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June Discobs 2025


George BM
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2 hours ago, frd said:

Interesting boundry across the lower Delaware Bay on radar, and several cells forming across NE Maryland in a West to East fashion and moving East 

Flash Flood Statement
National Weather Service Mount Holly NJ
502 PM EDT Sun Jun 29 2025

DEC005-300015-
/O.CON.KPHI.FF.W.0022.000000T0000Z-250630T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
502 PM EDT Sun Jun 29 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS
EVENING FOR SOUTHEASTERN SUSSEX COUNTY...

At 502 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 3 inches of rain have fallen, with the greatest totals near
Indian River Bay and Indian River Inlet. The expected rainfall rate
is 1 to 2 inches in 1 hour. Additional rainfall amounts of 0.5 to 1
inch are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets, and underpasses as well as other
         drainage and low lying areas.

Some locations that may experience flash flooding include...
  Millsboro, Millville, Long Neck, Ocean View, Indian River Inlet,
  South Bethany and Dewey Beach.
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10 minutes ago, Mrs.J said:

My station page is showing my last rain even was 2 days ago. Mind you that was only 0.04. I have had to get into the mode of watering my gardens every other day after such a wet May early June. 

We also got fringed and dodged here over the weekend. Maybe a tenth. But this year (compared to last) my garden has a lot more soil moisture, so I'm letting things go for a few days and they don't seem to mind. Need rain today though or I'll be out there this evening watering.

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Surprised to see DCA is only running +0.5F for the month. Looks to be the lowest of all sites (including reporting cooperative observations) in the IWX CWA, with the majority of stations running between +1.5F and 3.5F. There were a couple stations with an anomaly close to that of DCA, and a few warm outliers (> +4F), but DCA looks to have the lowest anomaly of all sites.

It is worth noting that the "normal" is 0.5F above the 1991-2020 mean, so if not for that added warming from NOAA, it would be +1.0F for the month and more in line with surrounding sites. Most of the co-op "normals" are just based on simple averages, I do believe. As an aside, I always cringe when people object to calling it a "normal" and instead call it "average" when it's NOT an average. The justification being there's no such thing as normal in climate, ignoring that the term has a specific meaning in this context, and calling it an average is just plain incorrect. I have seen some stations where the "normal" is as much as 1.5F above the 1991-2020 mean.

2eqiFtS.png

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With that said, still a far cry from the olden days of the 2010s, when DCA would far outpace all other sites in the CWA not named "Maryland Science Center." Looks like they got most of that so-called UHI in check at National Airport. At the height of its urban heating days, in 2015, it was 1.5F warmer than any other site. Even beating DMH by 1.8F. With the 2015 sensor in place, would probably be making a run for record warmest. :lol:

2025

racWgaR.png

2010

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2015

BEyFjpg.png

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Same areas in SE Delaware that got slammed yesterday are getitng slammed again today. Northern DE. also with storms. Flash Flood warning and severe storm warning posted in each area.  

Of course I missed them again for the third day in a row.  

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District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Southern Baltimore-Prince Georges-Anne Arundel-Northwest
Montgomery-Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Fairfax-Arlington/Falls
Church/Alexandria-Eastern Loudoun-
307 PM EDT Mon Jun 30 2025

...FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...Portions of DC, including the following , District of
  Columbia, Maryland, including the following areas, Anne Arundel,
  Carroll, Central and Southeast Howard, Central and Southeast
  Montgomery, Frederick MD, Northern Baltimore, Northwest Howard,
  Northwest Montgomery, Prince Georges and Southern Baltimore, and
  northern Virginia, including the following areas, Arlington/Falls
  Church/Alexandria, Eastern Loudoun and Fairfax.

* WHEN...Until 11 PM EDT this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
  - Thunderstorms are expected to develop in the next couple of
    hours across parts of the Baltimore and Washington metro
    areas. Storms are expected to be slow movers and be capable
    of producing intense rainfall rates of 1 to 2 inches per
    hour, which may result in flash flooding of small streams,
    creeks, urban and poor drainage areas.
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