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January 10th-12th OV/MW/GL Winter Storm prospects


Harry

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE QUAD CITIES IA IL

320 PM CST MON JAN 10 2011

DISCUSSION

SHORT TERM...TONIGHT AND TUESDAY

THE NEAR TERM OCCUPIED WITH HANDLING OF INCOMING INVERTED TROF

COMPLEX AND SNOW EVENT. AFTER ASSESSING THE NEW 12Z SHORT RANGE

RUNS...MUCH OF ONGOING PACKAGE STILL APPEARS TO BE ON TRACK. EAST-

SOUTHEAST DRY LLVL FETCH HAVING A LARGE PRECIP SFC ARRIVAL INHIBITING

EFFECT...BUT SIGNS OF LOWER LEVEL SATURATION FINALLY TAKING PLACE

ACRS THE WESTERN AND SOUTHERN CWA. THIS BATTLE TO LAST WELL INTO

THE MID EVENING PERIOD...WITH MODERATE SNOW DEVELOPING ACRS THE FAR

WEST AND SOUTH...WHILE THE NORTHEAST THIRD OF THE CWA REMAINS DRY

OR SEES JUST A FEW STRUGGLING FLAKES. SOME MORE WIDESPREAD BETTER

RADAR RETURNS OF 25-30 DBZ/S NOTED ACRS MUCH OF CENTRAL INTO

NORTHEAST MO HEADED THIS WAY...BUT OF COURSE WILL HAVE TO BATTLE

THE DRY LLVL FETCH. WILL WALK UP CATEGORICAL POPS ACRS MOST OF THE

DVN CWA AS THE NIGHT PROGRESSES...AND INTO TUE MORNING BEFORE THE

MORE ORGANIZED SNOW BANDS START TO PULL OUT OF THE EASTERN CWA LATER

TUE AFTERNOON AND EARLY EVENING. BOTH THE GFS AND ESPECIALLY THE NAM

CONTINUE TO ADVERTISE RATHER DEEP SATURATION OF 150-200+ MB IN THE

FAVORED -12 TO -18 C LAYER FOR DENDRITIC PRODUCTION AND HIGHER LSR/S

MAINLY FROM 06Z-12Z OR SO TUE. THE GFS IS A BIT MORE OUT OF SINK

HOWEVER WITH THIS SATURATION COMBINED WITH THE DEEPER LIFT...MORE

OPTIMUM LIFT EARLIER IN THE EVENING STILL BATTLING DRYING LLVL FETCH

WITH DEEPER SATURATION AFTER MIDNIGHT...WHILE THE NAM IS MORE IN LOCK

STEP WITH THE DEEPER SATURATION PROFILES. THUS THE NAM IS SUGGESTING

WIDESPREAD 3.5 TO 5.5 INCH AMOUNTS ALMOST CWA-WIDE USING LSR/S OF

15:1 TO 18:1 AVERAGE...WHILE THE GFS IS MORE IN THE LINE OF 2-4

INCHES. EXTRAPOLATING UPSTREAM TRENDS AND SOME WORRY ABOUT THE

VERTICAL PROFILES NEAR OR AFTER MIDNIGHT FOR SOME DECENT

ACCUMULATIONS OF UPWARDS AN INCH AN HOUR DURING A 2-3 HR PERIOD

BETWEEN 06Z-12Z TUE...WILL SIDE CLOSER TO THE NAM ACRS THE SOUTHWEST

TWO THIRDS OF THE CWA...AND THE DRIER GFS IN THE NORTHEAST AND FAR

EASTERN THIRD OF THE FCST AREA IN THE FACE OF DRYING INFLUX.

ELEVATED FORCING IN VCNTY OF LLVL TROF AXIS AS IT PIVOTS OVER THE

CWA...WILL BE AIDED BY PASSING H7 MB LOW AND NOSE OF 130+ KT LEFT

EXIT REGION OFF UPPER JET HOOKING OVER THE SOUTHERN PLAINS AND UP THE

OH RVR VALLEY. COMBINED WITH DEEPER SATURATION...THIS FAVORS AN AXIS

30 MILES EITHER SIDE OF A LINE FROM WILLIAMSBURG IA...TO SOUTH OF

MUSCATINE AND JUST EAST OF MONMOUTH IL FOR AN AREA OF WIDESPREAD 4-6

INCH AMOUNTS BY EARLY AFTERNOON TUESDAY. WILL EXPAND THE ADVISORY 1-2

COUNTIES TO THE NORTHEAST FRO WIDESPREAD 3-4 INCHES...ALTHOUGH THE

FAR NORTHEAST FRINGE OF THE EXPANDED ADVISORY COUNTIES MAY BE

MARGINAL WITH A QUICK DROP OFF OF SNOW ACCUM TOTALS FROM ONE PART OF

THE COUNTY TO THE OTHER. IN GENERAL...A RATHER LONG DURATION ADVISORY

IS EXPANDED SOME BUT CONTINUES AT SAME TIME PERIODS ALTHOUGH THE

EASTERN ADVISORY COUNTIES WILL NOT HAVE IMPACTS TIL AFTER MID

EVENING. ..12..

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12z IWX WRF still screwing southern MI but showing the lake enhancement/lake effect quite nicely.

Just one model....NAM/NAMM continue to show a general .24 give or take a few hundredths for southern lower....GFS a little less....to me a solid 3 or 4 inches looks about right....maybe 5 in the border counties if any semblance of banding or enhancement from Lake Erie occurs.

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I think you're too low. Things don't look to have changed all that much from last night. Final call for LAF is 4-6". I do think there could be isolated amounts over 6" around the area. With the DGZ still progged to be 150-200 mb deep, I'm counting on high ratios to get us there.

Probably. But you know me, pessimistic until the end. :arrowhead:

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Probably. But you know me, pessimistic until the end. :arrowhead:

Surface/mid level low track, upper levels, large DGZ with good lift...whatever you want to look at, it's favorable. I suppose there's added confidence given our good fortune this winter, but this is a decent setup on its own.

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Surface/mid level low track, upper levels, large DGZ with good lift...whatever you want to look at, it's favorable. I suppose there's added confidence given our good fortune this winter, but this is a decent setup on its own.

Can't deny any of the above. Like I said earlier, I fear getting caught in no man's land, which the 12z NAM kind of did to us. Regardless, I jumped too soon and probably should have left well enough alone. Anyways, you'll need to measure because I'm out of town...or I guess we could go by Chad.

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With this storm, we should break our normal average seasonal total. We'll be making good progress to a Top 10 Winter.

Yeah this will most likely put us above average. BTW, when we did our winter outlooks back in the Fall, I predicted 23" for LAF. Right where we're at right now. :lightning:

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Just one model....NAM/NAMM continue to show a general .24 give or take a few hundredths for southern lower....GFS a little less....to me a solid 3 or 4 inches looks about right....maybe 5 in the border counties if any semblance of banding or enhancement from Lake Erie occurs.

ya i know, thats why I pointed it out, it has been doing that for several runs.

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snow really picking up now over IA moderate snow in many places

looks like upgrade to warning may be needed if trends continue

0357 PM SNOW AUDUBON 41.72N 94.93W

01/10/2011 M7.0 INCH AUDUBON IA TRAINED SPOTTER

0502 PM SNOW YALE 41.78N 94.36W

01/10/2011 M6.0 INCH GUTHRIE IA TRAINED SPOTTER

SNOWFALL REPORT FROM FIRE STATION

0206 PM SNOW CUMBERLAND 41.27N 94.87W

01/10/2011 M7.0 INCH CASS IA TRAINED SPOTTER

STORM TOTAL

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snow really picking up now over IA moderate snow in many places

looks like upgrade to warning may be needed if trends continue

0357 PM SNOW AUDUBON 41.72N 94.93W

01/10/2011 M7.0 INCH AUDUBON IA TRAINED SPOTTER

0502 PM SNOW YALE 41.78N 94.36W

01/10/2011 M6.0 INCH GUTHRIE IA TRAINED SPOTTER

SNOWFALL REPORT FROM FIRE STATION

0206 PM SNOW CUMBERLAND 41.27N 94.87W

01/10/2011 M7.0 INCH CASS IA TRAINED SPOTTER

STORM TOTAL

yup...just saw that....amazing how that radar exploded....upper level energy diving in

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Yeah it has been pretty futile in Western MI this year. Only about 15 inches of snow on the season here when we should have somewhere well in the 30s.

It's amazing to me just how similar this winter is here as last winter...actually this year may be even worse. All these northerly lake effect events hitting Indiana combined with all the systems going west and south....it's just been so frustrating. Where do you live in Western Michigan?

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snow really picking up now over IA moderate snow in many places

looks like upgrade to warning may be needed if trends continue

0357 PM SNOW AUDUBON 41.72N 94.93W

01/10/2011 M7.0 INCH AUDUBON IA TRAINED SPOTTER

0502 PM SNOW YALE 41.78N 94.36W

01/10/2011 M6.0 INCH GUTHRIE IA TRAINED SPOTTER

SNOWFALL REPORT FROM FIRE STATION

0206 PM SNOW CUMBERLAND 41.27N 94.87W

01/10/2011 M7.0 INCH CASS IA TRAINED SPOTTER

STORM TOTAL

Problem is most areas started receiving snow around yesterday noon or early afternoon, thus don't look to achieve the 8 inch in 24 hrs criteria. I can verify that the snow west of I-35 has picked up in intensity but at least in my area I'm not achieving inch per hour rates.

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It's amazing to me just how similar this winter is here as last winter...actually this year may be even worse. All these northerly lake effect events hitting Indiana combined with all the systems going west and south....it's just been so frustrating. Where do you live in Western Michigan?

I have family in Muskegon & Norton Shores and head up there at least once a month. While there has been very little synoptic snow for the area season-to-date, I beleive you have made out just fine during the past couple lake events.

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