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June 2014 Obs and Disco


wxmeddler

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Another day yesterday of watching storm after storm miss me or die as it approached.  A couple of pity sprinkles that couldn't even dampen the ground.  That left my grand total for the week at 0.1".  What a putrid week of weather.  Today, however......

 

73F for the high, with a cool breeze, and not a trace of humidity... and on a Saturday to boot.  Just amazing outside.  Feels like early October. Spectacular.

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Stellar 75.5* here in mid afternoon in mid June; 10/10. Watch the dewpoint disparity tonight at DCA, from 11am-5am, between DCA and the "other stations" included in the DCA hourly observation package.

 

True to form, DCA had a much lower RH value in the overnight hours.  DPs around 49/50.  BWI 50/51, IAD 51/53.  This all makes sense because of the recent rainfall and more vegetation near IAD.  So, it comes down to temps.  BWI and IAD both radiated well (51 as the low for both), while DCA stopped at 60.  So, is DCA's sensor wrong?  Well, most of the downtown DC stations went down to 58 to 60, and the buoy south of DCA had a low of 62.  Seems like the UHI and water temps can account for the DCA low.  So, what's wrong with DCA again?

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The RH thing is interesting and doesn't just sound crazy so worth investigating maybe. But as MN Transplant points out DCA usually fits squarely within other obs close by so it's hard to come to the conclusion that there's some sort of conspiracy there.  Prob need to compare it on those days where we have a 3 degree swing all day across the area with everyone locked in on low clouds/drizzle. 

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Pretty good agreement with the globals that we see the warmest (and mostly dry) stretch of the year mon-wed. Pretty good ridging in our parts downstream from the closed ull in the n rockies. As the low approaches the gl region we may end up in the cross hairs with a wet stretch. Decent agreement there even at this lead. Depends on where the boundary sets up. They seem to like us lately. At least we'll have a 5 day mostly dry stretch to let things normalize a bit. Likely overdone (maybe not...) but the euro/gfs agree point towards 2-4" of rain from thurs-tues or so.

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Pretty good agreement with the globals that we see the warmest (and mostly dry) stretch of the year mon-wed. Pretty good ridging in our parts downstream from the closed ull in the n rockies. As the low approaches the gl region we may end up in the cross hairs with a wet stretch. Decent agreement there even at this lead. Depends on where the boundary sets up. They seem to like us lately. At least we'll have a 5 day mostly dry stretch to let things normalize a bit. Likely overdone (maybe not...) but the euro/gfs agree point towards 2-4" of rain from thurs-tues or so.

I'm not going to make it.   The heat breaks me down in every single way.  When it's 80 degrees I'm whining....this period is going to be unbearable.  

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I'm not going to make it.   The heat breaks me down in every single way.  When it's 80 degrees I'm whining....this period is going to be unbearable.  

 

Come work with me outside for a few days and you will get used to it.  this week will be cool compared to other summers.

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I'm not going to make it. The heat breaks me down in every single way. When it's 80 degrees I'm whining....this period is going to be unbearable.

Unfortunately it looks like a lock for an extended warm/humid period. Not a heat wave or anything but definitely the typical stuff that makes you burst into bullets just going out and getting the mail. For the first time in as long as I can remember, all ensemble guidance through the lr is void of dry continental air for the most part. Maybe we can squeeze another front like this weekend in before the month is done. I have some doubts though.

Mid range is backing off on super wet solutions (kinda figured) but areas may still see rain in the 1-3" range over the next 2 weeks if guidance is right.

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I think we could see some pulse severe today... instability is there even though shear isn't

 

My biggest concern in that is that H7 temps are piss poor and while low topped showers could go, mid level lapse rates are going to keep severe to a minimum or non-existant. There is a bit of model divergence as we get into the late evening. Hi-Res models keep H7 heights steady or even rising into the evening while GFS and NAM cool them off just a bit.

Edit: Agree w/Ian.

 

87 at DCA.

 

HRRR has 95 for the high.

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Unfortunately it looks like a lock for an extended warm/humid period. Not a heat wave or anything but definitely the typical stuff that makes you burst into bullets just going out and getting the mail. For the first time in as long as I can remember, all ensemble guidance through the lr is void of dry continental air for the most part. Maybe we can squeeze another front like this weekend in before the month is done. I have some doubts though.

Mid range is backing off on super wet solutions (kinda figured) but areas may still see rain in the 1-3" range over the next 2 weeks if guidance is right.

:violin::cry:

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I'd put my money on nada for now. 

 

SPC 5% wind reaches into LWX CWA on 1630 OTLK

 

ADDITIONAL STRONG TO MARGINALLY SEVERE STORMS WILL BE POSSIBLE THIS  AFTERNOON OVER THE MID ATLANTIC AS FORCING FOR ASCENT IS ENHANCED BY  A WEAK VORTICITY MAXIMUM CURRENTLY OVER THE UPPER OH VALLEY WHICH  SHOULD TURN SE. VERTICAL SHEAR WILL REMAIN RATHER WEAK...BUT THE  PRESENCE OF A MOIST...MODERATELY UNSTABLE AIR MASS MAY PROMOTE A FEW  SEVERE STORMS CAPABLE OF STRONG WINDS.



			
		
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You can see it on METAR before the obs site refreshes. The 10 line after the T line.

METAR KDCA 161752Z 17004KT 10SM FEW050 31/17 A3011 RMK AO2 SLP195 T03060172 10322 20228 56014

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Some cells further south than HRRR was showing in WV. See how they translate east. Starting to get some cu going up around here after capped looking sunny earlier.

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