A cold front triggered severe thunderstorms over the Lower Susquehanna Valley during the late afternoon and early evening. The storms produced several reports of wind damage and isolated one-inch diameter hail.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CTP wrote it up.
A cold front triggered severe thunderstorms over the Lower Susquehanna Valley during the late afternoon and early evening. The storms produced several reports of wind damage and isolated one-inch diameter hail.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS State College, PA wrote its last area forecast discussion before the first event at Aug 16, 2:16 PM EST, 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 316 PM EDT MON AUG 16 2010 .SYNOPSIS... A COLD FRONT WILL PUSH THROUGH THE COMMONWEALTH TODAY. HIGH PRESSURE WILL BUILD INTO THE REGION TONIGHT INTO TUESDAY ACCOMPANIED BY CLEARING SKIES AND MUCH LOWER HUMIDITY. A WAVE OF LOW PRESSURE MAY SPREAD SHOWERS...OR EVEN A FEW PERIODS OF STEADY RAIN...INTO THE STATE FROM THE SOUTHWEST ON WEDNESDAY. ANOTHER AREA OF HIGH PRESSURE WILL BRING GRADUAL CLEARING THURSDAY AFTERNOON INTO FRIDAY...ALONG WITH INCREASING WARMTH AND HUMIDITY. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 9 PM BUT EXPECT TO BE ABLE TO TRIM AWAY AT THAT THROUGH THE LATER AFTERNOON. LITTLE IF ANY LIGHTNING SO FAR TODAY AND THE STORMS ARE MAKING IT TO THE EASTERN EDGE OF OUR CWA AT THIS TIME. WINDS BEHIND THE FRONT TYPICALLY 15 TO 20 KTS SO EXPECT DRY AIR TO MOVE IN QUICKLY. DEWPOINTS DROPPED INTO THE 50S OVER WESTERN PA THIS AFTERNOON. TEMPERATURES WILL FALL INTO THE 40S OVER THE NORTHERN MOUNTAINS TONIGHT WITH 50S TO LOW 60S ELSEWHERE. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/... A RETURN TO COMFORTABLE HUMIDITY WITH A DECENT AMOUNT OF SUNSHINE FOR TUESDAY AS AN EAST/WEST RIDGE OF HIGH PRESSURE NOSES INTO THE REGION FROM THE OHIO RIVER VALLEY. PWATS DIP TO AOB 20 MM ACROSS MUCH OF CENTRAL AND NRN PENN / OR -1 TO -2 ST DEVIATIONS/. A SHARP GRADIENT TWD HIGHER PWAT AIR /AND PERHAPS SOME STUBBORN AND THICKER CLOUD COVER/ WILL EXIST ACROSS WVA AND NRN VA NEAR A STALLED OUT FRONTAL BOUNDARY. MAX TEMPS TUES WILL BE NEAR TO A FEW DEGREES BELOW NORMAL...RANGING FROM THE MID/UPPERR 70S ACROSS THE MTNS...TO THE MID/UPPER 80S IN THE LOWER SUSQ VALLEY. A WAVE DEVELOPING ALONG THE FRONTAL BOUNDARY WILL SPREAD CLOUDS OVER THE SOUTHERN HALF OF THE STATE TUESDAY NIGHT. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... AS THE HIGH PRESSURE AREA SLIDES ENE INTO NEW ENGLAND ON WEDNESDAY...A LLVL EAST TO SE FLOW WILL DEVELOP WITHIN THE THERMALLY DIRECT CELL OF ANOTHER JET STREAK RACING IN FROM THE MIDWEST. SHOWERS AND SCTD TSRA /OR EVEN PERIODS OF STEADY RAIN/ DEVELOP FROM THE WEST OR SW DURING THE DAY WEDNESDAY AS THE MAIN UVVEL WITH THE UPPER JET DEEPENS/BECOMES FOCUSED ACROSS THE REGION...AND A SFC WAVE MOVES EAST ACROSS VA. EC AND SREF COMBO ARE THE MOST AGGRESSIVE WITH THE AMTS AND NRN EXTENT OF THE RAIN...THOUGH EVEN THESE TWO...WETTER SOLUTIONS HAVE COME INTO BETTER AGREEMENT THIS CURRENT MODEL RUN WITH THE FURTHER SOUTH GFS/NAM/GEM MODELS. THE PRECIP SHOULD BE MORE SHOWERY AND MUCH LIGHTER ACROSS THE NORTH WED AND WED NIGHT...WHILE STEADIER AND HEAVIER RAIN /AND PERHAPS SOME ELEVATED TSRA/ OCCURS ACROSS THE SOUTHERN ZONES. QPF TOTALS BY 12Z THURSDAY COULD BE IN THE 0.5-1.0 INCH RANGE NEAR AND TO THE SOUTHEAST OF INTERSTATE 81. ANOTHER WEAK HIGH PRESSURE RIDGE BECOMES SITUATED FROM THE OHIO VALLEY TO NEW ENGLAND THURSDAY AND FRIDAY WITH MAINLY DRY CONDITIONS AND NEAR TO SLIGHTLY ABOVE NORMAL TEMPS. TEMPS AND HUMIDITY RAMP UP AGAIN FOR FRIDAY INTO SATURDAY AS A SIGNIFICANT WAVE OF LOW PRESSURE AT THE SFC AND ALOFT TRACKS EAST ACROSS THE UPPER GLAKES REGION. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... KMDT WILL HAVE CFROPA BY 20Z...BUT WILL SEE TSRA BEFORE THAT...MAINLY BEFORE 19Z. ALL OTHER SITES SHOULD REMAIN VFR THROUGH LATER TONIGHT. EVEN THEN...THE DRYING OCCURRING NOW WILL PRECLUDE FOG - ESP IFR FOG - FROM MOST SITES. THE COOL TEMPS DUE TO HIGH PRESSURE SLIDING IN FM THE W AND RESULTING LIGHT WINDS WILL ALLOW SOME RIVER VALLEY FOG IN THE NRN MTS. SO...KIPT MAY GET A LITTLE FOG. HIGH PRESSURE AND MAINLY VFR CONDITIONS WILL HOLD INTO THE DAYTIME ON WED. RIVER VALLEY FOG PSBL EACH AM IN THE N. OUTLOOK... TUE...VFR. NO SIG WX. WED-FRI...MVFR-IFR PSBL. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...LAMBERT NEAR TERM...STEINBUGL/TYBURSKI SHORT TERM...LAMBERT/TYBURSKI LONG TERM...LAMBERT/TYBURSKI AVIATION...DANGELO
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 129 PM EDT MON AUG 16 2010 PAZ004>006-010>012-017>019-024>027-033>035-037-041-042-045-046- 171730- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- SOMERSET-BEDFORD-FULTON-TIOGA-NORTHERN LYCOMING-SULLIVAN- SOUTHERN CLINTON-SOUTHERN LYCOMING- 129 PM EDT MON AUG 16 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ028-036-049>053-056>059-063>066-171730- JUNIATA-FRANKLIN-UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY- DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-YORK-LANCASTER- 129 PM EDT MON AUG 16 2010 ...SEVERE THUNDERSTORM WATCH 619 IN EFFECT UNTIL 9 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1259 PM EDT MON AUG 16 2010
PAZ051>053-161745-
COLUMBIA PA-MONTOUR PA-NORTHUMBERLAND PA-
1259 PM EDT MON AUG 16 2010
...A STRONG THUNDERSTORM WILL AFFECT MONTOUR...NORTHERN
NORTHUMBERLAND AND WEST CENTRAL COLUMBIA COUNTIES...
AT 1256 PM EDT...A STRONG THUNDERSTORM WAS NEAR MILTON...MOVING EAST
AT 20 MPH.
WIND GUSTS TO 50 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR MOORESBURG AROUND 120 PM...DANVILLE AROUND
130 PM...MECHANICSVILLE AROUND 140 PM AND BLOOMSBURG AROUND 150 PM.
THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 213 AND 235. THIS WILL
ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY 147 FROM I-80
TO MILTON...ROUTE 11 FROM EAST OF NORTHUMBERLAND TO WEST OF
BLOOMSBURG.
LAT...LON 4084 7653 4095 7688 4097 7688 4100 7686
4103 7686 4111 7675 4107 7641
FORECASTER: DANGELOSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
240 PM EDT MON AUG 16 2010
PAZ057-161930-
DAUPHIN PA-
240 PM EDT MON AUG 16 2010
...A STRONG THUNDERSTORM WILL AFFECT NORTHERN DAUPHIN COUNTY...
AT 237 PM EDT...A STRONG THUNDERSTORM WAS NEAR MILLERSBURG...MOVING
EAST AT 20 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
FILL POOR DRAINAGE AREAS. THE RAIN WILL CAUSE RAPID RISES ON SMALL
STREAMS AND CREEKS. THIS STORM WILL BE NEAR ELIZABETHVILLE AROUND 300
PM...LYKENS AROUND 320 PM AND WILLIAMSTOWN AROUND 330 PM.
THIS WILL IMPACT ROUTE 209 FROM MILLERSBURG TO NEAR WILLIAMSTOWN.
LAT...LON 4042 7676 4052 7698 4061 7695 4065 7670
4056 7655
FORECASTER: DANGELOSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 251 PM EDT MON AUG 16 2010 PAZ035-036-161915- FRANKLIN PA-FULTON PA- 251 PM EDT MON AUG 16 2010 ...STRONG THUNDERSTORMS WILL AFFECT FRANKLIN AND SOUTHERN FULTON COUNTIES... AN AREA OF STRONG THUNDERSTORMS COVERED SOUTHERN FRANKLIN AND FULTON COUNTIES AT 250 PM EDT. THE STRONG THUNDERSTORMS WERE GENERALLY MOVING EAST AT 30 MPH. WIND GUSTS TO 45 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS. VERY HEAVY RAIN WILL FALL FROM THESE STRONG THUNDERSTORMS...AND WILL CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN WILL CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS. THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES... I-70 BETWEEN MILE MARKERS 163 AND 170...I-81 BETWEEN MILE MARKERS 1 AND 22. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11 FROM THE MARYLAND BORDER TO NORTH OF CHAMBERSBURG...ROUTE 522 FROM THE MARYLAND BORDER TO NORTH OF MCCONNELLSBURG...ROUTE 30 FROM WEST OF MCCONNELLSBURG TO FAYETTEVILLE. LAT...LON 4000 7750 3973 7747 3973 7835 4001 7802 FORECASTER: DANGELO
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
319 PM EDT MON AUG 16 2010
PAZ036-063-064-162015-
ADAMS PA-CUMBERLAND PA-FRANKLIN PA-
319 PM EDT MON AUG 16 2010
...A STRONG THUNDERSTORM WILL AFFECT ADAMS...SOUTHEASTERN FRANKLIN
AND WESTERN CUMBERLAND COUNTIES...
AT 316 PM EDT...A STRONG THUNDERSTORM WAS NEAR SHIPPENSBURG. ANOTHER
STRONG STORM WAS OVER SOUTH MOUNTAIN. THESE STORMS ARE MOVING EAST
AT 30 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE. VERY HEAVY RAIN WILL FALL...AND
WILL CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE
RAIN WILL CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 216 AND 225...I-81 BETWEEN
MILE MARKERS 25 AND 49. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR
ROADS...ROUTE 11...ROUTE 15...ROUTE 30...STATE ROAD 94...STATE ROAD
97.
LAT...LON 4009 7755 4029 7720 4029 7718 4009 7711
4007 7714 4006 7710 3972 7700 3972 7746
FORECASTER: DANGELOThe State College radar (KCCX), 105 km away, was scanning. The volume nearest the first event began at 19:45 UTC.
12 thunderstorm wind, 1 funnel cloud, 1 hail. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Carlisle.
Thunderstorm winds estimated near 60 mph pushed over a propane tank at a church camp on Mountain Drive near Lickdale.
Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in Greemount.
A funnel cloud was sighted near Ono.
National Weather Service meteorologists and Lebanon County Emergency Management officials surveyed a long but sporadic area of thunderstorm wind damage north of Lebanon city. The most concentrated area of damage was located around the Freeport Mills Golf Course, where severe winds estimated near 70 mph knocked down and uprooted over 20 trees along a 1 mile path. The severe winds and associated tree damage produced minor structural damage to the golf course club house and blew out two windows. A separate residential home across the street on Freeport Road also sustained minor damage. Some crop damage was visible along Golf Road near the golf course. Despite credible eyewitness reports of rotating wall and funnel clouds from trained spotters, none of the storm damage could definitely be attributed to a tornado. Therefore, the survey confirmed that the damage was caused by a microburst or straight line winds.
Thunderstorm winds estimated near 60 mph knocked down trees and utility wires a few miles east of Brickerville in Clay Township.
A measured wind gust of 67 mph was reported in Ephrata.
Thunderstorm winds estimated near 60 mph knocked down large trees along Route 322 north of New Holland.
Thunderstorm winds estimated near 60 mph tore a roof off a building at the intersection of Route 322 and Ewell Road in East Earl Township.
Thunderstorm winds estimated near 60 mph knocked down trees near Churchtown.
Thunderstorm winds estimated near 60 mph knocked down numerous trees and utility wires at the intersection of South Pool Forge and Narvon Road.
Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in York Springs.
Thunderstorm winds estimated near 60 mph knocked down large trees in Shrewsbury.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2010Every state in 2010This day in weather historyWarnings in Pennsylvania, August 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 241697, 241699, 241700, 241701, 241946, 241704, 241705, 241947, 241948, 241959, 241950, 241961, 241963, 241964.