Alert archive / Pennsylvania / Flash Flood Warnings in 2021

Flash Flood Warning 30, NWS State College, PA

September 15, 2021Lycoming County, Sullivan County, Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 15, 2021, 2:36 PM EDT for Lycoming County, Sullivan County, Pennsylvania. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 15, 2021, 2:36 PM EDT (18:36 UTC)
Expired: Sep 15, 2021, 3:42 PM EDT
In force: 66 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

Counties Lycoming County, PA, Sullivan County, PA

The radar

The Binghamton radar (KBGM), 108 km from the middle of the area, began a volume at 18:38 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.6 hours before the alert went out and 241 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 236 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

257 
WGUS51 KCTP 151836
FFWCTP
PAC081-113-152045-
/O.NEW.KCTP.FF.W.0030.210915T1836Z-210915T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service State College PA
236 PM EDT Wed Sep 15 2021

The National Weather Service in State College has issued a

* Flash Flood Warning for...
  East Central Lycoming County in north central Pennsylvania...
  Central Sullivan County in north central Pennsylvania...

* Until 445 PM EDT.

* At 236 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Muncy Valley, Kettle Creek Gorge, Laporte, Forksville and Eagles 
  Mere.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4138 7680 4149 7661 4142 7639 4130 7657
      4128 7680

FLASH FLOOD...RADAR INDICATED

$$

CR

1 follow-up statement

790 
WGUS71 KCTP 151942
FFSCTP

Flash Flood Statement
National Weather Service State College PA
342 PM EDT Wed Sep 15 2021

PAC081-113-151952-
/O.CAN.KCTP.FF.W.0030.000000T0000Z-210915T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lycoming PA-Sullivan PA-
342 PM EDT Wed Sep 15 2021

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL LYCOMING AND 
CENTRAL SULLIVAN COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4138 7680 4149 7661 4142 7639 4130 7657
      4128 7680

$$

CR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 11:48 AM EDT	Special Weather Statement	CTP	Warren	42 min
Sep 15, 1:11 PM EDT	Special Weather Statement	CTP	Sullivan	49 min
Sep 15, 1:27 PM EDT	Special Weather Statement	CTP	Centre	33 min
Sep 15, 1:44 PM EDT	Severe Thunderstorm Warning	CTP	Centre	31 min
Sep 15, 1:48 PM EDT	Severe Thunderstorm Warning	CTP	Sullivan	42 min
Sep 15, 2:14 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Sep 15, 2:14 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	31 min
Sep 15, 2:45 PM EDT	Special Weather Statement	CTP	Union	30 min
Sep 15, 2:46 PM EDT	Special Weather Statement	CTP	Sullivan	44 min
Sep 15, 2:54 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Northumberland, Union	36 min
Sep 15, 3:13 PM EDT	Special Weather Statement	CTP	Union	17 min
Sep 15, 3:20 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin	40 min
Sep 15, 3:24 PM EDT	Severe Thunderstorm Warning	CTP	Montour, Northumberland, Union	36 min
Sep 15, 3:30 PM EDT	Special Weather Statement	CTP	Huntingdon	30 min
Sep 15, 3:55 PM EDT	Special Weather Statement	CTP	Snyder	35 min
Sep 15, 3:59 PM EDT	Special Weather Statement	CTP	Columbia, Montour	31 min
Sep 15, 4:03 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Sep 15, 4:12 PM EDT	Flash Flood Warning	CTP	Columbia, Lycoming, Sullivan	3 hr
Sep 15, 4:18 PM EDT	Severe Thunderstorm Warning	CTP	Columbia	27 min
Sep 15, 4:27 PM EDT	Special Weather Statement	CTP	Perry	33 min
Sep 15, 4:36 PM EDT	Special Weather Statement	CTP	Columbia, Northumberland	24 min
Sep 15, 4:43 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Perry	32 min
Sep 15, 4:46 PM EDT	Areal Flood Advisory	CTP	Montour, Northumberland	89 min
Sep 15, 4:58 PM EDT	Special Weather Statement	CTP	Northumberland	32 min
Sep 15, 4:59 PM EDT	Special Weather Statement	CTP	Perry	31 min
Sep 15, 5:15 PM EDT	Special Weather Statement	CTP	Perry	30 min
Sep 15, 5:19 PM EDT	Special Weather Statement	CTP	Franklin	26 min
Sep 15, 5:32 PM EDT	Special Weather Statement	CTP	Dauphin	28 min
Sep 15, 5:37 PM EDT	Special Weather Statement	CTP	Schuylkill	23 min
Sep 15, 5:54 PM EDT	Special Weather Statement	CTP	Lebanon	36 min
Sep 15, 6:16 PM EDT	Special Weather Statement	CTP	York	29 min
Sep 15, 6:17 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	43 min
Sep 15, 6:24 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	27 min
Sep 15, 6:41 PM EDT	Special Weather Statement	CTP	Dauphin	34 min
Sep 15, 6:54 PM EDT	Special Weather Statement	CTP	Berks	21 min
Sep 15, 7:09 PM EDT	Areal Flood Advisory	CTP	Dauphin, York	96 min

Nearby

Flash Flood Warnings in Pennsylvania, 2021 Every flash flood warning 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.