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This is your launching point for nowcasting and forecasting.

Day 1 Convective Outlook
Day 1 Convective Outlook
Day 2 Convective Outlook
Day 2 Convective Outlook
Day 3 Convective Outlook
Day 3 Convective Outlook
Days 4-8 Convective Outlook
Days 4-8 Convective Outlook
Current Mesoscale Discussions
Mesoscale Discussions
Current Watch Boxes
Watches
Recommended:           Computer Models: Good for Precipitation Good for Temperatures
  •              5km BAMS 36hr
  •           SPC's SSEO (hires mutimodel prob) | UHEL 36hr
  •       10km RGEM Tidbits 48hr
  •           3.6km WRF NMM Tidbits | MAG 48hr
  •           4.2 km WRF ARW Tidbits | MAG 48hr
  •       4km NAM Tidbits | MAG 60hr
  •           12km RPM 72hr $$$
  •          NAM MOS 72hr

For more forecast tools we recommend F5Data.