11 Dec 2010 Extended Forecast

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MAP:  STATEWIDE SNOWFALL TOTALS.

STORM TOTALS FROM AROUND THE AREA................

1013 AM SNOW MARSHALLTOWN 42.04N 92.91W
12/12/2010 M2.5 INCH MARSHALL IA CO-OP OBSERVER

1013 AM SNOW TOLEDO 41.99N 92.58W
12/12/2010 M3.0 INCH TAMA IA CO-OP OBSERVER

1024 AM SNOW MONTEZUMA 41.58N 92.53W
12/12/2010 M3.0 INCH POWESHIEK IA CO-OP OBSERVER

1024 AM SNOW GRINNELL 41.74N 92.72W
12/12/2010 M4.0 INCH POWESHIEK IA CO-OP OBSERVER

1026 AM SNOW CLUTIER 42.08N 92.40W
12/12/2010 M2.0 INCH TAMA IA CO-OP OBSERVER

1027 AM SNOW MARSHALLTOWN 42.04N 92.91W
12/12/2010 M2.5 INCH MARSHALL IA CO-OP OBSERVER

MAXIMUM WIND GUSTS AROUND THE AREA............

GRINNELL - 51MPH AT 2:55AM SUNDAY MORNING - AT 8:15PM SAT EVENING THE WIND BEGAN GUSTING OUT OF THE NORTH, AND HAVE NOT HAD AN HOURLY WIND GUST BELOW 37MPH THRU THIS POSTING (SUNDAY 1:45PM).....

OTTUMWA - 52MPH AT 2:53AM SUNDAY.....


Very strong northerly winds will persist through much of the day today. This will cause significant blowing snow and visibility restrictions through the late morning hours. In addition, bitterly cold temperatures combined with the strong north winds will result in wind chill readings as low as 25-30 below zero at times. The strong north winds will begin to relax late this afternoon and into this evening.

WIDESPREAD BLIZZARD CONDITIONS OCCURRED ACROSS IOWA OVERNIGHT. NUMEROUS ROADS WERE CLOSED OVER NORTHERN AND WESTERN PORTIONS OF THE STATE INCLUDING INTERSTATE 80 WEST OF DES MOINES. SNOWFALL AMOUNTS OF 6 TO 10 INCHES WERE COMMON NORTH OF HIGHWAY 20 WHILE 3 TO 6 INCHES FELL OVER CENTRAL IOWA. NORTHWEST WIND GUSTS OF 50 TO 65 MPH HELPED PROPEL THE SNOW WHICH RESULTED IN THE BLIZZARD CONDITIONS. THE STRONG NORTHWEST WINDS ALSO BROUGHT AN ARCTIC INTRUSION INTO THE STATE. BY 5  AM TEMPERATURES HAD FALLEN BELOW ZERO OVER NORTHWEST IOWA...WHILE READINGS WERE HANGING ON IN THE LOWER 20S OVER THE SOUTHEAST. DANGEROUS WIND CHILL VALUES OF 25 BELOW TO 35 BELOW WERE IN PLACE OVER THE NORTHWEST.


THE AREA OF LOW PRESSURE THAT BROUGHT BLIZZARD CONDITIONS TO THE REGION ON SATURDAY... WILL RACE QUICKLY NORTHEAST IN THE NEW ENGLAND REGION BY THIS EVENING. ARCTIC HIGH PRESSURE WILL RIDGE INTO MUCH OF THE CENTRAL AND NORTHERN PLAINS TODAY WITH PRECIPITATION ENDING AND SKIES CLEARING. NORTHWEST WINDS WILL REMAIN STRONG TODAY WITH GUSTS NEAR 40 MPH POSSIBLE. THE WIND COMBINED WITH COLD TEMPERATURES TODAY RANGING FROM 5 BELOW NORTH TO AROUND 10 ABOVE SOUTH...WILL PRODUCE A BONE CHILLING DAY. THE WIND WILL SUBSIDE TONIGHT WITH CLEAR SKIES ALLOWING TEMPERATURES TO RADIATE OUT ALLOWING FOR MAXIMUM COOLING CONDITIONS OVER THE FRESH SNOW PACK. OVERNIGHT LOWS WILL DROP TO NEAR 20 BELOW OVER NORTHERN IOWA AND SOUTHERN MINNESOTA BY MONDAY MORNING. MONDAY AND MONDAY NIGHT WILL REMAIN QUITE COLD BEFORE A SLOW WARMING TREND BEGINS TUESDAY. THE NEXT CHANCE FOR SNOW ARRIVES LATE TUESDAY NIGHT AND INTO WEDNESDAY.

11 Dec 2010 Extended Forecast

Today12th - Continued Windy (Gusts to 40mph) with Blowing Snow thru sunset - High Temp near 10 with Wind Chill near -15 - Winds will diminish to 15-20mph after sunset - wind chills -25 overnite.

Mon and Tues 13th/14th - Partly Cloudy - High Temps 7-18 - Lows near -5 - Wind Chill -20 Monday Morning.

Wed and Thurs 15th/16th - Mostly Cloudy with Snow Wed into early Thurs (1-2 Inches) - Then Partly Cloudy Late Thurs - Highs 25-30 - Lows 10-15.

Fri thru Tues 17th thru 21st - Partly to Mostly Cloudy with Snowshowers Friday, Sunday and Monday - Otherwise Dry - Brisk Northerly Wind.

22nd thru CHRISTMAS - Unsettled with Snow on the 23rd and 24th - We may even a slight warm-up to the mid/high 30's around the Christmas Holiday - If that happens, expect a mixed bag (Ice/Sleet) of precip on or shortly after the 25th...............

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