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WEATHER MAPS

STORM PREDICTION CENTER

   
DAY 1 OUTLOOK DAY 2 OUTLOOK DAY 3 OUTLOOK DAY 4-8 OUTLOOK

This is today's forecast for organized severe thunderstorms over the contiguous United States. Please read the description of the risk categories for further information. You may find the latest Day 1 Outlook available as well as all Outlooks issued today online.

This is tomorrow's forecast for organized severe thunderstorms over the contiguous United States. Please read the description of the risk categories for further information. The latest Day 2 Outlook is available as well as all Outlooks that have been issued today. This is the day after tomorrow's (day 3) forecast for organized severe thunderstorms over the contiguous United States. Please read the description of the risk categories for further information. The latest Day 3 Outlook is available as well as all Outlooks that have been issued today. This is the day 4-8 forecast for organized severe thunderstorms over the contiguous United States. The latest Day 4-8 Outlook is available as well as all Outlooks that have been issued today. Note: A severe weather area depicted in the Day 4-8 period indicates a 30% or higher probability for severe thunderstorms (e.g. a 30% chance that a severe thunderstorm will occur within 25 miles of any point).
MESOSCALE DISCUSSIONS WATCHES, WARNINGS, ADVISORIES STORM REPORTS CURRENT WATCHES
This is the current graphic showing any mesoscale discussions (MD's) which are in effect over the contiguous United States. Please read the description of the purpose of our MD's for further information. Details on all valid MD's may be found on our Current Mesoscale Discussions page. Current watches, warnings and advisories issued by the agencies of the National Weather Service. Today's storm reports. (Updated every 10 minutes) This is the current graphic showing any severe thunderstorm and tornado watches which are in effect over the contiguous United States. Please read about the the purpose of our watches for further information. Details on all valid watches may be found on our Current Convective Watches page.

UNISYS WEATHER

   

IR SATELLITE

RADAR SUMMARY US LOOP    
   
This type of image shows heat based radiation from the infrared spectrum. In other words, the warmer the surface, the more infrared radiation it emits. For a satellite image, cooler surfaces are bright and warmer surfaces are dark. Since the atmosphere cools as you increase in altitude, clouds would show up as bright areas and land surfaces as dark areas. In addition, low clouds will be more gray and higher clouds will show up more white. Tall thunderstorm clouds will show up as bright white and fog will be hard to discern from land areas. A large advantage of IR is that you can view it 24 hours a day. This is a composite plot of the radar summary, echo tops, storm movement, TVS and MESO signatures and watch boxes. The radar summary is color coded by precip type. Greens, yellows and reds are rain. Pinks are mixed precipitation (freezing rain, sleet). Blues are snow. NOTE: Radar data is susceptible to a phenomena called anomalous propagation. This generally happens at night and appears as a area of 20 dBZ echos (darkest green) which is centered around each radar site and expands with time. To try and reduce the problem, low echo values near the radar sites have been removed.