Thursday, October 31, 2013

Halloween

Expecting relatively mild temps, perhaps some showers, tropical like conditions for the evening with increasing winds overnight.  NWS has wind watch for the eastern sections, but I'm concerned with our area as well.  All models have LLJ winds over 70kts at 5k feet with some winds over 50kts at 2500 ft as well.  These areas are more focused on the western portions than east.  Winds die down later on the first.

Nov 1 morning - clouds moving by very fast, breezy as winds are not making it to the surface yet.  Comments by Upton.


75 TO 85 KT LLJ AT 3000 FEET REACHES THE REGION AHEAD OF THE BAND
OF LOW TOPPED CONVECTION...AT LEAST PER THE 06Z RAP. BASED ON
WHAT`S HAPPENING OUT WEST...STABILITY IS FORTUNATELY PREVENTING
THE LLJ FROM REACHING THE SURFACE. BASED ON THE RAP
SOUNDINGS...THIS SHOULD BE THE CASE HERE TOO.

IT`S NOT UNTIL THE LOW TOPPED CONVECTION REACHES THE REGION THAT
MOMENTUM TRANSFERRED TO THE SURFACE IS OCCURRING. THERE IS STILL
A SIGNIFICANT LLJ THAT WINDS SHOULD APPROACH 50 KT. SINCE
CONFIDENCE FOR EXCEEDING 50 KT IS NOT HIGH ENOUGH...WILL KEEP US
AT WIND ADVISORY LEVELS. ALSO...GRID FORECAST IS NOT ACCOUNTING
FOR THE PEAK GUSTS.

WILL NEED TO WATCH THIS DEVELOPING SITUATION CLOSELY THE NEXT 6
HOURS. THERE IS POTENTIAL HERE FOR A SIGNIFICANT WIND EVENT. SPC
HAS BEEN ISSUING WATCHES FOR THIS OUT WEST AND SINCE THIS IS CONVECTIVE
     NWS WILL USE CONVECTIVE PRODUCTS (I.E. SVR) EVEN THOUGH THERE
IS NO THUNDER.

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