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DownpourDave

Meteorologist
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Posts posted by DownpourDave

  1. 51 minutes ago, mattie g said:

    But it’s not at all unheard of for us to get 2-3” of QPF during a big southern stream storm in a Nino.

    I get that warmer air can hold more moisture, but that doesn’t mean we can’t pick up copious precip during cold storms given the right conditions.

    And please…I’m all ears to hear why I might be mistaken!

    You’re right that you can, my point is it is harder. The answer is a bit complicated.

     

    Part of the answer is in the physical process of rain and snow formation and how fast they fall.

     

    Rain forms through liquid droplets coalescing in the atmosphere creating larger and heavier droplets that can fall quicker under the force of gravity

     

    Snowflakes form when water vapor turns directly into ice crystals. 
     

    Snowflakes form at a slower rate than rain droplets and obviously the structure is different with air pockets within the snow flake causing them to be lighter than rain drops.

    Thus,
     

    Rain can physically fall at a faster rate than snow and rain forms at a faster rate.

     

    This explains it better.

     

    https://geo.libretexts.org/Bookshelves/Geography_(Physical)/The_Physical_Environment_(Ritter)/07%3A_Atmospheric_Moisture/7.04%3A_Clouds_and_Precipitation/7.4.03%3A_Precipitation_Process

    Bergeron Process vs Warm-Rain Process 

    Now assuming that one is dealing with the Bergeron Process for areas that get rain and areas that get snow, rain will still fall at a faster rate due to structure differences between a snow flake vs rain drop.

    • Like 2
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  2. 2 hours ago, Scraff said:

    Imagine that QPF at the right temps. OMG. :snowing:

     No need to imagine, the way thermodynamics work, it wouldn’t be that QPF if it were snow.

     

    It is why you can get 3 inches of rain per hour but not 30 inches of snow per hour. It doesn’t work like that.

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  3. 30 minutes ago, NJwx85 said:

    This is probably already a hurricane. Just don't have recon to confirm so still going off satellite estimates. 

    Quote
    000
    NOUS42 KNHC 052054
    REPRPD
    WEATHER RECONNAISSANCE FLIGHTS
    CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
    0455 PM EDT TUE 05 SEPTEMBER 2023
    SUBJECT: TROPICAL CYCLONE PLAN OF THE DAY (TCPOD)
             VALID 06/1100Z TO 07/1100Z SEPTEMBER 2023
             TCPOD NUMBER.....23-098 AMENDMENT
    
    I.  ATLANTIC REQUIREMENTS
        1. NEGATIVE RECONNAISSANCE REQUIREMENTS.
        2. OUTLOOK FOR SUCCEEDING DAY:
           A. BEGIN 6-HRLY FIXES ON TROPICAL STORM LEE AT 07/2330Z.
           B. NOAA 43 P-3 TAIL DOPPLER RADAR MISSION INTO LEE FOR
              08/1200Z, DEPARTING TISX AT 08/0800Z.
           C. (ADDED) POSSIBLE USAF RESERVE WC-130J SYNOPTIC SURVEILLANCE
              MISSION AROUND TROPICAL STORM LEE FOR 08/0000Z.
    
    II. PACIFIC REQUIREMENTS
        1. NEGATIVE RECONNAISSANCE REQUIREMENTS.
        2. OUTLOOK FOR SUCCEEDING DAY.....NEGATIVE.
    
    $$
    SEF
    
    NNNN

    Looks like reconnaissance on Lee will begin tomorrow 07/2330z. 

    • Like 1
  4. 31 minutes ago, dendrite said:

    Long, cold, and dark. CAD reigns supreme. Don't expect any blockbuster events unless a deformation band somehow makes it up there and rots.

    I was hoping it would be a little bit snowier than Geneva in the Finger Lakes region of NY. I am a skier so I am hoping for enough snow for that! 
     

    I did hear there are many great ski resorts near where I am.

  5. 2 hours ago, blackhound said:

    In Glen Mills not far from Cheyney Road. All that happened on our property was the patio table was picked up and tossed onto the vegetable garden fence. Fence survived as did the tomatoes. 

    But it's a mess around here. One of our neighbors had a tree come down on their house. No surprise the power is still out. Roads closed all over the place. PECO estimate is 11PM tonight. That would be lucky.

    Near S concord  road and Brinton lake road IMG_4057.thumb.jpeg.c4b6f01c78fa71bc6061f6be90dfb04d.jpegIMG_4059.thumb.jpeg.0b6afc434580a1e035436fa36266ada7.jpeg

    • Like 3
  6. On 4/30/2022 at 3:40 PM, yoda said:

    Monday's highs 60-65... and then someone ordered the wedge sandwich for next Tuesday on the 12z GFS too :lol::axe:

    gfs_T2m_neus_42.png

    kinda looks like cold air damming. 

  7. 24 minutes ago, DeltaT13 said:

    Wow. You’d rather ski hard pack ice than powder, and miss an awesome storm solely because you don’t want to drive in a little snow. What in the world is going on here.  Move to florida. Haha

    My car is shit in the snow. The smallest amount on the roads and I am sliding like crazy. As long at the storm ends before I plan on hitting the road to drive(around 4PM on Saturday), I should be fine. Obviously I would love to ski in powder, just wish the timing of the storm was better. 

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