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May 17th - 21st Severe Weather Thread


andyhb

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Wonder what's happening... parameters aren't that impressive and LCLs are sky high...

MCD from SPC:

DISCUSSION...NUMEROUS TORNADO REPORTS HAVE OCCURRED IN THE PAST HOUR

WITH A TSTM CLUSTER JUST AHEAD OF AND ALONG A COLD FRONT ANALYZED

FROM AROUND 20 W CNK TO 20 SE P28. THIS THREAT HAS BEEN MAXIMIZED

ALONG THE N/S TO NE/SW INFLECTION POINT OF THE FRONT WITH THE

ORIENTATION OF THE CLUSTER...INTERCEPTING THE LOW-LEVEL MOIST AXIS

CHARACTERIZED BY LOWER 60S SURFACE DEW POINTS. THIS THREAT WILL WANE

AS LOW-LEVEL FLOW HAS COMMENCED WEAKENING PER TIME-SERIES OF ICT VWP

DATA. THIS WEAKENING SHOULD PERSIST WITH FLOW BECOMING INCREASINGLY

DIVERGENT AS WELL WITH NEB SHORT WAVE IMPULSE PROGRESSING AWAY FROM

THE REGION.

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That's what I thought. I'm 45 minutes SSW of you.

More storms developing in Minnesota. The main one is getting stronger.

Just got 5 mins of hail here. Up to nickels. Hail follows me. I never saw hail in MN/ND for about 2-3 years straight...I have seen hail about 20 times alone in NE since being there for 14 months...now here.

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I'd say the SPC f'd up with the Severe Thunderstorm Watch, and only have 10% Tornado Probability with the Watch, considering there were 18-Tornado Reports inside the Watch...

Not to be rude, but you have been posting a lot of this confrontational type stuff lately.

They did not "f" up, as David posted, there was an unforecasted enhancement of the horizontal vorticity and velocity in the area of the tornadic development. The LCLs also lowered more than expected.

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I'd say the SPC f'd up with the Severe Thunderstorm Watch, and only have 10% Tornado Probability with the Watch, considering there were 18-Tornado Reports inside the Watch...

SPC did not "f up" as you say. The blue box was spot on per data and obs. The only thing they could have possibly done, was change the watch over to a tornado watch once the tornadoes were in progress. But being 95% of them were in a 2 county area, and the fact that most of them were very short lived gustnadoes, there really was no point. They did fine. Sometimes you need to sit back and not post everything that comes to mind.

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I will say that I was impressed at the amount and speed at which these small-scale circulations developed this afternoon. It seemed like we had multiple, short-lived tornadoes at various points of the storm complex. It does look like we had two to three more defined, longer lived circulations that produced more substantial tornadoes. We didn't have 18 tornadoes, but I'm willing to bed that we had several. Early on in the event, I was betting that most of the tornado reports would end up being gustnadoes, but it looks like they ended up being bonafided tornadoes. An unbelievable prize to those who caught the tornadoes, but an unbelievably painful insult to those who didn't...

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I did say "Tornado Reports" I perfectly know that there weren't 18 Tornadoes. I was just stating in a more vibrant way that a 10% Probability of two or more Tornadoes inside the watch was a bit low... And, it was a Localized event, but I have seen them issue Tornado Watches for specific Storms that were 2 to 4 Counties.

In a normal severe watch, the basic probs are 20/5, the probs being slightly higher would have meant nothing. You didn't mention only probs, you flat out said SPC f'd up. Acting like you know better then the pros that forecast, will get you nowhere. Especially when you know as little as you do. There's a reason why I don't post much when the forecasting time comes, because I'm not good at it. I observe, and learn. Seriously, read more and post less, and stop mucking up the severe threads with crap like this.

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This is just about what I expected in Minnesota for today, there have been a couple of reports of 1" hail in the MPX's area, and one report of a couple of 12" diameter trees down in a very localized area, seems to me like the SPC was spot on with only a 5% risk for today. If we would have had better shear values it would have been very interesting. Now looking at PW values of the 20/0z nam for tonight, along with the LLJ, it looks like eastern MN and the TC's metro is going to see some heavy rainfall's as the low leve jet overruns the slow moving cold front. That is welcomed news to me.

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