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JAN. 6-9 LES Set up


Indystorm

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Love how those dendrites sparkle like a million diamonds :). All in all, quite pleased with today, but considering tomorrow afternoon/night is the "main show", still a little nervous about LES here, but so far, Im cautiously optimistic!

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2537-800.jpg

I love how you can make little amounts of snow look so large Josh, really wintry looking down by you, up this way we are under an inch for the day.

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I love how you can make little amounts of snow look so large Josh, really wintry looking down by you, up this way we are under an inch for the day.

lol. I notice on busy roads there seems to be more grass pickers than in residential areas. The 2nd pic there was an old snow pile left from December, and I thought it looked cool the way the dendrites sat/sparkled on it. Snowed most of the day today, starting at 1am, and Im thinking we close the day at 1.6" snowfall, though snow depth is closer just slightly above 1 inch, thanks to the fluffiness of the snow allowing settling.

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Interesting, only 2.4" on my snowboard in 24hours. Took numerous measurements of current snow depth around the yard, and got about 3.6" some areas had 4" I don't remember that much on the ground when I started last night, only a light dusting that just barely covered the ground. I think I need a snow fence.

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Interesting, only 2.4" on my snowboard in 24hours. Took numerous measurements of current snow depth around the yard, and got about 3.6" some areas had 4" I don't remember that much on the ground when I started last night, only a light dusting that just barely covered the ground. I think I need a snow fence.

Another guy ( who posts at my other forum ) who lives off sw Capital reported 3" which seems about right.

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Interesting, only 2.4" on my snowboard in 24hours. Took numerous measurements of current snow depth around the yard, and got about 3.6" some areas had 4" I don't remember that much on the ground when I started last night, only a light dusting that just barely covered the ground. I think I need a snow fence.

As long as your not pushing it into the grass, 3.6" could probably be right. Snow boards arent always perfect lol. Plus remember, fluffy snow settles, so if you only took 1 measurment after 24-hours of snowfall, the actual snowfall will be a little higher than what the depth is.

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Love how those dendrites sparkle like a million diamonds :). All in all, quite pleased with today, but considering tomorrow afternoon/night is the "main show", still a little nervous about LES here, but so far, Im cautiously optimistic!

2536-800.jpg

2537-800.jpg

SO FLUFFY :thumbsup::snowman:

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SO FLUFFY :thumbsup::snowman:

I love this kind of snow. ESPECIALLY when there is old snowcover. It would have been PERFECT to have our 5-6" dense snowpack from December with this as a topping, rather than starting from "scratch". Not complaining mind you, just lamenting a little at that damn New Years torch in what appears to be shaping up as quite a cold winter!

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Appreciate it. I was interested to see this as well as I know how rare it is for Detroit to get lake effect. Thanks for posting

No problem. To simply get lake effect flurries or light snow showers, or even the occasional heavy le squall...is really not uncommon at all for Detroit. See it dozens of times every winter. However, to see lake effect of the magnitude the NAM and RGEM is showing, well thats something you dont even necessarily see once every winter. Thats why Im excited but very cautious...

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Uh oh (at least for Detroit & Lansing). :unsure:

http://forecast.weather.gov/product.php?site=NWS&issuedby=GRR&product=AFD&format=CI&version=1&glossary=1

000

FXUS63 KGRR 070337

AFDGRR

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE GRAND RAPIDS MI

1037 PM EST THU JAN 6 2011

LATEST UPDATE...SHORT TERM...

ONLY MINOR CHANGES TO THE GOING FORECAST. NW FLOW CONTINUES TO HIT

THE SW CORNER OF THE STATE WITH OCCASIONAL HEAVY SNOW. A DOMINATE

BAND HAS BEEN NEARLY STATIONARY FROM JUST SOUTH OF BIV TO AZO.

AZO/S VSBY HAS BEEN AROUND ONE MILE MUCH OF THE EVENING. WITH THE

RADAR ESTIMATING AROUND AN INCH AN HOUR WITHIN THIS BAND.

OTHER AREAS ARE NOT DOING AS WELL WITH SEVERAL HOLES IN THE LAKE

EFFECT PATTERN...WHICH IS TYPICAL. WILL LEAVE HEADLINES AS IS AS

THE POTENTIAL OF HEAVY SNOW STILL EXISTS ESPECIALLY INTO FRIDAY AS

THE FLOW BECOMES MORE WESTERLY. HOWEVER...REGARDING THIS WIND

SHIFT...THE 00Z NAM BUFKIT HAS ARRIVED AND IT DOES NOT TURN THE FLOW

AS WESTERLY AS PREVIOUS RUNS. WILL NEED TO ANALYSIS THIS AND MAY

NEED TO ADJUST HEADLINES IN THE MORNING IF THIS STILL SEEMS TO BE

COMING INTO PLAY. IF THIS DOES OCCUR...THE SW CORNER OF THE STATE

WILL REMAIN THE SWEET SPOT AND TOTALS OF A FOOT OR TWO MAY BE RATHER

LIKELY BEFORE THINGS WIND DOWN ON SATURDAY.

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Very quiet night, maybe a few flurries, no new accumulation. For records purposes, Ill consider Jan 6th one event and Jan 7/8th one event. It was last Jan 7th that we had our first appreciable snowstorm (4.5") of the winter, after just an inch here, 2 inches there, etc.

So, event #1, Jan 6, 2011:

MBY: P- 0.08", S- 1.6"

DTW: P- 0.07", S- 1.4"

event #2, Jan 7/8, 2011: TBD

As Ive said all along, Im very cautiously optimistic. DTX sounds good...

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI

413 AM EST FRI JAN 7 2011

.SHORT TERM... TODAY

THE LULL IN SNOW SHOWER ACTIVITY WILL BE BRIEF OVER SE MICHIGAN

DURING THE MORNING. COLD AIR SPILLING INTO THE REGION ON NORTHWEST

LOW LEVEL WINDS WILL COMBINE WITH ANOTHER WAVE OF LOW PRESSURE ALOFT

TO INCREASE SNOW SHOWERS DURING THE DAYLIGHT HOURS OF THE MORNING

FOLLOWED BY A WELL-ORGANIZED LAKE ENHANCED SCENARIO THIS AFTERNOON.

THE HIGHEST CONCENTRATION OF ACTIVITY CONTINUES TO BE EXPECTED IN

THE INTERSTATE 94/96 CORRIDOR BUT WITH GENEROUS COVERAGE OF SNOW

SHOWERS AS FAR SOUTH AS THE OHIO BORDER THIS MORNING AND AS FAR

NORTH AS INTERSTATE 69 THIS AFTERNOON. THE SAGINAW VALLEY AND THUMB

WILL BE SUBJECT MOSTLY TO A DUSTING OF LIGHT SNOW BROUGHT THROUGH

THE REGION BY THE UPPER WAVE ITSELF. ACCUMULATION AROUND 2 INCHES

LOOKS LIKE THE MOST LIKELY NUMBER IN THE VICINITY OF THE LAKE

ENHANCEMENT BUT UPWARD ADJUSTMENTS WILL BE POSSIBLE DEPENDING ON

OBSERVATIONAL EVIDENCE OF BAND STRENGTH AND DURATION.

EARLY INDICATIONS THAT THE LAKE ENHANCEMENT WILL BE SUBSTANTIAL WITH

THIS SYSTEM ARE SUGGESTED BY RADAR IMAGERY UP TO PRESS TIME. POCKETS

OF 30 DBZ SNOW SHOWERS HAVE MANAGED TO WORK INLAND IN SW LOWER FROM

LAKE MICHIGAN DESPITE CONSIDERABLE LARGE SCALE SUBSIDENCE BETWEEN

UPPER WAVES. BACKING LOW LEVEL FLOW IS ALREADY UNDERWAY WHICH WILL

HELP MORE OF THE SNOW SHOWERS REACH OUR AREA DURING THE MORNING

HOURS. WHILE NOT BRINGING A WHOLE LOT OF SNOWFALL ON ITS OWN, THE

UPPER WAVE ROTATING SOUTHWARD FROM NORTHERN ONTARIO WILL PROVIDE A

VERY FAVORABLE ENVIRONMENT FOR THE CONTINUED GROWTH OF CONVERGENCE

BANDS OFF THE SOUTH END OF LAKE MICHIGAN. THE BACKGROUND FIELD OF

WEAK VERTICAL MOTION WILL HELP LIFT CONVECTIVE DEPTH FROM OVER THE

LAKE THROUGH MUCH OF LOWER MICHIGAN AND DEEPEN THE MOISTURE PROFILE

WITH RESPECT TO ICE CRYSTAL GROWTH. THE NAM IS MOST AGGRESSIVE IN

LIFTING THE EQUILIBRIUM LEVEL UP TO ABOUT 8 KFT AS FAR EAST AS METRO

DETROIT BY MID AFTERNOON FUELED BY MODERATE TO EXTREME OVER-LAKE

INSTABILITY AS SUGGESTED BY 850 MB TEMPS DROPPING TO ABOUT -17C.

THIS MODEL AT LEAST GIVES US AN IDEA OF THE UPPER END OF CONVECTIVE

POTENTIAL AND THE BEST CHANCE OF GETTING THE LOW LEVEL WIND FIELD

CORRECTLY DEPICTED. THAT BEING SAID, HOWEVER, IT IS IMPORTANT TO

NOTE THE LOW LEVEL GRADIENT FLOW IS WEAK THROUGHOUT THE DAY MAKING

THE LOCATION OF THE STRONGER LAKE EFFECT BANDS THE MAIN SOURCE OF

UNCERTAINTY IN THE FORECAST WELL INTO THIS EVENING.

&&

.LONG TERM...TONIGHT THROUGH THURSDAY

COMPACT UPPER LEVEL LOW WILL SHIFT FROM NORTHERN LOWER MICHIGAN TO

LAKE ERIE BY 12Z SATURDAY THEN TO THE NEW YORK/PENNSYLVANIA AREA BY

SATURDAY EVENING. A WEAKENING VORT LOBE/COLD POOL WILL PIVOT

SOUTHWEST ACROSS LOWER MICHIGAN BEHIND THE DEPARTING LOW DURING THE

DAY ON SATURDAY KEEPING A COOL NORTHERLY FLOW OVERHEAD. OUR CONCERN

DURING THIS TIME FRAME WILL SHIFT FROM LAKE EFFECT SNOWS OFF LAKE

MICHIGAN TO LAKE EFFECT SNOW OFF LAKE HURON AS THE PERSISTANT

NORTHWESTERLY FLOW THAT HAS BEEN IN PLACE OVER THE REGION

TRANSITIONS TO A DEEP NORTHERLY FLOW BEHIND THE DEPARTING LOW. MOST

AREAS WILL CONTINUE TO SEE LIGHT SNOW SHOWERS ON FRIDAY NIGHT WITH

MINOR ADDITIONAL ACCUMULATIONS...GENERALLY AN INCH OR LESS.

BY SATURDAY MORNING...SEVERAL FACTORS LOOK PROMISING FOR A HEAVY

LAKE EFFECT SNOW EVENT FOR PORTIONS OF THE THUMB. FIRST TO NOTE ARE

THE IMPRESSIVE SOUNDINGS OVER LAKE HURON ON SATURDAY WITH LAKE

INDUCED CAPE OF ALMOST 700 J/KG AND EQUILIBRIUM LEVELS OF 14000

FEET. LIFT WILL BE ENHANCED BY A BAND OF MID LEVEL DEFORMATION

PIVOTING OVER LAKE HURON DURING THE MORNING WITH AMPLE MOISTURE

AVAILABLE THROUGH AT LEAST 700MB. THE TIGHT CYCLONIC FLOW SHOULD AID

IN A HEAVY BAND DEVELOPING OFF THE LAKE INTO HURON COUNTY BY EARLY

SATURDAY MORNING AND WOULD NOT BE SURPRISED TO SEE A FEW LIGHTNING

STRIKES GIVEN THE -38C COLD POOL AT 500MB OVERHEAD. OF COURSE WITH

ANY LAKE EFFECT EVENT THERE ARE SOME UNCERTAIN FACTORS. INITIALLY

THESE INCLUDE WHERE EXACTLY THE BAND WILL SET UP...HOW WELL IT WILL

HOLD TOGETHER AS THE FLOW SHIFTS FROM NORTHEAST TO NORTH

NORTHWEST...AND HOW FAR INLAND IT WILL EXTEND. STILL THINKING A

PERIOD OF 2+ INCH PER HOURS SNOWFALL RATES ARE POSSIBLE SATURDAY

MORNING AND HAVE DECIDED TO ISSUE A LAKE EFFECT SNOW WATCH FOR HURON

COUNTY. MODERATE TO HEAVY SNOW SHOWERS ARE EXPECTED TO EXTEND SOUTH

INTO TUSCOLA/SANILAC COUNTIES BUT SHOULD BE FOR A SHORTER DURATION

AS THE BAND SHIFTS FROM ONE COUNTY TO THE OTHER. A BREAK IN THE

SNOWFALL LOOKS LIKELY LATER IN THE DAY AS A LOW LEVEL TROUGH PIVOTS

ACROSS THE LAKE BEFORE SNOW SHOWERS RE-FOCUS ALONG THE EASTERN EDGE

OF THE THUMB DURING THE EVENING HOURS. THE MOISTURE DEPTH AND

INVERSION HEIGHTS LOWER AFTER MIDNIGHT ON SATURDAY WHICH CORRESPONDS

TO MID-LEVEL WINDS BACKING MORE TO THE NORTHWEST AND FORCING THE

BAND FURTHER OFFSHORE. UNLIKE SOME LAKE EFFECT EVENTS...ALL OF HURON

COUNTY MAY RECEIVE SNOWFALL FROM THIS EVENT WITH CENTRAL PORTIONS OF

THE COUNTY TARGETTED DURING THE MORNING AND EASTERN PORTIONS

TARGETTED LATER IN THE DAY. POTENTIAL EXISTS FOR GREATER THAN 6-8

INCHES OF SNOW AND WILL RUN THE WATCH FROM 5 AM SATURDAY TO 1 AM

SUNDAY. MORE UNCERTAINTY EXISTS IN TOTAL ACCUMULATIONS FOR TUSCOLA

AND SANILAC COUNTIES AND WILL LEAVE THEM OUT OF THE WATCH FOR NOW.

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