Alert archive / Pennsylvania / Flash Flood Warnings in 2018

Flash Flood Warning 9, NWS Cleveland, OH

July 5, 2018Crawford County, Pennsylvania

NWS Cleveland, OH issued this flash flood warning at Jul 5, 2018, 12:34 PM EDT for Crawford County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 5, 2018, 12:34 PM EDT (16:34 UTC)
Expired: Jul 5, 2018, 3:10 PM EDT
In force: 3 hr
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Flood severity: None

County Crawford County, PA

The radar

The Pittsburgh radar (KPBZ), 112 km from the middle of the area, began a volume at 16:35 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 (KAGC), launched 12:00Z, 4.6 hours before the alert went out and 126 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: 1207 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 888 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

087 
WGUS51 KCLE 051634
FFWCLE
PAC039-052030-
/O.NEW.KCLE.FF.W.0009.180705T1634Z-180705T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cleveland OH
1234 PM EDT THU JUL 5 2018

The National Weather Service in Cleveland has issued a

* Flash Flood Warning for...
  Southwestern Crawford County in northwestern Pennsylvania...

* Until 430 PM EDT.

* At 1230 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain and moving into the warned area. Up to two inches of 
  rain have already fallen in some areas. Flash flooding is expected 
  to begin shortly.

* Some locations that will experience flooding include...
  Meadville, Linesville, Harmonsburg, Adamsville, Pymatuning North,
  Pymatuning Central, Atlantic, Cochranton, Saegertown, Conneaut
  Lake, Jamestown, Conneaut Lakeshore, Geneva and Hartstown.

Additional rainfall amounts of 2 inches are possible in the warned 
area.

LAT...LON 4149 8000 4149 8009 4148 8015 4149 8043
      4149 8052 4172 8052 4172 8015 4150 7998

$$

LaPlante

1 follow-up statement

578 
WGUS71 KCLE 051910
FFSCLE

Flash Flood Statement
National Weather Service Cleveland OH
310 PM EDT THU JUL 5 2018

PAC039-051920-
/O.CAN.KCLE.FF.W.0009.000000T0000Z-180705T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Crawford PA-
310 PM EDT THU JUL 5 2018

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN CRAWFORD COUNTY IS
CANCELLED...

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

LAT...LON 4149 8000 4149 8009 4148 8015 4149 8043
      4149 8052 4172 8052 4172 8015 4150 7998

$$

LaPlante

The office that day

Everything else NWS Cleveland, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 8:42 PM EDT	Areal Flood Advisory	CLE	Crawford	3 hr
Jul 5, 11:06 AM EDT	Special Weather Statement	CLE	Crawford	24 min
Jul 5, 11:54 AM EDT	Special Weather Statement	CLE	Crawford	66 min

Nearby

Flash Flood Warnings in Pennsylvania, 2018 Every flash flood warning in 2018

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.