RodneyS Posted February 25, 2016 Share Posted February 25, 2016 At 2:52 PM today, there was a temperature difference of 21 degrees between DCA (65) and IAD (44). Not a record, as on both January 21, 1984 and January 28, 1987, the daily DCA/IAD minimums differed by 24 degrees (8 and minus 16, and 7 and minus 17, respectively). However, both of those occurred with significant snow on the ground at IAD and a clear night, and so radiational cooling was the source of the extreme difference in morning lows. Does anyone know what the record is for the largest afternoon difference, both at the same time and for the entire afternoon? (IAD is still forecast to reach about 60 later today.) It looks as if the IAD temperature peaked at about 52 this afternoon (and is now higher), so the afternoon difference between DCA and IAD was only about 13 degrees. To my surprise, I found that the greatest difference in the daily maximum temperature at the two airports is four degrees higher. That occurred on December 9, 1975, when DCA recorded a high of 53 and IAD 36. So, today did not come close to that, although there is still the question of the greatest difference at the same time. By the way, I found a third case of a 24-degree difference in the daily minimums, which occurred on February 13, 1983, when DCA recorded 16 degrees and IAD minus 8. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted February 25, 2016 Share Posted February 25, 2016 The 2.61" of rain at BWI yesterday was a daily precip record and also the 3rd rainiest day in February (maybe I should say "liquid precip" instead of "rain", cause 2nd place is 2/11/83 which was liquid equivalent of snow). Link to comment Share on other sites More sharing options...
RodneyS Posted March 1, 2016 Share Posted March 1, 2016 Pretty interesting 2015-16 meteorological winter at DCA, as despite the blizzard and relative cold of January, the average temperature was 42.0 degrees -- good enough for an 8th place tie for warmest in DC history. The last Super El Nino, in 1997-98, was the 6th warmest DC winter at 42.4 degrees. However, that winter lacked the variability of this one, with a standard deviation from the average daily winter temperature of only 6.1 degrees, compared to 10.7 degrees this season. In fact, this winter at DCA had the highest standard deviation since the winter of 1989-90, which came in at 11.1 degrees. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted March 9, 2016 Share Posted March 9, 2016 BWI's record highs today and tomorrow are about to get blown out if the forecasts verify. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted March 9, 2016 Share Posted March 9, 2016 High 82, low 40... that's a 42 degree spread. I wonder what the largest difference is ever recorded in one day? I feel like that's gotta be close? Link to comment Share on other sites More sharing options...
RodneyS Posted March 10, 2016 Share Posted March 10, 2016 High 82, low 40... that's a 42 degree spread. I wonder what the largest difference is ever recorded in one day? I feel like that's gotta be close? Not sure about Baltimore, but in DC the record one-day spread is 50 degrees -- March 22 1907, when the temperature range was 90/40. Link to comment Share on other sites More sharing options...
Ian Posted March 10, 2016 Share Posted March 10, 2016 Not sure about Baltimore, but in DC the record one-day spread is 50 degrees -- March 22 1907, when the temperature range was 90/40. I looked to 2000, has happened a few times. Most recently in 2011, April 4.. 43/86. Dulles actually has 5 above 50 but not that shocking for its location I suppose. 4/11/1977 87 33 54 4/3/1981 86 34 52 1/28/1987 35 -17 52 3/23/1994 83 32 51 4/18/1985 84 34 50 Link to comment Share on other sites More sharing options...
Subtropics Posted March 10, 2016 Share Posted March 10, 2016 I looked to 2000, has happened a few times. Most recently in 2011, April 4.. 43/86. Dulles actually has 5 above 50 but not that shocking for its location I suppose. 4/11/1977 87 33 54 4/3/1981 86 34 52 1/28/1987 35 -17 52 3/23/1994 83 32 51 4/18/1985 84 34 50 That -17 35 is the coolest one on that list IMO Link to comment Share on other sites More sharing options...
RodneyS Posted March 10, 2016 Share Posted March 10, 2016 I looked to 2000, has happened a few times. Most recently in 2011, April 4.. 43/86. Dulles actually has 5 above 50 but not that shocking for its location I suppose. 4/11/1977 87 33 54 4/3/1981 86 34 52 1/28/1987 35 -17 52 3/23/1994 83 32 51 4/18/1985 84 34 50 That -17 35 is the coolest one on that list IMO The temperature range at DCA that day was 7 to 32. So, the maximum was 3-degrees higher at IAD, but the minimum was 24-degrees lower. As previously mentioned on this thread, that is one of three times that there has been a 24-degree difference between the minimums at the two airports. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted March 10, 2016 Share Posted March 10, 2016 BWI's record highs today and tomorrow are about to get blown out if the forecasts verify. So both record highs did get broken. Record high min today is probably going to be broken too- it was 57 overnight, the record is 56 so as long as we hold it until midnight we're good. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted March 11, 2016 Share Posted March 11, 2016 Open question: are we headed for a March 2012 repeat? I see a lot of double digit departures in the forecast... Link to comment Share on other sites More sharing options...
MN Transplant Posted March 11, 2016 Author Share Posted March 11, 2016 Open question: are we headed for a March 2012 repeat? I see a lot of double digit departures in the forecast... No. Mar 2012 was a historic monster. Mar 2010, maybe. Link to comment Share on other sites More sharing options...
wxdude64 Posted March 11, 2016 Share Posted March 11, 2016 I looked to 2000, has happened a few times. Most recently in 2011, April 4.. 43/86. Dulles actually has 5 above 50 but not that shocking for its location I suppose. 4/11/1977 87 33 54 4/3/1981 86 34 52 1/28/1987 35 -17 52 3/23/1994 83 32 51 4/18/1985 84 34 50 That -17 35 is the coolest one on that list IMO Yes, literally.....lol. That is an amazing swing, usually it requires a spring/fall sun and dry air to create numbers like that. Link to comment Share on other sites More sharing options...
RodneyS Posted March 20, 2016 Share Posted March 20, 2016 Pretty interesting 2015-16 meteorological winter at DCA, as despite the blizzard and relative cold of January, the average temperature was 42.0 degrees -- good enough for an 8th place tie for warmest in DC history. The last Super El Nino, in 1997-98, was the 6th warmest DC winter at 42.4 degrees. However, that winter lacked the variability of this one, with a standard deviation from the average daily winter temperature of only 6.1 degrees, compared to 10.7 degrees this season. In fact, this winter at DCA had the highest standard deviation since the winter of 1989-90, which came in at 11.1 degrees. DCA astronomical (December 21-March 20) and composite (December 1-March 20) winters were even warmer, at 42.8 and 43.9 degrees, respectively. Those averages were good enough for a 5th place tie and 3rd place, respectively, all-time in DC. The comparable averages for 1997-98 were 42.5 and 42.4. The warmest astronomical and composite DC winters each occurred during a weak La Nina in 2011-12, at 45.9 and 45.6, respectively. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted March 28, 2016 Share Posted March 28, 2016 No. Mar 2012 was a historic monster. Mar 2010, maybe. I don't think I was that far off the mark. So far the departure at BWI is +6.7... Not as hot as March 2012 (+10.1), but certainly much hotter than March 2010 (+4.9). We're still in the running for a top ten hottest March (currently tied for 8th). Link to comment Share on other sites More sharing options...
wxdude64 Posted March 31, 2016 Share Posted March 31, 2016 For all the 'heat' talk this month (and I finished a +5.2 here), I find it amazing I am exactly even 0.0 for first three months of this year!?! 36.2/36.2 Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted April 1, 2016 Share Posted April 1, 2016 BWI finished tied for 6th hottest March (50.0 degrees, +6.4 departure). Did DCA or IAD make top ten? Link to comment Share on other sites More sharing options...
RodneyS Posted April 1, 2016 Share Posted April 1, 2016 BWI finished tied for 6th hottest March (50.0 degrees, +6.4 departure). Did DCA or IAD make top ten? Yes. DCA averaged 53.5 degrees, which was 4th all time -- 3.3 degrees cooler than March 2012. IAD averaged 50.6 degrees, which was 2nd all time -- 3.7 degrees cooler than March 2012. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted April 6, 2016 Share Posted April 6, 2016 Record low already set at BWI (24 so far). Previous record was 26 set in 1898. Link to comment Share on other sites More sharing options...
RodneyS Posted April 6, 2016 Share Posted April 6, 2016 Record low already set at BWI (24 so far). Previous record was 26 set in 1898. Dulles also recorded a low of 24 this morning, tying the record for April 6th set in 1966. Link to comment Share on other sites More sharing options...
RodneyS Posted May 1, 2016 Share Posted May 1, 2016 Final three days of April with maximums in the 50s at DCA marked the first time for anything like that since 1966, when the final four days had maximums ranging between 46-59. Link to comment Share on other sites More sharing options...
RodneyS Posted May 2, 2016 Share Posted May 2, 2016 Final three days of April with maximums in the 50s at DCA marked the first time for anything like that since 1966, when the final four days had maximums ranging between 46-59. Assuming that the temperature does not rise to 60 degrees before midnight, an all-time DC record will be set, with each day April 28-May 1 failing to reach 60. Link to comment Share on other sites More sharing options...
RodneyS Posted May 7, 2016 Share Posted May 7, 2016 I just posted this on the Capital Weather Gang board: " . . .11 straight days of measurable precipitation at DCA. .. According to my records, that sets the all-time DC record (back to 1871) for most consecutive days of measurable precipitation. I believe that the previous record was ten (twice: August 12-21, 1873 and July 17-26, 1938). During August 9-24, 1920, there were 16 straight days of at least a trace of precipitation, but only seven straight days of measurable." Link to comment Share on other sites More sharing options...
RodneyS Posted May 7, 2016 Share Posted May 7, 2016 That's incredible. What's the record at BWI? I don't know, but PrinceFrederickWx might. Link to comment Share on other sites More sharing options...
RodneyS Posted May 8, 2016 Share Posted May 8, 2016 I just posted this on the Capital Weather Gang board: " . . .11 straight days of measurable precipitation at DCA. .. According to my records, that sets the all-time DC record (back to 1871) for most consecutive days of measurable precipitation. I believe that the previous record was ten (twice: August 12-21, 1873 and July 17-26, 1938). During August 9-24, 1920, there were 16 straight days of at least a trace of precipitation, but only seven straight days of measurable." Early morning rain at DCA extends the DC record measurable precipitation streak to 12 days. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted May 8, 2016 Share Posted May 8, 2016 I don't know, but PrinceFrederickWx might. Nope, I don't know either, sorry! If famartin were still around I'm sure he would know... Link to comment Share on other sites More sharing options...
RodneyS Posted May 9, 2016 Share Posted May 9, 2016 Early morning rain at DCA extends the DC record measurable precipitation streak to 12 days. And late morning rain on Monday extends the streak to lucky 13. Link to comment Share on other sites More sharing options...
RodneyS Posted May 11, 2016 Share Posted May 11, 2016 And late morning rain on Monday extends the streak to lucky 13. DCA sneaked in 0.01 inch late last night, and has already recorded 0.12 inches this morning, so the measurable precipitation streak is now 15. Link to comment Share on other sites More sharing options...
PrinceFrederickWx Posted May 11, 2016 Share Posted May 11, 2016 BWI had measurable rain today already so that's 15 days with any rainfall (including Trace amounts). The record for that is 17 days, from 3/31/1935 - 4/16/1935. There was only a Trace on May 9 so the measurable streak ended then. If anyone from LWX is reading this, thanks for tracking the records in the Forecast Discussion page! Link to comment Share on other sites More sharing options...
RodneyS Posted May 11, 2016 Share Posted May 11, 2016 BWI had measurable rain today already so that's 15 days with any rainfall (including Trace amounts). The record for that is 17 days, from 3/31/1935 - 4/16/1935. DC has that very same record. I originally thought that the "any precipitation" record streak in DC was 16 (August 9-24, 1920), but I missed the 1935 streak. Link to comment Share on other sites More sharing options...
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