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The Weekend Rule? Saturday 2/17 - The Icon Storm


DDweatherman
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1 minute ago, Scarlet Pimpernel said:

Not a big fan of the "dual  maximum" look, but whatever...that's yet to be resolved.  I'm just glad to have a decent advisory-level event in the offing, and it now looks like it should stick around for a day and not torch on Saturday now.

Not 100% sure for DC south, even mby. If the 18z euro jumps north from 12z, I’m pulling the fire alarm on this

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12 minutes ago, stormy said:

The latest GFS doesn't like your ideas. Only .23.- .39

isn't .39 in the .35-.55 range?

eta: PSU wasn’t talking about forum-wide ranges.  He was saying if you could get qpf in your backyard to .4 to .5 then you can multiply by more than 10 and get 4-8” in places.  At least that was my take.

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1 hour ago, WVsnowlover said:

Strange that 10:1 is higher than Kuchera. Definitely looking like the potential is there for the biggest snow of the season for many.

Kuchera (as I understand it) is highly sensitive to the maximum temperature in kelvin in up to 500mb (Tmax below). I ran the calculation for DC for the Euro where the max temp is 273..15 in Kelvin (0 degrees C) during the height of the storm and that translates to 8.01 to 1 ratios using the Kuchera method. 

 

227751115_Screenshot2024-02-15172354.jpg.0a5672b4b411f07c18db10b07639f745.jpg

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5 minutes ago, paulythegun said:

Kuchera (as I understand it) is highly sensitive to the maximum temperature in kelvin in up to 500mb (Tmax below). I ran the calculation for DC for the Euro where the max temp is 273..15 in Kelvin (0 degrees C) during the height of the storm and that translates to 8.01 to 1 ratios using the Kuchera method. 

 

227751115_Screenshot2024-02-15172354.jpg.0a5672b4b411f07c18db10b07639f745.jpg

150% upside :)

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13 minutes ago, WesternFringe said:

isn't .39 in the .35-.55 range?

eta: PSU wasn’t talking about forum-wide ranges.  He was saying if you could get qpf in your backyard to .4 to .5 then you can multiply by more than 10 and get 4-8” in places.  At least that was my take.

Thanks but not worth it 

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8 minutes ago, paulythegun said:

Yeah it might be time to delete the thread and start a new one if that happens

:weenie:

Hopefully we may not need to. Ensembles on all models have been zeroing in on our sub and looking more stable. 

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So I have a flight out of DCA at 6am to Atlanta on Saturday.  I plan on parking on the top floor of short term parking, so will take a snow measurement from there (probably off someone’s car…I will be gentle, it’s for science).  Figure we can see whose snow measurements are better…the FAA’s or a met school dropout.  Stay tuned!

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7 minutes ago, Roger Smith said:

This won't shift north (of 18z GFS) and you'll get 2.5" to 4.5" (6" WV). 

in the mountains, sure—the winter storm warnings will go live tonight. but most of us don’t live there and will get 2-3”.

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Started a new job last week and have a data analytics class that’s taking up my time, so this system would be a nice bookend to a busy last few weeks in my world.

Side note…I’m hoping Richmond gets on the board to help my snowfall forecast.

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7 minutes ago, Wxtrix said:

in the mountains, sure—the winter storm warnings will go live tonight. but most of us don’t live there and will get 2-3”.

Nah. I think you will do better than that. 

My Final call:

3-5 for everyone in this subforum with 8 inch jacks in elevated areas. Maybe double digits up around Deep Creek. 

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WASHINGTON-FREDERICK MD-CARROLL-NORTHERN BALTIMORE-CECIL-

CENTRAL AND EASTERN ALLEGANY-NORTHWEST MONTGOMERY-

NORTHWEST HOWARD-NORTHWEST HARFORD-AUGUSTA-ROCKINGHAM-SHENANDOAH-

FREDERICK VA-PAGE-WARREN-CLARKE-RAPPAHANNOCK-NORTHERN FAUQUIER-

WESTERN LOUDOUN-EASTERN LOUDOUN-CENTRAL VIRGINIA BLUE RIDGE-

NORTHWEST PRINCE WILLIAM-MORGAN-BERKELEY-JEFFERSON-

600 PM EST THU FEB 15 2024

 

...WINTER STORM WATCH IN EFFECT FROM FRIDAY EVENING THROUGH

SATURDAY MORNING...

 

* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS OF 2 TO 4 

INCHES ARE MOST LIKELY, WITH THE POTENTIAL FOR LOCALIZED TOTALS OF 

UP TO 6 INCHES UNDER HEAVIER SNOW BANDS.

 

* WHERE...PORTIONS OF CENTRAL, NORTHERN, AND WESTERN MARYLAND, 

NORTHERN AND NORTHWESTERN VIRGINIA, AND EASTERN WEST VIRGINIA.

 

* WHEN...FROM FRIDAY EVENING THROUGH SATURDAY MORNING. THE STEADIEST 

SNOW IS MOST LIKELY FROM LATE FRIDAY EVENING THROUGH THE PRE-DAWN 

HOURS EARLY SATURDAY MORNING.

 

* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS. THE HAZARDOUS 

CONDITIONS COULD IMPACT THE FRIDAY EVENING COMMUTE WEST OF 

INTERSTATE 81.

 

* ADDITIONAL DETAILS...SNOWFALL RATES OF 1 TO 2 INCHES PER HOUR ARE 

POSSIBLE FOR A FEW HOURS OVERNIGHT FRIDAY NIGHT UNDER THE HEAVIEST 

SNOW BANDS. VISIBILITY MAY BE REDUCED TO LESS THAN ONE HALF MILE 

AT TIMES.

 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

 

MONITOR THE LATEST FORECASTS FOR UPDATES ON THIS SITUATION

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24 minutes ago, Terpeast said:

Hopefully we may not need to. Ensembles on all models have been zeroing in on our sub and looking more stable. 

Most years I’d be very nervous. But this year there really hasn’t been any north trend once inside 100 hours. The storms that did shift north all did it way before now. Under 48 hours the trend has been south really. Obviously every situation is different but the seasonal trend does matter some. 

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