What triggers a tornado siren?

Is the pressure in the air? We had our alarm time go twice tonight for a few minutes each time. We are not having serious time. Not even rain. We are under a tornado warning and severe weather is on its way. ** I meant time siren. The community.

Weather sirens are activated manually by people. If not confirmed tornado touchdowns or confirmed the existence of funnel clouds, then the siren started. At times, the siren will be tested when there is severe weather to make sure it works correctly.

Oregon Scientific™NOAA Emergency Weather Radio and Alarm…

WR-120 Weather Alert Trillingual Radio w/Alarm Clock $34.82 Midland WR-120 Weather Alert Trillingual Radio w/Alarm Clock

Oregon Scientific HandHeld Weather Forcaster With Alarm Clock EB313HGA $35.96 Oregon Scientific HandHeld Weather Forcaster With Alarm Clock EB313HGA

Oregon Scientific EB313HG HandHeld Weather Forecaster w/Alarm Clock $22.25 Oregon Scientific EB313HG HandHeld Weather Forecaster w/Alarm Clock

Weather Trend Weather Station $39.94 Weather Trend Weather Station 645-624 Weather TrendVertical weather station/alarm clock with a brushed silver finished metal front with white trim offers many functions. The LCD displays the current weather trend, the indoor temperature in F or C, and relative humidity with maximum and minimum memory. The alarm clock features 12- or 24-hour selectable time format and snooze alarm. The calendar function displays the month, date, day of the week, and moon phase. Quartz, alarm movement includes the battery. Dimensions:H. 6-1/4" (16 cm)W. 2-1/4" (6 cm)D. 1-1/2" (4 cm)

Midland WR-120 Weather Alert Trillingual Radio w/Alarm Clock $35.94 Midland WR-120 Weather Alert Trillingual Radio w/Alarm Clock WR-120 Weather Alert RadioHighlights: Automatically Responds to National Weather Service Alerts Large Easy to Ready Display Battery Back-upFeatures: SAME Localized Reception Continuous Backlighting Option- Keeps the LCD on 25 Programmable Counties Color coded Alert Indicators Alert Override automatically switches over to warn you of impending danger Alarm Clock with Snooze Silent programming Single, Multiple, or Any S.A.M.E program settings User Selectable Warning System -Voice, Display, or Tone alert types 10 reviewable alerts 7 preset weather channels Public alert certified Receives over 60 Alerts Uses 3AA Alkalinefor emergency power back-up All Hazards Alert – in addition to important weather announcements your radio will aso receive other emergency announcement such as: Child Abduction Emergency (Amber Alert) Nuclear Power Plant Warning Biological Hazard Warning Civil Emergency Message Fire Warning Landslide Warning

Oregon Scientific +ECO Solar Powered Wireless Weather Forecaster w/Alarm Clock & 3-Channel Remote Sensor (White/Green) $31.77 Oregon Scientific +ECO Solar Powered Wireless Weather Forecaster w/Alarm Clock & 3-Channel Remote Sensor (White/Green)

Professional Weather Center $192 -Weather forecasting function with 3 weather icons and weather tendency indicator -Wireless OUT temperature (�F/�C) humidity (%RH) -MIN / MAX value of OUT temperature humidity display with time date of recording -Monitors IN temperature (�F/�C) -HI / LOW OUT temperature humidity alarm -Wireless self-emptying rain bucket Total rainfall (inches or mm) -24 Hour rainfall with time of MAX record -Air pressure tendency indicator for the past 12 hours (bar graph format) -Wind direction, wind speed (mph, km/h or M/S, beaufort scale) wind chill (�F/�C) -Max wind speed with time of recording -High alarm function for wind speed -Dew point with MIN / MAX with time date Storm warning alarm -Storage of 140 sets of history weather data -12 / 24 Hour time display with alarm function -Calendar display (weekday, date, month, year)

Radio Controlled Projection Alarm Clock with Temperature Display $79.99 Radio controlled alarm clock with weather forecast. Projects current time as well as Ferrari logo onto the wall or ceiling of a darkened room. Indoor and 3-channel outdoor temperature display.

The Weather Channel Professional Center (DS) $119.99 The Weather Channel Professional Weather Center WS-1611TWC-IT. This Professional Weather Center tells you everything you want to know about your outdoor weather! Wireless Thermo-Hygro Sensor transmits your wind, rain, temperature & humidity information within seconds to the base unit and will store up to 200 sets of Weather Data recorded within 3 hour intervals. This unit is full of features: Wind Direction & Speed, Wind Chill, Total Rainfall, MIN/MAX values for Out Temp & Humidity & Wind, Pressure History Graph and Weather Forecast. It’s several weather alarm features, including a storm warning alarm, will help you be prepared for whatever the weather can bring! Manual Set 12/24 Hour Time display with Calendar. Click on Alternate View to see additional details. This is a Special Order item shipped directly from the manufacturer and may take up to 10 days for delivery. This product is available online only.

iMM183 Hi-Fi Dual Alarm Clock Radio w/ NOAA/ S.A.M.E. Weather Hazard Alert $89.99 Features two docks for your iPhone and/or iPod as well as weather band forecasts / warnings. Digital SAME Technology provides localized weather warnings. Large display; easy to read. Supports NOAA emergency alert system.

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