(5:30PM - 4/27/19) Evening update regarding the ongoing late season snowstorm across portions of Northern Illinois...
A large area of moderate to at times heavy snow has been ongoing across Northern Illinois this morning and afternoon...generally north of I-88. Upwards of 1-4" of snow has been reported across much of this area. Snow will continue across the aforementioned area into tonight, ending from west to east early tonight. The rain/snow line continues to be focused in the vicinity of I-88, and will likely push southward with time as the storm system passes south of the area this evening and tonight, flipping rain to snow for more areas. Additional accumulations of up to a few to a couple inches is possible, depending on location. Conditions continue to be favorable for thundersnow to be possible at times as well.
Final snowfall totals will be in the 3-6" range in the main axis for most areas north of I-88 across Northern Illinois, with isolated totals in excess of 6" likely. This is slightly lower than previous forecasts, as observational trends show snow has struggled sustain very heavy intensity and significant banding has not materialized. Snowfall amounts will quickly taper south of the main axis, with a sharp gradient expected. This will be especially true for areas near and just north of I-88, where totals could go from 1" to 5" in the span of a few miles. We have continued to try to depict this tight gradient as best as we can on our TAM snowfall forecast map. It should also be noted that we have removed
Below is our updated TAM snowfall forecast for this event.
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