Wednesday, October 1, 2014

September in the Rain: Below Normal But Not Abnormally So - A Brief Recap

The always-crummy quality Sterling (LWX) NWS radar* in enhanced base mode reflectivity at 10:13PM EDT September 30, 2014 showing a cluster of thunderstorms over north central and central Maryland barely extending to the immediate D.C. area.

*To be clear and to be fair, all the NWS radars have this same low / crummy quality, in particular the background and text.

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Just a quick morning update with a weather bent...

It's a drizzly, mild morning with low stratus clouds and a few patches of blue. Temperatures are around 65F and dew points around 61F. Last night, there were thunderstorms that pushed through / developed over the area including a downpour right here over "midtown" D.C. -- Dupont / Shaw. National Airport missed all that with only a trace at KDCA.

The National Airport (KDCA) terminal Doppler weather radar close-up on the District of Columbia at 10:22PM September 30, 2014 showing a cluster of heavy rain showers and t-storms right over D.C. into the Maryland suburbs but (of course) missing that dumb rain gauge at KDCA itself. Click on image for larger version.

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By contrast, BWI Airport (KBWI) had a deluge of rain, recording 0.89 inches -- which was not really predicted all that well. Dulles Airport (KIAD) had 0.08 inched and the Maryland Science Center (KDMH) had 0.29 inches. The thunderstorms were more concentrated north of the D.C. area.

As a result of all this, KDCA recorded only 1.11 inches of precipitation in September or 2.61 inches below the normal of 3.72 inches. For the year, it is at 34.78 inches, which is still 4.66 inches above the year-to-date normal of 30.12 inches.

As I see it, September can be a variable month in terms of rainfall amounts -- it only appears similar to the other months because of how more typical dry ones are balanced out against periodic very wet ones with tropical systems.

Oh, yes, this morning, though, KDCA had managed to have a whopping 0.05 inches of drizzle.

For KBWI, it ended September at 3.21 inches or -0.82 inches below the September normal of 4.03 inches.

For the year through Sept. 30th, it is at 41.48 inches or +9.60 inches above the year-to-date normal of 31.88 inches -- not to mention less than 1/2 inch from the current annual average of 41.88 inches.

For KIAD, the numbers are: 0.93 inches for September or a full 2.99 inches below the monthly normal of 3.92 inches and for the year, 37.14 inches or 5.22 inches above the normal year-to-date of 31.92 inches.

OK, that's all.

I intend to update the blog tonight after the gym. That Barracuda update-to-the-restrictive update has been postponed until at least tomorrow. Last night, I walked home from work and then went to No. 9 for a solo happy hour, went to the Safeway to get some groceries, and came home, made dinner and watched TV and went to bed.

--Regulus

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