Alert archive / Pennsylvania / Flash Flood Watches in 2020
Flash Flood Watch 10, NWS State College, PA
NWS State College, PA issued this flash flood watch at Aug 13, 2020, 2:22 AM EDT for Lancaster County, York County, Pennsylvania. It took effect at Aug 13, 2020, 11:00 AM EDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 13, 2020, 2:22 AM EDT (06:22 UTC)
- In effect from
- Aug 13, 2020, 11:00 AM EDT
- Expired
- Aug 13, 2020, 7:53 PM EDT
- In force
- 9 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Lancaster County, PA, York County, PA
The radar
The Sterling radar (KLWX), 141 km from the middle of the area, began a volume at 06:24 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
Pittsburgh, PA (KPIT), launched 00:00Z, 6.4 hours before the alert went out and 311 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.
- Mixed-layer CAPE
- 159 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 1367 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Aug 12, 7:47 PM EDT, 6 hours 35 minutes earlier.
Area forecast discussion, Aug 12, 7:47 PM EDT, 6 hours 35 minutes before
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</html>Hazardous weather outlook, Aug 12, 12:08 PM EDT, 14 hours 14 minutes before
Hazardous Weather Outlook National Weather Service State College PA 1208 PM EDT Wed Aug 12 2020 PAZ004>006-010>012-017>019-024>028-037-041-042-045-046-049>053- 131615- Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield- Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin- Juniata-Tioga-Northern Lycoming-Sullivan-Southern Clinton- Southern Lycoming-Union-Snyder-Montour-Northumberland-Columbia- 1208 PM EDT Wed Aug 12 2020 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...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ033>036-056>059-063-064-131615- Somerset-Bedford-Fulton-Franklin-Perry-Dauphin-Schuylkill-Lebanon- Cumberland-Adams- 1208 PM EDT Wed Aug 12 2020 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Heavy rainfall from slow-moving showers and thunderstorms may lead to minor flooding today along with localized strong wind gusts over 45 mph. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ065-066-131615- York-Lancaster- 1208 PM EDT Wed Aug 12 2020 ...FLASH FLOOD WATCH IN EFFECT UNTIL 11 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. Flash Flood Watch. In addition, some of the thunderstorm could contain highly localized, strong, downburst wind gusts in excess of 55 mph. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather.
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:45 PM EDT | Areal Flood Advisory | CTP | Bedford, Somerset | 60 min |
Nearby
Flash Flood Watches in Pennsylvania, 2020Every flash flood watch 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.