Rainy start, some patchy fog, to drying but mostly cloudy midday, afternoon..few peaks of sun….mid afternoon showers. Bittinger 2nw Valley 4pm downpour. To another dry period with period of rain nightfall, thereafter.
Temp profile this afternoon
Radar with 24hr estimates…Estimates seem high in spots vs obs…. I picked up .3 at Bittinger 2nw Valley through 6pm, Spruce Knob was over 1″ daily, Cabin at Bald Knob .86 daily.. so estimates look off
Satellite
Flow
Surface features and 500mb height anomalies and flow
Cloudy, some fog, morning rain, then mainly cloudy with some breaks of sun early afternoon to a heavy period of rain around 4pm….then some lighy rain later evening
Temp profile this afternoon
Radar with estimates. I picked up .6 today at Bittinger 2nw Valley with the brunt of that with the 4pm burst
Satellite, at various times as it had some opetational issues today
Flow
Surface features and 500mb height anomalies and flow
Cloudy, some high ground fog, east flow…clouds held tough in the traditional cooler east flow locations. Breaks elsewhere..Heavy period of rain after 4pm.
Temp profile this afternoon
(July Summary at page bottom)
Radar with estimates I picked up .9 at Bittinger 2nw Valley, Garrett College also at .9
Satellite this afternoon
Flow
Surface features and 500mb height anomalies and flow
Heavy downpours before dawn in spots then a steadier rain mid morning into the afternoon. Skies broke a little towards evening. Wv high ground ran a rain cooled mid 50s for part of the afternoon.
Temp profile this afternoon
Radar and estimates..picked up .7 today at Bittinger 2nw Valley
Satellite this afternoon
Flow
Surface features and 500mb height anomalies and flow
Mostly clear to start, more cloudiness wv mts vs north, valley fog widespread. The day much like yesterday had building clouds and at times skies were mostly cloudy. A few showers along the Allegheny Front and southern Alleghenies.
Temp profile this afternoon
The Glades under mainly clear skies bottoming out at 38.2°
Radar and radar estimates through 8pm
Satellite this afternoon
Flow
Surface features and 500mb height anomalies and flow
Mix of clouds and sun to start, quickly clouding over. A period in the afternoon with a line of passing light showers. That passed and skies broke….after dusk, a few more brief passing showers pushed through parts of the area(snippet of that below radar estimates)
Temp profile this afternoon
Radar with radar estimated precip
Satellite this afternoon
Flow
Surface features and 500mb height anomalies and flow
18Z 3km Nam
2m Temperatures
Dew Points
Simulated Radar
10m Winds
Cloud Cover Percentage
12Z ECMWF
Next week model indicating ridge backing in from the east. This “may” for a time shift the precip shield over the Alleghenies that has overall missed out on appreciable precip over the past 7 days and in some areas, the month.
12Z ECMWF 6 hourly precip
500mb heights and anomalies
2m Temperature anomalies. Likely a setup of cloudy afternoons with some periods of rain holding temps slightly below normal for maxes, and cloud cover, holding temps at or above at night
Dreary looking start, some fog, low clouds and that then burnt off for a mix of clouds and sun of varying amounts from late morning, through evening with the sunny side of things increasing as the day went by.
Temp profile this afternoon
Satellite this afternoon
Radar, mostly last evening in where it did rain, with 24 hour estimates running back to 7pm 7/25
Flow
surface features and 500mb height anomalies
500mb flow
SST(Sea Surface Temperature) anomalies and 7 day change
Off The Models
Meteogram off the 12z ECMWF for Garrett County
12Z ECMWF
3 hourly precip
Total Precipitation
18z GFS
6 hourly precipitation
Total Precipitation
18Z 3km Nam
2m Temperatures
2m Dew Points
Simulated Radar
Total Precipitation
10:30pm reality, model comparison
The new 0z 3km Nam run is in. So thats the go to choice. The formula I’v been watching, to get a good feel for what the cold frost pockets can achieve is
1- 10m wind off the 3km Nam calm. In this case, we can check that off. At least for the valley spots. While 3km is high res, its still not tight enough to pinpoint details, but gives great hints.
2- Cloud cover, are we seeing clear skies. The 3km nam does very well at this. In this case, checked this off.
3- 2m Dewpoints. Pretty big component. Again, 3km nam is detailed, but not tight enough for minute details. The observations and comparisons has led to the conclusion on many many occasions, that, with a dry air mass incoming, or in place, calm winds, clear skies, subtract 4-8° from the 3km nam modeled dewpoint and that is generally where the 2m temp comes in at in the cold pockets. Placement of the modeled 2m Dewpoints is not important. If conditions above(1&2) check off the list. Ex. If the models lowest dewpoint is in Elkins at 45 and Canaan reads 55 on the model, Canaans frost pocket actual dewpoint, air temp, if conditions(calm, clear)of 1 and 2 are equal to Elkins, (on the model) reality should run 38-42° 2m air temp. In the case below off tonights 0z 3km nam, 56.2° dewpoint is the min at the example time. All in all for this example, lowest dewpoints are in the ballpark area of the conversation, despite it doesn’t have to be.
4- While in cases of east flows, CAD events, even daytime maxes with a breeze I love the 3km nam, (best there is bar none, beats HRRR easily) it is not good at hitting cold pockets. Again, not in tight enough for small details even at 3km, but I would think as in the current case, and many other times observed, it should do better. With 0 wind, 56° dewpoint, clear skies, why is it not modeling pockets of cooler temps? 3km should be enough to do that. This aspect of the model is one of its problems on 2m temps. Its not always great at convective storms and will falsely on the model cool locations that do not occur. That’s another downfall. It is though great for frontal timing however. Currently, thumbs down for tonights example on temps. Way to warm.
Reality views. While the valley frost pocket has no anemometer, its evident conditions are calm, while at 4000′ a 10mph exist. The model, looks decent. At 4000 its 63°, not bad on the model, 51° in the colder valley area, no clue on the model, except using the 1,2,3 formula from observations of the model to reality.
Reality at a little past 10:30pm
(To note, Hrrr last night showed clear skies through daybreak, 3km nam showed increasing cloud cover and temps creeping up, 3km Nam did well.)