Thursday, August 2, 2018

July Regional Rainfall Summary Stats Plus August Daily Tallies (With Frog Rain Gauge Image Extravaganza); Also, 30-Years and the Glen Burnie Same Place Later (The Prequel)

Blue sky fleeced with a mix of clouds -- cirrus tufts and cumulus -- as seen from the 1300 block V Street NW, Washington, D.C., 1:17 p.m. August 2, 2018.


This entry contains an update on our regional rainfall totals this suddenly-very-wet summer. I'm also posting a very brief update at the end of the entry.

Below is the information on July's rainfall totals for the three regional airport NWS climate stations. I'm also relating today's rainfall tallies and the season and year-to-date totals and departures from normal.

For the latter, I'm including the Maryland Science Center (KDMH) at the Inner Harbor. KDMH records begin in April 1998 -- so there isn't yet a full 30-year dataset for average (normal) values.

I've adapted the info from Sterling's area forecast discussion (AFD) yesterday that contained a climate discussion.

Preliminary data shows that July was one of the wettest on record across our region.

Top five wettest Julys:

1. 11.06" (1945)
2. 10.63" (1886)
3. 9.95" (1905)
4. 9.73" (2018)
5. 9.59" (1922)

Keep in mind that KDCA had ZERO rainfall for the first 16 days of July 2018, which was a record dry July spell.

This makes the monthly total even more impressive.

NWS precipitation records for Washington D.C. have been kept at Ronald Reagan Washington National Airport (KDCA) since June 1941, although I've also read that 1945 was when "official" record-keeping began there. (It might be the case that records were kept jointly at the old 24th and M St NW spot and KDCA for a period of time.)

Additional rainfall records observed downtown -- at M and 24th St NW -- date back to January 1871. (Snow records began in Jan. 1888.)


1. 16.73" (2018)
2. 11.03" (1889)

Note 1: August of 1955 was the all-time wettest month with 18.35 inches. Rainfall records for Baltimore have been kept at Baltimore - Washington International Thurgood Marshall Airport (KBWI) since 1950.

Note 2: The airport was officially dedicated June 24, 1950.

Note 3: The airport was originally called Friendship Airport but renamed BWI Airport in 1973. The Thurgood Marshall part was officially added on Oct. 1, 2005.] Additional rainfall records observed downtown -- at the U.S. Custom House -- date back to Jan. 1871. (Snow records began in Dec. 1883.)


1. 11.21" (2018)
2. 8.80" (2017)

Weather records have been kept at Washington Dulles International Airport (KIAD) since it opened in April 1960, although there are big gaps in 1961 and 1962. Continuous rainfall record-keeping began in March 1963.

Snowfall records began at KIAD in Nov. 1962.

Information source here.


Below are August daily precipitation updates plus monthly, seasonal, and yearly tallies (each "to date").  

Note: "Season" here refers to climatological summer, which runs from June 1st - Aug. 31st.

Daily: 1.03"
Month-to-date: 1.28" +1.07" (0.21")
Season-to-date: 16.22" +8.50" (7.72")
Year-to-date: 36.19" +12.51" (23.68")

Note: Today's daily record of 6.14" is the 2nd wettest single day ever in D.C. set August 2, 1944. The all-time wettest for a single calendar day is 6.39" on Aug. 23, 1933 (a pre-airport record).

The 3rd wettest was 6.11" on June 21, 1972 (in Hurricane Agnes). I think those are the only three 6+ inch days. In more recent times, the 5.19" on June 25, 2006 is the most in a single calendar day (and I think that one ranked 6th wettest, but I'm not entirely sure about that.)

I'd also like to note the information in a tweet from CWG's Ian Livingston and featured in this CWG entry:

Today is the 14th day this year with 1 inch or more rainfall at KDCA. Year-to-date (YTD) leaders for 1"+ days:

1886: 18 days
2018: 14 days
1891: 14 days
1889: 12 days
2005: (and others), 11 days


Daily: 0.24"
Month-to-date: 0.48" +0.24" (0.24")
Season-to-date: 21.98" +14.21" (7.77")
Year-to-date: 41.90" +17.10" (24.80")

Note: Today's KBWI total pushed its yearly total just above the current annual average of 41.88 inches.


Daily: 0.08"
Month-to-date: 1.17" +0.93" (0.24")
Season-to-date: 16.55" +8.66" (7.89")
Year-to-date: 37.20" +12.49" (24.71")

Daily: 0.03"
Month-to-date: 0.60" +0.37" (0.23")
Season-to-date: 14.00" +5.88" (8.12")
Year-to-date: 36.39" +12.18" (24.21")

Note: The KDMH avearges and departures are based on a partial climate record back to April/May 1998 for the Maryland Science Center (that's when the ASOS station was commissioned).


Downing and Vaux Condos as seen from 30th St NW, Georgetown, Washington, D.C., 4:18 p.m. July 29, 2018.

The picture and the remainder below were taken by me on my Sunday walk to Georgetown (to Martin's Tavern) and back.


As a brief update …

Near the intersection of Q and 30th St NW, Georgetown, Washington, D.C., 4:18 p.m. July 29, 2018.


I'm home at this late hour after work and the gym. Yes, I made it to the gym three times this week -- and had good workouts each time, each time ending with a swim.

Of note, I'm heading to Glen Burnie this weekend to visit my mom -- my trip last weekend having been nixed by circumstances. My plan is to go up tomorrow afternoon and return on Monday.

Bicyclist passing parked cars, 3100 block Dumbarton St NW, Washington, D.C., 4:28 p.m. July 29, 2018.


However, I need to do my laundry before I leave tomorrow. I was going to do it tonight, but it is already 1 a.m., and I'm so damn tired.* I am teleworking tomorrow from home in the morning, so I suppose I can do it then.

*To clarify, I initially posted this entry just before midnight so that it would have a date stamp of Aug. 2nd. I didn't complete and post it until nearly 2:20 a.m. Friday.

P Street near Dupont Circle, Washington, D.C., 7:20 p.m. July 29, 2018.


Oh, yes, for this weekend -- and I'll have more to say on this in an entry either tomorrow or Saturday -- I'm going with my friend Lynda to our 30th high school reunion on Saturday night in Ferndale (next to Glen Burnie). I had no intention of going but, again, circumstances intervened -- including the fact that her husband didn't want to go -- means that I can.

Evening sky as seen from the 1600 block P Street NW, Washington, D.C., 7:30 p.m. July 29, 2018.


Glen Burnie High School Class of 1988 reunion.

My expectations are rock bottom. I'm anticipating a Hit Parade of, maybe, one-fifth of the bottom half of the class (and their spouses) show up -- that is, the folks who never actually left Glen Burnie and immediate environs and who do things such as attend high school class reunions. Again, I'll have more to say about this, as well as a political-themed entry, tomorrow (Friday).


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