Jump to content
  • Member Statistics

    17,589
    Total Members
    7,904
    Most Online
    LopezElliana
    Newest Member
    LopezElliana
    Joined

October 29th Obs/Nowcasting


WxUSAF

Recommended Posts

  • Replies 1.1k
  • Created
  • Last Reply

I hope you know I was being sarcastic.

00Z NAM sounding show CHO changing to snow between 11pm and midnight.

No I grew up with Bob and found him very reliable. He has always been on the pessimistic side but more often than not right. If he's really going out on a limb like that, then it's worth listening to.

Link to comment
Share on other sites

Was CHO supposed to be snow now? Does seem a bit off on timing

'

I don't think so, the NWS was forecasting R/Sn tonight with accum ~ .50 inch- same tomorrow....it has a ways to go to hit .50 - I'll tell ya that...still r/sn mix - we just finished with a "burst" of floating flakes. I am still very surprised- I honestly thought a few flakes with little in the way of accumulation- which still may pan out. I'm right on edge of town but in the Ragged "Mts".

Link to comment
Share on other sites

Not really surprising, I agree that DCA will not get anywhere near an inch. Just look at dec 5 2009, I got 5 inches while DCA had barely a dusting.

Ian says historic you say DCA won't get anywhere near an inch.

But those two may not be mutually exclusive.

Link to comment
Share on other sites

Ian says historic you say DCA won't get anywhere near an inch.

But those two may not be mutually exclusive.

They're not of course. Though there is not a 0% chance either. I said almost the exact same thing at the beginning of Randy's thread:

At this point I dunno how anyone has much confidence in anything. I guess maybe that we'll get decent QPF but even that's tricky till you're watching the storm come in on radar. Seems to me around D.C. we're still playing the up to a trace or record October snowstorm game. I heavily discount the latter still, though not as much as before. Yet you can take an example like Dec 5 2009 where it snowed almost all day and DCA picked up .2". So, perhaps even in the low probability "best case" the airport would not pick up that much. As much as I disagree with all the bellyache about DCA early season there is still like a tropical jungle.

Link to comment
Share on other sites

mcd2276.gifMESOSCALE DISCUSSION 2276

NWS STORM PREDICTION CENTER NORMAN OK

1134 PM CDT FRI OCT 28 2011

AREAS AFFECTED...NWRN VA...ERN WV...WRN/CNTRL MD...S-CNTRL PA

CONCERNING...HEAVY SNOW

VALID 290434Z - 291030Z

EARLY-SEASON HEAVY SNOW...WITH RATES OF 1 TO LOCALLY 2 IN/HR...WILL

DEVELOP AND SPREAD NNEWD AFTER 09Z...AND CONTINUE THROUGH SATURDAY

MORNING.

A STRONG MID-LEVEL IMPULSE ROUNDING THE BASE OF A LONGWAVE TROUGH

OVER THE CNTRL/ERN CONUS WILL PROGRESS ENEWD TOWARD THE MID ATLANTIC

TONIGHT. AS THIS OCCURS...INTENSE LOW/MID-LEVEL FRONTOGENESIS WILL

OCCUR BENEATH A POWERFUL UPPER-LEVEL SWLY JET MAX /CORE SPEEDS

REACHING 150 KT AT 250 MB AFTER 09Z/ OFFERING STRONG DCVA. THESE

ELEMENTS ARE BEING MANIFESTED IN THE BAROCLINIC LEAF STRUCTURE

ALREADY TAKING SHAPE OVER THE LOWER GREAT LAKES AND OHIO VALLEY PER

RECENT WATER VAPOR IMAGERY. THE LARGE-SCALE ASCENT WILL SUPPORT THE

DEVELOPMENT OF AN 850-MB WAVE...WHICH IS FORECAST TO RIDE NEWD ALONG

A BAROCLINIC ZONE STRETCHING FROM THE WRN CAROLINAS INTO THE

DELMARVA REGION. INCREASING ELY/SELY FLOW AHEAD OF THIS WAVE WILL

ENHANCE UPSLOPE FLOW INTO THE CNTRL APPALACHIANS. ALSO OF

NOTE...SUBSTANTIAL LOW/MID-LEVEL MOISTENING HAS ALREADY TAKEN PLACE

IN ASSOCIATION WITH THE EARLIER PASSAGE OF A LEAD WAVE /REF

BLACKSBURG AND STERLING VA 00Z RAOBS/. GIVEN THESE FACTORS...AN

INCREASE IN SNOWFALL RATES IS ANTICIPATED FROM SSW TO NNE AFTER

09Z...AS AFFIRMED BY RECENT RUNS OF THE EXPERIMENTAL HRRR AND

EXPERIMENTAL ENSEMBLE HIGH-RESOLUTION WRF GUIDANCE.

SNOWFALL RATES OF 1 IN/HR WILL BE LIKELY THROUGHOUT THE DISCUSSION

AREA. HOWEVER...THE MOST FAVORABLE JUXTAPOSITION OF THE

AFOREMENTIONED FORCING MECHANISMS COULD SUPPORT LOCALLY HIGHER RATES

/POSSIBLY UP TO 2 INCHES PER HOUR/ WITHIN 35 MILES EITHER SIDE OF A

LINE FROM STAUNTON VA TO HAGERSTOWN MD TO HARRISBURG PA. ALSO IN

THIS AREA...NAM/GFS CROSS SECTIONS OF THETA-E AND GEOSTROPHIC

MOMENTUM SUGGEST CONDITIONAL SYMMETRIC INSTABILITY DEVELOPING IN THE

MID LEVELS TOWARD 12Z...COINCIDENT WITH SLANTWISE CAPE INCREASING TO

150-200 J/KG PER EXPERIMENTAL NAM OUTPUT. THIS WILL FAVOR

WSW-ENE-ORIENTED HEAVY SNOW BANDS...AND AN ISOLATED LIGHTNING STRIKE

OR TWO CANNOT BE RULED OUT. THE HEAVY SNOW WILL LIKELY CONTINUE

THROUGH SATURDAY MORNING...WITH RATES TAPERING OFF FROM SSW TO NNE

AFTER 18Z. FOR LOCATIONS FARTHER EAST /INCLUDING AREAS FROM

BALTIMORE TO THE DISTRICT OF COLUMBIA/...FORECAST SOUNDINGS SUGGEST

THAT WARMER THERMODYNAMIC PROFILES WILL BE LESS CONDUCIVE FOR HEAVY

SNOW.

..COHEN.. 10/29/2011

ATTN...WFO...CTP...LWX...RNK...PBZ...RLX...

LAT...LON 37757909 37457967 37508016 37838050 38848036 39697979

40187921 40447854 40507743 40247664 39517678 38687774

38087850 37757909

Link to comment
Share on other sites

Rain is becoming heavier with time as the coastal low develops. Steady northerly flow continues, 37 degrees. yellows are beginning to develop and move in from the SW on the radar returns.

Western VA is going to get clocked by severe heavy snow rates, CSI banding and possibly thundersnows - lotsa dynamics with this system

Wind flow developing a NELY component

Moisture streaming right over my BY for hours from the SW - no letup at all - no breaks in the pcpn - just keeps getting heavier with time

Link to comment
Share on other sites

Rain continues - temps rose to 37, as did the dewpoint - massive boundary layer warming is evident.

My BY will be spared the heavy wet snow.

Temps bottomed out at 36 which was also the dewpoint. Now temps and dewpoints are rising despite cold air advection

This is definitely one heavy wet snow event I wanted to miss because of all the leaves on those trees. Heavy wet snow is fine in January, not late October.

We're not missin' a thang... thumbsupsmileyanim.gifthumbsupsmileyanim.gifthumbsupsmileyanim.gif

All in all - I am jazzed - VERY ELATED that I'll receive 2 inches of rainfall - and my house will be just fine.

It may be high time to throw a block party with kegs of cold beer

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...