Alert archive / Pennsylvania / Heat Advisories in 2020

Heat Advisory 2, NWS State College, PA

July 22, 20208 counties in Pennsylvania

NWS State College, PA issued this heat advisory at Jul 22, 2020, 3:13 AM EDT for 8 counties in Pennsylvania. It took effect at Jul 22, 2020, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jul 22, 2020, 3:13 AM EDT (07:13 UTC)
In effect from
Jul 22, 2020, 12:00 PM EDT
Expired
Jul 22, 2020, 8:00 PM EDT
In force
8 hr
Issued by
NWS State College, PA

Counties Adams County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Lancaster County, PA, Lebanon County, PA, Perry County, PA, York County, PA

The radar

The State College radar (KCCX), 124 km from the middle of the area, began a volume at 07:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.2 hours before the alert went out and 137 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2020-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 581 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2020-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
581 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
2012 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, 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 this heat advisory went out at Jul 22, 2:41 AM EDT, 32 minutes earlier.

Area forecast discussion, Jul 22, 2:41 AM EDT, 32 minutes before
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Hazardous weather outlook, Jul 21, 5:29 AM EDT, 21 hours 44 minutes before
Hazardous Weather Outlook
National Weather Service State College PA
529 AM EDT Tue Jul 21 2020

PAZ004>006-220930-
Warren-McKean-Potter-
529 AM EDT Tue Jul 21 2020

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Isolated strong to severe thunderstorms with gusty winds and locally
heavy rain are possible Wednesday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ010-011-017-024-033-220930-
Elk-Cameron-Clearfield-Cambria-Somerset-
529 AM EDT Tue Jul 21 2020

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Slow-moving thunderstorms may produce isolated strong gusty winds
and flooding this afternoon. Isolated flooding is most likely in
areas that can experience rapid runoff from heavy rainfall.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Isolated strong to severe thunderstorms with gusty winds and locally
heavy rain are possible Wednesday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ012-037-041-042-045-046-051-053-220930-
Northern Clinton-Tioga-Northern Lycoming-Sullivan-Southern Clinton-
Southern Lycoming-Montour-Columbia-
529 AM EDT Tue Jul 21 2020

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Scattered severe thunderstorms with damaging winds 60 mph or greater
are possible Wednesday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ018-019-025>028-034-035-049-050-052-220930-
Northern Centre-Southern Centre-Blair-Huntingdon-Mifflin-Juniata-
Bedford-Fulton-Union-Snyder-Northumberland-
529 AM EDT Tue Jul 21 2020

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Slow-moving thunderstorms may produce gusty winds and localized
flooding this afternoon. Localized flooding is most likely
in areas that can experience rapid runoff from heavy rainfall.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Scattered severe thunderstorms with damaging winds 60 mph or greater
are possible Wednesday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ036-056>059-063>066-220930-
Franklin-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-Adams-York-
Lancaster-
529 AM EDT Tue Jul 21 2020

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Slow-moving thunderstorms may produce gusty winds and localized
flooding this afternoon. Localized flooding is most likely in areas
that can experience rapid runoff from heavy rainfall.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Scattered severe thunderstorms with damaging winds 60 mph or greater
are possible Wednesday afternoon.

Maximum heat indices around 100 degrees are probable Wednesday
afternoon.

Isolated strong to severe thunderstorms with gusty winds are
possible Thursday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

MRS

In the hours before

Local storm report, Jul 21, 11:07 PM EDT, 4 hours 6 minutes before
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Local storm report, Jul 21, 11:09 PM EDT, 4 hours 4 minutes before
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Local storm report, Jul 21, 11:13 PM EDT, 4 hours before
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The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 8:08 PM EDTSpecial Weather StatementCTPLancaster37 min
Jul 22, 12:02 PM EDTSpecial Weather StatementCTPSomerset28 min
Jul 22, 12:47 PM EDTSpecial Weather StatementCTPBedford28 min
Jul 22, 1:29 PM EDTSpecial Weather StatementCTPHuntingdon31 min
Jul 22, 1:38 PM EDTSevere Thunderstorm WarningCTPAdams, York67 min
Jul 22, 2:01 PM EDTSpecial Weather StatementCTPFulton29 min
Jul 22, 2:09 PM EDTSevere Thunderstorm WarningCTPFranklin, Fulton49 min
Jul 22, 2:56 PM EDTSpecial Weather StatementCTPAdams, Cumberland34 min
Jul 22, 3:03 PM EDTSpecial Weather StatementCTPYork42 min
Jul 22, 3:12 PM EDTAreal Flood AdvisoryCTPAdams, York3 hr
Jul 22, 3:13 PM EDTSpecial Weather StatementCTPSullivan32 min
Jul 22, 3:21 PM EDTSpecial Weather StatementCTPLebanon24 min
Jul 22, 3:28 PM EDTSpecial Weather StatementCTPAdams32 min
Jul 22, 3:39 PM EDTSevere Thunderstorm WarningCTPLancaster, York36 min
Jul 22, 3:46 PM EDTSpecial Weather StatementCTPLebanon29 min
Jul 22, 3:53 PM EDTAreal Flood AdvisoryCTPYork3 hr
Jul 22, 4:00 PM EDTSpecial Weather StatementCTPYork30 min

Nearby

Heat Advisories in Pennsylvania, 2020Every heat advisory in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.