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October Discobs 2024


JenkinsJinkies
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6 hours ago, WxUSAF said:

Low temps so far:

BWI 30F

IAD 33F

DCA 45F (lol)

 

Just 36F IMBY.  I'd expect first freeze at IAD with another 2 hours of cooling potentially.

 

eta...32F at IAD just after I posted this.

People will defend DCA to the death 

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1 hour ago, JenkinsJinkies said:

Perhaps placing your met temperature gage is a place that’s a giant plane of pure asphalt might skew the results…

Contributing factors to DCA’s temps are primarily the river temperature and the overall DC heat island.  The sensor isn’t that close to the runway.

The river temperature this morning was 58 degrees just upstream.

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2 hours ago, WEATHER53 said:

People will defend DCA to the death 

It doesn't need to be defended. The multitude of times it's been discussed has provided plenty of evidence that it's accurate to its local environment. The issue is people not understanding what that local environment consists of and causes in terms of microclimates. 

All you have to do is look at the dewpoints to see the river influence. Low dews last night:

IAD - 28

BWI - 30

DCA - 37

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26 minutes ago, TSG said:

It doesn't need to be defended. The multitude of times it's been discussed has provided plenty of evidence that it's accurate to its local environment. The issue is people not understanding what that local environment consists of and causes in terms of microclimates. 

All you have to do is look at the dewpoints to see the river influence. Low dews last night:

IAD - 28

BWI - 30

DCA - 37

Except that when the River is  frozen it still happens . When it’s snowing heavily throughout the entire area it still happens. When it’s quite windy it is much less in order on of 1-3 degrees because the air mixes  So something   g there is preventing both radiation and mixing and it’s not the river nor the GW parkway. Couple of local guys who live in apartments can’t mix or radiate either because they don’t have a lot fir  their equipment but rather a patio/balcony .  The thermometer at DCA Is accurate for  the 8’ by 8’ area which it occupies which is skewed.  50’feet away entirely different and Stan Rossen  deployed many thermometers in a test about 25 years ago and consistently measured 5-10 degrees cooler as close as200’ away 

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In my 45 year observation of DCA the discrepancy between it and BWI and Camp Springs and my station is as follows for spring, fall and winter.

Clear, windless night with average or lower humidity = +7 to +12.

Cloudy =+5 to +10 

Rain-=+4 to +8

Raging snowstorm=+3 to +4

Vey windy: 20 gusting  to 40 all night+2 to +3 ,

There are a lot of theories. . I have lived it for decades 
 

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BWI again 4 degrees colder than my station. For decades, my station's daily mins have routinely been 1 to 2 degrees colder than BWI. That all changed suddenly when Mr Freeze took up residence at BWI this month.
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34 minutes ago, astarck said:

34 :)

You could be right but here’s where I read it.

https://www.washingtonpost.com/weather/2024/10/29/no-rain-east-coast-dry-spell/#

Washington, D.C., had a soaking rainfall on Oct. 1, with 1.46 inches falling; the nation’s capital also got 0.02 inches the next day. That’s why the city hasn’t set a record yet. It has been 26 days without rain. Still, it marks Washington’s longest dry stretch since 2007, when there were a record 34 straight rainless days. The all-time record is 43 days, which happened in October and November of 2000.”

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2 hours ago, nw baltimore wx said:

I think what they meant to say was 2000 was incredibly dry overall. The month of October 2000 logged only 0.02 inches of rain and was the middle of a very long dry streak. In total, 0.02 fell across 43 days spanning September 26 to November 9. But officially, the longest streak without rain that year was 21 days.

Their reporting in this article would agree. https://www.washingtonpost.com/weather/2024/10/22/dc-dry-streak-drought-lanina/

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6 hours ago, nw baltimore wx said:

You could be right but here’s where I read it.

https://www.washingtonpost.com/weather/2024/10/29/no-rain-east-coast-dry-spell/#

Washington, D.C., had a soaking rainfall on Oct. 1, with 1.46 inches falling; the nation’s capital also got 0.02 inches the next day. That’s why the city hasn’t set a record yet. It has been 26 days without rain. Still, it marks Washington’s longest dry stretch since 2007, when there were a record 34 straight rainless days. The all-time record is 43 days, which happened in October and November of 2000.”

Dec 2000 was epic and it was a pretty active season for the Northeast. The March 2001 bust --yikes

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