by Heidi Adams Cool
A concise clear how-to, the best I've found.
My recommended follow-up -
Using an 'onclick' event to dynamically load a SWF
Saturday, December 5, 2009
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SPC - No watches are valid as of Fri Apr 11 13:34:02 UTC 2025No watches are valid as of Fri Apr 11 13:34:02 UTC 2025. |
SPC - No MDs are in effect as of Fri Apr 11 13:34:02 UTC 2025No Mesoscale Discussions are in effect as of Fri Apr 11 13:34:02 UTC 2025. |
SPC Apr 11, 2025 1300 UTC Day 1 Convective OutlookSPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK0738 AM CDT Fri Apr 11 2025Valid 111300Z - 121200Z...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THISAFTERNOON/EVENING FROM NORTH FLORIDA TO EASTERN NORTH CAROLINA ANDEXTREME SOUTHEAST VIRGINIA......SUMMARY...Isolated strong to locally severe thunderstorms are possible fromthe eastern Carolinas into southeast Virginia and across farsoutheast Georgia and northern Florida....North FL to eastern NC this afternoon/evening...A midlevel trough is in the process of amplifying over the southernAppalachians as one embedded speed max rotates northeastward overthe Carolinas today, and an upstream speed max digs southeastwardfrom the mid MS Valley to the Southeast. An associated surfacecyclone will develop northeastward across the eastern Carolinastoday, while a trailing cold front moves southeastward into northFL. Boundary-layer dewpoints in the low-mid 50s, in combinationwith surface heating beneath cold (less than -20 C at 500 mb)midlevel temperatures, will result in MLCAPE near 500 J/kg withminimal convective inhibition. Scattered thunderstorms are expectedto form this afternoon near the cyclone track across the easternCarolinas and along the front in north FL. The weak buoyancy andrelatively straight hodographs suggest some storm organization willbe possible with a low-end threat for hail and strong outflow windsfor a few hours this afternoon/evening. A few low-topped thunderstorms are also expected this afternoon overthe southern Appalachians. However, buoyancy and vertical shearwill be weaker compared to areas farther east and southeast, andonly sub-severe hail/wind is expected...Thompson/Dean.. 04/11/2025Read more |
