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12/17 Messy Mix - Observations/Nowcast


Baroclinic Zone
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  On 12/17/2019 at 6:58 PM, The 4 Seasons said:

Ryan has been posting on Twitter continual updates of ZR accumulation at KHVN. Does anyone know how to get updated ice accretion at the airport ASOS stations? The PNS statements are old, from 9:29AM

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You can add up the “I” column in the metar. But I think oceanst said be careful because it measures on flat surface and real accretion on surfaces like wires and trees does not work like that.

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  On 12/17/2019 at 6:58 PM, The 4 Seasons said:

Ryan has been posting on Twitter continual updates of ZR accumulation at KHVN. Does anyone know how to get updated ice accretion at the airport ASOS stations? The PNS statements are old, from 9:29AM

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Raw METARs. 
 

0.16” last 6hrs

METAR KHVN 171753Z 02007KT 4SM UP BR OVC011 01/M01 A2974 RMK AO2 RAB01E11 SLP069 P0003 60020 I6016 T00061006 10006 21006 56045
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  On 12/17/2019 at 7:00 PM, CoastalWx said:

You can add up the “I” column in the metar. But I think oceanst said be careful because it measures on flat surface and real accretion on surfaces like wires and trees does not work like that.

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Pretty sure it’s just an algorithm off of the ZR sensor. 

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  On 12/17/2019 at 7:02 PM, dendrite said:

Raw METARs. 
 

0.16” last 6hrs

METAR KHVN 171753Z 02007KT 4SM UP BR OVC011 01/M01 A2974 RMK AO2 RAB01E11 SLP069 P0003 60020 I6016 T00061006 10006 21006 56045
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KTAN 171752Z AUTO 01003KT 3SM -RA BR BKN004 OVC008 01/M01 A2978 RMK AO2 SLP083 P0007 60029 I6013 T00111006 10011 21017 56055

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  On 12/17/2019 at 7:23 PM, The 4 Seasons said:

I'm ignorant here..help me out... I thought that was just total liquid that has fallen in the last hour/3hours/6hours whatever and not nessisarily ice acrettion due to factors like run off, temperature, expansion of water, etc etc....

HVN, for example is also reporting a mixture of UP and ZR, so there could be times of sleet mixing in as well. Not sure about HVN but here there was ZR then IP then back to ZR 

Just trying to figure out a valid method of reporting ice totals

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The I groups are 1,3,6 hr accretion. The regular P and 6 groups are 1,3,6 hour pcpn. 

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  On 12/17/2019 at 7:29 PM, The 4 Seasons said:

yes, sorry, i just figured that out. Didn't notice it was an "i"

Can you provide a good link for metars so i can take a look at them around CT?

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I just use this or the texas a&m weather interface site. 
http://uswx.com/uswx/text.php?q=03276&h=24&stn=KHvn

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  On 12/17/2019 at 7:31 PM, HIPPYVALLEY said:

Schizophrenia storm.  Rates change every 10 minutes.

Tiny ice pellets now, that will not be great on the roads.  27F

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I've been keeping an eye over the ALB area on radar as that's the stuff that will get here and that seems to have filled in and looks to be blossoming some too.

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