NWS Tornado Warning Program Tornado Warnings: How the National Weather Service Tracks and Warns The Public Congressional Hazards Caucus Alliance April.

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Presentation transcript:

NWS Tornado Warning Program Tornado Warnings: How the National Weather Service Tracks and Warns The Public Congressional Hazards Caucus Alliance April 5, 2006 Mark Tew Office of Climate, Water, and Weather Services NOAA’s National Weather Service

NWS Tornado Warning Program NWS Mission Congressional Organic Act of 1890 To provide public weather forecasts and warnings for the protection of life and property and to provide weather information for the Nation’s economic well-being

Comparison of Tornado Events NWS Tornado Warning Program

Tornado Products Multi-Tiered Concept Convective Outlook Potential exists for a severe weather event in the next 1 to 3 days Tornado Watch Conditions are favorable for a tornado event in the next 6 hours Tornado Warning Issued when a tornado has been sighted by weather spotter or indicated by weather radar Indicates imminent danger to life and property.

NWS Tornado Warning Program Overview of Warning Process

NWS Tornado Warning Program Radar Detection

NWS Tornado Warning Program Role of Amateur Radio and Weather Spotters

NWS Tornado Warning Program Tornado Warning Bulletin BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE NORMAN OK 610 PM CDT WED OCT THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * TORNADO WARNING FOR... WOODS COUNTY IN NORTHWEST OKLAHOMA * UNTIL 710 PM CDT * AT 610 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND WEATHER SPOTTERS INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES SOUTHWEST OF FREEDOM...MOVING EAST AT 35 MPH. * LOCATIONS IN THE WARNING INCLUDE AVARD AND FREEDOM. A TORNADO MAY FORM AT ANYTIME. TAKE COVER NOW. ABANDON MOBILE HOMES AND VEHICLES. IF POSSIBLE... MOVE TO A BASEMENT OR STORM SHELTER. OTHERWISE... MOVE TO AN INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS. THIS STORM WILL ALSO PRODUCE DAMAGING HAIL AND DAMAGING WINDS. LAT...LON

NWS Tornado Warning Program Warning Dissemination Tornado Warnings disseminated directly to NOAA Weather Radio Private weather vendors Emergency Managers Broadcast Media Warning information is available via Media broadcasts weather radios cell phones PDAs

NWS Tornado Warning Program Tornado Warning Performance for FY05 Lead Time = 13 minutes More than doubled since 1993 (6 minutes) Time difference between warning issuance and report of tornado Accuracy = 75% 83% improvement since 1993 (41%) How often a tornado occurred during the valid time of a tornado warning False Alarm Rate = 78% How often a warning was issued without receiving an actual tornado report from a reliable spotter

Polygon Eliminates False Alarm for this Area Goal – Improving Warning Service NWS Tornado Warning Program

National Weather Service warning and forecast information: Any Questions or comments?