Four Things to Know About the Severe Weather Threat This Week

Linda Lam
Published: April 18, 2019

A multi-day severe thunderstorm threat will continue to spread eastward across parts of the South and East through Friday.

Dangerous storms are expected, but this latest severe threat will be different than last weekend's deadly outbreak.

(MORE: Tornado Central

Here are four things to know about this latest severe weather threat.

1. Severe Thunderstorm Threat Continues Overnight

The chance for damaging winds, hail and tornadoes may continue across parts of the South and Ohio Valley Thursday night into early Friday as severe thunderstorms track toward the East Coast.

Thunderstorm Timing

Tornadoes at night are more than twice as likely to be deadly as those during the day. Nighttime tornadoes are harder to see, so they are more difficult to confirm. People may be asleep and not receive warnings. And more people are home, which is often more vulnerable than their workplace.

It's important to make sure you have a way of receiving severe weather warnings even when you are sleeping and to know where your safe place is overnight.

2. Damaging Winds and Tornadoes are Potential Threats

A squall line of thunderstorms with damaging winds and perhaps some tornadoes is expected to move eastward across parts of the Southeast and mid-Atlantic on Friday.

Friday's Severe Thunderstorm Forecast

Although tornadoes get the most attention, damaging wind gusts and large hail are also major threats and can cause substantial damage to homes and vehicles and can injure people.

(MORE: Why You Shouldn't Ignore Severe Thunderstorm Warnings

3. Flash Flooding Will Also Be a Threat

A widespread area of 1 to 3 inches of rainfall will stretch from the Southeast to the Ohio Valley, mid-Atlantic and Northeast. Locally heavier rainfall is likely in some locations.

Portions of eastern Texas, northern Louisiana and southern Arkansas experienced flash flooding last weekend, and any additional moderate to heavy rainfall over a short period of time could cause flash flooding there once again.

Flood watches have been issued by the National Weather Service from the lower Mississippi Valley to the Ohio Valley. Watches have also been posted for parts of the Northeast.

Rainfall Forecast

The soil moisture in these areas remains well above average for this time of year. Saturated ground, combined with more rainfall, will increase the risk of flooding.

A slight risk of excessive rainfall has been issued from parts of the Southeast into the Northeast on Friday. Some flash flooding could occur, and it may also lead to rises on rivers.

4. Temperature Drop Behind This System

There is often a battle between warm and cold temperatures in the spring, and that will be the case this week.

Ahead of this low-pressure system, warmer temperatures will surge northward. High and low temperatures will be 10 to 25 degrees above average for mid-April, with highs in the 70s reaching into parts of the Midwest and Northeast and 80s in the South.

Forecast Highs

Behind the cold front, temperatures will drop back to near or below average. In many locations, temperatures will be 10 to 30 degrees cooler.

(MAPS: 10-Day Forecast

The coolest temperatures compared to average will be found in parts of the South and Ohio Valley Friday and Saturday, when high and low temperatures will be 10 to 20 degrees below average.

Highs will top out in the 40s and 50s in the Midwest, with 50s and 60s in much of the South. Morning lows in the 40s will reach as far south as the Florida Panhandle this weekend.

Temperatures will begin to rebound early next week.

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