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E PA/NJ/DE/NE MD/Elko, NV : (Not During Storms) OBS Discussion/Banter Thread


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i think it would be able to handle that amount. 0z euro cut back on the precip 1-2 for the region

Is the latest Euro still on for 1-2 inches? Is this te usual time when the fronts start blowing through with just a small shower ? 1-2 inches is not little. If the fronts are hanging up now, boy are we in store for some overrunning ice storms potentials this late fall /early winter

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Looks like we better enjoy tomorrow.......rather unsettled the rest of the week. Hopefully no prolonged rainy periods.

Wednesday has the potential to be a warm day...watch out for it. Could be a sleeper. High clouds move in early Tuesday AM and Tuesday is cloudy/showery with a warm front--but most guidance has us blowing clear of the front by Wednesday AM.

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Wednesday has the potential to be a warm day...watch out for it. Could be a sleeper. High clouds move in early Tuesday AM and Tuesday is cloudy/showery with a warm front--but most guidance has us blowing clear of the front by Wednesday AM.

Depends on how warm you're thinking. If it's 80ish, that's not very atypical given average highs is 76/77 locally.

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euro follows suit, now going with 3-4 inches over the region from tomorrow to next tuesda..bulk of precip later in the week into the weekend...Then another wave early next week

Swell, just swell. Wettest calendar year on record perhaps? I don't think we've seen the last of the tropical influence yet either.

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euro follows suit, now going with 3-4 inches over the region from tomorrow to next tuesda..bulk of precip later in the week into the weekend...Then another wave early next week

Looks like a nasty cutoff low develops and keeps us cold and rainy.. highs in the 50's with 3-4" of rainfall. Would that be enough to cause river flooding again?

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Looks like a nasty cutoff low develops and keeps us cold and rainy.. highs in the 50's with 3-4" of rainfall. Would that be enough to cause river flooding again?

I know you are asking Tom this question, but I thought I might answer. Last time we had 8-12"+ amounts of rain, and it caused major river flooding. If we end up getting 3-4" of rain this time, I think we might have some flooding problems, but nothing like the last event.

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I know you are asking Tom this question, but I thought I might answer. Last time we had 8-12"+ amounts of rain, and it caused major river flooding. If we end up getting 3-4" of rain this time, I think we might have some flooding problems, but nothing like the last event.

Yea but before we had Irene and Lee, we had some pretty long stretches of dry weather that helped create low water table levels and allowed most of Irene rains and some of Lee's to saturate in before intense run off. Besides a lot of devastation comes from creeks, streams and small rivers overflowing, rather then the mighty susquehanna river. And they take a lot less rainfall to hit major flood levels.

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Yea but before we had Irene and Lee, we had some pretty long stretches of dry weather that helped create low water table levels and allowed most of Irene rains and some of Lee's to saturate in before intense run off. Besides a lot of devastation comes from creeks, streams and small rivers overflowing, rather then the mighty susquehanna river. And they take a lot less rainfall to hit major flood levels.

I would agree with your concern. Major river flooding does not appear to be a problem but the secondary tributaries look to be in real trouble. I would expect a flash flood watch to be in effect by Thursday afternoon for most of the area with localized flash flooding to be the emphasis in the wording for streams such as the Perkiomen, Neshaminy, Little Lehigh etc. The soil profile is still saturated and any prolong storm event of 3-4 inches will be just as bad as a seven inch rain in our area. You might as well consider it the same as it raining on frozen soils where 100% impervious occurs. After 1.5 inches, all of the precip thereafter will runoff.

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Yea but before we had Irene and Lee, we had some pretty long stretches of dry weather that helped create low water table levels and allowed most of Irene rains and some of Lee's to saturate in before intense run off. Besides a lot of devastation comes from creeks, streams and small rivers overflowing, rather then the mighty susquehanna river. And they take a lot less rainfall to hit major flood levels.

Actually, that's not true. August was already the wettest month in PHL history BEFORE Irene.

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early morning HPC discussion for days 2 and 3. :

QUANTITATIVE PRECIPITATION FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

604 AM EDT TUE SEP 20 2011

FINAL DAY 2 AND DAY 3 QPF DISCUSSION

VALID SEP 20/1200 UTC THRU SEP 23/1200 UTC

REFERENCE AWIPS GRAPHICS UNDER...PRECIP ACCUM - 24HR

DAYS 2/3...

...EASTERN U.S....

MODELS ARE IN FAIRLY GOOD AGREEMENT SHOWING A DEEP UPPER LOW

MOVING INTO AND REMAINING OVER THE UPPER GREAT LAKES AS A STRONG

UPPER RIDGE CENTERED OVER THE WRN ATLANTIC HINDERS ANY FURTHER

DOWNSTREAM PROGRESS. WHAT MAKES FOR A DIFFICULT FORECAST ACROSS

THE EAST THIS PERIOD ARE THE NUMEROUS PERTURBATIONS FORECAST TO

LIFT TO THE N IN BETWEEN THE LOW AND THE DOWNSTREAM RIDGE. THESE

WAVES...INTERACTING WITH DEEP MOISTURE DRAWN NWD BY THE RIDGE UP

FROM THE TROPICS AND ALONG THE E COAST ARE EXPECTED TO PRODUCE

WIDESPREAD LGT/MDT TO LOCALLY HVY AMTS. HOWEVER...MODEL SPREAD IS

SIGNIFICANT WITH REGARDS TO THE TIMING AND AMPLITUDE OF THESE

SYSTEMS...LOWERING CONFIDENCE WITH RESPECT TO FINER DETAILS OF THE

FORECAST. IT CAN BE SAID WITH SOME DEGREE OF THE CONFIDENCE

HOWEVER THAT THE NAM IS PROBABLY TOO SLOW/AMPLIFIED WITH THE WAVE

IT TRACKS N THRU THE MID ATL INTO THE NORTHEAST THU INTO EARLY

FRI. THE GFS/ECMWF/UKMET ALL INDICATE A WEAKER MORE PROGRESSIVE

FEATURE AND IN TURN LIGHTER AMTS ACROSS THE REGION. FURTHER

DIFFERENCES EVOLVE LATER IN THE PERIOD ACROSS THE SOUTHEAST/SRN

MID ATL WHEN THE ECMWF/UKMET DEVELOP MORE WIDESPREAD HEAVIER AMTS

AS ENERGY IN THE BASE DIGGING THRU THE BASE OF THE TROF BEGINS TO

SWING EAST. SUSPECT THE GFS MAY BE UNDERDONE HERE...SO LEANED

CLOSER TO THE ECMWF/UKMET. FURTHER TO THE N AND W...EXPECT

LGT/MDT AMTS TO DEVELOP AHEAD OF THE COLD FRONT PUSHING INTO THE

OH/TN VLYS. DEEPER MOISTURE IS EXPECTED TO REMAIN FURTHER TO THE

E...WHICH SHOULD LIMIT THE POTENTIAL FOR ANY WIDESPREAD HVY AMTS

ACROSS THIS REGION.

ORAVEC/PEREIRA

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So east of I-95 is forecasted to get 2-4" of rain by the 0z euro? What about west of I-95?

lol I hope this isnt the start of a seasonal trend for winter....

euro goes 2-4 inches for the region to saturday, heaviest 95 south and east where the 3-4 is...2 -3 north and west... from sat to early next week the closed low brings another 1-2 inches to the region with a total of 4-5 from 95 south and east and 3-4 north and west.

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