RedSky Posted April 23, 2022 Share Posted April 23, 2022 Can't wait until June when it gets warm... May looks like it could be -5F top ten coldest 1 1 Link to comment Share on other sites More sharing options...
ChescoWx Posted April 23, 2022 Share Posted April 23, 2022 I thought I would share a post from my Chester County PA Facebook Weather Site that arose from some farmer questions around the growing season and the relations to the relative elevation differences across the county. Along with an understanding of the differences between frost and freezes. This is going to be a pretty lengthy post as I started looking at some questions I received on frost vs. freeze and the growing season here in Chester County. First off I want to be sure everyone knows the difference between frost and freeze. Frost occurs when the temperature on the ground level reaches 32 degrees. However, the National Weather Services and trained COOP observers and spotters are required to measure the actual air temperature at 5 to 6 feet above the ground level. Therefore, it is easy to measure freezing temperatures based on weather observation records. Frost however can occur with temperatures in the upper 30's so records are not as robust for frost observations....unless it was reported in the notes section of weather observer reports. There are also significant differences based on elevation above sea level. Higher elevations across our county experience less frost and fewer freezing days as cold air is heavier and sinks into valley locations. This is why on calm and clear nights there can be a 5-to-10-degree difference over a mile...with temperatures lower and frost and freeze conditions more common at lower spots vs. higher locations. Here in Chester County, we range from the highest elevation of 1,071 ft. in the Welsh Mountains across Honey Brook Township...to the lowest elevation of 70 feet above sea level along the Schuylkill River at the Montgomery County line. The primary weather records I use are from Coatesville NWS Coop observers (1894-2003) and East Nantmeal Township (2003 to Present). The weather records from the NWS COOP observers between 1894 through 1982 were recorded in Coatesville at an elevation between 350ft and 400 ft above sea level. All observations since 1983 at both Coatesville and East Nantmeal have been taken between 650 ft to 685 ft above sea level. Due to this when I compare actual to average temperatures I use the higher elevation temperature averages for Chester County from 1983 to Present. This will be the 40th year of high elevation records. For all-time records (including temperature, rain, and snow) I use the combined records from 1894 to Present. Overall, the average annual temperature readings from 1894 through 1982 compared with 1983 through 2021 period are almost exactly the same! This, despite our current warming phase of our cyclical climate changes. As expected average high temperatures are more than 1 degree colder when analyzing the higher elevation observations from 1983 through today - with low temperatures averaging almost 2 degrees warmer than the lower spots ran from 1894 to 1983. Overall average annual temperatures from the first 89 years of obs from 1894-1982 had an average annual temperature of 52.2 degrees - compared with the 1984 through 2021 period having an annual average temperature of 52.5 degrees...so only 0.3 degrees warmer. Now due to the differences in elevation the growing season has shown a much greater difference compared to the overall temperature profiles when you compare the higher spots over 650 feet to the lower spots below 400 feet in our County. The near 2 degrees of low temperature warming due to the higher elevations along the ridges has resulted in a 2 week increase in the growing season comparing ridge vs. valley locations (172 days in the valley vs 186 days on the ridges). There is a one week or greater difference between both the last freeze of the spring (April 18th (ridge) vs April 25th (valley) and the first freeze of the fall (October 14th (valley) vs. October 24th (ridge). Of the 89 years of valley observations from 1894-1983 our last freeze in spring occurred in April a total of 60 times (68%) vs. 29 times in May (32%). On the ridges since 1983 our last spring freeze has occurred in April a total of 33 times (84%) compared to 3 times in both May (8%) and March (8%). Let me know if any questions or follow ups to any of the above information. Thanks again for your tremendous support and participation on this site!! It is deeply appreciated!! Sincerely, Paul Link to comment Share on other sites More sharing options...
CoolHandMike Posted April 24, 2022 Share Posted April 24, 2022 9 hours ago, RedSky said: Can't wait until June when it gets warm... May looks like it could be -5F top ten coldest I'm all for delaying the sweaty season as long as possible. Made it to 62.2°F here today with some sprinkles between 2-3PM. Tomorrow looks like fantastic grilling weather, and I've got some butterflied chicken breasts marinating in several different marinades, ready to go on the grill as soon as I'm done mowing my lawn tomorrow. Link to comment Share on other sites More sharing options...
Rtd208 Posted April 24, 2022 Share Posted April 24, 2022 Pretty nice morning out so far. Current temp 63 Link to comment Share on other sites More sharing options...
ChescoWx Posted April 24, 2022 Share Posted April 24, 2022 Beautiful day on tap for today! The record high for today is 90 degrees set back in 1960. The record low is 26 degrees from 1930. Record rain was the 2.40" that fell in 1968. Link to comment Share on other sites More sharing options...
KamuSnow Posted April 24, 2022 Share Posted April 24, 2022 It sure is beautiful out! 66F here now, full sun, not a cloud in sight. The sky does look slightly hazy, not a deep blue. Trees here are getting their leaves on. Link to comment Share on other sites More sharing options...
Hurricane Agnes Posted April 24, 2022 Author Share Posted April 24, 2022 Ended up hitting a high of 64 yesterday and had a low of 50 this morning. Currently a beautiful blue sky and a sunny 70 with low humidity (dp 43). Link to comment Share on other sites More sharing options...
RedSky Posted April 24, 2022 Share Posted April 24, 2022 Guidance is helping us out trending the New England low further northeast next week which will help moderate the chill and add sun. 1 Link to comment Share on other sites More sharing options...
Birds~69 Posted April 24, 2022 Share Posted April 24, 2022 65F here after earlier predictions in the week had temps near 80F. Looking forward to the mid week 50s... Link to comment Share on other sites More sharing options...
JTA66 Posted April 24, 2022 Share Posted April 24, 2022 Hit 74F today but now down to 61F. Looks like the back door front has pushed through. Link to comment Share on other sites More sharing options...
ChescoWx Posted April 25, 2022 Share Posted April 25, 2022 The record high for today is 93 set back in 1915 - our record low is the 28 set back in 1922. Record rain is the 1.50" from 1975. Link to comment Share on other sites More sharing options...
CoolHandMike Posted April 25, 2022 Share Posted April 25, 2022 Some pretty beautiful Asperitas clouds over our region at the moment. Link to comment Share on other sites More sharing options...
ChescoWx Posted April 26, 2022 Share Posted April 26, 2022 The record high for today was 90 degrees set in 1990. Our record low was 28 degrees from 1930. Record rainfall was the 1.73" that fell on this date back in 1937. Link to comment Share on other sites More sharing options...
Hurricane Agnes Posted April 26, 2022 Author Share Posted April 26, 2022 Made it up to 61 yesterday and had a low of 53 this morning with some low stratus and generally overcast skies. Sun has popped out now and it's party cloudy and 64 with dp 55. Link to comment Share on other sites More sharing options...
KamuSnow Posted April 27, 2022 Share Posted April 27, 2022 Was a little surprised to see a few glow worms last night. Impressive turnout actually. Currently 50F. Link to comment Share on other sites More sharing options...
ChescoWx Posted April 27, 2022 Share Posted April 27, 2022 Record high for today was the 94 on this date way back in 1915. The record low was the 26 from 1926. Record rainfall was 1.92" in 1913. Link to comment Share on other sites More sharing options...
Birds~69 Posted April 27, 2022 Share Posted April 27, 2022 Windy, partly cloudy, 50F...couple days w/overnight lows in the low/mid 30s coming up. Link to comment Share on other sites More sharing options...
CoolHandMike Posted April 27, 2022 Share Posted April 27, 2022 Holy moly was it ever so windy on the waterfront today! (near Pennsville, NJ) I've been away from it for over 2 hours and my face still hurts. Why I didn't put on one of the many, many gators I keep in my car, the world will never know. 1 Link to comment Share on other sites More sharing options...
Hurricane Agnes Posted April 27, 2022 Author Share Posted April 27, 2022 Had a generally unsettled day today although the sun did make some appearances in between the CAA clouds. Had a low of 46 this morning and a high of 56. Currently down to 46 and mostly cloudy with dp down to 31. I did see the Fire Weather Watches have been lofted for Thursday and Friday. Link to comment Share on other sites More sharing options...
RedSky Posted April 28, 2022 Share Posted April 28, 2022 No ice falling today but some could form tonight Link to comment Share on other sites More sharing options...
Birds~69 Posted April 28, 2022 Share Posted April 28, 2022 35F at 4:50am. Doubt I make it to freezing but close... Link to comment Share on other sites More sharing options...
CoolHandMike Posted April 28, 2022 Share Posted April 28, 2022 1 hour ago, Birds~69 said: 35F at 4:50am. Doubt I make it to freezing but close... Winds are already howling, too. I'm supposed to be out in it again but I'm taking a sick day. Hoping my head cold is just that. 1 Link to comment Share on other sites More sharing options...
Hurricane Agnes Posted April 28, 2022 Author Share Posted April 28, 2022 Looks like I may have bottomed out at 36 this morning now that I am posting right around sunrise. Currently mostly cloudy, 37 and very breezy, with a dp of 23. Link to comment Share on other sites More sharing options...
Hurricane Agnes Posted April 28, 2022 Author Share Posted April 28, 2022 Red Flag Warning was lofted - Quote Red Flag Warning URGENT - FIRE WEATHER MESSAGE National Weather Service Mount Holly NJ 359 AM EDT Thu Apr 28 2022 NJZ001-007>010-012>015-017>020-022-025>027-PAZ054-055-060>062-070- 071-101>106-281700- /O.UPG.KPHI.FW.A.0001.220428T1600Z-220429T0200Z/ /O.NEW.KPHI.FW.W.0001.220428T1500Z-220429T0200Z/ /O.CON.KPHI.FW.A.0002.220429T1300Z-220430T0200Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Gloucester-Camden- Northwestern Burlington-Ocean-Atlantic-Coastal Atlantic- Coastal Ocean-Southeastern Burlington-Carbon-Monroe-Berks-Lehigh- Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester- Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- 359 AM EDT Thu Apr 28 2022 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 10 PM EDT THIS EVENING FOR LOW RELATIVE HUMIDITIES AND GUSTY WINDS FOR MUCH OF NEW JERSEY AND EASTERN PENNSYLVANIA ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR LOW RELATIVE HUMIDITIES AND GUSTY WINDS FOR MUCH OF NEW JERSEY AND EASTERN PENNSYLVANIA... * AFFECTED AREA...Sussex, Warren, Morris, Hunterdon, Somerset, Middlesex, Western Monmouth, Eastern Monmouth, Mercer, Gloucester, Camden, Northwestern Burlington, Ocean, Atlantic, Coastal Atlantic, Coastal Ocean, Southeastern Burlington, Carbon, Monroe, Berks, Lehigh, Northampton, Delaware, Philadelphia, Western Chester, Eastern Chester, Western Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks. * TIMING...Daytime today (for the Red Flag Warning) and daytime Friday (for the Fire Weather Watch). * WINDS...Northwest 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 17 percent. * TEMPERATURES...In the upper 40s to mid 50s today and upper 50s to low 60s on Friday. * IMPACTS...Critical fire weather conditions expected. Increased risk for rapid wildfire growth and spread. Prescribed burns may get out of control. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly due to a combination of strong winds, low relative humidity, and dry fuels. Any fires that develop may quickly get out of control and become difficult to contain. A Fire Weather Watch means that critical fire weather conditions are forecast to occur due to a combination of strong winds, low relative humidities, and dry fuels. Listen for later forecasts and possible Red Flag Warnings. For more information about wildfire danger, burn restrictions, and wildfire prevention and education, please visit your state forestry or environmental protection website. && $$ Link to comment Share on other sites More sharing options...
Birds~69 Posted April 28, 2022 Share Posted April 28, 2022 1 hour ago, CoolHandMike said: Winds are already howling too. I'm supposed to be out in it again but I'm taking a sick day. Hoping my head cold is just that. Watching Fox29 they are going with 35+ wind gust today, 25+ tomorrow and 20+ Saturday so a couple more days. My head feels like it weighs 100 lbs. Not sure if it's allergies or some sort of cold like yourself... 37F 1 Link to comment Share on other sites More sharing options...
ChescoWx Posted April 28, 2022 Share Posted April 28, 2022 The low this morning was 33.3 degrees. The record high today is 89 degrees set in 1957. The record low reading is 26 degrees from 1946. Record rain for this date is the 2.00" that fell today in 1928. Link to comment Share on other sites More sharing options...
CoolHandMike Posted April 28, 2022 Share Posted April 28, 2022 4 hours ago, Birds~69 said: Watching Fox29 they are going with 35+ wind gust today, 25+ tomorrow and 20+ Saturday so a couple more days. My head feels like it weighs 100 lbs. Not sure if it's allergies or some sort of cold like yourself... 37F Mine came on all of a sudden like an allergy attack Tuesday afternoon, but it's lingering like a cold this morning. Sudafed and Mucinex are the only things keeping me from feeling like absolute crap. Hope you get better soon. Looks like sustained 10-15mph with occasional gusts nearing 20 imby. Currently just under 50°F, bright and sunny, though this morning before the sun was up I was getting late fall vibes. 1 Link to comment Share on other sites More sharing options...
RedSky Posted April 28, 2022 Share Posted April 28, 2022 48F at 12:30 under full sun on April 28th - spring Link to comment Share on other sites More sharing options...
RedSky Posted April 28, 2022 Share Posted April 28, 2022 CFS is forecasting a -5F May Going by the completely obliterated southeast ridge since the spring equinox it's believable The next far below normal cold intrusion is already on the radar for the first full weekend in May. Like clockwork since early January the most stable repeating pattern I think I have ever seen. 1 Link to comment Share on other sites More sharing options...
Birds~69 Posted April 28, 2022 Share Posted April 28, 2022 41 minutes ago, RedSky said: CFS is forecasting a -5F May Going by the completely obliterated southeast ridge since the spring equinox it's believable The next far below normal cold intrusion is already on the radar for the first full weekend in May. Like clockwork since early January the most stable repeating pattern I think I have ever seen. Accu weather at noon going w/below normal May 5-11... 51F Link to comment Share on other sites More sharing options...
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