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September Discobs 2022


George BM
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2 hours ago, Weather Will said:

WB 10Z HRRR shows locally heavy storms in the mid afternoon through pm rush hour.  Supports the flood watch.

 

Hoping I get missed! Have found that I have a roof leaking after a recent downpour. Need that handled first... NAM on board with locally heavy precipitation. Location will make all the difference!

 

qpf_acc.us_state_de_md.png

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WPC issue Mesoscale Precipitation Discussion #988: https://www.wpc.ncep.noaa.gov/metwatch/metwatch_mpd_multi.php?md=988&yr=2022

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14-day rainfall along and west of I-95 has been generally 150-300%
of normal, producing 0-40cm soil moisture that is in the 90-95th
percentile according to NASA SPoRT. This has also produced 3-hr
FFG that is as low as 1.5 inches in some areas, for which the HREF
indicates has a 30-40% chance of exceedance. The most likely area
for flash flooding today will be where any training occurs atop
the most saturated soils, or within any of the more impermeable
areas including the I-95 urban corridor. Flash flooding is
possible this aftn and into this evening, before instability
begins to wane and drier air advects east with the cold front.

 

 

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18 minutes ago, high risk said:

    Is there a box out??    I haven't seen one....

No. I'm surprise we aren't.

13 minutes ago, George BM said:

I think he meant that he's surprised that we are NOT under a Severe T-storm Watch w/ a SLGT risk from SPC based on the activity that he's seeing in the region.

That's....what I said.

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13 minutes ago, George BM said:

I think he meant that he's surprised that we are NOT under a Severe T-storm Watch w/ a SLGT risk from SPC based on the activity that he's seeing in the region.

      Ah, that makes sense - I misinterpreted.     As I mentioned in the SVR thread, I thought that a SLGT was possible, but the MRGL may work ok.   I do expect several warnings and a handful of wind reports (and an outside chance of a brief TOR).

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Special Marine Warning
ANZ535-536-122130-
/O.NEW.KLWX.MA.W.0250.220912T2001Z-220912T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Baltimore MD/Washington DC
401 PM EDT Mon Sep 12 2022

The National Weather Service in Sterling Virginia has issued a

* Special Marine Warning for...
  Tidal Potomac from Indian Head to Cobb Island MD...
  Tidal Potomac from Key Bridge to Indian Head MD...

* Until 530 PM EDT.

* At 401 PM EDT, a strong thunderstorm was located 10 nm west of
  Quantico, moving east at 10 knots.

  HAZARD...Wind gusts 34 knots or greater.

  SOURCE...Radar indicated.

  IMPACT...Boaters in small craft could be thrown overboard by
           suddenly higher winds and waves capsizing their vessel.

* Locations impacted include...
  Quantico, Indian Head, Occoquan Bay, Gunston Hall, Mason Neck State
  Park and Leesylvania State Park.
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