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12th Annual Mid-Atlantic Snowfall Contest


RodneyS
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Yesterday IAD added another 0.1 inch of snow with just a trace of precipitation.  The situation at BWI is murky because both February 6th and 7th also show a trace of precipitation there, but the snow totals for each day are listed as "MM" -- indicating that data are missing. 

image.thumb.png.38cf35fa409d922a83718c2630584c9f.png

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If the GFS is right, almost everyone now in contention for the best forecast will be in the lead for five minutes and hand off to the next person. Only the last two forecasts in the table would have anything left to use up by the end of the storm. 

If a more conservative outcome is in play, the lead will change to somewhere near my entry. So I feel like I can't lose, either my contest improves, or I get to see the excitement of a major storm unfolding. Win-win. 

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19 hours ago, Roger Smith said:

If the GFS is right, almost everyone now in contention for the best forecast will be in the lead for five minutes and hand off to the next person. Only the last two forecasts in the table would have anything left to use up by the end of the storm. 

If a more conservative outcome is in play, the lead will change to somewhere near my entry. So I feel like I can't lose, either my contest improves, or I get to see the excitement of a major storm unfolding. Win-win. 

Your moment may be at hand, Roger, because you are the closest entrant to the lead who still has all positive departures. However, you need to watch your back, with @mappyin position to pick up on you if BWI's total exceeds three inches.  

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13 minutes ago, Cobalt said:

Dang, was banking on BWI getting into the Western edge of a late-developing storm like they did in March 2018. Yesterday was the chance, but the window just passed.

Another 0.7 at BWI would have put you in the lead, but it still can happen.  

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Snow totals for March 2nd were:  BWI 1.0, DCA 0.8, and IAD 0.4.

Those numbers eliminate several entrants from winning -- in fact only six (in black) of the top 18 remain in contention. @Chris78maintains a narrow lead over @Cobaltwith @Roger Smiththe highest ranking entrant with all positive departures at the four airports. 

image.thumb.png.01ada23f71a49d2e76ffab8f208fada4.png

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3 hours ago, Cobalt said:

The one time I need DCA to put up a pitiful early March daytime measurement..

Yup, the snow gods had some fun with you yesterday. The 0.4 at IAD was reported yesterday afternoon, but this morning we woke up to find that was it there, whereas DCA checked in at 0.8.  :o  However, another 0.5 at BWI could still win it for you. :snowman:

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Quite a day in the Mid-Atlantic -- from summer in the early morning to winter in the late morning. That resulted in the following snow totals today: BWI trace, DCA 0.1, IAD 0.6, and RIC 2.0.

As a result, our forecasting guru @Roger Smithis the new leader. 

image.thumb.png.6235a57f809af9b0882013d28dde7edd.png

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3 hours ago, RodneyS said:

Quite a day in the Mid-Atlantic -- from summer in the early morning to winter in the late morning. That resulted in the following snow totals today: BWI trace, DCA 0.1, IAD 0.6, and RIC 2.0.

As a result, our forecasting guru @Roger Smithis the new leader. 

image.thumb.png.6235a57f809af9b0882013d28dde7edd.png

Son of a bi...

Not only did I screwed again up here in Northern MD with no snow but I got screwed with the contest too.  Lol.

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30 minutes ago, Chris78 said:

Son of a bi...

Not only did I screwed again up here in Northern MD with no snow but I got screwed with the contest too.  Lol.

I was looking at @Cobaltas your biggest threat, but BWI seemed to be in a snow hole today while RIC hit the jackpot.

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FYI, yesterday's DCA snow amount was upgraded from 0.1 to 0.2 inch. Also, yesterday's BWI snow amount is now listed as "missing" rather than a trace, which could mean that amount is being reevaluated.

See revised table below:

image.thumb.png.cd85d97174bd77c51067157e1c43e86a.png

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5 hours ago, 87storms said:

I just need an advisory level slushfest in Central MD.  Still seems possible in this winter.

FYI, this winter thus far has two interesting parallels to the winter of 1989-90 in the Mid-Atlantic.

(1) A major consecutive day streak in which the maximum temperature failed to reach the freezing mark at DCA:

December 16-25, 1989 and January 24-February 1, 2026

(2) A March mini heat wave in which the maximum temperature soared way above normal at DCA:

March 12-16, 1990 maximums were 89, 87, 86, 81 and 81 and March 8-12, 2026 maximums were 76, 76, 84, 86, and 78

So, what happened right after the March 1990 mini heat wave?

Several minor snow events between March 20-April 7, 1990 totaling 0.2 inches at RIC, 2.6 at DCA, 2.8 at BWI, and 10.4 at IAD.                            

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7 minutes ago, RodneyS said:

FYI, this winter thus far has two interesting parallels to the winter of 1989-90 in the Mid-Atlantic.

(1) A major consecutive day streak in which the maximum temperature failed to reach the freezing mark at DCA:

December 16-25, 1989 and January 24-February 1, 2026

(2) A March mini heat wave in which the maximum temperature soared way above normal at DCA:

March 12-16, 1990 maximums were 89, 87, 86, 81 and 81 and March 8-12, 2026 maximums were 76, 76, 84, 86, and 78

So, what happened right after the March 1990 mini heat wave?

Several minor snow events between March 20-April 7, 1990 totaling 0.2 inches at RIC, 2.6 at DCA, 2.8 at BWI, and 10.4 at IAD.                            

I don’t want prolonged cold weather, but for the sake of competition, I’m open to a hot vort that slides through southern/central Va with a transient hp overhead.

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On 3/13/2026 at 9:57 AM, RodneyS said:

FYI, yesterday's DCA snow amount was upgraded from 0.1 to 0.2 inch. Also, yesterday's BWI snow amount is now listed as "missing" rather than a trace, which could mean that amount is being reevaluated.

 

 

The reevaluation has now been completed and is just what the doctor ordered for @Cobalt. BWI's Thursday snow total has been revised from a trace to 1.0 inch, which makes perfect sense -- the hourly observations there on Thursday listed "heavy snow" and a temperature of 33.1 degrees at 13:54 and "light snow" and that same temperature at 14:54, with precipitation during those two hours totaling 0.19 inches. An inch of snow therefore translates into a snow/precipitation ratio of 5.3, which is reasonable with a wet snow. On the other hand, only a trace of snow with those hourly observations would have been close to impossible.

So Cobalt is our new leader, but @Roger Smithremains in strong condition; see below.

image.thumb.png.f4ef66ddcc8b688ec4f41fb4eb74e912.png

 

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On 2/20/2026 at 6:26 PM, Roger Smith said:

If the GFS is right, almost everyone now in contention for the best forecast will be in the lead for five minutes and hand off to the next person. Only the last two forecasts in the table would have anything left to use up by the end of the storm. 

If a more conservative outcome is in play, the lead will change to somewhere near my entry. So I feel like I can't lose, either my contest improves, or I get to see the excitement of a major storm unfolding. Win-win. 

So saddened to just learn that Roger left us at age 76 four days after this post. He had many forecasting highlights in his life, including nailing with his AccuWeather colleagues the Presidents Day Storm of February 18-19, 1979. And he made his last appearance in this contest his best, as he is currently in 2nd place with a realistic chance to win it.  :cry:

https://www.americanwx.com/bb/topic/62666-roger-smith-rip/page/2/#comment-8066399

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