 It is not unusual in the winter for schools in the surrounding areas to be 2 hours late, while the Hereford Zone is closed due to inclement weather.Near the most northern part of the zone in the topmost strip where Baltimore County meets south central Pennsylvania, numerous mini tornadoes and wind storms zip through the fields unfettered by buildings or natural land changes to halt their progress.The air quality in the area is markedly different from that of the suburbs of Baltimore City to the south.