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March 2021


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1 hour ago, crossbowftw3 said:

The level of concern I hold for Wednesday's severe event down south is escalating. This wide warm sector could be accompanied by favorable shear, LRs, moderate forcing, and very favorable surface track.

This is a warm sector you should be seeing in April or May, not March. This is getting increasingly worrying.

image0 (2).jpg

 

 

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1 hour ago, doncat said:

I keep records for just about everything, but not humidity lol...I believe the lowest my station has gotten is around 13%.

I think that 3-30-07 may be the record lowest relative humidity.

LGA

1:51 PM 63 F 2 F 9 %

EWR

5:51 PM 68 F -5 F 5 %

JFK

7:51 PM 64 F 0 F 8 %
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2 hours ago, Rjay said:

Gotten sleet near 50 before but never snow. It was definitely snow lol.  

Had a 5 minute burst of snow accompanied by strong wind gusts about 2 hours ago.  Temp was 48 when it started.  Down to 38 now and still strong wind gusts.  No wind damage so far this time; I'm out of cupolas.

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Tomorrow will be the coldest day of the week and possibly the coldest day until at least late next fall. Temperatures will tumble into the lower and middle 20s from Philadelphia to New York City and into the teens in some areas outside of those cities. This cold shot following the recent warmth is not unusual.

Since 1990, 73% of cases that saw a high temperature of 70° or above during March 1-15 were followed by a low temperature of 32° or below during the following two weeks. 54% of such cases saw a low temperature below 30° during the following two weeks and 27% saw the temperature fall below 25°. The mean lowest temperature during the following two weeks was 29°. In addition, the March 16-19 period could offer a period of opportunity for a light snow event in parts of the region.

Next weekend could mark the start of a new warming trend. Since 1950, nearly 60% of days two weeks after the AO reached +3.000 or above in the March 1-15 period were warmer than when the AO reached +3.000 or above. The AO reached +3.000 on March 10. The mean increase was 2.8°. This suggests that it is more likely than not that the closing week of March could see a return to warmer conditions.

Out west, a major to historic blizzard will continue into late tonight or early tomorrow. Cheyenne will likely set its all-time storm total snowfall record.

Cheyenne's All-Time Snowfall Records:

Daily: 19.8”, November 20, 1979; 2-Day: 25.2”, November 20-21, 1979; 3-Day: 25.6”, November 19-21, 1979  

The ENSO Region 1+2 anomaly was +0.2°C and the Region 3.4 anomaly was -0.7°C for the week centered around March 3. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.43°C and the ENSO Region 3.4 anomaly has averaged -0.87°C. La Niña conditions will likely prevail at least through most of March. Afterward, neutral-cool ENSO conditions will likely develop as the spring progresses.

The SOI was -2.44 today. The SOI had recently been negative for 10 consecutive days. That development could be an early indication that what has been a fairly stable La Niña regime throughout the winter could be moving closer to its end stages.

The preliminary Arctic Oscillation (AO) figure was +4.329 today.

On March 13 the MJO data was unavailable.

The significant December 16-17 snowstorm during what has been a blocky December suggests that seasonal snowfall prospects have increased especially from north of Philadelphia into southern New England. At New York City, there is a high probability based on historic cases that an additional 20" or more snow will accumulate after December. Since January 1, New York City has picked up 28.1" snow.

Winters that saw December receive 10" or more snow, less than 10" in January, and then 10" or more in February in New York City, saw measurable snowfall in March or April in 83% of cases. Winter 2009-2010 was the exception where only a trace of snow was recorded. This group of winters saw 6" or more snow during the March-April period in 50% of the cases. All said, it is more likely than not that there will be measurable snowfall after February.  

Based on sensitivity analysis applied to the latest guidance, there is an implied 62% probability that New York City will have a warmer than normal March. March will likely finish with a mean temperature near 43.2° (0.7° above normal).

 

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The next 8 days are averaging 40degs.(33/48), or about -3.0 to -4 0.

All models have a Trace of Snow coming up.   GFS goes AN about the 21st. and wants to stay there for the rest of the month.       (45/61) from 3/21-3/30.

25*(35%RH) here at 6am.      24* at 7am.     ( was 32* at midnight)      28* by Noon.       30* at 1pm.      32* at 2pm.         37* by 4pm.      40* by 5:30pm.       36* by 9pm.

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Morning thoughts...

In 1990, temperatures rose into the upper 70s and lower 80s across much of the northern Middle Atlantic region. This time around, it will feel more like mid-February than mid-March.

At 7 am EDT, temperatures included: Albany: 12°; Allentown: 22°; Binghamton: 12°; Boston: 17°; Bridgeport: 21°; Danbury: 20°; Islip: 22°; New York City: 24°; Newark: 25°; Philadelphia: 28°; Poughkeepsie: 20°; Providence: 18°; and, White Plains: 20°. These will likely be the coldest temperatures the region will see until late next fall.

Despite strong sunshine, temperatures will top out only in the upper 30s and the lower 40s across most of the region. Likely high temperatures around the region include:

New York City (Central Park): 40°

Newark: 42°

Philadelphia: 43°

Clouds will increase tonight. It will be mostly cloudy and continued cold tomorrow. A period of light snow could impact the region. Overall, the March 16-19 period remains a period of opportunity for at least some snowfall in parts of the region. A pronounced warming trend could commence during the weekend.

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