Official Winter Storm Thread for 12/21 - 12/26

alarson

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Freese posts updated forecasts on CR (as Cyclonegenesis), one of the few things i miss about having a membership there.
 

garn91

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Freezing Rain Adivsory now posted for Ames and to the north until 6am tomorrow(Winter Storm Watch still remain's in effect).

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DES MOINES IA
1245 PM CST TUE DEC 22 2009

...ICY CONDITIONS TODAY...FOLLOWED BY A MAJOR WINTER STORM
WEDNESDAY THROUGH FRIDAY...

.ICY CONDITIONS WILL AFFECT NORTHERN AND CENTRAL IOWA INTO
TONIGHT. THEN...AN APPROACHING LOW PRESSURE SYSTEM WILL BRING US
RAIN AND A MIX OF WINTRY WEATHER STATEWIDE THROUGH FRIDAY. HEAVY
PRECIPITATION IS EXPECTED...FOLLOWED BY STRONG WINDS ON THURSDAY
AND FRIDAY.

IAZ004>007-015>017-023>028-033>039-044>050-057-058-230245-
/O.NEW.KDMX.ZR.Y.0001.091222T1900Z-091223T1200Z/
/O.CON.KDMX.WS.A.0007.091223T1200Z-091226T0000Z/
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-
BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-
INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...FOREST CITY...
NORTHWOOD...EMMETSBURG...GARNER...MASON CITY...POCAHONTAS...
HUMBOLDT...CLARION...HAMPTON...ALLISON...WAVERLY...SAC CITY...
ROCKWELL CITY...FORT DODGE...WEBSTER CITY...ELDORA...
GRUNDY CENTER...WATERLOO...DENISON...CARROLL...JEFFERSON...
BOONE...AMES...MARSHALLTOWN...TOLEDO...AUDUBON...GUTHRIE CENTER
1245 PM CST TUE DEC 22 2009

...FREEZING RAIN ADVISORY IN EFFECT UNTIL 6 AM CST WEDNESDAY...
...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH FRIDAY AFTERNOON...

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FREEZING
RAIN ADVISORY...WHICH IS IN EFFECT UNTIL 6 AM CST WEDNESDAY. A
WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH FRIDAY AFTERNOON.

...FREEZING RAIN ADVISORY...

* TIMING...FREEZING DRIZZLE WAS ALREADY OVER NORTHERN IOWA. IT
WILL SPREAD SOUTHWARD WITH TIME...INTO CENTRAL IOWA BY THIS
EVENING.

* ICE ACCUMULATIONS...UP TO A TENTH OF INCH OF ICE ACCUMULATION
IS EXPECTED THROUGH WEDNESDAY MORNING...FROM U.S. HIGHWAY 20
NORTHWARD. LESSER AMOUNTS ARE EXPECTED TO THE SOUTH.

* VISIBILITY...THE FREEZING DRIZZLE WILL COMBINE WITH AREAS OF FOG
TO REDUCE VISIBILITIES TO LESS THAN ONE MILE...AND AS LOW AS A
HALF MILE IN AREAS.

* IMPACTS...TRAVEL WILL BE HAZARDOUS WITH AREAS OF BLACK
ICE...ESPECIALLY ON LESS TREATED ROADS. IT WILL TAKE ONLY VERY
MINOR ICE ACCUMULATIONS TO CAUSE TRAVEL DIFFICULTIES. IN
ADDITION...THE ICE CAN BE DIFFICULT TO SEE ON THE ROAD...SO A
ROAD THAT APPEARS TO BE CLEAR MAY ACTUALLY BE ICY.
 

chuckd4735

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I can't watch that....how much snow is KCCI saying for Des Moines on Friday?

They don't really give any totals, just that we will see some ice tonight, switching to all rain Wednesday afternoon until Thursday late, than snow all day Friday.
 

jsb

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They don't really give any totals, just that we will see some ice tonight, switching to all rain Wednesday afternoon until Thursday late, than snow all day Friday.


Thanks....the NWS is still predicting 2-4" in Des Moines, but the latest from Freese-Notis has me worried at 10"+. I probably won't have to sweat things on Friday, if we are in the 2-4" range, but 10"+ would make things very, very dicey for me.
 

jsb

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we will get what we get....cant stop it....


Clearly, but I am on a very tight schedule and I'd like to know if I am going to miss the reason that I am spending a lot of money on a trip to England. So I'm very interested in the track of the storm.
 

jsb

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matmann22

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This site has now updated from the 2-4 they had this morning to anywhere from 10-12" for the Des Moines area. You can see that north and west right now are the worst. But Freese says this thing could shift again and if it moves east you can see what kind of snow we are talking about.

Earl's GIS Radar Site Overlays Page

Freese is adjusting the forecast based on the 12 UTC models coming in. Almost all have a pronounced eastward shift to the storm track. This would be a much snowier track for Central Iowa.

FOr example, one model moved the low from South of Des Moines to near Keokuk when you compared the latest 2 runs.

I know one run doesn't necessarily make a trend but the second model difference reinforces the first one. The 12 UTC runs have the first low coming up to around Council Bluffs on Thursday and then fizzling. While the fizzle happens, a second low develops and races up on a line that roughly mimics the Mississippi River. Very bad track for Central Iowa compared to a low right over the top of Des Moines.

The third model difference is at least one model hangs that second low over Iowa or really close to Iowa until SUNDAY !

Whether we get flooding rains, an ice storm, a snow storm, or some combination of the 3 this is going to be one EPIC Holiday storm. Just an amazing setup, an amazing storm track (thanks to Davis Strait blocking for you diehard weather geeks or mets) , and total precip estimates around 2 inches (liquid).
 

bawbie

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any updates in the last few hours?


the afternoon updates seemed to further the trend of moving the warm air further north.

there is a freezing rain advisory for tonight and tomorrow morning, but after that it looks like a rain event for most areas south of Hwy 20.

Northwest of a Fort Dodge to Mason City line is still supposed to get the bulk of the snow. The heaviest snow seems to be forecast for a Sioux Falls to Minneapolis line.

For the rest of the state, it'll be freezing rain/drizzle or sleet tonight and tomorrow morning, then rain until Thursday night when 2-6 inches of snow are possible Christmas day.

The detailed writeups continue to stress that the models don't have a good grasp on the many factors going into this system and the models aren't agreeing, much moreso than usual.
 

DRCHIRO

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Im driving from Des Moines to Le Mars tonight, any idea what l 80 and l 29 look like or are going to look like after 6?
 

Jer

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I've seen a few trends point towards 8-10 or so for DSM on Thursday through Saturday AM. Is that what others are seeing too?
 

alarson

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the afternoon updates seemed to further the trend of moving the warm air further north.

I'm confused, i thought the new trend had things moving east so we'd get more snow\less rain?
 

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