Fast moving QLCS
Posted by JAC on 4/4/2011, 2:45 pm



MESOSCALE DISCUSSION 0346
  NWS STORM PREDICTION CENTER NORMAN OK
  0125 PM CDT MON APR 04 2011
 
  AREAS AFFECTED...CNTRL/ERN KY
 
  CONCERNING...TORNADO WATCH 92...
 
  VALID 041825Z - 041930Z
 
  THE SEVERE WEATHER THREAT FOR TORNADO WATCH 92 CONTINUES.
 
  AREAS N/E OF WW 92 ARE BEING MONITORED FOR AN ADDITIONAL WW.
 
  LEADING EDGE OF HIGH REFLECTIVITY ASSOCIATED WITH A FAST-MOVING QLCS
  WAS ROUGHLY BOUNDED FROM SPENCER TO SIMPSON COUNTIES IN KY AS OF
  1815Z. EXTRAPOLATION OF 50-60 KT FORWARD PROPAGATION SPEED SUGGESTS
  THIS QLCS WILL APPROACH THE NRN/ERN EXTENT OF WW 92 BETWEEN 20-21Z.
  ALTHOUGH SURFACE TEMPERATURES HAVE WARMED INTO THE LOWER TO MIDDLE
  70S DOWNSTREAM OF THIS LINE...THE AXIS OF RICHER LOW-LEVEL MOISTURE
  /CHARACTERIZED BY DEW POINTS AOA 60 F/ REMAINS FROM PORTIONS OF
  CNTRL/WRN KY SWWD. GIVEN THE FAST PROPAGATION OF THE QLCS
  INTERCEPTING THE RETURNING HIGHER-QUALITY BOUNDARY-LAYER
  MOISTURE...THERE IS SOME UNCERTAINTY OVER THE ROBUSTNESS OF THE
  SEVERE THREAT FARTHER TO THE N/E OF WW 92. NEVERTHELESS...50-60 KT
  SWLYS AT 1 KM AGL AMIDST STRONG DEEP-LAYER SHEAR /PER AREA VAD WIND
  PROFILES/ WILL REMAIN SUPPORTIVE OF BOWING SEGMENTS AND TRANSIENT
  LOW-LEVEL CIRCULATIONS PRODUCING PRIMARILY DAMAGING WINDS AND A FEW
  TORNADOES.
 
  ..GRAMS.. 04/04/2011


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MS & W TN Under the Gun Today - JAC, 4/4/2011, 5:54 am
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