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Arctic Air Mass Lingers for Areas of the East; Critical Fire Weather for the Plains; Active Weather Pattern for Hawaii

Arctic air lingers for the east, however, winds will slowly subside and a slow moderating trend starts during the week. Moisture continues to provide rainfall and higher elevation snow for the Pacific Northwest, northern California and northern Rockies through Monday. For the State of Hawaii, dangerous surf conditions with strong winds and heavy rainfall will impact the islands through Monday. Read More >

Overview

A quick moving, but potent early spring system brought a narrow band of heavy snow to portions of eastern Iowa, northern Illinois, and southern Wisconsin late Thursday night into early Friday afternoon (3/22/2024). A narrow band of 4 - 8"+ of snow fell roughly along and north of the Highway 30 corridor, with the highest axis from near Cedar Rapids to Savanna, IL to Freeport, IL.  

This system was accompanied by very strong "lift" along a tight temperature gradient, and when combined with an unstable air mass, resulted in bands of very heavy snowfall. In fact, the atmosphere was unstable enough to produce lightning and thunder with several reports early Friday morning near and southwest of Cedar Rapids, not too uncommon for late winter or early spring systems! "Thundersnow" is typically associated with higher snowfall rates of 1 - 2"+ per hour and can lead to impressive totals in a short amount of time.

The heaviest snow reduced visibilities to under 1/4 of a mile and quickly led to snow covered and slippery roads, despite mild antecedent conditions with ground temperatures well above freezing.  

NWS Official Totals

Dubuque Airport: 3.4"
Davenport NWS: 0.5"
Moline Airport: 0.1" 

Notable (Non-NWS) Totals

6 SSE Elmoville, IL (Carroll County): 9.3" (CoCoRaHS)
4 SE Loran, IL: 8.5" (Public)
Pearl City, IL: 8.5" (Public)
Shannon, IL: 8.0" (Public)
2 NW Alburnett, IA: 8.0" (Public)
2 WNW Freeport, IL: 7.8" (Trained Spotter)

 

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WPC Sea Level Pressure/Fronts/Radar Loop

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Visible Satellite 03/23/2024
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