MONDAY THRU WED: THERE WILL BE TWO SYSTEMS TO DEAL WITH FROM MONDAY TO WED. THE FIRST SYSTEM WILL BE THE WEAKEST AS AS AN UPPER LEVEL WAVE MOVES INTO NRN IOWA THRU THE DAY MONDAY. EXPECT LT SNOW TO BREAK OUT BY MID DAY - AND DIMINISH OVERNITE, AND CHANGING TO RAIN OR DRIZZLE - DROPPING AN INCH OF SNOW IN POW CTY BEFORE CHANGING OVER TO RAIN - MELTING WHAT SNOW FELL....
THE NEXT SYSTEM IS DEVELOPING OVER THE TX/OK PANHANDLES AND WILL TRACK INTO IOWA EARLY TUES INTO WED CHANGING THE LT SNOW OVER TO RAIN EARLY TUES. AS THE LOW MOVES THRU CENTRAL IOWA, POW CTY SHOULD STAY IN WARMER SOUTHERLY FLOW - SPARKING WIDESPREAD SHOWERS AND TSTORMS. SOME STORMS COULD BE STRONG THRUOUT THE EASTERN 1/2 OF IOWA LATE TUES.....EXPECT A RAIN/SNOW MIX OVERNITE TUES - EVENTUALLY CHANGING TO ALL SNOW EARLY WED - AND TAPER OFF BY MID AFTERNOON.
THE HEAVIEST SNOW FROM THIS SYSTEM WILL BE IN NRN IOWA, MN., THE DAKOTAS, AND WEST/CENTRAL NEB WHERE BLIZZARD CONDITIONS WILL BE SEEN TUES AND WED....BY THE TIME SNOW BEGINS IN CENTRAL IOWA, ACCUMULATIONS SHOULD BE LIGHTER FROM SOUTH TO NORTH. THIS IS HIGHLY DEPENDENT ON EXACTLY WHEN THE RAIN CHANGES OVER TO SNOW. AS IT STANDS RIGHT NOW, I-80 IS VERY CLOSE TO THE CUTOFF AS FAR AS LIGHTER AMOUNTS VS. MODERATE SNOWFALL. POW CTY IS LIKELY TO SEE 2+ INCHES BY THE TIME SNOW ENDS LATER WED - WITH AREAS NORTH OF I-80 MORE IN THE 2-4 INCH RANGE.....
Today 5th: Morning Flurries/Breezy - then Dry. High 32
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Sunday and Mon 6th/7th: Dry Sun - Lt Snow/Breezy Mon (1"). Highs Low/Mid 30's Lows 17/25
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Tues thru Thurs 8th-10th: Rain/Snow - then Isolated Tstorms/Rainshowers Later Tues into Wed Morning - changing to Snow/Wind by Afternoon (2")- Dry Thurs. Highs near 40 dropping to 32 by Thurs.
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Fri and Sat 11th/12th: Dry Fri - Winter Mix Sat.
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Sun and Mon 13th/14th: Tstorms - Rain/Snow.
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Tues and Wed 15th/16th: Dry.
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Thurs thru Sun 17th-20th: Snow.
Additional comment on the upcoming Storm - this will likely be a Big One: Early next week (Tues/Wed), a major winter storm will affect the central Rocky Mountain region and the Great Plains with heavy snow and gusty winds.
A lot of wicked weather takes place in March. Intense collisions between air masses during this month often produce colossal storms that create blizzards and floods. Many of the worst storms on record have occurred in March.
The list includes the Great New England Blizzard of 1888 which produced 2-4 feet of snow with drifts up to 30 feet, the northern Great Plains Blizzard of 1966 that buried trains, and more recently in 1993 there was the Storm of the Century which produced over 2 feet of snow.
In addition to producing areas of drenching rain and thunderstorms, a swath of wind-driven snow will develop from part of the central Rockies to part of the Upper Midwest. Snowfall from Wyoming and northern Colorado across Nebraska, South Dakota, Minnesota, and Nrn Iowa will easily exceed 6 inches.
The strengthening low pressure system will also produce very windy conditions that will cause considerable blowing and drifting of snow. This raises the possibility of blizzard conditions Tuesday across part of the central Plains and the Upper Midwest.
In addition to a Plains blizzard will come the risk of a tornado outbreak and flooding problems farther to the south and east. Stay Tuned.....
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