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December 5-6, 2013 Winter Storm


mimillman

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Something about the GFS solution is odd. It keeps the H5 longwave trough basically stationary but has the sfc frontal boundary progressively move to the SE. My initial thinking is that the GFS (and other models) may be too far south with this threat attm.

Hey SSC, ready for your blizzard in Edmonton tonight and tommorow?

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Winds/visibilities aren't going to be strong/low enough for a true blizzard and amounts are nothing extraordinary (4-8"). I'll enjoy it though. I am not going to enjoy the extreme cold midweek though.

Calgary loks like a better chance at seeing blizzard conditions. That's the big downfall of living in Edmonton during the winter is those FRIGID temps. Will definitely be a shock to the system for you.

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The differences at 144 between the EURO and the GEM/GFS are huge. While the latter models still have the trough centered over the northern Plains, EURO has ejected it into northern Quebec/Labrador. EURO is bad news for the northern part of the subforum in the short-run but it's already trying to carve out the next trough along the west coast. Might be a D9-10 monster.

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The differences at 144 between the EURO and the GEM/GFS are huge. While the latter models still have the trough centered over the northern Plains, EURO has ejected it into northern Quebec/Labrador. EURO is bad news for the northern part of the subforum in the short-run but it's already trying to carve out the next trough along the west coast. Might be a D9-10 monster.

The EURO has been very consistent in showing that D9-10 storm. Verbatim it's a front end dump followed by rain. Meh

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Where do you guys get these snowfall maps?

 

There weatherbell's. I'm being safe and cropping out where it's from. Not so concerned with the GEM, but the EURO I make sure I crop out what I only want. ... or I draw them out myself!

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NWS ILN going with 25% 12z Euro and 75% 12z GFS.

 

 

 

.LONG TERM /WEDNESDAY THROUGH SUNDAY/...
UPPER LEVEL PATTERN WILL TRANSITION TO A HIGHLY AMPLIFIED REGIME
THROUGH THE EXTENDED PERIOD. THERE CONTINUES TO BE ISSUES WITH
TIMING AND RUN TO RUN CONTINUITY WITH MAJOR SYNOPTIC SYSTEMS TO
AFFECT OUR REGION. LOOKING AT THE VARIOUS OPERATIONAL MODELS...HAVE
DECIDED TO GO WITH A 25 PERCENT 12Z ECMWF AND A 75 PERCENT 12Z GFS.
WE ARE GETTING TO THE POINT IN THE FORECAST WHERE DIURNAL RISE AND
FALL WILL NOT CUT IT WITH FRONTS MOVING THROUGH AND WAVES OF LOW
PRESSURE RIDING ALONG THE FRONTAL BOUNDARY.

ON WEDNESDAY...LONG WAVE TROUGH WILL BE CARVING ITSELF OUT OVER THE
WESTERN U.S. FIRST WEATHER ISSUE IS THE AMOUNT OF ENERGY THAT WILL
EJECT FROM THIS FEATURE ACROSS THE NORTHERN PLAINS AND INTO CENTRAL
CANADA. GFS IS STRONGER AND FASTER WITH THIS ENERGY WHILE THE ECMWF
IS SLOWER...AND THIS HAS BEEN THE CASE OVER THE LAST SVRL RUNS. THIS
WILL HAVE FRONTAL IMPLICATIONS THROUGH OUR REGION WEDNESDAY INTO
THURSDAY. WITH AFOREMENTIONED BLEND...IT ALLOWS FOR A COLD FRONT TO
MOVE THROUGH THE REGION WEDNESDAY NIGHT...BUT NOT AS FAST AS THE GFS
INDICATES. IN ADVANCE OF THE FRONT...WAA SHOWERS ARE FORECAST TO
BREAK OUT AND LIKELY POPS SEEM REASONABLE AT THIS TIME.

FOR THE PERIOD THURSDAY INTO FRIDAY...THIS TIME FRAME IS SHAPING UP
TO BE INCLEMENT AS COLD FRONT SAGS TO OUR SOUTHEAST AND BECOMES
QUASI STATIONARY AS WAVES OF LOW PRESSURE RIDE ALONG IT. THESE WAVES
WILL BRING A SHOT OF FRONTOGENETIC FORCING TO OUR REGION LATE
THURSDAY INTO THURSDAY NIGHT WITH ANOTHER ROUND OF MID TO UPR LVL
FORCING FRIDAY INTO FRIDAY NIGHT. DURING THIS TIME...COLD AIR WILL
SLOWLY SEEP INTO THE REGION FROM THE NORTHWEST. AS SUCH...THERE WILL
BE SOME WINTRY PCPN TYPE ISSUES AS LOW LEVELS COOL BUT AIR ABOVE
WILL BE SLOWER TO COOL. STILL TO EARLY TO GET SPECIFIC GIVEN THE
THERMAL FIELD OSCILLATIONS AT THIS POINT SO JUST HAVE RAIN/SNOW
MENTIONED. LIKELY POPS STILL SEEM REASONABLE FOR MOST OF THE REGION
WITH EACH WAVE RIPPLING BY.

BY FRIDAY NIGHT INTO SATURDAY...COLD ARCTIC HIGH PRESSURE WILL WEDGE
SOUTHEAST INTO OUR AREA. THIS SHOULD PUSH THE PCPN OUT OF THE AREA
BY SATURDAY. THE HIGH WILL SET UP ACROSS THE REGION SATURDAY NIGHT
AND WILL MOVE EAST BY SUNDAY. THIS SHOULD GIVE THE REGION A DRY BUT
COLD PERIOD OF WEATHER.
 

 

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GGEM loading on the snow in central WI. Interesting development. I-70 corridor still in line for snow.

 

cmc_snow_acc_east_24.png

 

No more interesting than the NAM failing at the 84 hour range.  The WRF NMM, to counter this, has rain all the way up into far N Wisconsin on Wednesday as the low moves east, and is all rain in the southern half of Wisconsin with WAA precip tomorrow.

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