Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >
Overview
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Scattered showers and thunderstorms developed across much of eastern IA, northwest IL and northeast MO on the afternoon and evening of October 9th. This was due to a strong cold front and associated low pressure system advancing eastward across west central IA. Several supercells developed, with one producing a confirmed tornado near Blairstown, IA in Benton county. Other storms produced hail up to penny size, locally heavy rainfall, and brief funnel clouds.
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 Radar Image: Tuesday 10/9 5:00 pm |
Tornado:
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1 SE Blairstown, Iowa
Track Map
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Rain Reports
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Local Rainfall Map
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Regional Estimated Rainfall
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Environment
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| Figure 1: SPC Day 1 Outlook (200z) | Figure 2: SPC Day 1 Tornado Outlook (200z) | Figure 3: SPC Day 1 Wind Outlook (2000z) | Figure 4: SPC Day 1 Hail Outlook (2000z) |
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| Figure 5: DVN Sounding 10/9/18 12z | Figure 6: DVN Sounding 10/10/18 00z |
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| Figure 7: SPC Mesoscale Discussion #1550 (see link for details) | Figure 8: SPC Mesoscale Discussion #1553 (see link for details) | Figure 9: SPC Mesoscale Discussion #1555 (see link for details) |
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