Situation Report Wednesday, July 11, 2018 3:55 PM

National Weather Service

Duluth, MN

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Severe Storm Risk Headline

Headline

Headline

Summarize the threat in one or two bullets

• Severe thunderstorms are possible late this afternoon through tonight.

• Heavy rain may lead to flash flooding, particularly in the Moderate Risk area of the Flash Flood Risk map above.

Flash flooding risk has increased since this morning, especially in the area shaded in red on the Flash Flood Risk map above.

Weather Message of the Day:

Important Forecast Changes

Severe Storms and Flash Flooding Possible

Use banner color that matches risk level

Marginal

Slight

Marginal

Marginal

Slight

Flash Flood Risk

Moderate

Situation Report Wednesday, July 11, 2018 3:55 PM

National Weather Service

Duluth, MN

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This page is required in order to address these critical elements: 1. Hazards 2. Areas Impacted 3. Timing & Duration 4. Impacts 5. Forecast Certainty and Considerations 6. Historical Perspective (how rare is this event?) is recommended to include especially in larger events. However, this format may be modified and offices may use graphics/other text (encompassing other slides if needed) as they see fit or as requested by local partner feedback to address these critical elements.

Key Points

Impacts: Hail damage to roofs, vehicles, siding, and windows is

possible. Flash flooding may cause road closures and washouts.

Strong winds may break large tree branches, topple, and break

trees, and cause roof damage.

Timing & Duration: Thunderstorms are expected to redevelop this

afternoon or evening along an approaching cool front and move east

to southeast tonight. The flood risk is highest this evening and

overnight.

Areas Impacted: All of northern Minnesota and northwest

Wisconsin. Greatest risk is over central and north-central Minnesota.

Hazards: Some thunderstorms may produce large hail, some

stones larger than golfballs, and damaging wind gusts. Tornadoes

are also possible. Heavy rainfall is likely with these storms and may

lead to flash flooding, especially late this evening and overnight.

The following are examples of phrases you could use for each point Hazards Strong to severe thunderstorms Severe thunderstorms Impacts Some storms could produce small hail and gusty winds Some storms will produce large hail and damaging winds Dangerous storms producing large hail and damaging winds Damaging winds may lead to numerous trees down and power outages Timing Storms will develop mid to late in the afternoon and move east into the evening. Storms will track into the Northland overnight tonight. Certainty We are confident storms will develop, but not all storms will be severe. While we are not confident that storms may develop, if they DO develop they will quickly become dangerous.

Large Hail

Larger than 1 inch likely

Golfball-size possible

Damaging Winds

Gusts over 60 mph

Tornadoes

Possible

Flash Flooding

Flash Flood Watch in Effect

Flash flooding possible

Situation Report Wednesday, July 11, 2018 3:55 PM

National Weather Service

Duluth, MN

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Flash Flood Watch

Image: Day 3 Excessive Rainfall

Backup Images:

Marginal 1

2

4

5

Slight

Moderate

High

A Flash Flood Watch has been issued for the areas shaded in green above. This watch includes the following areas in Minnesota: International Falls, Ely, Hibbing, Virginia, the Boundary Waters Canoe Area Wilderness, Two Harbors, Duluth, Grand Rapids, Brainerd, Aitkin, McGregor, Cloquet, Moose Lake, and Hinckley. In Wisconsin: Superior, Solon Springs, Brule, Bayfield, Clam Lake, Siren, and Grantsburg. Heavy rainfall is expected with the storms and the risk of flash flooding increases through the evening and continues overnight.

Situation Report Wednesday, July 11, 2018 3:55 PM

National Weather Service

Duluth, MN

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Select Appropriate Info Box from the right. Feel free to modify or make new info boxes depending on the weather threat.

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This page is required Info Boxes:

Weather Message of the Day:

Thunderstorms are forecast to develop late this afternoon or early this evening.

Some storms may be severe with large hail and damaging wind gusts the main

threats. Tornadoes are also possible. Heavy rainfall is likely and may lead to flash

flooding. Keep an eye on the sky and stay up to date with the latest forecasts and

possible watches and warnings.

@NWSDuluth US National Weather Service Duluth MN

For more information visit: http://www.weather.gov/duluth

Please share your reports by calling or through social media:

218-729-6697 facebook.com/NWSDuluth @NWSDuluth

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Water over roads, etc.

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WATCH WARNING

Conditions are favorable for

dangerous storms

Threat is imminent. Take shelter NOW!

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head for safe harbor if on the

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