Tuesday was a mostly sunny, colder, dry day, as flooding has reduced under critical limits in most of the region. High temps reached the low 40s in the mid-afternoon, after steady temps in the mid-upper 30s
overnight, then temps dropping to the low for the day just before midnight when temps fell into the lower 30s. Overnight tonight skies were clear and temps dropped into the mid-upper 20s as we approach sunrise.

The maximum temperature was 42.6° at 1540.

The minimum temperature was 30.8° at 2252.

Dew point temperatures ranged from a high of 27° @ 0140 down to a low of 23° @ 0535.

Relative humidity values ranged from a low of 47% @ 1545 up to a high of 76% @ 2255.

Barometric pressure ranged from a low of 30.00″ @ 0000 up to a high of 30.22″ @ 2115.

No rain or snow fell on Tuesday. December 2018 still has a total of 4.18″ of precipitation (liquid water equivalent). The year-to-date precipitation is still 62.99″. These amounts should remain stable till Thursday when yet another potentially very wet system moves in. Unfortunately snow is not in future forecasts for the foreseeable future through Christmas, so a White Christmas looks rather unlikely for our immediate area.

My current online data (except for rainfall/snowfall – use cocorahs link shown before for that dataset) is showing regularly on Weather Underground. My data is posted there every 5 minutes. My ID is KMDROCKV200 and my station is called “Gardens of Traville.” Data is online, normally just about in real-time now as it is being updated on a 5 minute interval. The web address for my data on weather underground is: https://www.wunderground.com/personal-weather-station/dashboard?ID=KMDROCKV200

I contribute my precipitation data daily to CoCoRaHS as Rockville 2.8 WNW, Station ID MD-MG-115 on https://www.cocorahs.org/

Please remember that Weather Underground precipitation data reflects what is recorded automatically through the tipping bucket VP2 gauge, just as it does on WxLink 2.0. The tipping bucket is producing erratic values so should not be used save for general precipitation timing. For example on Saturday it recorded 5.62″ for the day, clearly a significantly higher amount when compared to my 4 inch gauge total that day (3.24″). I actually use the data I post to CoCoRaHS from my 4 inch CoCoRaHS gauge I read manually as my “official” precipitation total each day.

Wednesday should be partly cloudy with high temps in the upper 40s and lows in the low 30s.

Thursday will turn cloudy with a 100 POP for PM rain, temperatures remaining steady in the mid-upper 40s most of the day.

Friday should warm up to highs around 60° with a low in the upper 30s under cloudy, rain showery (70 POP) skies. There’s another chance for flooding rains with this system.

Saturday will dry out and cool off with partly cloudy skies, highs in the mid 40s, lows around freezing.

Sunday will be mostly sunny with highs in the upper 40s and lows in the mid 30s. 

Tuesday’s midnight observations included a temperature of 33.5°, relative humidity 69%, barometric pressure 30.20″ and steady, with a dew point of 24.4° under clear skies.

Currently at 0659 the temperature is 27.1°, dew point temperature 24°, relative humidity 88%, and barometric pressure at 30.22″ and steady under clear skies. During the overnight, temperatures dropped through the lower 30s into the mid 20s towards sunrise.

Good morning from the Walrus on this clear Wednesday.