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1/5-1/6 clipper system


Thundersnow12

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AREA FORECAST DISCUSSION  

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  

133 PM CST MON JAN 5 2015  

   

UPDATE  

 

130 PM CST  

 

HAVE DECIDED TO UPGRADE THE SOUTHERN TIER OF  

COUNTIES...LIVINGSTON...FORD...IROQUOIS...BENTON...TO A WINTER  

STORM WARNING FOR THIS EVENING. WITH AN INTENSE BAND OF SNOW  

QUICKLY SPREADING CENTRAL AND SOUTHERN IOWA PRODUCING SNOWFALL OF AN  

INCH OR BETTER PER HOUR AND THE LOW LEVEL CIRCULATION  

STRENGTHENING OVER THE NEXT FEW HOURS...FGEN FORCING LOOKS TO  

FURTHER FOCUS INTO CENTRAL ILLINOIS INTO EARLY EVENING. AM  

THINKING THAT THE PEAK INTENSITY/DURATION AND THEREFORE PEAK  

AMOUNTS WILL BE RIGHT ALONG THE SOUTHERN BORDER OR JUST SOUTH.  

AFTER DISCUSSION WITH NEIGHBORING WFOS REGARDING THE INTENSE SNOW  

RATES...IMPACTS...AND THE FACT THAT 6-7 INCHES IS LOOKING MORE  

FAVORED OVER AT LEAST A PORTION OF THE FAR SOUTHERN TIER HAVE  

OPTED TO UPGRADE TO A WARNING.  

 

MDB  

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It's a good call, IMO. 12z Euro is pretty dry for us, and best snows look to skirt north of us. I'd probably lean more 3" than 5"...

 

 

Almost everything except the Euro has a narrow band of slightly higher precip (have to look at smaller intervals...doesn't really show up when looking at .25 intervals) over or just south of us...though areas further south may have slightly lower ratios to offset.  I'm still pretty comfortable with 4-6" and think someone around here could go a bit over 6".   

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From my experience, the SREF plumes are not used much as part of the snowfall forecast by the office. The ratios seem overdone like the ratios on the Cobb output often are.

 

 

yeah, i've only seen them mentioned once. They had a nice run IMBY last winter with a couple of long duration 12" events but that's about it. lowering the ration to 18:1 puts the totals right in line with the current thinking out of LOT

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What? That's sorta strange considering the WWA was updated an hour and half ago to lower amounts.

 

 

Maybe that was just the midday update.  I'll take a guess and say that happened prior to coordination for the afternoon package, specifically since LOT pulled the trigger on a warning for their southern tier.

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IND WSW

 

 

 

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
305 PM EST MON JAN 5 2015

...THE FIRST WINTER STORM OF THE SEASON IS EXPECTED ACROSS
PORTIONS OF CENTRAL INDIANA TONIGHT INTO TUESDAY MORNING...

INZ021-028>031-035>042-046>049-060415-
/O.UPG.KIND.WW.Y.0002.150106T0000Z-150106T1500Z/
/O.NEW.KIND.WS.W.0001.150106T0000Z-150106T1500Z/
CARROLL-WARREN-TIPPECANOE-CLINTON-HOWARD-FOUNTAIN-MONTGOMERY-
BOONE-TIPTON-HAMILTON-MADISON-DELAWARE-RANDOLPH-HENDRICKS-MARION-
HANCOCK-HENRY-
INCLUDING THE CITIES OF...LAFAYETTE...FRANKFORT...KOKOMO...
CRAWFORDSVILLE...ANDERSON...MUNCIE...INDIANAPOLIS
305 PM EST MON JAN 5 2015

...WINTER STORM WARNING IN EFFECT FROM 7 PM THIS EVENING TO 10 AM
EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A WINTER
STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 7 PM THIS
EVENING TO 10 AM EST TUESDAY. THE WINTER WEATHER ADVISORY IS NO
LONGER IN EFFECT.

* ACCUMULATIONS: SNOWFALL OF 4 TO AS MUCH AS 7 INCHES IS EXPECTED AT
THIS TIME.

* TIMING: SNOWFALL WILL OVERSPREAD THE AREA AFTER 7 PM...WITH
THE MOST INTENSE SNOWFALL OCCURRING FROM AROUND 10 PM THROUGH
AROUND 4 AM TUESDAY.

* OTHER IMPACTS: SNOWFALL RATES COULD EXCEED 1-2 INCHES PER HOUR
FOR A BRIEF PERIOD OF TIME IN SPOTS WHICH WILL GREATLY REDUCE
VISIBILITIES AND MAKE REMOVAL EFFORTS EXTREMELY DIFFICULT DURING
THAT TIME. TRAVEL WILL BE HAZARDOUS DURING THE TUESDAY MORNING
COMMUTE. WINDS WILL INCREASE DURING THE DAY ON TUESDAY WHICH
WILL CAUSE DRIFTING AND LIKELY PROLONG HAZARDS ON AREA ROADWAYS.

* WIND CHILL VALUES: SINGLE DIGIT TO LOW TEEN WIND CHILLS CAN BE
EXPECTED DURING THE SNOW...WITH MUCH COLDER WIND CHILLS EXPECTED
DURING THE MIDDLE PORTION OF THE WEEK.
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Arctic air is definitely firmly entrenched today - still 1* outside.

 

Yes, you do win some and lose some. 2.1" in my grid specifically. Guess I ride that and hope it holds true.

Sick snow fall rates at Sioux Falls and Des Moines! :snowing:

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Arctic air is definitely firmly entrenched today - still 1* outside.

Yes, you do win some and lose some. 2.1" in my grid specifically. Guess I ride that and hope it holds true.

Sick snow fall rates at Sioux Falls and Des Moines! :snowing:

Road crews were not exactly on top of things out here, and the cold temps are not helping. With snow already on many side roads, things will go to hell quickly when it starts falling

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