The National Weather Service is expected to be in northwest parts of Trumbull County Friday, surveying damage after reports of a tornado in nearby Geauga County. In addition, they're already sharing warnings about the potential for damaging storms on Friday evening. 

Late Thursday afternoon a tornado warning was issued for Geauga County, as well portions of Trumbull County. 

The storm's rotation prompted concerns, and there were reports of a tornado touchdown in Middlefield. In Trumbull County sirens blared and several school districts postponed dismissal until after the warning expired at 4:15 p.m. Thursday. 

Several reports of tree damage and power lines downed came into the newsroom from areas of West Farmington. 

The Cleveland Office of the National Weather Service visited areas of Middlefield in Geauga County, as well as West Farmington, on Friday. 

Late Friday morning the National Weather Service confirmed that two F1 tornadoes touched down in Geauga County, one of those carried into Trumbull County, leaving damage in West Farmington. 

However, the National Weather Service is already sharing warnings about the risk for more severe weather Friday afternoon and into the evening. 

Chris Cerenelli, of the StormTracker 21 Weather Team, says a broken line of storms, will be spurred on by a strong cold front, pushing them into the area. 

Cerenelli says the storms will impact the entire Mahoning Valley, pushing through between 5 p.m. and 8:30 p.m.

According to the latest forecast, the largest threat to the area will be damaging winds. Cerenelli said wind gusts are expected to be sixty miles per hour or higher at some times. 

The National Weather Service says winds of that magnitude can break off large branches, knock over trees, or cause structural damage to trees. 

In addition, Cerenelli said there is a "low-end" risk that the storms could produce tornados. Cerenelli said that the risk is low, however, it is enough of a risk to be weather aware. 

In addition, the Valley should expect the line of storms to spread rain around the area, as well as produce some quick torrential downpours. 

Cerenelli explained that the humidity in the air will contribute to the ability of the storms to produce a lot of rain in a short amount of time. 

Although flooding is not a major concern, Cerenelli said the NWS may issue some flash flood warnings for the area if they are needed. 

Cerenelli also explained that those attending Friday night football games should expect lightning delays. Frequent cloud to ground lightning will prompt high school football games to either come to a halt or be pushed back. 

The Ohio High School Athletic Association says all schools and teams must follow the "Thirty Minute Rule". 

That policy is outlined by the OHSAA as: 

Thirty-Minute Rule – Competition or practice shall be suspended once lightning has been recognized or thunder is heard. It is required to wait at least 30 minutes after the last flash of lightning is witnessed or thunder is heard prior to resuming practice or competition. Given the average rates of thunderstorm travel, the storm should move 10-12 miles away from the area. This significantly reduces the risk of local lightning flashes. Any subsequent lightning or thunder after the beginning of the 30-minute count shall reset the clock, and another count shall begin.

Chief Meteorologist Eric Wilhelm explained in an in-depth video blog online that the National Weather Service categorizing the Valley as an "enhanced risk" for severe weather happens only a few times a year. 

With the incoming storms, the NWS suggests that there is the possibility that some breakout storms could produce tornadoes. 

In that event, a tornado watch or tornado warning could be issued. 

The National Weather Service explains the difference: 
A Tornado Watch means "conditions are favorable for the development of severe thunderstorms and tornadoes in and close to the watch area. A watch is normally issued for a large area covering numerous counties. The watch is intended to give you time to review your safety rules. The sky may be sunny, but weather changes can take place quite rapidly."

A Tornado Warning means "a developing tornado has been detected by National Weather Service Doppler Radar or has been reported on the ground by reliable sources. A Tornado Warning is typically issued for a portion of counties at a time and usually lasts no more than 45 minutes. If a Tornado Warning is issued for your county, you should seek shelter immediately. If you see a tornado or feel threatened, move to a safe place immediately, as precious seconds can save your life." 

In addition, the NWS offers the following tornado safety tips: 

If you are in a home or small business:
Go to the basement or a small interior room such as a closet, bathroom or interior hallway without windows on the lowest level. Put as many walls between yourself and the outside as possible. If possible, get under something sturdy, such as a heavy table, or use a mattress to protect yourself from flying debris. Most injuries associated with high winds are from flying debris, so remember to protect your head. If available, put on a bicycle or motorcycle helmet to protect yourself from head injuries.

If you are in a large business, school, hospital, shopping center or factory:
Go to the designated shelter area. If a shelter area is not available, the best place is to go to an interior hallway on the lowest level. Stay away from the structurally weaker portions of buildings, such as windows and rooms with expansive roofs, which are more likely to collapse when tornadoes strike. 

If you are in a mobile home or home on stilts:
Get out and take shelter in a sturdy building or storm shelter. If there is not one nearby, take shelter in the most interior room that has no windows, such as an interior bathroom or closet. 

If you are caught in a vehicle:
Get out and into a sturdy shelter. If one is not available nearby, get to a low spot and cover your head from flying debris. Do not take cover under an overpass as this does not provide adequate shelter during a tornado and can cause increased wind speeds due to a tunneling effect.

Do not waste time opening windows in an attempt to prevent damage to a building. The old belief that damage could result from rapid pressure changes during a tornado is NOT TRUE. It will not make any difference in a tornado if the window is open or not.

Your safest course of action is to take shelter immediately when a tornado warning is issued for your area.

In any event, meteorologists suggest everyone stay weather aware onFridayy. To keep up to date on the quick moving storm, you can download the StormTracker 21 weather app free for download on your smartphone, follow StormTracker 21 on Facebook or Twitter, and stay up to date on wfmj.com

This is a developing story. Check back to wfmj.com for updates.