Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 135, NWS State College, PA

July 11, 2001Columbia County, Montour County, Northumberland County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 11, 2001, 4:08 AM EDT for Columbia County, Montour County, Northumberland County, Pennsylvania. It was in force for 67 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: Jul 11, 2001, 4:08 AM EDT (08:08 UTC)
Expired: Jul 11, 2001, 5:15 AM EDT
In force: 67 min
Issued by: NWS State College, PA
Area: Whole counties

Counties Columbia County, PA, Montour County, PA, Northumberland County, PA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 11, 3:30 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 8.1 hours before the alert went out and 236 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: 1814 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1561 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KCTP 110810
SVRCTP

PAC037-093-097-119-110915-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
408 AM EDT WED JUL 11 2001

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONTOUR COUNTY IN PENNSYLVANIA
  COLUMBIA COUNTY IN PENNSYLVANIA
  UNION COUNTY IN PENNSYLVANIA
  NORTHUMBERLAND COUNTY IN PENNSYLVANIA

* UNTIL 515 AM EDT.

* AT 405 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND STORM
  POTTERS INDICATED A SEVERE THUNDERSTORM OVER WILLIAMSPORT...MOVING
  EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DELAWARE RUN AND ALLENWOOD AT 415 AM.
  WATSONTOWN AND NEW COLUMBIA AT 420 AM.
  WEST MILTON AT 425 AM.
  EXCHANGE AND MOORESBURG AT 435 AM.
  JERSEYTOWN AT 445 AM.
  MECHANICSVILLE AND DANVILLE AT 450 AM.

REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR 
NO ADVANCED WARNING. GOLF BALL SIZE HAIL WAS REPORTED IN 
WILLIAMSPORT WITH THIS STORM...AND A 60 MPH WIND GUST WAS REPORTED 
AT THE WILLIAMSPORT REGIONAL AIRPORT.

THIS IS A DANGEROUS STORM WITH DAMAGING WINDS AND LARGE HAIL. STAY
INDOORS AWAY FROM UWINDOWS.

$$

LAT...LON 4117 7700 4099 7698 4090 7622 4118 7632

DANGELO

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 Jul 11, 2:20 AM EDT, 1 hour 48 minutes earlier.

Area forecast discussion, Jul 11, 2:20 AM EDT, 1 hour 48 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
220 AM EDT WED JUL 11 2001

COLD FRONT IS SLOWLY SAGGING SOUTH ACROSS PA EARLY THIS MORNING.
MEANWHILE A STRONG SHORT WAVE MOVING EAST ACROSS NY STATE HAS BEEN
MAINTAINING THUNDERSTORMS ALONG AND NORTH OF THE FRONT ACROSS
NORTHERN PA OVERNIGHT. THESE STORMS REFUSE TO WEAKEN...AND WILL
PROBABLY HOLD TOGETHER ACROSS THE NORTHEAST COUNTIES UNTIL AFTER
SUNRISE. WILL MENTION SOME EARLY MORNING THUNDERSTORMS WITH POPS
DEPENDENT ON LAST MINUTE RADAR TRENDS.

LOW-LVLS DRY OUT RAPIDLY TODAY. THEREFORE DESPITE FAIRLY COLD MID
LEVELS DON'T EXPECT MUCH CONVECTION THIS AFTERNOON. WILL DROP THE 30
POPS IN MOST PLACES FOR THIS AFTERNOON BUT KEEP IT GOING FOR THE
NORTHEAST AND EAST CENTRAL COUNTIES CLOSEST TO THE UPPER LOW.
FWC/FAN GUIDANCE NUMBERS ARE CLOSE AND WILL NOT STRAY MUCH.

TONIGHT WILL BE MOSTLY CLEAR AND COOL. CAN'T RULE OUT A FEW SHOWERS
POPING UP AGAIN ON THURSDAY WITH COLD AIR ALOFT AND POSSIBLY ANOTHER
SHORT WAVE ROTATING AROUND THE UPPER LOW...BUT WITH NOTHING IN THE
FORECAST CURRENTLY AND COVERAGE EXPECTED TO BE LOW WILL LEAVE OUT
FOR NOW.

IN THE EXTENDED PERIODS OUR CUnRRENT FORECAST OF DRY WITH TEMPS
MODERATING TO NEAR NORMAL CONTINUES TO LOOK REASONABLE AND WILL NOT
CHANGE.

.CTP...NONE.

MSE

In the hours before

Local storm report, Jul 10, 11:54 PM EDT, 4 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE, PA
1154 PM EDT TUE JUL 10 2001

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0228 PM    POTTSVILLE                PA   WIND DAMAGE
07/10/01   SCHUYLKILL                     TREES AND POWER
                                          LINES BLOWN DOWN

0230 PM    12 N HUNTINGDON           PA   1.75 INCH HAIL
07/10/01   HUNTINGDON

0239 PM    2 N CAMP HILL             PA   0.88 INCH HAIL
07/10/01   CUMBERLAND

0301 PM    CORNWALL                  PA   WIND DAMAGE
07/10/01   LEBANON                        TREES AND POWER
                                          LINES DOWN

0307 PM    HARRISBURG                PA   WIND DAMAGE
07/10/01   DAUPHIN                        NUMEROUS TREES
                                          AND POWER LINES
                                          KNOCKED DOWN

0310 PM    2 NE YORK                 PA   WIND DAMAGE
07/10/01   YORK                           TREES DOWN
                                          BLOCKING ROADS

0349 PM    JOHNSTOWN                 PA   WIND DAMAGE
07/10/01   CAMBRIA                        NUMEROUS TREES
                                          BLOWN DOWN

Special weather statement, Jul 11, 4:00 AM EDT, 8 minutes before

PAZ012-017>019-024>028-033>037-041-042-045-046-049>053-056>059-
063>066-111300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
400 AM EDT WED JUL 11 2001

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 900 AM EDT FOR
MOST OF CENTRAL PENNSYLVANIA...INCLUDING THE FOLLOWING COUNTIES...

ADAMS...BEDFORD...BLAIR...CAMBRIA...CENTRE...CLEARFIELD...CLINTON
...COLUMBIA...CUMBERLAND...DAUPHIN...FRANKLIN...FULTON...HUNTINGDON
...JUNIATA...LANCASTER...LEBANON...LYCOMING...MIFFLIN...MONTOUR
...NORTHUMBERLAND...PERRY...SCHUYLKILL...SNYDER...SOMERSET...SULLIVAN
...TIOGA...UNION...AND YORK.

A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR
SEVERE THUNDERSTORMS TO OCCUR. WINDS IN EXCESS OF 60 MPH AND HAIL
LARGER THAN THREE QUARTERS OF AN INCH IN DIAMETER ARE POSSIBLE IN
AND NEAR THE WATCH AREA.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES).

ROGOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 8:09 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	51 min
Jul 10, 11:48 PM EDT	Severe Thunderstorm Warning	CTP	McKean	57 min
Jul 11, 12:24 AM EDT	Severe Thunderstorm Warning	CTP	Cameron	51 min
Jul 11, 2:15 AM EDT	Severe Thunderstorm Warning	CTP	Elk	45 min
Jul 11, 2:59 AM EDT	Tornado Warning	CTP	Clearfield, Elk	31 min
Jul 11, 3:36 AM EDT	Severe Thunderstorm Warning	CTP	Centre	54 min
Jul 11, 3:45 AM EDT	Severe Thunderstorm Warning	CTP	Lycoming	45 min
Jul 11, 4:08 AM EDT	Severe Thunderstorm Warning	CTP	Union	67 min
Jul 11, 5:00 AM EDT	Tornado Warning	CTP	Snyder, Union	30 min
Jul 11, 5:22 AM EDT	Tornado Warning	CTP	Northumberland	23 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2001 Every severe thunderstorm warning in 2001

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.