO ALONG THE I-76
CORRIDOR OF THE NERN CO PLAINS.
..GRAMS.. 06/14/2009
ATTN...WFO...LBF...UNR...GLD...PUB...BOU...CYS...RIW...
LAT...LON 39470548 40300477 40610438 41360432 42080469 42430640
42470773 42860811 43410794 43530656 43520476 43250366
42700307 41910255 40890214 40240208 39640243 38770322
38570407 38620490 39290530 39470548
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