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Thunderstorms can develop extremely quickly which leaves the City of Plano with little time to produce warnings. Thunderstorms bring many things with them: heavy winds, lightning, and heavy rains which in combination have the ability to knock out power for extended periods of time, uproot trees, and cause flash flooding which can also break utility lines. Vital Weather Codes: •    Tornado Watch- Conditions are conducive to the development of tornadoes in and close to the watch area. •    Tornado Warning- A tornado has actually been sighted by spotters or indicated on radar and is occurring or imminent in the warning area. •    Severe Thunderstorm Watch- Conditions are conducive to the development of severe thunderstorms in and close to the watch area. •    Severe Thunderstorm Warning- A severe thunderstorm has actually been observed by spotters or indicated on radar, and is occurring or imminent in the warning area. During the storm:     * During heavy lightning; avoid anything metal as electricity can travel through bathtubs, sinks, electrical equipment, etc.     * Never take shelter underneath trees, but do try to get shelter if you are outside as soon as possible.     * Listen to local TV/radio channels for emergency advisories and instructions     * If water has seeped into your home; try and avoid it as it may have hazardous materials in it.     * Always disconnect all electrical appliances during an evacuation     * Call (972) 424-5678 to report fallen trees or tree limbs, or clogged catch basins     * Call (972) 424-5678 to report flooded streets After the storm:     * Take inventory of what is damaged, salvable, and amount of work that needs to be done.     * Report fallen trees, flooded streets or damaged public utilities to proper department