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WxChallenge 2013-14


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The wildcard in my mind comes down to the low temperature tonight. There seems to be two scenarios through the past 10 days for this location...either the low completely drops off the table and ends up on the low end of guidance (Mar. 8th, 13th and to some extent the 16th) or the winds hang on and it's on the high end of guidance.

Given gradually decreasing winds tonight, dews in the lower 20s, mostly clear skies and the fact that the 8th/13th are fair analogs in terms of wind speed, I leaned slightly lower. You can really make a case either way depending on how you analyze the setup.

Two clear clusters in guidance:

MET 38 / MAV 40 / ECM 40

USL 43 / SREF 43 / LAMP 45

good post .. for this reason i went cold tn but at the last minute i considered going 2-3 degrees higher. def risky move - especially since this has been the city I've done the best in, but I went with my 'gut' and kept it.

73/38/9/0

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Ugh, it was looking so good for 75F... now I'm not even sure it'll get to 73F.

Nah, RDD just did a joke on us. Up to 72F now. Still 75F looks good. Just keep that wind direction out of the north and it will get there by 0z or just a little after 0z like it did with the 72F yesterday. 

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Nah, RDD just did a joke on us. Up to 72F now. Still 75F looks good. Just keep that wind direction out of the north and it will get there by 0z or just a little after 0z like it did with the 72F yesterday. 

 

Yeah, good to see 72F this hour. Hopefully 75F. Even 74F would be okay. 73F would have been bad for me.

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72 again.

Max was 73...so far...

 

For tomorrow:

75/39/10/0.00

 

Not going as low tonight as dews are in the upper 20s (9F higher than 24 hours ago) and there is some moisture aloft moving in. For highs tomorrow, the potential looks similar to that of today given the thermal profile, but we'll see if it can actually get to 75. 

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76/45/14/0 for Thursday.

 

With a tightening pressure gradient tonight, the winds may actually increase overnight. That may keep things from bottoming out, but I really don't know. 4km NAM and RAP both struggling to drop below 47 or so, while MOS was 37-40. With similar mid-level temps, similar mixing heights, and what should be a better downsloping flow for tomorrow went warmer on temps. With such a tight pressure gradient I just couldn't buy the low wind numbers the models were spitting out...especially with the way northerly winds tend to funnel into and accelerate into the valley. So we'll see what happens.

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76/45/14/0 for Thursday.

 

With a tightening pressure gradient tonight, the winds may actually increase overnight. That may keep things from bottoming out, but I really don't know. 4km NAM and RAP both struggling to drop below 47 or so, while MOS was 37-40. 

In my experience, the higher resolution NAM and RAP tend to be too mild/high in good radiational cooling setups. I've seen cases where they might predict 47 for example in Connecticut and the low ends up being in the 30s. With that said, light winds, higher dews and some mid-level moisture will most likely keep temperatures higher tonight than they were last night.

 

Big spread on the low forecast...anywhere from 37 to 47 each had at least 33 forecasts apiece.

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In my experience, the higher resolution NAM and RAP tend to be too mild/high in good radiational cooling setups. I've seen cases where they might predict 47 for example in Connecticut and the low ends up being in the 30s. With that said, light winds, higher dews and some mid-level moisture will most likely keep temperatures higher tonight than they were last night.

 

Big spread on the low forecast...anywhere from 37 to 47 each had at least 33 forecasts apiece.

I tend to agree with what you've noted about the NAM especially. The RAP has actually tended to really bomb temperatures (as in ridiculously cold) when there's deep snowcover over the Midwest/Ohio Valley this winter, but the NAM often runs warm. I can see the RAP running warm with no snow cover though, which obviously applies to RDD.

 

For this city, it seems like either things work and temps drop into the upper 30's, or they don't work (some wind, or some clouds) and stay in the mid to upper 40's. I'm hoping that they don't work tonight. Day 4 has been the only "in between" low so far, everything else seems to be in either camp.

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