Skip Navigation Links www.nws.noaa.gov 
NOAA logo-Select to go to the NOAA homepage
NOAA's National Weather Service
  Select to go to the NWS homepage
Storm Prediction Center
 
   

Search SPC
 

Mesoscale Discussion 178
< Previous MD          Next MD >
MD 178 graphic
   
   MESOSCALE DISCUSSION 0178
   NWS STORM PREDICTION CENTER NORMAN OK
   1240 PM CST SUN FEB 20 2005
   
   AREAS AFFECTED...CNTRL/SRN LOWER MI INTO EXTREME NW OH
   
   CONCERNING...PRECIPITATION TRENDS...WINTER PRECIPITATION 
   
   VALID 201840Z - 202245Z
   
   SNOW EXPECTED TO INCREASE ACROSS PORTIONS OF CNTRL/SRN LOWER MI THIS
   AFTERNOON...ESPECIALLY ALONG/NORTH OF INTERSTATE 69/96
   CORRIDORS...WHERE SNOW RATES MAY REACH 1-1.5 IN/HR BETWEEN 21Z-03Z.
   SLEET/FZRA EXPECTED TO BECOME MORE LIKELY THIS AFTERNOON ACROSS SRN
   LOWER MI INVOF I-94.
   
   WARM CONVEYOR/MOISTURE TRANSPORT REGIME CONTINUES TO OVERSPREAD
   LOWER MI AHEAD OF SHORTWAVE TROUGH EVIDENT IN WATER VAPOR IMAGERY
   OVER IA. LIGHT/MDT SNOW ALREADY OCCURRING ACROSS CNTRL/SRN LOWER
   MI...AND INTENSITY EXPECTED TO INCREASE THIS AFTERNOON OWING TO
   INFLUENCE OF UPPER JET DIV/MID LEVEL FRONTOGENETICAL FORCING.
   
   IN ADDITION TO INCREASING SYNOPTIC SCALE UVVS...STEEP MID LEVEL
   LAPSE RATES OBSERVED IN 12Z DVN/ILX RAOBS WILL CONTINUE TO ADVECT
   DOWNSTREAM TOWARD LOWER MI. INCREASING POTENTIAL INSTABILITY THIS
   AFTERNOON -- FURTHER CONFIRMED BY RECENT CG LIGHTNING OVER NRN IN/SW
   LOWER MI -- COINCIDENT WITH STRONG 600 MB-750 MB FRONTOGENESIS
   SUGGESTS MARKED POTENTIAL FOR W/NW-E/SE BANDING AND ENHANCED SNOW
   RATES ON THE MESOSCALE.
   
   ACROSS SRN LOWER MI INVOF I-94/SRN IRISH HILLS...FZRA AND/OR SLEET
   EXPECTED TO BECOME INCREASINGLY LIKELY AFTER 21Z. 12Z NAM/15Z RUC
   SOUNDINGS AND PRECIP TYPE ALGORITHMS SUGGEST FZRA/SLEET CORRIDOR
   WILL MATERIALIZE AS ENCROACHING 850-700 MB WARM LAYER OVERSPREADS
   SHALLOW SUB-FREEZING LAYER.
   
   ..GUYER.. 02/20/2005
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A 
   SCHEDULED BASIS...FOUR TIMES A DAY...BETWEEN 00-01 UTC...
   06-07 UTC...12-13 UTC...AND 18-19 UTC AS SIGNIFICANT SHORT
   RANGE WINTER WEATHER EVENTS UNFOLD.  THIS SCHEDULE WILL BE
   USED FROM DECEMBER 1 THROUGH FEBRUARY 28.
   
   ATTN...WFO...CLE...DTX...APX...IWX...GRR...
   
   43968499 43938376 43808276 43078244 42078276 41728298
   41568337 41598393 41858508 42278584 42478604 42998610
   43638599 43838556 
   
Top/All Mesoscale Discussions/Forecast Products/Home