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Tracking the Jan 7-9 threat---for those with strong hearts


MDstorm

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988 off nc at 156, 976 off delmarva at 162 972 moving perhaps a hair north of east at 168 nearing 70w

.5+ for most of dc area... leesburg on fringe of that.

1"+ east of the bay

qof from this

dc .75-.85

balt .85

nyc .7-.75

phl 1

centreal md 0.50"

DC 0.60"

RIC 0.50"

ALL OF DEL 1"+

NYC 0.50"

ORF NEAR 1"

philly near 1"

central nj south all 1"+

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Nao values for the 12Z Euro. Would say they show an event day 6 through 8.

2010123012z ECMWF RUN NAO Values

NAO value for forecast hour 000: -397.618866

NAO value for forecast hour 024: -370.204193

NAO value for forecast hour 048: -354.013947

NAO value for forecast hour 072: -375.784729

NAO value for forecast hour 096: -349.911957

NAO value for forecast hour 120: -417.866241

NAO value for forecast hour 144: -463.840637

NAO value for forecast hour 168: -420.923492

NAO value for forecast hour 192: -349.040161

NAO value for forecast hour 216: -353.795532

NAO value for forecast hour 240: -333.022156

NAO value for Day 1-5: -373.556213

NAO value for Day 6-10: -384.12439

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On Thursday

looking at the surface temps on the Euro, places like PHL and NYC are around +1C during the height

even BWI gets as high as +.5C with .66"

verbatim, a wet snow along I95

IAD stays below freezing, but has less qpf, .42"

DCA gets .52", but only gets up to .4C at surface (a hair cooler than BWI!)

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Looks like the euro is the only model showing a miller a type scenario...a good amount of the gfs ensembles and it looks like the ggem is showing a miller b that develops off the coast north of us

Same thing happened with the last storm. Only the Euro was right that it ended up a Miller A track.

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There is a lot of spread in how the models are handling the block right now. At this range I'd lean toward the Euro, and it nailed the blocking and phasing setup with the last storm at this range fairly well. We'll have to wait 2-3 more days to figure out what happens with the block, which will ultimately determine the track and whether it's cold enough here. WIth the last storm the Euro overamplified the storm consistently so I wouldn't pay much attention to the strength of the low pressure, but the track may be somewhat viable if it's handlign the blocking setup better than other models.

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The 18Z GFS phases the 4 corners s/w with the first northern stream s/w, and it's quickly off the coast. The Euro phases with the second northern stream s/w hence the solution it has. It's like deja vue and depends on how the phase takes place. I wouldn't bet against the Euro day 3-5 range, but we shall see.

Edit: by day 8 the GFS brings the PV basically down over us and retrogrades the block back to the NW Territories. Very unlikely, IMO.

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