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Drought busting rains PRE event


dailylurker

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While many are forcusing on the next 24,  I'm more interested in the period around 96hrs.   The heaviest with the first round will likely be well west of mby.  Of more interest is the second as the first will probalby have saturated the soil so any second big rainfall event could really cause problems.  It's too early to pin down any details as the GFS, CMS and Euro are quite a bit different from each other but the 96hr GFS has the classic look of a PRE, one of those heavy rainfall events that occur around tropical systems but not directly a result of them.  Note first that the GFS  still has Joaquin well offshore but has a rainfall maximum along the frontal boundary across the Mid Altantic.

 

post-70-0-04366600-1443555858_thumb.png

 

Now look at where the stripe of heavy rainfall is with respect to the upper level jet streak.  It's along the entrance region (right rear quadrant). 

 

post-70-0-36496900-1443555972_thumb.png

 

The GFS may very well be wrong but the entire set up is interesting no matter which model you pick though the heaviest may still end up either west or north of us.  Anyway a few random thoughts

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It's practicing for winter. Dr. No!

 

I got stuck doing work and just looked at the euro. Odd progression but generally speaking it's plausible in the sense that Joaquin never really gets involved with the trough other than providing some juice. 

 

I don't think much has been figured out today. The envelope of solutions is about as wide as 24 hours ago. Ens mean precip across the board is impressive. That part is becoming high confidence but it would sure be nice for some excitement other than downpours. 

The trough is mostly a closed low on the Euro.. the storm gets so far south that it mainly interacts with the westerlies. Makes sense it sort of just gets punted though I'm not sold that's the most likely scenario given the blocking. Ens mean is still west of the op though it has both ideas mixed in really. 

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You guys have gotten raked.

 

If we get what several of the models have been putting out, it would be devastating. 5.65" since Friday on my station in Roanoke with some areas up to 8" already. 

 

My legend doesn't go high enough to cover what has fallen south of Roanoke.

 

dSMYivl.jpg

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TROPICAL STORM JOAQUIN DISCUSSION NUMBER 8
NWS NATIONAL HURRICANE CENTER MIAMI FL AL112015
ISSUED BY THE NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
500 PM EDT TUE SEP 29 2015

The cloud pattern of the storm has become better organized during
the day, with the low level center now embedded inside the northern
edge of the main area of deep convection. Animation of cirrus
motions suggest that upper-level outflow is becoming a little more
prominent over the northern portion of the circulation, and this is
consistent with decreasing northerly shear. Flight-level,
dropsonde, and SFMR wind observations from an Air Force
reconnaissance aircraft indicate that Joaquin has strengthened and
the intensity is now estimated to be 55 kt. With a more favorable
upper-level wind environment now expected to prevail, the official
forecast calls for more strengthening than the previous advisories.
Joaquin is expected to become a hurricane within 24 hours, with
additional intensification likely thereafter. The NHC intensity
forecast is similar to the latest SHIPS model output.

Fixes from the aircraft show a southward component of motion and
the initial motion estimate is now 240/4 kt. Joaquin is currently
south of the southwestern periphery of a weak mid-level ridge. The
ECMWF model shows this ridging to the north of the tropical cyclone
to be more prominent over the next few days than the other dynamical
models. Consequently, the ECMWF takes Joaquin more to the
west and southwest through 72 hours than any of the other available
guidance. Later in the forecast period, there is a significant
divergence in the track guidance. The HWRF and U.K. Met Office
models forecast Joaquin to move over the east coast of the United
States later in the period whereas the ECMWF and GFS keep the system
well offshore. The official forecast lies between these
possibilities and is similar to the latest Florida State University
Superensemble solution.

Interests in the Bahamas should monitor the progress of this storm.
Watches or warnings may be issued for portions of these islands
later this evening.

FORECAST POSITIONS AND MAX WINDS

INIT 29/2100Z 26.0N 71.0W 55 KT 65 MPH
12H 30/0600Z 25.8N 71.6W 60 KT 70 MPH
24H 30/1800Z 25.5N 72.5W 65 KT 75 MPH
36H 01/0600Z 25.1N 73.3W 70 KT 80 MPH
48H 01/1800Z 24.8N 73.9W 75 KT 85 MPH
72H 02/1800Z 25.0N 74.0W 80 KT 90 MPH
96H 03/1800Z 29.0N 73.0W 80 KT 90 MPH
120H 04/1800Z 34.0N 71.0W 75 KT 85 MPH

$
Forecaster Pasch

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