EAST EARL, Pa. — Pennsylvania endured weather whiplash as the near record-dry month of June transitioned into punishing triple-digit heat, capped by back-to-back holiday weekend storms that delivered on the positive side what can be described as a “million-dollar rain” for crops.

However, along with desperately needed moisture, the storms caused millions of dollars in damage, left around 200,000 homes and businesses without power at peak, closed over 200 roads across 64 of Pennsylvania’s 67 counties, and tragically claimed three lives, including a mother and son camping in Cumberland County and a boater in Chester County, according to state emergency management.

Images of snapped and toppled trees on cars, buildings, roads, and power lines dominated much of Pennsylvania into New Jersey and Maryland, including hard-hit Lancaster and surrounding counties. The storms Saturday evening, July 4, brought winds clocked at 60 to 75 mph in what PPL Utilities reported was among their worst outage events, ever.

Flash flooding followed in the days after as a second round of storms on Sunday evening, July 5, dropped another 1.5 to 4.25 inches of rain in one hour in many areas (including Lancaster County), on top of 0.5 to 1.25 inches from the previous day.

By noon Tuesday, July 7, officials reported Lancaster County still leading in outages as 36,000 customers across eight Pennsylvania counties remained without power while utility crews, including mutual-aid teams from Canada, worked to restore it. Fire companies and first responders conducted flash-flood water rescues from Hershey to Tyrone and the northern tier, and helped clear roads. Contractors and church volunteer groups were also visible in the ongoing cleanup.

In hard-hit communities, neighbors were helping neighbors. In one example, reported by Jason Horning in a social media post, high winds tore through the roof of his cousin’s dairy barn outside New Holland at 7 p.m. July 4th.

“In true Lancaster County fashion, nobody panicked, they got to work,” he wrote, explaining that by 10 p.m., family members, fellow farmers, and neighbors had cleared the debris, and with the help of area businesses, including AB Martin Roofing Supply, set up fabrication of replacement roof panels on-site to complete a new roof by 10 a.m. the next morning.

Heat stress on livestock

The storms brought a reprieve from the heatwave after Harrisburg recorded temps of 102°F on consecutive days, with 103 to 105°F temps and indices above 115°F reported in parts of Lancaster and Berks counties.

Overnight lows had stayed remarkably high (e.g., 88°F recorded at 11 p.m. on July 3 near Harrisburg), producing added stress for livestock by preventing cows from dissipating heat overnight.

The July 3 weekly report by USDA Dairy Market News confirmed seasonal declines in milk components have accrued earlier and faster than normal under the prolonged heat dome across the Midwest and Northeast.

Critical moisture for crops

While some farms reported tree and fence damage and worked to keep cows cool, watered, milked, and fed with generators through multi-day power outages, others took time to reflect on how critical the timely moisture was for crops and pastures.

Penn State Extension Agronomist Del Voight confirmed the moisture came at a critical time as tassels arrived in early-planted corn in southeast and south-central Pennsylvania after accumulating around 1200 heat units by July 7. Meanwhile, the July 6 USDA NASS Crop Progress Report showed 4% of the Commonwealth’s corn was in silking stage vs. 2% a year ago and 1% as a 5-year-average.

Voight also reported in his July 7 post: “This past weekend’s storms have left many cornfields across southeastern Pennsylvania with significant wind damage, including root lodging, leaf shredding, and some flattened corn.”

Where corn is down or leaning, but roots are intact, the plant typically will respond by righting itself in the coming week, Voight noted: “If you get into the corn and it’s snapped off below the ear, then decisions will need to be made quickly.”

Fields with corn that is leaning or partially lodged can recover and continue to mature, though slower, he explained, urging continued scouting for ear mold during grain fill and dry down to gauge the need for an earlier harvest.

While farmers in Pennsylvania and Maryland posted photos of wind-damaged cornfields, my own drive around parts of eastern Lancaster County near home, revealed some of the visibly flattened fields as of early Sunday morning were showing some recovery when viewed from the road 48 hours later. Aerial photographs, however, demonstrate the need for assessments within fields.

The entire sequence matched warnings from ABC27 meteorologist and Franklin County farmer Eric Finkenbinder at conferences last winter, where he told farmers “the summers are hotter, with warmer nights, and when it rains, it pours. Then we see a relatively new situation on the rise, and that is rapid-onset drought risk in between.”

He had been tracking June rainfall deficits and steady declines in soil moisture that put the month in the top five driest Junes in history.

The most recent U.S. Drought Monitor Map (June 30) identified southeastern and south-central Pennsylvania in moderate to severe drought within the eastern pattern that extends across New Jersey, with areas of extreme drought in states farther south.

Meanwhile, the July 6 USDA National Drought Mitigation indicator map shows extreme conditions for ‘flash drought’ overlaying the same areas of Pennsylvania.

Penn State Climatologist Kyle Imhoff warned in his June 30 forecast that the heatwave would rapidly deplete remaining soil moisture in southeastern Pennsylvania, and Vegetation Drought Response Index maps showed the already widespread crop stress developing from flash drought conditions on top of the longer-term precipitation deficits since last fall.

Voight estimated corn in the region had nine days of leaf roll before the holiday storms, along with shallow-rooted pastures browning quickly and evidence of potassium deficiencies and increased insect pressure on weakened plants.

The initial 0.5 to 1 inch of storm moisture resuscitated topsoil moisture at a critical time, but the heavier deluge behind it likely contributed more to flash flooding than to the needed recharge of subsoil deficits.

Outlook

Forecasters expect the pattern of heat, humidity, and scattered thunderstorms to continue through most of July, favoring localized downpours over widespread soaking rains.

While abundant Gulf moisture could continue chipping away at drought across the Mid-Atlantic and Southeast, repeated storm tracks also raise the risk of flash flooding as abrupt swings from drought to deluge test farm management of crops and livestock as well as emergency management, infrastructure readiness, and the resilience of people working together across communities.