Arctic Air for the Northeast and Mid-Atlantic; Increase Moisture for Pacific Northwest; Active Pattern for Hawaii

An arctic cold front will impact the Great Lakes, Northeast and mid-Atlantic. Snow showers and squalls will accompany this system with increasing winds and falling temperatures. Damaging wind gusts may result in tree damage and power outages. Meanwhile, moisture returns for the Pacific Northwest and Hawaii this weekend with both coverage and intensity of rainfall and higher elevation snows. Read More >

Overview

A line of showers and thunderstorms developed across from central Iowa south to central Missouri Monday afternoon ahead of a strong cold front. This line of storms slowly progressed eastward, reaching eastern Iowa and northeast Missouri Monday evening.

Some thunderstorms in the line became severe, producing damaging winds, large hail up to quarter size, and one confirmed tornado across southeast Iowa and northeast Missouri.

Radar Animation (3:55 P.M. - 8:00 P.M.) (IEM) (Click to zoom)

Tornado
Photos & Video
Storm Reports
Environment

Tornadoes:

Tornado - Wayland, MO
CLARK COUNTY MO into LEE COUNTY IA

Date	12/04/2017
Time (Local)	513 PM - 528 PM
EF Rating	EF-2
Est. Peak Winds	115 MPH
Path Length	8.87 miles
Max Width	50 yds
Injuries/Deaths	1/0
Summary: A tornado touched down in an open field southwest of Wayland, MO. This tornado did damage mainly to trees and did break a couple of windows near where it touched down. This tornado moved east/northeast across mainly rural areas. As it approached Highway 27, it strengthened and caused EF-2 damage to power poles. The tornado then hit a DOT facility, destroying large doors and a salt shelter. As it crossed the highway, it overturned a semi, causing one injury. The tornado then crossed the Des Moines River into Iowa where it soon lifted. Peak winds were estimated at 115 mph.

Track Map

(Click to zoom)

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

Photos & Video:

Header


Snapped power poles next to HWY 27 (NWS Storm Survey)	Tree Damage next to HWY 27 (NWS Storm Survey)	Destroyed DOT Salt Shelter (courtesy KHQA)	Overturned Semi on HWY 27 (courtesy KHQA)

Storm Reports

Environment

Additional environmental data.


Figure 1: SPC Day 1 Outlook (20:00 UTC)	Figure 2: SPC Day 1 Tornado Outlook (20:00 UTC)	Figure 3: SPC Day 1 Hail Outlook (20:00 UTC)


Figure 4: SPC Day 1 Wind Outlook (20:00 UTC)

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Arctic Air for the Northeast and Mid-Atlantic; Increase Moisture for Pacific Northwest; Active Pattern for Hawaii

Severe Thunderstorms: December 4th, 2017