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 Thu Apr 10 13:36:01 UTC 2025No watches are valid as of Thu Apr 10 13:36:01 UTC 2025. |
SPC - No MDs are in effect as of Thu Apr 10 13:36:01 UTC 2025No Mesoscale Discussions are in effect as of Thu Apr 10 13:36:01 UTC 2025. |
SPC Apr 10, 2025 1300 UTC Day 1 Convective OutlookSPC 1300Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK0746 AM CDT Thu Apr 10 2025Valid 101300Z - 111200Z...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM PORTIONS OFTHE LOWER OH VALLEY INTO THE DEEP SOUTH......SUMMARY...Scattered strong-severe thunderstorms are expected from portions ofthe lower Ohio Valley into the Deep South this afternoon. Hail andwind are the primary concerns....Synopsis...Broad upper troughing is forecast to shift eastward across theeastern CONUS today, as a series of embedded shortwave troughprogress through its base. The lead wave in this series is currentlymoving through Lower/Middle OH Valley with a second wave fartherback northwest across the Upper Midwest/Mid MO Valley. This secondwave, which is accompanied by an 80 kt 500 mb jet streak, isexpected to continue southeastward throughout the day, reaching theMid-South vicinity by this evening before continuing more eastwardinto southern Appalachians by early Friday. Surface pattern preceding this upper troughing will be somewhatdisorganized and broad, with one weak low moving northeastwardacross the Upper OH Valley and another moving southeastward acrossthe Mid MS Valley and KY/TN. A diffuse cold front is forecast toshift southeastward across the OH Valley into the Mid-South andeventually the Southeast. Strong to severe thunderstorms areanticipated in the vicinity of this front throughout the afternoonand evening. ...Mid-South/TN and OH Valleys into the Southeast...Area soundings reveal the steep mid-level lapse rates (i.e. greaterthan 7 deg C per km) extend throughout much of the region, supportedby a large area of cold mid-level temperatures (-18 to -24 deg C at500 mb). These cold mid-level temperatures will help support airmassdestabilization and modest buoyancy ahead of the approachingshortwave trough and cold front, despite relatively modest low-levelmoisture. Forcing for ascent along the front, as well as more broadlarge-scale ascent, will interact with this destabilized airmass tosupport thunderstorm development across much of the region thisafternoon. Thunderstorm coverage will likely be maximized along thefront, but initiation could also occur elsewhere across the regiongiven the broad ascent and large destabilized area. Deep mixing is anticipated across the region, resulting in athermodynamic profile that is somewhat unique for this part of thecountry. This profile will result in high-based thunderstormscapable of producing strong cold pools, particularly given thatshear is quite strong and updraft organization is likely. Primaryfactor precluding greater severe potential is the limited low-levelmoisture and resulting modest buoyancy. That being said, the longhodographs suggest storms could be efficient at producing hailduring their initially more discrete stage, with a trend towardscold pool amalgamation thereafter. Consequently, several bowingsegments could develop, each with the potential to produce damaginggusts...Mosier/Kerr.. 04/10/2025Read more |
