As you requested, we have investigated the weather conditions in the vicinity of 15th and Market Street, Philadelphia, Pennsylvania on and prior to March 31, 2010, with particular attention to the existing conditions at approximately 7:00 PM on the 31st. The results of our investigation are presented in the following paragraphs.
Our research shows that exposed surfaces in Philadelphia were dry and free of snow and ice at the start of March 29, 2010. During the pre-sunrise hours of March 29, 2010, the sky over Philadelphia was partly cloudy and the low temperature was about 53 degrees. During the rest of the morning and the afternoon, the sky was mainly cloudy. The high temperature was at or just above the 70-degree mark. Between 2:00 PM and 5:00 PM showers accompanied by some thunder moved across the Philadelphia area. The sky became mostly clear during the evening hours and the temperature fell to approximately 55 degrees.
The sky was partly cloudy during the pre-sunrise hours of March 30, 2010 and the temperature held in the middle 50s. The sky was partly to mostly cloudy during the daylight and evening hours with no precipitation until the very end of the day when a couple of sprinkles gave a trace of rain. The temperature reached a high of 70 degrees and then fell to approximately 57 degrees by 12:00 Midnight. At the end of the day, there was no snow or ice on the ground.
March 31, 2010 was a cloudy day in Philadelphia, Pennsylvania. Rain fell from the start of the 31st until mixing with wet snow between 10:00 and 11:00 AM and then changing to all snow by 12:00 Noon. The temperature fell from near 57 degrees at the start of the day to approximately 36 degrees at 12:00 Noon. During the morning, the wind blew from the north and northwest at an average speed of 12 to 25 MPH with occasional gusts of 35 to 40 MPH. Mainly light snow fell between 12:00 Noon and 3:00 PM. The snow fell at a heavier rate from 3:00 PM until becoming light again between 5:00 and 6:00 PM. The temperature fell to 31 or 32 degrees by 3:00 PM and then held steady through 6:00 PM. During the afternoon, the snow accumulated on grassy areas, but most of the snow melted on paved and concrete surfaces, making them wet to slushy. The wind blew from the northwest at an average speed of 20 to 30 MPH with occasional gusts of 35 to 40 MPH. Light snow continued to fall during the rest of the evening and the temperature held near or just below 32 degrees. The wind continued to blow from the northwest at an average speed of 20 to 30 MPH with occasional gusts of 35 to 40 MPH. The snow continued into the early morning hours of April 1, 2010 giving a total accumulation on undisturbed, non-paved surfaces of 3.5 to 5.5 inches. Lesser amounts accumulated on paved and concrete surfaces.
Specifically, in the vicinity of 15th and Market Street, Philadelphia, Pennsylvania on March 31, 1997 at approximately 7:00 PM, the sky was cloudy, the temperature was approximately 31 degrees and the wind was blowing from the northwest at an average speed of 20 to 30 MPH with occasional gusts of 35 to perhaps 40 MPH. Snow was falling at the time in question and snow had been falling since the late morning hours. The day started with no snow or ice on the ground but by 7:00 PM an average of 2 1/2 to 4 1/2 inches of snow had accumulated on non-paved surfaces. During the daylight hours of the 31st, most of the snow melted on paved and concrete surfaces but there was some slush accumulation, especially after 3:00 PM. Prior to the time of sunset (6:23 PM), the snow began to accumulate on most paved and concrete surfaces. At 7:00 PM, there was up to an inch of snow and slush on untreated and undisturbed paved and concrete surfaces in the vicinity of 15th and Market Street.
The information in this report has been determined from the best sources of weather information available to us at this time and is the result of interpretation by our staff of professional meteorologists and represents our opinions to a reasonable degree of scientific certainty.
Note: All time references in this report are expressed in Eastern Standard Time (EST).
Note: Trace is an amount too small to be measured. For rain it is less than 0.01 of an inch and for snow it is less than 0.1 of an inch.
Note: Dates, times, names, and locations may have been changed to protect client confidentiality.
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