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3/5/2015 Ice/Snow Event


Coach McGuirk

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I don't see much evidence of that unless the 0z run was noticeably warmer or something. . Comparing the actual observed 12z soundings vs the 06z nam 6 hour soundings an LWX, they look very very similar.

 

I'm sure you're right, I was just going by what I read in the MA forum by a couple fairly reputable posters. I didn't check the DC area soundings myself. I think they were just expecting a longer period of sleet than what they observed. I doubt it has any bearing on what we can expect in the south.

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This sure has had the forecasters stumped. Originally, it was supposed to rain yesterday (I cancelled a Dr. Appointment for my wife based on forecast). Was supposed to rain last night. Was supposed to rain "after 8:00 AM this morning" (They definitely will get that one right, but no rain yet).

 

Now I'm wondering with the much later arrival of precipitation, if that will increase the potential of overnight frozen mess?

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This sure has had the forecasters stumped. Originally, it was supposed to rain yesterday (I cancelled a Dr. Appointment for my wife based on forecast). Was supposed to rain last night. Was supposed to rain "after 8:00 AM this morning" (They definitely will get that one right, but no rain yet).

 

Now I'm wondering with the much later arrival of precipitation, if that will increase the potential of overnight frozen mess?

 

Interesting indeed, they have it over by 11pm here tonight and we don't go frozen till 7pm according to NWS but I suspect there will be IP in it pretty quick and we might be all sleet longer than forecasted.....I don't care though if we can just get it to snow for a few hrs at the end for a dusting that's all I wanna see....

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Good call, Jon. We should never expect cold air to get in here quicker than forecast. It's always slower. Thought maybe since it was coming from the north, the usual hold-up, the mountains, would not be a problem and it would make it in here quicker. Welp, no. Another example of why you should always go with the warmest model and the least wintry solution...and then it's probably best to even cut that down.

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Good call, Jon. We should never expect cold air to get in here quicker than forecast. It's always slower. Thought maybe since it was coming from the north, the usual hold-up, the mountains, would not be a problem and it would make it in here quicker. Welp, no. Another example of why you should always go with the warmest model and the least wintry solution...and then it's probably best to even cut that down.

Well we just dropped below 40 here in Hillsborough so......

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Update from NWS Raleigh:

 

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1045 AM THURSDAY...

LOW LEVEL COLDER AIR TAKING ITS TIME ADVECTING SOUTH INTO CENTRAL
NC. THIS HAS RESULTED IN TEMPS RISING TO LEVELS NEAR OR SLIGHTLY
ABOVE FORECAST HIGH TEMPS SO HAVE ADJUSTED MAX TEMPS UP SEVERAL
DEGREES...ESPECIALLY ACROSS THE SOUTH.

SFC COLD FRONT CURRENTLY DROPPING SLOWLY SOUTH ACROSS THE NORTHERN
PIEDMONT. 13Z SFC ANALYSIS DEPICTS A WEAK WAVE ON THE FRONT BETWEEN
ASHEVILLE AND HICKORY. AS THIS WAVE LIFTS TO THE EAST-NORTHEAST LATE
THIS MORNING/EARLY AFTERNOON...SHOULD SEE FRONT RESUME A MORE
CONSTANT SEWD MOVEMENT ACROSS THE REGION.

12Z UPPER AIR ANALYSIS ALONG WITH THE 13Z SFC ANALYSIS SUGGEST THAT
THE SFC CHANGEOVER FROM RAIN TO A WINTRY P-TYPE COINCIDES FAIRLY
CLOSE TO THE 850MB 0 DEG C ISOTHERM. BASED ON LATEST MODEL
GUIDANCE...THIS 850MB FEATURE WILL BE JUST NORTH OF OUR CWA AT
18Z...AND ALONG A ASHEBORO-DURHAM-HALIFAX LINE AT 00Z. THUS...THE
CHANGEOVER TO WINTRY TYPE PRECIP WILL LIKELY OCCUR DURING THE
EVENING RUSH HOUR IN THE TRIAD REGION...AND BASICALLY NORTH OF THE
TRIANGLE DURING THE SAME TIME FRAME. EXPECT CHANGEOVER TO FREEZING
RAIN/SLEET MIX TO PROGRESS SOUTH INTO THE TRIANGLE AND AREAS EAST OF
THE TRIANGLE NEAR OR JUST AFTER SUNSET...AND AREAS IMMEDIATELY SOUTH
OF HIGHWAY 64/264 BY EARLY EVENING.

TONIGHT...PRECIP WILL DIMINISH WEST-TO-EAST WITH BULK OF PRECIP EAST-
NE OF OUR AREA SHORTLY AFTER MIDNIGHT. TEMPS WILL CONTINUE TO FALL
AND SHOULD RANGE FROM THE LOW-MID 20S NORTH TO THE UPPER 20S/AROUND
30 SOUTH. THIS COLD AIR WILL CAUSE ANY MOISTURE LEFT ON THE ROADS TO
FREEZE INTO A THIN LAYER OF ICE WITH THE BRIDGES/OVERPASSES/RAMPS
THE FIRST TO EXPERIENCE THE SLICK CONDITIONS. THUS...THOUGH THE
ADVISORY IS SET TO EXPIRE AT MIDNIGHT...MAY NEED TO ISSUE ANOTHER
ADVISORY (OR EXTEND THE CURRENT ADVISORY) TO ACCOUNT FOR THE BLACK
ICE. WITH TEMPS EXPECTED TO REMAIN BELOW FREEZING UNTIL 11 AM OR
NOON...THE MORNING COMMUTE MAY BE A DIFFICULT/HAZARDOUS.

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Temp went from 68 to 56 in about 10 minutes..wow. Didn't expect to see that fast of a drop here..although a band of pretty heavy rain came through at about the same time so that probably helped. Similar drop in observations just south of athens. Averaging a degree per minute lol

11:05	57.7	54.8	90		OK	0.02
11:00	62.7	60.7	93	19	OK	0.02
10:55	66.7	64.3	92		OK	0.00
10:50	66.5	64.4	93		OK	0.00
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