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October 27-29 Rainy/Windy System Potential


Hoosier

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As we approach the event, the models have increased the rainfall across eastern Iowa into the 1-1.5" range as the combination of moisture from the south and forcing from the digging plains trough maxes out over this area.

 

Yeah looks to be a decent soaking for pretty much the entire sub.  Looking forward to a steady all day/evening rain.  

 

Looks like the rain will be leaving KC right around the time the world series starts tomorrow evening.  

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Typhoon winds with this storm really gonna do a job on the remaining leaves. Temp profiles definitely support a changeover to snow or at least a mix around here, but not sure surface temps are going to allow too many flakes to reach the ground. Regardless, something to track and a signal that winter is closing in.

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NAM has backed off (somewhat) on the precip accumulation (although the SREF plumes have averaged steadily higher) since yesterday but man, look at the LLJ on this system. Broad area of 50kt+ 850mb winds and numerous 80kt barbs showing up.

 

Not sure how well these winds will mix down being in the warm sector, but some embedded thunderstorms could yield some 50-60mph gusts I'd imagine.

 

rRlVnWd.gif

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Definite trend in the NAM the last several runs having the upper level low further south which leads to the wraparound precip/snow closer to our area...The fcst sounding below is for south of Madison, WI for overnight Wednesday into Thursday, closer to the IL/WI border. This run verbatim produces snow and accumulating snow across a good chunk of WI. Whether we see our first flakes or not, bombing lows and these big systems are fascinating to watch. Before this really gets going, looks like a pretty good soaking rain tomorrow and tomorrow evening.

 

 

 

 

 

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Models have slowed the northward progression of rain shield somewhat on the new 00z runs.  Would delay onset by 2-4hrs compared to previous runs.  That also delays the rain pushing out of KC tomorrow evening, so now I'm wondering if the game there could get significantly delayed or totally rained out.  

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Wednesday night looks on the mini brutal side locally...upper 30s temp.... 20+ mph winds ... and some showeres working in and out

 

I say bring it. It's a change from the rest of the month, which has been pretty dull.

 

NAM inching the rain in a bit sooner by the looks of it. Downpours should be really decent with a moisture transport like this.

 

namconus_ref_ncus_6.png

 

namconus_ref_ncus_9.png

 

NAM_221_2015102700_F27_PWATIN_SURFACE.pn

 

If snow flies here on Wednesday night, I'll be sure to report it! :snowing:

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The airmass does cool down enough late Weds night/early Thursday to be supportive of snow, though current model runs keep moisture too limited for anything other than maybe spotty flurries in northern IL based off forecast soundings. That could change, as per trends mentioned by Tsnow, but as of now, looking better for more than flurries in Wisconsin. If we don't get our first flakes Weds night, might be quite a while til the next shot at it.

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Looks like some heavy rain, wind, and even a chance of some lake effect rain/snow.

 

12042892_1138537916175895_24807247964137

 

STRONG COLD ADVECTION WITHIN THE DEEP CYCLONIC FLOW WILL SET
UP MULTIPLE BANDS OF LAKE EFFECT RAIN. LIKELY POPS WILL REMAIN IN
PLACE FOR THESE BANDS OF SHOWERS. THESE SHOWERS WILL CONTINUE
THURSDAY EAST OF THE LAKES... WITH TEMPERATURES BECOMING COOL ENOUGH
OVERNIGHT TO SUPPORT SOME SNOW ESPECIALLY OVER THE HIGHER TERRAIN OF
THE TUG/SOUTHERN TIER IN LOCATIONS AWAY FROM THE IMMEDIATE LAKE
SHORE. HAVE INCLUDED RAIN/SNOW WORDING... BUT CHANCES ARE THAT
DYNAMICAL COOLING IN THE HEAVIEST BANDS WOULD FORCE THE P-TYPE OVER
TO ALL SNOW BY EARLY FRIDAY MORNING.

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Thinking rainfall warnings go up later this evening if the RGEM continues to show amounts that are nearly double what the globals show at the moment. Good chance the high res models are onto something wrt mesoscale banding so amounts somewhere between the more bearish globals and more aggressive NAM/RGEM/HRDPS seem reasonable. The flood threat is definitely there as it looks like the highest QPF will be right over the GTA with Lehs from the easterly wind and a local frontogenesis maxima.

 

Current QPF summary around YYZ(amounts are in mm and approximate)

Euro ENS: 35-40mm

Euro OP: 45mm

GFS: 35-40mm

UKMET: 40mm

NAM: 55mm

RGEM: 65-70mm

NAM4km: 60mm

HRDPS: 50mm+(run not finished)

 

 I am going with a range of 35-55mm with local amounts to 90mm. All falls in ~15hrs.

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