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E PA/NJ/DE Spring 2026 Obs/Discussion


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Recovered last night, up to 1.22” since yesterday morning. Low level precip this am as it is raining steadily (light to occasional moderate)without radar representation .

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Since Tuesday a general 2.5" to 5.0" of very welcome rainfall has taken place across Chester County.
West Grove 5.14" / West Bradford 4.39" / Kennett Square 4.32" / Longwood Gardens 4.22" / West Chester 3.97" / Nottingham 3.24" / Atglen 2.91" / Glenmoore 2.87" / Chester Springs 2.79" / East Nantmeal 2.62" and Warwick Twp. 2.48"
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Picked up 1.25" overnight, most of it in the very early morning hours, saw some nice returns on the radar loop. Makes 2.23" for the weekend, and 3.25" since Tuesday. Yay hooray!

Eta, that's 6 days in a row now with some rain!

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Have been calculating my totals from this long duration event and so far -

5/20 - 0.81"

5/21 - 0.31"

5/22 - 0.05"

5/23 - 0.74"

5/24 - 1.40"

5-day TOTAL = 3.31" :o :thumbsup:

(Month to date = 4.41")

Today was the heaviest so far, pretty much a month's worth these last 5 days that was needed for a good soaking after that heat!

Bottomed out at 50 and made it to 59 for a high.  currently overcast and 58 with dp 57.

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Recent rainfall across portions of the Lehigh Valley, including approximately 1.40 inches at my location, was certainly beneficial for vegetation, lawns, crops, and surface soil moisture. However, despite this rainfall, stream base flows continue to decline rapidly, indicating that the region is still experiencing significant underlying groundwater deficits.

One of the primary reasons for this is that late May and early June represent peak seasonal vegetation demand. Trees and crops are now fully leafed out and actively transpiring large amounts of water back into the atmosphere. As a result, much of the recent rainfall is being intercepted by vegetation or absorbed into extremely dry upper soil layers before it can deeply infiltrate and meaningfully recharge aquifers and groundwater systems.

The geology of the Lehigh Valley further complicates drought recovery. Carbonate limestone and dolomite formations common throughout the region can rapidly absorb rainfall through fractures and karst features, while upland shale and sandstone areas often have limited groundwater storage capacity. This creates a situation where streams may temporarily rise after rainfall events but then quickly recede once runoff diminishes.

Although recent precipitation has helped reduce immediate vegetation stress and temporarily improved surface conditions, true hydrologic recovery will likely require multiple widespread soaking rain events, lower evapotranspiration rates, and sustained groundwater recharge over an extended period of time before stream base flows and aquifer levels fully recover.

Lehigh County also recently experienced one of its driest Aprils on record, and year-to-date precipitation deficits continue to contribute to ongoing drought-related concerns throughout the region.

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Happy Memorial Day and thank you to those who serve our country. Still some showers around today before we finally see a return of the sun tomorrow. Temperatures both tomorrow and Wednesday will be several degrees above normal with highs not far from 80 degrees. We then see a return of cooler than normal temperatures but with mostly sunny days right through next weekend.

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On 5/24/2026 at 5:11 PM, Hurricane Agnes said:

Have been calculating my totals from this long duration event and so far -

5/20 - 0.81"

5/21 - 0.31"

5/22 - 0.05"

5/23 - 0.74"

5/24 - 1.40"

5-day TOTAL = 3.31" :o :thumbsup:

(Month to date = 4.41")

Today was the heaviest so far, pretty much a month's worth these last 5 days that was needed for a good soaking after that heat!

Bottomed out at 50 and made it to 59 for a high.  currently overcast and 58 with dp 57.

And I managed to squeeze out another 0.05" this morning for a 6-day total of 3.36" for the event and 4.46" for the month so far.

Much warmer today (and the sun popped out this afternoon), getting me to a high of 74 after a low of 57.

It's currently 69 with dp 67.

 

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Partly sunny today with a chance of some showers tomorrow morning. Today and tomorrow will be our warmest days of the week with temperatures a couple of degrees above normal for late May with highs in the upper 70's. A great stretch of weather begins on Thursday and through the weekend with sunny skies and with temperatures cooling to several degrees below normal by Saturday with highs near 70 degrees.

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Some more needed rain is crossing the area this morning. We are now up to over 85% of our normal rainfall for the year to date here in East Nantmeal with some spots now approaching average precipitation levels for the year. Today will be our last in a stretch of mainly cloudy and wet days. A beautiful end to the work week and upcoming weekend is on the way. Plenty of sun on the way with temperatures running a few degrees below normal as we close out May and move into June.

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Some outstanding weather on the way for much of the next week. We will stay a few degrees below normal until maybe warming up close to average temperatures for June by next weekend. In fact here in East Nantmeal May will finish as the 6th below normal month over the last 8 months dating back to last October. Rain chances look slim to none over the next week.

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What we are experiencing in Pennsylvania today—a dry, gusty, almost desert-like northwest wind—is actually part of the same larger weather pattern that is hammering the higher elevations of New England.

At the summit of Mount Washington, temperatures can be 30–40°F colder than the valleys, and when a late-season cold upper-level trough swings through, the mountain essentially reverts back to winter. Six inches of snow and sleet at the end of May, with June literally days away, is extraordinary but not impossible on that mountain. Mount Washington is famous for producing weather that feels more like January than late spring.

For perspective:

  • Many locations in Pennsylvania are seeing temperatures in the 60s and even 70s.
  • Trees are fully leafed out across the Northeast.
  • Memorial Day has already passed.
  • Yet the summit of Mount Washington is receiving accumulating snow significant enough to disrupt travel to the top.

Like you, I've seen snow in May before, but seeing conditions severe enough that you'd say "Forget about taking the train or driving to the summit!" right on June's doorstep is something most people witness only a handful of times in their lives.

What's even more striking is the contrast:

  • Lowhill Township: dry, windy, fire-weather type conditions.
  • Mount Washington: sleet, snow, winter driving conditions.

That is nearly a January-to-June weather difference occurring within a single region of the Northeast.

Weather enthusiasts often say that if you don't like the weather on Mount Washington, wait five minutes. But getting a legitimate snowstorm there at the end of May is the kind of event that people will be talking about when they look back on the weather records for 2026.

As a longtime weather observer, my reaction is understandable—this is one of those "I can't believe I'm seeing this so close to June" moments.

 
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