Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 19, NWS State College, PA

May 24, 2009Juniata County, Mifflin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 24, 2009, 4:59 PM EDT for Juniata County, Mifflin County, Pennsylvania. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 24, 2009, 4:59 PM EDT (20:59 UTC)
Expired: May 24, 2009, 5:45 PM EDT
In force: 46 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Juniata County, PA, Mifflin County, PA

The radar

The State College radar (KCCX), 57 km from the middle of the area, began a volume at 20:59 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 12:00Z, 9.0 hours before the alert went out and 180 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: 222 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 24, 4:02 PM EDT, 57 minutes earlier.

Area forecast discussion, May 24, 4:02 PM EDT, 57 minutes before

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Hazardous weather outlook, May 24, 7:39 AM EDT, 9 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
739 AM EDT SUN MAY 24 2009

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-251145-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-
JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-
ADAMS-YORK-LANCASTER-
739 AM EDT SUN MAY 24 2009

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.

STEINBUGL

In the hours before

Special weather statement, May 24, 2:45 PM EDT, 2 hours 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
245 PM EDT SUN MAY 24 2009

PAZ041-046-241930-
NORTHERN LYCOMING PA-SOUTHERN LYCOMING PA-
245 PM EDT SUN MAY 24 2009

...A STRONG THUNDERSTORM WILL AFFECT EASTERN LYCOMING COUNTY...

AT 243 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR
MONTOURSVILLE...MOVING SOUTHEAST AT 10 MPH.

WIND GUSTS TO 30 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS.

THIS STORM WILL BE NEAR COGAN STATION AROUND 250 PM...LOYALSOCKVILLE
AROUND 310 PM AND MONTOURSVILLE AROUND 330 PM.

THIS WILL IMPACT I-180 BETWEEN MILE MARKERS 14 AND 26.

LAT...LON 4128 7666 4115 7691 4138 7714 4150 7696

EXPERIMENTAL

FORECASTER: STEINBUGL

Special weather statement, May 24, 3:43 PM EDT, 1 hour 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
343 PM EDT SUN MAY 24 2009

PAZ045-046-049-051>053-242045-
COLUMBIA PA-MONTOUR PA-NORTHUMBERLAND PA-SOUTHERN CLINTON PA-
SOUTHERN LYCOMING PA-UNION PA-
343 PM EDT SUN MAY 24 2009

...STRONG THUNDERSTORMS WILL AFFECT MONTOUR...NORTHWESTERN
NORTHUMBERLAND...SOUTHEASTERN CLINTON...SOUTHEASTERN LYCOMING...UNION
AND WEST CENTRAL COLUMBIA COUNTIES...

AT 340 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 10 MILES
EAST OF MONTOURSVILLE TO MONTOURSVILLE TO JERSEY SHORE...MOVING
SOUTHEAST AT 15 MPH.

HEAVY DOWNPOURS...WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE
POSSIBLE WITH THESE STORMS.

THESE STORMS WILL BE NEAR LAIRDSVILLE...AND COLLOMSVILLE AROUND 350
PM...MONTGOMERY AROUND 400 PM...ELIMSPORT AROUND 405 PM...DELAWARE
RUN...AND CARROLL AROUND 410 PM...EXCHANGE AROUND 415 PM...
TURBOTVILLE AND ALLENWOOD AROUND 425 PM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...
I-80 BETWEEN MILE MARKERS 188 AND 234...I-180 BETWEEN MILE MARKERS 1
AND 29.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY
147...ROUTE 11...ROUTE 15...ROUTE 220...STATE ROAD 45...STATE ROAD
118.

LAT...LON 4096 7638 4094 7667 4086 7711 4099 7721
      4103 7716 4102 7723 4120 7737 4125 7727
      4130 7695 4127 7665

EXPERIMENTAL

FORECASTER: DEVOIR

Special weather statement, May 24, 4:20 PM EDT, 39 minutes before

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Special weather statement, May 24, 4:39 PM EDT, 20 minutes before

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Special weather statement, May 24, 4:58 PM EDT, 1 minute 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
May 23, 10:38 PM EDT	Flash Flood Warning	CTP	Bedford, Fulton	3 hr
May 24, 2:45 PM EDT	Special Weather Statement	CTP	Lycoming	45 min
May 24, 3:09 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming	66 min
May 24, 3:34 PM EDT	Flash Flood Warning	CTP	Bedford	3 hr
May 24, 3:43 PM EDT	Special Weather Statement	CTP	Montour, Union	62 min
May 24, 3:54 PM EDT	Flash Flood Warning	CTP	Bedford, Somerset	3 hr
May 24, 4:20 PM EDT	Special Weather Statement	CTP	Snyder	40 min
May 24, 4:39 PM EDT	Special Weather Statement	CTP	Montour, Northumberland, Snyder	36 min
May 24, 4:58 PM EDT	Special Weather Statement	CTP	Juniata, Mifflin, Northumberland, Snyder	47 min
May 24, 5:44 PM EDT	Special Weather Statement	CTP	Huntingdon, Juniata, Perry, Schuylkill	46 min
May 24, 6:21 PM EDT	Areal Flood Advisory	CTP	Somerset	3 hr
May 24, 6:28 PM EDT	Special Weather Statement	CTP	Schuylkill	32 min
May 24, 6:53 PM EDT	Special Weather Statement	CTP	Cumberland, Lebanon	37 min
May 24, 7:04 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Juniata, Perry	56 min
May 24, 7:34 PM EDT	Special Weather Statement	CTP	Cumberland	56 min
May 24, 7:48 PM EDT	Special Weather Statement	CTP	Huntingdon	57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009 Every severe thunderstorm warning 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.