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Early Season Lake Effect and Clippers


Geos

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Liking the ILN AFD. I know it won't amount to much but it would still be nice to see all snow for a little bit.

 

 

 

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
428 PM EDT TUE OCT 22 2013

.SYNOPSIS...
A LOW PRESSURE SYSTEM WILL CROSS THE OHIO VALLEY
TONIGHT...BRINGING RAIN TO THE REGION...MIXING WITH SNOW IN SOME
LOCATIONS DURING THE EARLY MORNING HOURS. MUCH COLDER AIR WILL
MOVE IN ON WEDNESDAY...WITH BELOW NORMAL TEMPERATURES AND
OCCASIONAL LIGHT RAIN OR SNOW SHOWERS EXPECTED THROUGH THE START
OF THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
A COMPLICATED FORECAST SCENARIO HAS SET UP FOR TONIGHT...WITH
SEVERAL CHALLENGES INVOLVING TIMING...TEMPERATURE...AND
PRECIPITATION TYPE. THE OVERALL SCENARIO IS IN GOOD AGREEMENT (AS
IT SHOULD BE WITHIN A DAY)...BUT UNFORTUNATELY THERE ARE A FEW KEY
DIFFERENCES IN THE DETAILS.

SURFACE ANALYSIS SHOWS A COMPACT AREA OF LOW PRESSURE MOVING
EAST...ENTERING THE STATE OF ILLINOIS NNW OF ST LOUIS. THE SURFACE
LOW IS RIDING JUST AHEAD OF THE AXIS OF A WELL-DEFINED
SHORTWAVE...WHICH IS ALSO MOVING EAST TOWARD THE OHIO VALLEY. THE
SURFACE LOW IS FORECAST TO TRACK ESE...PASSING VERY CLOSE TO
CINCINNATI...MOVING INTO KENTUCKY AND WEST VIRGINIA. THE LOW WILL
EVENTUALLY BE ABSORBED INTO A BROADER AREA OF LOW PRESSURE ON THE
EAST COAST.

THE FIRST KEY TO THE FORECAST IS TIMING. AS A GENERAL RULE FOR THE
MODEL RUNS TODAY...THE HIGHER-RESOLUTION THE MODEL...THE SLOWER
THE PROGRESSION OF THE WEATHER SYSTEM. THE GFS AND ECMWF ARE ON
THE FAST SIDE OF THE SOLUTIONS...ENDING THE MAJORITY OF
PRECIPITATION IN THE ILN CWA BY 12Z. THE ARW/NMM RUNS AND NAM12
ARE SLOWER...WITH THE BULK OF THE PRECIPITATION STILL IMPACTING
THE AREA AT DAYBREAK. IN REALITY...THE CURRENT POSITION OF THE
SURFACE LOW INDICATES A SCENARIO SOMEWHERE BETWEEN THE TWO
EXTREMES.

JUST NORTH OF THE TRACK OF THE LOW...AN AXIS OF 850MB CONVERGENCE
WILL COMBINE WITH LIFT FROM THE SHORTWAVE TO GENERATE AN AREA OF
STEADY PRECIPITATION. THE GENERAL TRACK OF THE BEST FORCING IS IN
GOOD AGREEMENT...SANS THE WRF-ARW (A LITTLE FURTHER SOUTH) AND THE
RAP (A LITTLE FURTHER NORTH). QPF AMOUNTS OF A FEW TENTHS OF AN
INCH LOOK POSSIBLE ALONG THIS AXIS...STRETCHING FROM CENTRAL
INDIANA THROUGH SOUTHEASTERN OHIO. CATEGORICAL POPS WERE REQUIRED
THROUGH THIS AREA...WITH ONLY THE SLIGHT TIMING CONCERNS
PREVENTING 100-POPS AND EVEN GREATER DETAIL FROM BEING USED.

BETWEEN THE DIURNAL CYCLE AND THE EXTRA PUSH OF COLD AIR BEHIND
THE SURFACE LOW...TEMPERATURES ARE EXPECTED TO FALL INTO THE
LOWER-TO-MID 30S (NORTHWEST CWA) TO AROUND 40 (SOUTHERN CWA)
TONIGHT. IT HAS BECOME EVIDENT THAT THESE TEMPERATURES WILL BE
COLD ENOUGH TO SUPPORT SNOW MIXING IN WITH RAIN...WITH (FOR
CERTAIN LOCATIONS) SNOW LIKELY EVEN BECOMING THE DOMINANT
PRECIPITATION TYPE FOR A COUPLE HOURS NEAR DAYBREAK. THE CRUX OF
THIS FORECAST IS THE TIMING AND PLACEMENT OF THESE
TEMPERATURES...JUXTAPOSED WITH THE AXIS OF HEAVIEST PRECIPITATION.
MUCH OF THE NORTHERN TWO-THIRDS OF THE CWA ARE LIKELY TO
EXPERIENCE A BIT OF WET SNOW MIXING WITH RAIN. HOWEVER...THERE
WILL BE A WINDOW FOR A COUPLE HOURS IN WHICH AN AXIS FROM RICHMOND
IN TO XENIA OH APPEARS TO BE COLD ENOUGH TO SUPPORT SNOW AS THE
PRIMARY PRECIPITATION TYPE...WHILE MODERATE PRECIPITATION
INTENSITY IS STILL OCCURRING. THIS IS WHERE SOME OF THE SUBTLE
DIFFERENCES IN TEMPERATURE FORECASTS CAN HAVE A BIG IMPACT. THE
HIGHER-RESOLUTION MODELS ALLOW FOR AN AREA OF DYNAMIC COOLING
OCCURRING WITH THE PRECIPITATION...A LEGITIMATE POSSIBILITY (ONE
UNTOUCHED BY THE COARSER MODELS) THAT WOULD INCREASE CHANCES FOR
SNOW. GROUND TEMPS ARE QUITE WARM (MID TO UPPER 40S) AND IT IS
VERY UNLIKELY THAT ANY IMPACTS WILL BE FELT ON PAVEMENT.
HOWEVER...WET ACCUMULATIONS ON GRASS OR RAISED SURFACES WILL BE
POSSIBLE IN THIS CORRIDOR...AND THE FORECAST GRIDS WILL ALLOW FOR
SEVERAL TENTHS OF AN INCH IN THE AFOREMENTIONED LOCATIONS.

 

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Fun day.  Unfortunately I was stuck at work all day, but got to watch it all unfold.  Snow started around 8, and then began to mix with rain.  Around 10 the mix changed back over to all snow and became moderate.  Big fat flakes fell for quite awhile, and that helped to establish a slushy base.  Snow quickly began to accumulate and stuck to everything.  Guessing about 2" piled up where I was on the northeast side of the QC.  For a time the snow was even sticking to pavement.  Heaviest snow was done by around 1, with only light snow and even light rain again the rest of the afternoon. 

 

Here's a few pics from home a bit ago.  There's been some melting, so I'm not sure how much we got.  Had the time lapse running all day, so will check that a little later.

l9mu.jpg

r81w.jpg
 

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nice pics cyclone

maybe jonger was on to something

my zone'cast:

TONIGHT...WIDESPREAD SNOW SHOWERS AND RAIN SHOWERS. TOTAL

NIGHTTIME SNOW ACCUMULATION UP TO 1 INCH. LOWS IN THE LOWER 30S.

NORTHWEST WINDS 10 MPH. GUSTS UP TO 20 MPH IN THE EVENING.

.WEDNESDAY...WIDESPREAD RAIN SHOWERS...POSSIBLY MIXED WITH SNOW

SHOWERS. TOTAL DAYTIME SNOW ACCUMULATION AROUND 1 INCH. HIGHS IN

THE LOWER 40S. NORTHWEST WINDS 5 TO 15 MPH WITH GUSTS TO AROUND

25 MPH.

.WEDNESDAY NIGHT...FREQUENT SNOW SHOWERS...POSSIBLY MIXED WITH

RAIN SHOWERS. TOTAL NIGHTTIME SNOW ACCUMULATION UP TO 4 INCHES.

LOWS IN THE MID 30S. NORTHWEST WINDS 5 TO 15 MPH.

.THURSDAY...FREQUENT RAIN SHOWERS...POSSIBLY MIXED WITH SNOW

SHOWERS. HIGHS IN THE LOWER 40S. NORTHWEST WINDS 5 TO 15 MPH WITH

GUSTS TO AROUND 25 MPH.

.THURSDAY NIGHT...FREQUENT SNOW SHOWERS. LOWS IN THE MID 30S. NORTHWEST WINDS 5 TO 15 MPH

WITH GUSTS TO AROUND 25 MPH

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Great pics Cyclone!

 

Dry air battle took place here. I did venture into Mc Henry County quite a ways to see if I could pick up some flurries, but by the time I got to Woodstock the precipitation shield shrunk. Just low clouds and upper 30s out that way.

 

Glad the system and thread didn't end up being a dud. I knew it was a bit risky given it was October.

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Time lapse of the whole event here.  The tree in the middle really starts to sag as the snow accumulates.  It then springs back up later in the vid as the snow melts.  It surprised me how quickly the snow melted off the trees once the snow quit.  The leaves must still be radiating out some warmth.

 

EDIT:  Removed the vid.  Replaced it with the better one in the post below...

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PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE INDIANAPOLIS IN

408 AM EDT WED OCT 23 2013

.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON

.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.

..REMARKS..

0358 AM SNOW MUNCIE 40.20N 85.39W

10/23/2013 E1.0 INCH DELAWARE IN PUBLIC

1 INCH OF SNOW IN MUNCIE VIA PUBLIC ON NATIONAL WEATHER SERVICE NORTHERN INDIANA FACEBOOK PAGE.

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE INDIANAPOLIS IN

317 AM EDT WED OCT 23 2013

.TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON

.DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.

..REMARKS..

0317 AM SNOW 3 S ALEXANDRIA 40.21N 85.68W

10/23/2013 M1.5 INCH MADISON IN PUBLIC

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Let's see whos right in the end for western DTX ares versus eastern GRR.

 

Ingham county is 10 miles to my west, this is their forecast versus mine. If you looked at DTX you wouldn't think there was a shot at early season snow.

 

99% likely DTX fails on this forecast for my city.

 

attachicon.gifHow-Lansing.jpg

 

 

GRR right.... DTX wrong.

 

Its snowing pretty moderately here at my house.

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Just saw some of that snow footage from Moline. Congrats on the early season white stuff. Although my experience has been that October snow is usually not a sign of positive things to come.

I used to think the same thing, but then I actually looked at the data (for Detroit) and its really a crapshoot. Measurable snow is rare, as a trace of snow is very common. Of the 133 years on record (not counting 2013 as it isnt complete), only 65 had zero snow, which is slightly less than half. However...just 15 of the 133 Octobers saw measurable snow. That means that the past 133 Octobers have shown us that Detroit has a 51% chance of seeing a few flakes, but only an 11% chance of seeing measurable snow. Of the 15 Octobers that saw measurable snow, 10 of the winters ended up being snowier than normal and 5 saw below normal snow.

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