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Feb. 23-25th Winter Storm Part 2


Chicago Storm

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how many different criteria are there

Depends on the region....whopps scratch that....guess they changed that....just caught a revision since I interned in 02....listed below are the definitions for ALL WINTER WARNING CRITERIA....start looking after page 5.

http://www.nws.noaa.gov/directives/sym/pd01005013c022003curr.pdf

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Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI

424 PM EST THU FEB 24 2011

MIZ076-082-083-250615-

/O.UPG.KDTX.WS.A.0003.110225T0400Z-110225T1600Z/

/O.NEW.KDTX.WS.W.0004.110225T0700Z-110225T1600Z/

WAYNE-LENAWEE-MONROE-

INCLUDING THE CITIES OF...DETROIT...ADRIAN...MONROE

424 PM EST THU FEB 24 2011

...WINTER STORM WARNING IN EFFECT FROM 2 AM TO 11 AM EST FRIDAY...

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

WINTER STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 2

AM TO 11 AM EST FRIDAY. THE WINTER STORM WATCH IS NO LONGER IN

EFFECT.

IMPACTS...

* ROADS WILL BECOME SNOW COVERED FOR THE FRIDAY MORNING RUSH

HOUR.

* ROADWAYS WILL BE SLICK WITH SLOW AND HAZARDOUS CONDITIONS

EXPECTED DURING THE PEAK TRAVEL TIME.

HAZARDOUS WEATHER...

* SNOW WILL DEVELOP AFTER MIDNIGHT TONIGHT...BECOMING HEAVY AT

TIMES BY EARLY FRIDAY MORNING. THE SNOW IS EXPECTED TO TAPER

OFF DURING THE MID MORNING HOURS AND END AROUND 11 AM.

* TOTAL SNOWFALL ACCUMULATIONS OF 3 TO 6 INCHES ARE EXPECTED OVER

A SHORT DURATION. THE BULK OF THE SNOWFALL WILL OCCUR BETWEEN 3

AM AND 9 AM.

* VISIBILITIES WILL BE RESTRICTED BELOW A HALF MILE AT TIMES IN

FALLING AND BLOWING SNOW. SNOWFALL RATES MAY EXCEED ONE INCH

PER HOUR AT TIMES.

* NORTHERLY WINDS WILL INCREASE LATE TONIGHT WITH GUSTS TO 30 MPH

CONTINUING INTO FRIDAY MORNING.

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Winter Storm A snow accumulation of at least 5 inches in 6 hours, in combination with one of the following: rain, freezing rain, sleet, wind, blowing snow or cold (wind chill). Per DTX web page

http://www.crh.noaa....nitions/wsw.php

Thanks Sparty....couldn't find that link....and when I saw the map from Central Region I thought maybe it wasn't updated....thought they had updated it but it's been a few years since I was an intern.

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1" per hour snow at MCI in the past 2 hours. Looks like 6.0-6.5" amounts being the top in the EAX CWA so far.

METAR KMCI 250153Z 01015KT 1/4SM R19R/2200V3500FT +SN FZFG BKN001 OVC008 M03/M03 A2992 RMK AO2 PK WND 02027/0137 SLP139 SNINCR 1/4 P0006 T10281033 $

METAR KMCI 250253Z COR 36014KT 1/4SM R19R/4000VP6000FT +SN BR BKN003 OVC008 M03/M03 A2995 RMK AO2 SNINCR 1/5 SFC VIS 3/4 SLP150 P0014 60027 T10281033 51021 $

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Depends on the region....whopps scratch that....guess they changed that....just caught a revision since I interned in 02....listed below are the definitions for ALL WINTER WARNING CRITERIA....start looking after page 5.

http://www.nws.noaa....c022003curr.pdf

Question (not specifically at you. Anyone can answer): why is the territory covered by a given NWS WFO frequently incongruous with the state boundaries? For example, wouldn't it make more sense to have the bottom tier in MI under GRR's jurisdiction?

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Question (not specifically at you. Anyone can answer): why is the territory covered by a given NWS WFO frequently incongruous with the state boundaries? For example, wouldn't it make more sense to have the bottom tier in MI under GRR's jurisdiction?

Maybe Ocean if he is on can answer, but from what I remember when I interned that issue is related to radar coverage....basically the radar can't "effectively" see beyond 150 miles for warning purposes....I could be wrong since it has been a while (until I begin as an employee in less than 3 weeks) but from what I remember back then that is how it was decided/explained to me.

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Nothing is reaching the ground in Northern Indiana

No surprise there as in this type of setup in the deformation area with the dry air feed it usually takes about 2 to 4 hours of returns to saturate the column depending on the depth/degree of dry air, strength of forcing, slantwise instability potential, static stability, omegas, etc. Once you see the "doughnut hole" then you know you're getting close.

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GFS just a steaming pile and was still showing me getting 1-2" at 12z while the euro continued its cutting back on the north side of the system from last night to basically nothing at 12z. Euro might have been to far north but even the GFS caved to it almost after it was lost south and east for days on end. Sounds like all systems go down in LAF with rain changing to a heavy plastering as we thought :thumbsup: Good luck to all in the systems path.. What a almost perfect share the wealth winter - love it.

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Thanks Sparty....couldn't find that link....and when I saw the map from Central Region I thought maybe it wasn't updated....thought they had updated it but it's been a few years since I was an intern.

I thought they got rid of heavy snow warnings? Think that link needs to be updated but the WSW criteria is the same. As far as this system is concerned, with the 5-6 decent systems we have had this year dry air really wasn't much of a problem. They have all been pretty cold systems too with very little rain. I have noticed over the years that these wetter warmer systems have a harder time of overcoming dry air to the north more than the colder systems. I thought it would be the other way around.

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You think this storm is a flat out miss for DTW? Wow...

I don't think it will be a miss....I haven't been on here or looking at data long as I have been reading training material for my new job....but just quick glancing at the data for our area I can see something like 2.4 at PTK...3.5 at Troy....4.2 at metro 5.1 SE part of Wayne County to about 6.0 at Temperance.

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