1. Weather Briefing May 22, 2013 National Weather Service Detroit/Pontiac, MI http://www.weather.gov/dtx Email: w-dtx.webmaster@noaa.gov w-dtx.webmaster@noaa.gov

2. weather.gov/detroit Hazard Summary Slight Risk Today and Tonight Severe Weather Outlook through Tonight Thunderstorms are expected to develop Today and continue through the early evening. The greatest threat will be damaging winds. However large hail and isolated tornadoes are possible. Best chances along and south of Interstate 94 deeper in the warm sector.

3. weather.gov/detroit Severe Weather Threats Today and Tonight 60 mph or GreaterAround 1” In Diameter Isolated Tornado Threat Damaging Winds Large Hail Tornado

4. weather.gov/detroit Severe Weather Outlook Slight Risk Tomorrow Categorical Severe Weather Outlook Wednesday, May 22 Severe Weather Probabilities

5. Weather Map For Today Highlights Event Summary Slight Chance Of Severe Weather Through Tonight Warm/Moist Unstable Air And Close Proximity To Frontal Boundary Will Trigger Storms Across Southeast Michigan

6. Highlights Slight Chance Of Severe Weather Today and This Evening Warm/Moist Unstable Air And Close Proximity To Frontal Boundary Will Trigger Storms Across Southeast Michigan

7. Decision Support Briefing Highlights Event Summary Forecast for Today (12 hrs) Threat of Severe Weather Friday and into Saturday All of Southeast Michigan

8. Weather Map Tuesday Evening Highlights Better Chance of Severe Weather Due To Closer Position Of Frontal Boundary

9. Weather Map Wednesday Highlights Chance of severe weather exists Wednesday afternoon and evening for portions of southeastern Michigan.

10. Storm System Has History Producing Severe Weather

11. Severe Weather Details This Afternoon Through Tuesday Night weather.gov/detroit What Thunderstorms over Northern Wisconsin and Upper Michigan this morning could impact north of I-96 this afternoon. Little Severe Threat through 4pm Additional storms developing north and moving south after 4pm. Greatest Threat: Damaging Winds Lesser Threat: Large Hail, Tornadoes Localized Flooding Also Possible When Severe Weather is Possible 12pm Wednesday through 8 am Thursday Threat Greatest between 4pm Wednesday and 1am Thursday Where All of Lower Michigan North of Interstate 96 has Best Chance for Severe Weather North of a line from Pentwater to St. John’s - Most Favorable for Isolated Tornado and Heavy Rainfall Forecast Confidence Storms may develop sooner in the afternoon Strongest storms may miss us all together to the south

12. Forecast Challenges And Text too www.weather.gov/detroit Insert image for water vapor, other satellite, Instability Questions, etc. as needed for each event.

13. weather.gov/detroit Hazards Summary Review This Afternoon Through Wednesday Several rounds of showers and thunderstorms will be possible Today and This Evening. Several rounds of showers and thunderstorms will be possible Today and This Evening. The episodic nature of the thunderstorms creates forecasting challenges in regards to timing. The episodic nature of the thunderstorms creates forecasting challenges in regards to timing. Storms this afternoon and evening will be capable of producing damaging wind gusts, large hail, and isolated tornadoes. Storms this afternoon and evening will be capable of producing damaging wind gusts, large hail, and isolated tornadoes. Thunderstorms will also produce locally heavy rainfall. Thunderstorms will also produce locally heavy rainfall.

15. Additional Information NWS Detroit/Pontiac, MI http://www.weather.gov/dtx Email: w-dtx.webmaster@noaa.gov w-dtx.webmaster@noaa.gov Local Hazards Page http://www.weather.gov/detroit/svr.php Storm Prediction Center http://www.spc.noaa.gov