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4/29 & 4/30 Obs: Thunderstorms & Then The Howling Winds


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Slight risk was dropped with morning update.

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...East TX to Mid-Atlantic...
   Isolated strong-severe thunderstorms are possible episodically in a
   broad corridor from the east TX frontal-wave development region to
   the other in the inland Mid-Atlantic, along and ahead of the
   composite baroclinic zone of front and outflow.  The main concern
   will be locally damaging wind, with isolated severe gusts possible. 
   Isolated large hail also may occur predominantly from east TX to MS,
   where midlevel lapse rates and buoyancy depth will be somewhat
   greater than areas farther northeast.  

   The main supporting factors for strong-severe convection will be
   low-level moisture advection/transport in the warm sector, and a
   belt of favorable mid/upper flow from TX to the Northeast.  A strong
   LLJ also will persist longest in the central Appalachians to inland
   Mid-Atlantic region, elongated low-level hodographs -- but where
   instability will be weak.  The southern rim of that flow belt will
   be traversed by the frontal/outflow zone and convection associated
   therewith, and stronger downdrafts may transport enough momentum
   from aloft to produce locally strong-severe gusts -- especially in
   bowing segments that can orient more orthogonal to the flow instead
   of the largely parallel nature of the convective swath as a whole.  

   Instability and lack of stronger lift at all scales will be limiting
   factors, with the main low-level forcing being along the composite
   frontal/outflow zone that largely parallels flow aloft over much of
   the region.  Weak low/middle-level lapse rates -- evident in many
   12Z RAOBS in and near the outlook area -- include strong midlevel
   stable layers (e.g., JAN, BMX, LCH, LIX, and BNA).  Modified
   forecast soundings depict MLCAPE generally in the 250-800 J/kg
   range, which appears reasonable given abundant cloud cover and
   accordingly restricted diurnal heating.

 

High wind watch in effect for tomorrow.  We look pretty good (fwtw) for at least advisory level wind gusts.

 

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  • Rainshadow6.6 changed the title to 4/29 & 4/30 Obs: Thunderstorms & Then The Howling Winds

Wind took down a tree/power lines outside my development around 5am. Power was out for awhile. Detours remain. 

Going to be a long day with wind issues it appears.

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Shelf season has begun! 😂😂

 

quick hitting storm last night, little breezy, but nothing crazy. 
 

Over/under on KPHL hitting 52mph gusts today. I’ll take the over !

BCB684D1-4166-4C89-8F61-B917006FDBA8.jpeg

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2 hours ago, frankdp23 said:

Wow, my weather station just recorded a 50.1 mph gust.  That is a top 5 gust since I've had it for about 2 years now.

Is yours on the roof?  

I really need to get around to mounting my station to the roof or something.  I know it is supposed to be four times the distance of the height of the nearest structure, but no way that is happening in my yard.  The problem is, my station is about 100 feet south of my house on top of the swing set, so it is sheltered from the typical N/NW winds we get with the worst windstorms.

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5 hours ago, Qtown Snow said:

i was hoping for a down pour to wash down all the pollen, didnt happen, sucks

HA! Ask and you shall receive, nice downpour, wash away that pollen!

 

RAD_KDIX_N0R_ANI (61).gif

2021-04-30_13-14-01.jpg

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19 minutes ago, mshaffer526 said:

Is yours on the roof?  

I really need to get around to mounting my station to the roof or something.  I know it is supposed to be four times the distance of the height of the nearest structure, but no way that is happening in my yard.  The problem is, my station is about 100 feet south of my house on top of the swing set, so it is sheltered from the typical N/NW winds we get with the worst windstorms.

Yeah it is on the roof, so not perfect, but it is the best I can do for winds.  There are no trees within about 100 yards from it, so I'm happy with it.  Plus, my wife wouldn't let me get a pole to mount it.  :)  

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3 hours ago, frankdp23 said:

Wow, my weather station just recorded a 50.1 mph gust.  That is a top 5 gust since I've had it for about 2 years now.

Hey Frank, I have a little hand held anemometer which I might try for kicks, but it is either not reliable or I don't know how to use it. I can tell by looking at my trees and applying the beaufort wind scale that I may be getting estimated gusts at least in the 32 to 38 mph range, perhaps more.

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Gusts 60+ in Harrisburg.

KMDT 301956Z 31040G54KT 10SM

 

Gusts 50+ in Lancaster.

KLNS 302053Z 29024G45KT 10SM -RA FEW090

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