Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 3, NWS State College, PA
NWS State College, PA issued this areal flood advisory at Apr 11, 2021, 9:29 PM EDT for 4 counties in Pennsylvania. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Apr 11, 2021, 9:29 PM EDT (01:29 UTC)
- Expired
- Apr 11, 2021, 11:30 PM EDT
- In force
- 2 hr
- Issued by
- NWS State College, PA
- Area
- Storm-based polygon
Counties Adams County, PA, Cumberland County, PA, Lancaster County, PA, York County, PA
The radar
The Sterling radar (KLWX), 126 km from the middle of the area, began a volume at 01:29 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, 1.5 hours before the alert went out and 125 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
- 154 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 2014 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood 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 areal flood advisory went out at Apr 11, 6:42 PM EDT, 2 hours 47 minutes earlier.
Area forecast discussion, Apr 11, 6:42 PM EDT, 2 hours 47 minutes before
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</html>Hazardous weather outlook, Apr 11, 3:08 AM EDT, 18 hours 21 minutes before
Hazardous Weather Outlook National Weather Service State College PA 308 AM EDT Sun Apr 11 2021 PAZ004>006-010>012-017>019-024>026-033>035-037-041-042-045-046-049- 051>053-058-120715- Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield- Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Somerset- Bedford-Fulton-Tioga-Northern Lycoming-Sullivan-Southern Clinton- Southern Lycoming-Union-Montour-Northumberland-Columbia-Schuylkill- 308 AM EDT Sun Apr 11 2021 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...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ027-028-036-050-056-057-059-063>066-120715- Mifflin-Juniata-Franklin-Snyder-Perry-Dauphin-Lebanon-Cumberland- Adams-York-Lancaster- 308 AM EDT Sun Apr 11 2021 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and tonight. Isolated strong to marginally severe thunderstorms with gusty winds and small hail are possible this afternoon into early evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday. 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 |
|---|---|---|---|---|
| Apr 11, 8:00 PM EDT | Special Weather Statement | CTP | Perry | 15 min |
| Apr 11, 8:28 PM EDT | Special Weather Statement | CTP | Franklin | 17 min |
| Apr 11, 8:47 PM EDT | Special Weather Statement | CTP | Franklin | 13 min |
| Apr 11, 9:03 PM EDT | Special Weather Statement | CTP | York | 42 min |
| Apr 11, 9:10 PM EDT | Special Weather Statement | CTP | Cumberland | 35 min |
| Apr 11, 11:28 PM EDT | Areal Flood Advisory | CTP | Lancaster | 2 hr |
Nearby
Areal Flood Advisories in Pennsylvania, 2021Every areal flood advisory in 2021
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.