On the edge of a large eastern CONUS ridge, thunderstorms developed despite the warm temperatures aloft as surface dewpoints increased to the low 70s and surface based parcels were able to overcome the ridge.
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 PBZ wrote it up.
On the edge of a large eastern CONUS ridge, thunderstorms developed despite the warm temperatures aloft as surface dewpoints increased to the low 70s and surface based parcels were able to overcome the ridge.
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 Pittsburgh, PA wrote its last area forecast discussion before the first event at Jun 17, 11:03 AM EST, 2 hours 42 minutes earlier.
Area Forecast Discussion
National Weather Service Pittsburgh PA
1203 PM EDT Mon Jun 17 2024
.SYNOPSIS...
Building high pressure will bring a prolonged period of hot
temperatures, lasting through the week. Hottest temperatures
are anticipated Wednesday through Friday. Isolated showers and
storms are possible this afternoon and again on Tuesday.
&&
.NEAR TERM /THROUGH TONIGHT/...
KEY MESSAGES:
- Heat begins to build in across the region.
- Weak shortwave may stir isolated showers/storms this afternoon
with the potential for a few storms to have strong/severe
wind gusts.
-------------------------------------------------------------------
Building eastern CONUS ridge will bring quite the stretch of hot
temperatures to the region, with the potential to break heat
records, as noted in the Climate section below. Temperatures are
already in the mid to upper 80's with dewpoints in the 70's
across the region with southerly flow. That being said, with
some plenty of instability and modest shear the only thing
needed will be a boundary/lifting mechanism to start the
generation of showers and storms. Latest hi res model guidance
suggests that the MCV over Lake Erie could be such a lifting
mechanism, with CAMs initiating storms along the lake and
propagating southeastward. Will bump up PoPs in this area and a
bit further west into Ohio where some cu has already developed.
ACARS soundings have steepening low level lapse rates
supportive of a wind threat in any storms that do develop. SPC
does have the region in a Marginal Risk for severe storms today,
which appears to be appropriate given the combination of
ingredients that support the potential for a few strong/severe
storms. Given the influx of moisture on the periphery of the
building ridge, PWAT values will also be increasing, so brief
heavy downpours are also possible.
Cloud cover and showers may be the limiting factor for some
location's hitting forecast high temperatures, but regardless
with increasing dewpoints, heat indices will approach 100
degrees this afternoon across most of the forecast area.
&&
.SHORT TERM /TUESDAY THROUGH WEDNESDAY/...
KEY MESSAGES:
- Heat continues to build through midweek.
- Isolated storms possible Tuesday afternoon.
- Dry and hot Wednesday.
-------------------------------------------------------------------
Ridge will continue to amplify on Tuesday, allowing surface heat
to slowly increase. As with Monday, high temperatures Tuesday
will depend heavily on the development of cu and possible
afternoon showers and storms. CAMs are showing convection firing
Tuesday afternoon, with focus on the higher elevations. This is
due to the low level flow on the backside of the Atlantic high.
A southeasterly surface wind will enhance orographic effects
which could be enough to overcome the subsidence from the very
strong ridge. If convection does fire Tuesday afternoon,
outflows from storms could run down the western side of the
ridges and develop more activity away from the mountains. This
threat should come into better focus over the next couple of
model runs.
Probabilities for high temperatures > 95 on Tuesday increase and
overspread more of the area. The most likely areas remain in the
valleys and rural areas, but probs of 40 to 50% are now spread
across a large portion of the region outside of the higher
elevations.
Ridge will be firmly in place by Wednesday with ensembles
showing heights of 597-599dm. 850 temperatures will remain very
warm and if much of the area stays dry Monday and Tuesday, we
could see even hotter temperatures on Wednesday. The threat for
convection should decrease on Wednesday with the region well
underneath the large ridge. CAM models are showing no activity
on Wednesday, which is in agreement with other operational
models as well.
Probs of > 95 degrees on Wednesday continue to increase with 40
to 60% covering most of the region outside of the mountains.
With hotter temperatures and high dewpoints, heat indices will
remain near or above 100 Tuesday and Wednesday.
&&
.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
KEY MESSAGES:
- High confidence in a dangerous heat wave holding through the
end of the week with heat impacts possible.
- Probabilities are pointing to Thursday and Friday being the
hottest days of the week.
-------------------------------------------------------------------
The highly anomalous ridge will remain in place Thursday, but
ensemble data is now hinting the ridge will begin to slowly weaken
on Friday.
Thursday and Friday should be dry as the area will remain under
the influence of the ridge's subsidence.
Probabilities for high temperatures > 95 both Thursday and
Friday are the highest of the week. The higher probabilities
are also spread out more Thursday and Friday. Generally looking
at probs of 50 to 80% both days.
With surface dewpoints remaining in the upper 60s to lower 70s,
heat indices will continue to hold right around 100 degrees.
This would mean at least 5 days of daytime heat indices near 100
degrees.
Considering heat effect will be cumulative, late week is looking
particularly dangerous. The early season event, and
temperatures increasing slightly each day, will compound any
existing heat issues.
Potential impacts include heightened heat-related illnesses and
power grid issues with increased demand. It is strongly
encouraged to know where cooling shelters are located and stay
hydrated. There may be little relief at night. Make a list of
friends and family to check on and help them prepare.
Prolonged exposure to excessive heat was the primary cause of
weather-related fatalities in 2023.
This certainly is increasing slightly that there will be some
relaxation to the heat by early next week, but any relaxation
will still leave temperatures well above average. In the
Saturday-Sunday timeframe, all clusters reflect some flattening
of the ridge, but disagree on the degree of flattening. Some
maintain zonal flow or perhaps even weak eastern troughing early
next week, but even the coolest scenarios have temperatures
around average to start next week. The warmest scenarios
maintain near-record heat. SHould we stay quasi-zonal into next
week, we may get slight relief, but there as a notable fraction
on ensemble guidance that redevelops eastern ridging. CPC
maintains a moderate risk of excessive heat through 6/24.
Please see the Climate section below for more numerical details on
the kinds of records that may be in jeopardy.
&&
.AVIATION /16Z MONDAY THROUGH FRIDAY/...
Building high pressure will keep VFR conditions with light winds
in the forecast through the TAF period. The exception to this
may be isolated storms this afternoon as a weak shortwave
passes. However, strong subsidence with the building ridge is
likely to limit convective development, and with weak flow,
confidence is low on the location of any storms that do form.
Due to low probability and low confidence of
occurrence/location, have opted to not mention impacts in the
TAFs with this package.
.Outlook...
High probability for VFR and dry weather through the week as
strong ridging develops aloft.
The only variance may come with isolated afternoon convection
on Tuesday, but upper ridging should suppress coverage and
potential initiation.
&&
.CLIMATE...
The area has the potential to break various heat-related
records.
There is low probability that climate sites approach the
highest temperatures recorded in the 21st century:
Pittsburgh, PA: 98F (7/7/2012)
Wheeling, WV: 98F (7/7/2012)
Morgantown, WV: 101F (7/7/2012)
New Philadelphia, OH: 101F (7/7/2012)
Zanesville, OH: 101F (7/7/2012)
DuBois, PA: 101F (7/22/2011)
There is a modest probability many June all-time temperature
records may be at stake:
Pittsburgh, PA: 98F (1988)
Wheeling, WV: 100F (1933)
Morgantown, WV: 99F (1893)
New Philadelphia, OH: 99F (1988)
Zanesville, OH: 101F (1988,1934)
DuBois, PA: 92F (1969)
Daily high maximum (left) and high minimum (right) temperature
records are at stake for:
Monday, June 17th
Pittsburgh, PA: 95F (1994) 75F (1892)
Wheeling, WV: 99F (1936) 69F (2004)
Morgantown, WV: 95F (1967) 72F (1939)
New Philadelphia, OH: 95F (1967) 69F (2022)
Zanesville, OH: 99F (1936) 72F (1994)
DuBois, PA: 89F (1994) 66F (1892)
Tuesday, June 18th
Pittsburgh, PA: 97F (1994) 73F (1905)
Wheeling, WV: 95F (1944) 71F (2018)
Morgantown, WV: 95F (1994) 70F (2018)
New Philadelphia, OH: 95F (1994) 72F (2017)
Zanesville, OH: 99F (1944) 73F (1944)
DuBois, PA: 89F (2018) 69F (2018)
Wednesday, June 19th
Pittsburgh, PA: 97F (1994) 74F (1905)
Wheeling, WV: 95F (1933) 70F (2021)
Morgantown, WV: 94F (1994) 72F (2018)
New Philadelphia, OH: 92F (1994) 70F (2018)
Zanesville, OH: 94F (1994) 75F (1897)
DuBois, PA: 87F (2001) 66F (1975)
Thursday, June 20th
Pittsburgh, PA: 95F (1994) 78F (1924)
Wheeling, WV: 97F (1933) 70F (1924)
Morgantown, WV: 99F (1893) 75F (1924)
New Philadelphia, OH: 95F (1994) 71F (2009)
Zanesville, OH: 98F (1934) 75F (1924)
DuBois, PA: 89F (1991) 66F (1996)
Friday, June 21st
Pittsburgh, PA: 95F (1933) 73F (1934)
Wheeling, WV: 99F (1933) 69F (2016)
Morgantown, WV: 95F (1953) 72F (1988)
New Philadelphia, OH: 94F (1994) 72F (2016)
Zanesville, OH: 97F (1988) 72F (1997)
DuBois, PA: 89F (1991) 68F (1988)
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT Friday for PAZ007>009-013>016-
020>022-029-031-073>078.
OH...Heat Advisory until 8 PM EDT Friday for OHZ039>041-048>050-
057>059-068-069.
WV...Heat Advisory until 8 PM EDT Friday for WVZ001>004-012-021-
509>511.
&&
SYNOPSIS...34
NEAR TERM...34
SHORT TERM...22
LONG TERM...22/CL/Milcarek
AVIATION...Rackley/88
CLIMATE...Hazardous Weather Outlook National Weather Service Pittsburgh PA 341 AM EDT Mon Jun 17 2024 OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>022-029- 031-073>078-WVZ001>004-012-021-509>511-180745- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-Armstrong- Washington-Greene-Westmoreland-Higher Elevations of Westmoreland- Fayette-Higher Elevations of Fayette-Indiana- Higher Elevations of Indiana-Hancock-Brooke-Ohio-Marshall-Wetzel- Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- 341 AM EDT Mon Jun 17 2024 ...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT FRIDAY... This Hazardous Weather Outlook is for east central Ohio, western Pennsylvania, and northern West Virginia. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. There is high confidence in a prolonged, potentially dangerous period of excessive heat beginning today that may result in heat- related impacts across the area, especially in traditionally warmer locations like valleys and urban centers. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. There is high confidence in a prolonged, potentially dangerous period of excessive heat continuing through week that may result in heat-related impacts across the area, especially in traditionally warmer locations like valleys and urban centers. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. WVZ512>514-180745- Eastern Preston-Western Tucker-Eastern Tucker- 341 AM EDT Mon Jun 17 2024 This Hazardous Weather Outlook is for northern West Virginia. .DAY ONE...Today and tonight. Heat index values will reach into the mid 80s to low 90s for all but the highest ridges this afternoon. Practice heat safety actions such as proper hydration, watching for signs of heat stress, and taking breaks in the shade or air conditioning. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. A prolonged period of hot weather continues through the week, with heat index values reaching mid 80s to mid 90s each day for all but the highest ridges. Practice heat safety actions such as proper hydration, watching for signs of heat stress, and taking breaks in the shade or air conditioning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Preliminary Local Storm Report...Summary
National Weather Service Pittsburgh PA
219 PM EDT Mon Jun 17 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0115 PM Extreme Heat New Philadelphia 40.46N 81.43W
06/17/2024 M105.0 F Tuscarawas OH Mesonet
Heat Index
0115 PM Extreme Heat Aliquippa 40.59N 80.26W
06/17/2024 M103.0 F Beaver PA Mesonet
Heat Index
0115 PM Extreme Heat Cambridge Airport 39.98N 81.58W
06/17/2024 M101.0 F Guernsey OH AWOS
Heat Index
0115 PM Extreme Heat Triadelphia 40.10N 80.60W
06/17/2024 M101.0 F Ohio WV Mesonet
Heat Index
0115 PM Extreme Heat Leechburg 40.62N 79.60W
06/17/2024 M101.0 F Westmoreland PA Mesonet
Heat Index
0115 PM Extreme Heat New Castle 40.98N 80.30W
06/17/2024 M106.0 F Lawrence PA Mesonet
Heat Index
0118 PM Extreme Heat Fombell 40.80N 80.20W
06/17/2024 M100.0 F Beaver PA Mesonet
Heat Index
0125 PM Extreme Heat Ohioville 40.71N 80.43W
06/17/2024 M106.0 F Beaver PA Mesonet
Heat Index
0125 PM Extreme Heat Rostraver 40.16N 79.80W
06/17/2024 M101.0 F Westmoreland PA Mesonet
Heat Index
0128 PM Extreme Heat Moon Township 40.53N 80.22W
06/17/2024 M103.0 F Allegheny PA Mesonet
Heat Index
0130 PM Extreme Heat Carrollton 40.56N 81.08W
06/17/2024 M100.0 F Carroll OH Mesonet
Heat Index
0130 PM Extreme Heat Indiana 40.58N 79.22W
06/17/2024 M103.0 F Indiana PA Mesonet
Heat Index
0130 PM Extreme Heat Wheeling 40.07N 80.68W
06/17/2024 M101.0 F Ohio WV Mesonet
Heat Index
0132 PM Extreme Heat Merrell Ridge 39.61N 81.17W
06/17/2024 M109.0 F Monroe OH Mesonet
Heat Index
0134 PM Extreme Heat St. Clairsville 40.04N 80.92W
06/17/2024 M102.0 F Belmont OH Mesonet
Heat Index
0135 PM Extreme Heat PITTSBURGH 40.53N 79.87W
06/17/2024 M103.0 F Allegheny PA Mesonet
Heat Index
0135 PM Extreme Heat New Castle 40.98N 80.30W
06/17/2024 M107.0 F Lawrence PA Mesonet
Heat Index
0135 PM Extreme Heat Elizabeth 40.24N 79.85W
06/17/2024 M106.0 F Allegheny PA Mesonet
Heat Index
0135 PM Extreme Heat Lisbon 40.75N 80.70W
06/17/2024 M105.0 F Columbiana OH Mesonet
Heat Index
0135 PM Extreme Heat Lisbon 40.77N 80.77W
06/17/2024 M101.0 F Columbiana OH Mesonet
Heat Index
0135 PM Extreme Heat McKees Rocks 40.47N 80.14W
06/17/2024 M104.0 F Allegheny PA Mesonet
Heat Index
0135 PM Extreme Heat Hampton Township 40.56N 79.93W
06/17/2024 M103.0 F Allegheny PA Mesonet
Heat Index
0138 PM Extreme Heat Freedom 40.71N 80.22W
06/17/2024 M100.0 F Beaver PA Mesonet
Heat Index
0140 PM Extreme Heat Irwin 40.34N 79.70W
06/17/2024 M103.0 F Westmoreland PA Mesonet
Heat Index
0140 PM Extreme Heat 2 SW Bridgeville 40.33N 80.13W
06/17/2024 M100.0 F Allegheny PA Mesonet
Heat Index
&&
EVENT NUMBER PBZ2404849 PBZ2404850 PBZ2404851 PBZ2404852 PBZ2404853
PBZ2404854 PBZ2404848 PBZ2404846 PBZ2404847 PBZ2404845 PBZ2404842
PBZ2404843 PBZ2404844 PBZ2404841 PBZ2404840 PBZ2404833 PBZ2404834
PBZ2404835 PBZ2404836 PBZ2404837 PBZ2404838 PBZ2404839 PBZ2404832
PBZ2404830 PBZ2404831
Craven
CravenPreliminary Local Storm Report...Summary
National Weather Service Pittsburgh PA
238 PM EDT Mon Jun 17 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0138 PM Extreme Heat Freedom 40.71N 80.22W
06/17/2024 M100.0 F Beaver PA Mesonet
Heat Index
0140 PM Extreme Heat Irwin 40.34N 79.70W
06/17/2024 M103.0 F Westmoreland PA Mesonet
Heat Index
0140 PM Extreme Heat 2 SW Bridgeville 40.33N 80.13W
06/17/2024 M100.0 F Allegheny PA Mesonet
Heat Index
0147 PM Extreme Heat Beaver Falls Airport 40.77N 80.40W
06/17/2024 M101.0 F Beaver PA AWOS
Heat Index
0153 PM Extreme Heat New Philadelphia Airpor 40.47N 81.42W
06/17/2024 M101.0 F Tuscarawas OH ASOS
Heat Index
0153 PM Extreme Heat Zanesville Airport 39.95N 81.90W
06/17/2024 M100.0 F Muskingum OH ASOS
Heat Index
0216 PM Extreme Heat Karns City 40.99N 79.73W
06/17/2024 M101.0 F Butler PA Mesonet
Heat Index
0217 PM Extreme Heat Baden 40.66N 80.18W
06/17/2024 M105.0 F Beaver PA Mesonet
Heat Index
0219 PM Extreme Heat Burton 39.66N 80.38W
06/17/2024 M100.0 F Monongalia WV Mesonet
Heat Index
&&
EVENT NUMBER PBZ2404832 PBZ2404830 PBZ2404831 PBZ2404855 PBZ2404856
PBZ2404857 PBZ2404860 PBZ2404859 PBZ2404858
Craven
CravenThe Pittsburgh radar (KPBZ), 63 km away, was scanning. The volume nearest the first event began at 18:43 UTC.
54 thunderstorm wind. Local standard time, as filed.
Trees down and reports of some structural damage around Ford City.
Power lines down along Mercer aveneue.
Trees down in Sharpsville.
Tree down near Sharon and Walnut Street.
Tree down along Golf road.
Roof torn of automotive building.
Trees down in Ellwood City.
Trees down on 7th and 3rd street.
Trees and powerlines down in Fombell.
Tree down along Terrace Avenue.
Trees down in Hopewell Township.
Trees and lines down in Adams Township.
Numerous trees down and transformers blown..
Trees down along Big Sewickley Creek Road.
Trees down along Wellington Drive.
Tree fell on home along Warrendale Road.
Trees down.
Many reports of trees down in the southern portion of Clarion county, including Rimersburg and Adams township.
Trees down along Markman Park road.
Tree uprooted along Boundary Hill road.
Trees down in Madison township.
Trees down along Brandt School Road.
Tree and large branches down along State road near Middlesex road.
Trees down across Bakerstown road near Holy Savior Cemetary.
Trees down at intersection of Glasgow and Ridge road.
Numerous trees and wires down in lower burrell area. Arnold ave, hulton road, diane street, spooky hollow road, wildlife lodge road, claremont drive, and youngwood wood had either trees or wires down.
Trees down at intersection of Glasgow road and Ridge road.
Trees down in Limestone.
Wires down along Greenwood road.
Multiple large branches down.
Wires down.
Large tree snapped and laying along roadway.
Trees down at intersection of Verona road and Brinley drive.
Trees down along Park road.
Wires down along Logan Ferry road.
Wires down along Hill and Armstrong road.
Trees down along Lenora Drive in Franklin Park.
Tree down along Beighley road.
Eighty foot tree uprooted and down on property.
Poles and wires down on Weedy Mill road.
Power lines down along Shafer road.
Numerous trees and wires down between Murrysville and Export.
Trees down along Myers road and Ridge road.
Trees and wires down in Washington township.
Wires down on Kunkle road.
Wires down along Yellowknife street.
A number of trees and wires down around the Jeannette region.
Wires down along Steele road.
Trees down on berlin road and dogwood circle.
Wires down along Morgane Lane and Thorn Run road.
Trees down along Seabright and North Branch Road.
Several trees snapped along Wallace road.
Trees and wires down.
Trees down along Unionville road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2024Every state in 2024This day in weather historyWarnings in Pennsylvania, June 2024
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: 1197614, 1197616, 1197618, 1197619, 1197620, 1197621, 1197622, 1197623, 1197624, 1197625, 1197626, 1197627, 1197630, 1197631, 1197632, 1197636, 1197644, 1197660, 1197674, 1197635, 1197665, 1197634, 1197642, 1197643, 1197648, 1197655, 1197641, 1197666, 1197654, 1197639, 1197646, 1197669, 1197638, 1197668, 1197653, 1197673, 1197675, 1197659, 1197670, 1197671, and more.