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2017 Severe Thread


mappy

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1 hour ago, Ellinwood said:

Friday looks alright. Decent setup for isolated wind damage. Probably not that organized. Need as much sun as possible to bump up the MLCAPE.

We do pulse storms pretty often around here. Good for a small area and then meh elsewhere. Pretty much what I'm expecting. 

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3 minutes ago, Kmlwx said:

Slight risk remains in place for tomorrow. LWX radar is back up but not calibrated yet. 

Still sticking with my thoughts from yesterday - no widespread severe. Just the usual stuff. 

debris clouds from storms over PA will drift S providing clouds most of tomorrow morning capping things until 12:08pm.  At that point we all make 50 'I see blue sky' posts and barely get 1500 CAPE.  Storms fire up over Frederick, MD down to Winchester.  As they move in EJ makes posts about seabreeze boundaries killing outflows. A cell sups over Columbia and Fredricksburg and I get sweet texts from a friend down that way while tumbleweeds blow across my front yard as the DC split happens.  

 

4 severe warning boxes go up in total

 

The usual

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That sounds eerily close to what will probably happen. And somebody will post an awesome structure shot at some point too. More losers than winners...but when is that not the cast with severe and us. I hope our tropical peak brings something exciting. I'm over here twiddling my thumbs every day WRT weather.

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1 hour ago, Kmlwx said:

That sounds eerily close to what will probably happen. And somebody will post an awesome structure shot at some point too. More losers than winners...but when is that not the cast with severe and us. I hope our tropical peak brings something exciting. I'm over here twiddling my thumbs every day WRT weather.

Over the Bay.

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HRRR is looking pretty weak. Last 3 or 4 runs have been pretty consistent showing just a couple popcorn cells around DC @ 19z but nothing else for the most part. With this type of day, meso models are just throwing darts until something actually starts to fire though so I don't think the weak stuff the hrrr is showing is all that useful. OTOH- it wouldn't surprise me if 90% of us don't even hear thunder or get the sidewalk wet. 

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Mesoscale Discussion 1305
   NWS Storm Prediction Center Norman OK
   0203 PM CDT Thu Jul 13 2017

   Areas affected...northern and central VA...eastern half of MD...and
   DE

   Concerning...Severe potential...Watch possible 

   Valid 131903Z - 132000Z

   Probability of Watch Issuance...40 percent

   SUMMARY...Scattered thunderstorms will likely continue to develop
   and intensify this afternoon.  Isolated 50-60 mph gusts capable of
   wind damage are possible.  A severe thunderstorm watch may need to
   be considered over the next hour or two.

   DISCUSSION...Visible satellite imagery shows a bubbling cumulus
   field across the Chesapeake Bay vicinity and storms have recently
   formed near the Shenandoah Valley.  The airmass continues to
   destabilize with temperatures slowly rising into the lower-middle
   90s degrees F with lower 70s dewpoints.  

   The 16Z IAD raob modified for early-mid afternoon surface conditions
   yields around 3000 J/kg SBCAPE with a 0-3km lapse rate around 8.5
   degrees C/km.  The 16Z raob sampled relatively weak to moderate
   westerly flow (up to 35 kt at 650 mb).  The KLWX VAD as of 1850Z has
   observed a strengthening in the mid-level flow field (30-45 kt in
   the 5-9 km layer).  Given the moist boundary layer and stronger mid
   level flow on the southern periphery of a MCV traversing across PA,
   there appears to be greater potential for organized multicells than
   previously thought.  At least a couple of stronger downdrafts
   yielding a risk for damaging winds are possible.  Convective trends
   will be monitored for the possible need for a severe thunderstorm
   watch.

   ..Smith/Darrow.. 07/13/2017

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...PHI...AKQ...LWX...
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