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The March 5-7 White Lion Obs/Nowcasting Thread


Ji

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Absolutely no wind now. Just light snow. Nice to add a little base before it rips here after 3am. About .5in on hard non-paved surfaces and grass now. Looks great to the eye. My sidewalk starting to glaze over so the next heavy/mod band will do the roads in. We deserve this. Finally!

It feels great to finally savor a good snow!

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Excellent Meso-Disco from SPC.  I am uploading the image and text for archival purposes.

 

 

 

post-1389-0-15773500-1362547823_thumb.gi

MESOSCALE DISCUSSION 0248   NWS STORM PREDICTION CENTER NORMAN OK   0952 PM CST TUE MAR 05 2013      AREAS AFFECTED...ERN WV...PORTIONS OF NRN/WRN VA...A LARGE PART OF   MD...WASHINGTON DC...PORTIONS OF FAR SRN PA      CONCERNING...HEAVY SNOW       VALID 060352Z - 060945Z      SUMMARY...SNOW WITH RATES OF 1-1.5 IN/HR WILL SPREAD NEWD ACROSS   PARTS OF THE MID ATLANTIC AND CNTRL APPALACHIANS OVERNIGHT.      DISCUSSION...AS THE LEADING EDGE OF A STRONG MID-LEVEL PV MAX   CONTINUES OVERTAKING A LOW-LEVEL BAROCLINIC ZONE OVER THE   CAROLINAS...A SFC LOW IS DEVELOPING ALONG THE ATTENDANT FRONT IN   CNTRL NC WHERE PRESSURE FALLS OF 3-4 MB PER 2 HOURS HAVE BEEN NOTED.   AS THE SFC LOW TRACKS NEWD/NWD DURING THE NEXT SEVERAL HOURS...A   STRENGTHENING 850-700-MB FRONTOGENETIC CIRCULATION WILL SUPPORT   INCREASING MESOSCALE ASCENT. IN TURN...PRECIPITATION WILL CONTINUE   TO OVERSPREAD THE AREA TONIGHT AMID AN ELEVATED WARM CONVEYOR BELT.      WHILE LOW-LEVEL THERMAL PROFILES ARE INITIALLY MARGINAL FOR SNOW   FROM THE DC AREA INTO NRN VA...THE COMBINED EFFECTS OF COOLING OWING   TO FORCED ASCENT AND WET-BULB/NOCTURNAL EFFECTS SHOULD AID IN   LOWERING WET-BULB ZERO HEIGHTS TOWARD THE SFC DURING THE NEXT FEW   HOURS. FURTHERMORE...ISALLOBARIC FORCING SHOULD ALLOW LOW-LEVEL FLOW   BACK AND BECOME MORE NLY...RESULTING IN COOLER AIR BEING DRAWN INTO   THE REGION. AS SUCH...SNOW WILL BECOME THE PREDOMINANT PRECIPITATION   TYPE ACROSS THE AREA BY 06Z...WITH SNOW RATES INCREASING TO 1-1.5   IN/HR THEREAFTER. LOCALLY HIGHER RATES MAY OCCUR IN UPSLOPE-FAVORED   AREAS AND RIDGETOPS OVER THE CNTRL APPALACHIANS. THESE RATES WILL   LIKELY SPREAD NEWD WITH TIME...ROUGHLY IN TANDEM WITH THE TRACK OF   THE LOW...REACHING THE DC AREA MORE LIKELY AFTER 08Z. THESE RATES   WILL LIKELY CONTINUE THROUGH DAWN.      ..COHEN.. 03/06/2013         ATTN...WFO...AKQ...CTP...LWX...RNK...PBZ...RLX...      LAT...LON   38907692 38177802 37528005 37918080 38848042 39757915               39767774 39437690 38907692    

 

Link:  http://www.spc.noaa.gov/products/md/md0248.html

 

 

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