Alert archive / Pennsylvania / Flash Flood Watches in 2009

Flash Flood Watch 1, NWS State College, PA

June 11, 200927 counties in Pennsylvania

NWS State College, PA issued this flash flood watch at Jun 11, 2009, 4:04 AM EDT for 27 counties in Pennsylvania. It took effect at Jun 11, 2009, 4:00 PM EDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Jun 11, 2009, 4:04 AM EDT (08:04 UTC)
In effect from: Jun 11, 2009, 4:00 PM EDT
Expired: Jun 12, 2009, 3:07 AM EDT
In force: 11 hr
Issued by: NWS State College, PA
Flood severity: None

All 27 counties

Adams County, PA, Bedford County, PA, Blair County, PA, Cambria County, PA, Centre County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, York County, PA

The radar

The State College radar (KCCX), 69 km from the middle of the area, began a volume at 08:07 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, 8.1 hours before the alert went out and 181 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: 817 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 993 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

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 Jun 11, 2:46 AM EDT, 1 hour 18 minutes earlier.

Area forecast discussion, Jun 11, 2:46 AM EDT, 1 hour 18 minutes before

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Hazardous weather outlook, Jun 10, 9:52 PM EDT, 6 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
952 PM EDT WED JUN 10 2009

PAZ017>019-024>028-033>036-045-046-049>053-056>059-063>066-120200-
CLEARFIELD-NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-
MIFFLIN-JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-SOUTHERN CLINTON-
SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-
DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-YORK-LANCASTER-
952 PM EDT WED JUN 10 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

HEAVY SHOWERS AND SCATTERED...SLOW MOVING THUNDERSTORMS WILL
BRING ANOTHER 1 TO 2 INCHES OF RAINFALL TO SOME LOCATIONS IN JUST
A 60 TO 90 MINUTE PERIOD TONIGHT. THIS HEAVY RAIN WILL LEAD TO
RAPID RISES ON STREAMS AND CREEKS AND PRODUCE FLOODING OF POOR
DRAINAGE AREAS IN CITIES AND TOWNS. THE HEAVIEST RAIN WILL BE
CONFINED TO THE REGION NEAR AND TO THE SOUTH OF INTERSTATE 81.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON
AND EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT AND AGAIN THURSDAY
AFTERNOON AND EVENING.

PAZ004>006-010>012-037-041-042-120200-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-TIOGA-
NORTHERN LYCOMING-SULLIVAN-
952 PM EDT WED JUN 10 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

LAMBERT

In the hours before

Local storm report, Jun 10, 10:20 PM EDT, 5 hours 44 minutes before

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Local storm report, Jun 10, 10:37 PM EDT, 5 hours 27 minutes before

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Local storm report, Jun 10, 11:31 PM EDT, 4 hours 33 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 8:06 PM EDT	Special Weather Statement	CTP	Franklin	54 min
Jun 10, 8:14 PM EDT	Areal Flood Advisory	CTP	Cumberland, Perry	2 hr
Jun 10, 8:55 PM EDT	Special Weather Statement	CTP	Lycoming	65 min
Jun 10, 9:06 PM EDT	Areal Flood Advisory	CTP	Franklin	114 min
Jun 10, 9:08 PM EDT	Special Weather Statement	CTP	Franklin	22 min
Jun 10, 9:23 PM EDT	Flash Flood Warning	CTP	Franklin	3 hr
Jun 10, 9:40 PM EDT	Areal Flood Advisory	CTP	Dauphin, Lancaster, Lebanon, York	3 hr
Jun 10, 9:55 PM EDT	Flash Flood Warning	CTP	Dauphin, Lancaster, Lebanon	4 hr
Jun 10, 10:57 PM EDT	Areal Flood Advisory	CTP	Lebanon, Schuylkill	2 hr
Jun 11, 5:00 PM EDT	Special Weather Statement	CTP	Juniata	60 min
Jun 11, 5:38 PM EDT	Areal Flood Advisory	CTP	Elk, McKean, Warren	112 min
Jun 11, 6:16 PM EDT	Special Weather Statement	CTP	Bedford	29 min
Jun 11, 7:08 PM EDT	Special Weather Statement	CTP	Huntingdon	67 min

Nearby

Flash Flood Watches in Pennsylvania, 2009 Every flash flood watch in 2009

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.