Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 19, NWS Cleveland, OH

May 14, 2011Crawford County, Pennsylvania

NWS Cleveland, OH issued this flash flood warning at May 14, 2011, 9:21 PM EDT for Crawford County, Pennsylvania. It was in force for 4 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 14, 2011, 9:21 PM EDT (01:21 UTC)
Expired: May 15, 2011, 1:30 AM EDT
In force: 4 hr
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Flood severity: None

County Crawford County, PA

The radar

The Pittsburgh radar (KPBZ), 125 km from the middle of the area, began a volume at 01:21 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.

What was reported inside it

Time	Report	Where	Remark
May 14, 11:55 PM EDT	FLASH FLOOD	Linesville, PA	A FEW ROADS CLOSED...SOME VEHICLES STRANDED AND MANY FLOODED BASEMENTS.
May 15, 12:00 AM EDT	FLASH FLOOD	Linesville, PA	SEVERAL ROADS AND DRIVEWAYS WASHOUT IN HEAVY RAIN IN LINESVILLE. FLOOD DAMAGE TO CONSTRUCTION SITE OF NEW SEWER SYSTEM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 1.4 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-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: 283 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

627 
WGUS51 KCLE 150121
FFWCLE
PAC039-150530-
/O.NEW.KCLE.FF.W.0019.110515T0121Z-110515T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CLEVELAND OH
921 PM EDT SAT MAY 14 2011

THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CRAWFORD COUNTY IN NORTHWEST PENNSYLVANIA

* UNTIL 130 AM EDT

* AT 915 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL WILL BE MOVING  
  ACROSS THE WARNED AREA. RAINFALL AMOUNTS MAY BE IN THE 1 TO 2 INCH 
  RANGE. THE GROUND IS SATURATED SO THIS ADDITIONAL RAINFALL MAY     
  CAUSE FLOODING.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MEADVILLE...CAMBRIDGE SPRINGS...LINESVILLE...SPARTANSBURG AND
  TITUSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAINFALL IS POSSIBLE IN THE WARNED AREA. EXCESSIVE RUNOFF
WILL CAUSE FLOODING OF SMALL CREEKS...STREAMS...AND DRAINAGE DITCHES
ACROSS THE WARNING AREA. IN URBAN AREAS...FLOODING IS LIKELY ALONG
POORLY DRAINED AND LOW LYING HIGHWAYS...STREETS...AND UNDERPASSES. BE
ALERT FOR FLOODED ROADS. TURN AROUND...DON'T DROWN!

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF DRIVING...SLOW DOWN! BE ALERT FOR LOW
SPOTS...DIPS...AND UNDERPASSES WHICH MAY BE FLOODED. PEOPLE IN LOW
LYING AREAS ALONG CREEKS AND STREAMS SHOULD MOVE TO HIGHER GROUND TO
ESCAPE RISING WATER LEVELS.

&&

LAT...LON 4161 7965 4162 7982 4151 8000 4149 8000
      4149 8052 4185 8052 4184 7963 4166 7962
      4162 7962

$$

KIELTYKA

1 follow-up statement

675 
WGUS71 KCLE 150400
FFSCLE

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
1200 AM EDT SUN MAY 15 2011

PAC039-150530-
/O.CON.KCLE.FF.W.0019.000000T0000Z-110515T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CRAWFORD PA-
1200 AM EDT SUN MAY 15 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CRAWFORD COUNTY IN
NORTHWEST PENNSYLVANIA UNTIL 130 AM EDT...

AT 1151 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT FLASH 
FLOODING WAS OCCURRING NEAR LINESVILLE. SOME ROADS WERE IMPASSABLE 
SUCH AS MAPLES ROAD AND A PORTION OF HIGHWAY 6. MODERATE RAINFALL 
CONTINUES TO MOVE ACROSS THE COUNTY AND POSES AN ADDITIONAL FLOODING 
THREAT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF DRIVING...SLOW DOWN! BE ALERT FOR LOW
SPOTS...DIPS...AND UNDERPASSES WHICH MAY BE FLOODED. PEOPLE IN LOW
LYING AREAS ALONG CREEKS AND STREAMS SHOULD MOVE TO HIGHER GROUND TO
ESCAPE RISING WATER LEVELS.

&&

LAT...LON 4161 7965 4162 7982 4151 8000 4149 8000
      4149 8052 4185 8052 4184 7963 4166 7962
      4162 7962

$$

OUDEMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 1:32 AM EDT	Areal Flood Advisory	CLE	Crawford	6 hr
May 15, 10:34 AM EDT	Areal Flood Warning	CLE	Crawford, Erie	9 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2011 Every flash flood warning in 2011

Sources

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