usedtobe

Measured around 1.5" of sleet at multiple points on my sidewalk. The most sleet I've had since 1994.

Rain at 7AM turned to snow by 7:15. The mulch and grass have caved with my temp at 34.3.

Could Capital Weather Gang use your picture with the branch and ruler? I'm not sure they'll use it bu think it's a good one.

I think the 00Z UKMET if extended would be good. It has the primary low in Kentucky and the secondary forming in eastern NC with you under a pretty good wedge.

Rates alone can't but if the atmosphere above is dry, as the snow melts and evaporates the column can cool and help turn the rain to snow. That's what the models have been advertising.

Don't we wish. The Euro slid back but not as far as the UKMET. The 06Z Euro ensembles only give us a 10 to 20 percent chance of 3 inches. The 06Z GEFS loves us. Why do I think it better to be with the UKMET and Euro? Still too early to give up. I still write for the post so that limits me from saying too much until we post our article.

It is pretty good step towards the GFS. Below is a comparison of 00Z 500h and the 12Z. Note how much more ridging takes place ahead of the vort and associated trof and what has happened over Maine. The latter has relaxed allowing more room for our approaching trough. If it relaxes a tad more we might get development a little farther west and more precipitation. There is that pesky impulse ahead of the trof, if it were to minor out quicker that would also help.

The 18Z GFS sure is encouraging. It's not back to yesterday's Euro, but gives me 11".

Well occasionally. Unfortunately, the Euro ensemble mean for the 28th looks pretty bad. I haven't given up on the 28th but would feel better if the Euro and UKMET were on my side than the Canadian and GFS.

One of the problems that is just as important as the weaker ridge behind it is the upper pattern over New England won't allow enough room for a shortwave ridge to form ahead of the trough which keeps it from strengthening and in a sense shears it a bit while also reducing the upper level divergence in advance of the trough compared to what would happen with more room and a better shortwave ridge. That prevents our surface low from getting very far north. At least that's my take. Weaken or shove the troughiness over the northeast a little farther east and we'd be OK. At least I think we'd be OK. Slow the eastward movement of the trof would help do the same thing.

It does differ but still offers no snow, looks like freezing rain. It does have another possible weird looking snow event later in the month but the surface looks really strange. The euro does offer some front end snow but with the surface track and development its got, I'm not sure I buy but hope it's right.

Unfortunately the Canadian also is onboard the GFS express. It looks much different over Canada at 500h but not enough. I'm supposed to be a Winter weather Expert and the last two years, there has been no storms to write about.

Jason and I will have a post on it coming up. Right now we're playing the probabilities for various accumulations lower than suggested by the eps POPS or GFS as there were lots of different evolutions shown on the ensemble stamps. Plus, we're 4 days out and we live around DC.

That's what I thought I remembered from yesterday's Sterling winter weather workshop.

Geoff, How does the Parallel GFS do compared to the current version. I noticed the 00Z parallel from last night had much lower pressure over the Great Lakes than the 00Z operational so it forecast all rain across the area. It was quite a bit farther west with the secondary. Despite the overly rosey Eruo ensemble snow probabilities, the lows were all over the place, lots of spread.

IF I counted right the 06Z Euro ensembles have 12 of 50 members showing snow in the 14th/15th time slot.

0.48" yesterday evening.

Got my tomatoes in last week. Will I need to cover them this weekend? Going to be closer than I'd like. Right now I'm glad I live east of the city.

Yep, 90% of the ensemble members gave us 1.00" liquid as snow 5 days in advance of the the FEB 5, 2010 BLIZZARD. Also, the models keep improving. A 60-84 hour forecast of 0.50" precipitation amounts are now better than 12-36 hour(day 1 forecast) from the 1990s. You're right about chaos, makes forecasting tough but also suggests some patterns are more predictable than others.

AO_vs_nao_snow.gif.jfifAO_vs_nao_snow.gif.jfifAO_vs_nao_snow.gif.jfifAO_vs_nao_snow.gif.jfifAO_vs_nao_snow.gif.jfifAO_vs_nao_snow.gif.jfif

And that's the big problem with the pattern, the ridge position and the location of the max positive anomaly within it. It's not favorable for moving the trough in the west. Of course, the ensemble mean still could be wrong way out there in fantasy land but if it is mostly right and we don't get a hit in the cold window earlier in the month, we probably are screwed through mid January.

Looks to me like there is one window around the 7th or 8th with the cold and then troughiness approaching the east coast. I'd call it partially ajar, far from a perfect pattern but one that could give us something with luck despite the ;latest GFS run taking it away. Still it's probably a long shot but at least its a shot. If that window closes, we may have to wait until the second half of January as the Pac ridge is too far west to supply anything but a negative anomaly in the west. The EPS does build the ridge into ak but towards the end of the run starts pulling it back again. That's so far outside of the skillful range who really cares. This pattern suck if you are a winter wx expert that focuses on DC. I looked for the AO/4 inch snowstorm graph hoping I had it on a thumb drive but it's not. I have it on my old PC so I'll look for it down the road. I need to get all my old excell files on the new PC.

Yep a positive AO/NAO and EPO, not a very inviting look for snow around DC.

Glad I'm not at Sterling. I'd hang with the 06Z Euro as it's the NAM but wow. The last two runs have been mega. We've been NAMed.

My ranking PDI Feb 5-6 2010 Dec 2009 1996 blizzard Feb 1958 March 1958