N. Ind. NWS gives emergency managers “heads up” on coming storms

Winter storm banner graphicThe northern Indiana office of the National Weather Service (NWS) sent email messages today to emergency managers and the news media regarding two winter storm systems that could affect the office’s 37-county warning area (CWA) between Feb. 28 and March 4.

Storm 1: Sat. night into Sunday night

IWX CWA map
Area enclosed in red line is the county warning (forecast) area of the northern Indiana National Weather Service office. Click the map to see a larger version.

The NWS forecasts two storm systems to affect the CWA of the northern Indiana office (see map at right). The first will arrive Saturday Night into Sunday (February 28-March 1). Regarding this system, NWS meteorologists have high confidence that snow will accumulate but low confidence regarding the location of highest snowfall amounts.

Snow should fall Saturday evening through Sunday night, with the heaviest snowfall occurring Sunday afternoon and Sunday night. The NWS forecasts storm-total accumulation of up to six inches with accumulation being greater in the southern parts of the northern Indiana office’s CWA than in the northern parts.

During this storm, roads could become snow-covered and slippery, but surface temperatures should remain high enough to allow road treatments to remain effective.

Storm 2: Tue. morning into Wednesday

A second storm will reach the area early Tuesday morning and continue into Wednesday (March 3-4).

As of this afternoon, NWS forecasters have low confidence in precipitation types and duration in any location with this storm. They expect, however, the storm to begin with snow, followed by period of freezing rain, then all rain.

The potential for snow and ice accumulation is greatest Tuesday morning, with rain falling Tuesday afternoon possibly into Wednesday.

The combination of runoff from the rain, melting snow and frozen rivers could cause flooding and ice jams.

As is always the case with winter storms, forecast confidence will increase as the storm approaches. People should monitor forecasts for changes.

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