Alert archive / Pennsylvania / Tornado Warnings in 1999

Tornado Warning 8, NWS State College, PA

August 13, 1999Cambria County, Pennsylvania

NWS State College, PA issued this tornado warning at Aug 13, 1999, 4:56 PM EDT for Cambria County, Pennsylvania. It was in force for 34 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued
Aug 13, 1999, 4:56 PM EDT (20:56 UTC)
Expired
Aug 13, 1999, 5:30 PM EDT
In force
34 min
Issued by
NWS State College, PA
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Cambria County, PA

What was reported inside it

TimeReportWhereRemark
Aug 13, 5:05 PM EDTThunderstorm WindPatton, PADownburst winds struck Prince Gallitzin State Park on late afternoon of Friday the 13th, crossing the heart of the campground area in the park. Hundreds of trees were blown down by the strong winds, damaging trucks, cars, tents, and campers. A 20-year old ma
Aug 13, 5:10 PM EDTThunderstorm WindSpangler, PATrees were downed.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 8.9 hours before the alert went out and 125 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 1999-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 1999-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1633 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
126 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.

000 
TTAA00 KCTP 132100 RRA
TORCTP
PAC021-132130-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
456 PM EDT FRI AUG 13 1999

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN CAMBRIA COUNTY.

* UNTIL 530 PM EDT.

* AT 447 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A DEVELOPING TORNADO OVER SPANGLER...OR ABOUT 11
  MILES NORTH OF EBENSBURG...M&OVING EAST AT 25 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CHEST SPRINGS...PATTON AT 505 PM EDT.

GO TO A BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR.

.END/ GRUMM

LAT...LON 4069 7882 4055 7879 4058 7845 4075 7840

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Aug 13, 3:25 PM EDT, 1 hour 31 minutes earlier.

Area forecast discussion, Aug 13, 3:25 PM EDT, 1 hour 31 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
325 PM EDT FRI AUG 13 1999

LINES OF SCATTERED TSRA NOW FORMING BACK IN W PA AND OHIO. WILL
PROBABLY SEE SOME ACTIVITY FIRE AND COME INTO WEST PA THIS EVENING
THEN WEAKEN BEFORE REACHING CENTRAL PA. MOST MODELS INITIALIZED TOO
WET...BUT LAST FEW RUNS OF MM5 HAVE BEEN CLOSER TO REALITY. WILL
LOWER POPS FOR TONIGHT TO CHC AND WORD AS MAINLY EVENING
THUNDERSTORMS.

SATURDAY WILL FEATURE MORE WIDESPREAD PRECIP AS SW TROF AXIS AND
VORT MOVE THRU...WITH MODEL SOUNDINGS INDICATING PLENTY OF DEEP
MOISTURE AND INSTABILTY TO BE TAPPED. WIND PROFILES ALSO SUGGEST SVR
POTENTIAL. WILL HAVE LIKELY POPS ALL ZONES. HEAVY RAIN AND POTENTIAL
FOR SVR WILL MAKE FOR AN INTERESTING DAY.

MOST SIG PRECIP SHUD BE EAST OF CTP CWA BY SAT EVE...WITH SHRA
LINGERING THRU OVERNIGHT PERIOD IN EAST ZONES. THINGS DRY OUT FOR
SUN...WITH MODERATING TEMPS INTO MIDWEEK.

.CTP...NONE.

OSTUNO/ SCALIO

In the hours before

Special weather statement, Aug 13, 11:53 AM EDT, 5 hours 3 minutes before
PAZ004>006-010>012-017>019-024-025-033-037-041-045-046-132200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1153 AM EDT FRI AUG 13 1999

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
CENTRAL PENNSYLVANIA THIS AFTERNOON AND EVENING...

A COLD FRONT APPROACHING THE REGION FROM THE MIDWEST WILL TRIGGER
SHOWERS AND THUNDERSTORMS. THE SHOWERS AND THUNDERSTORMS ARE EXPECTED
TO AFFECT CENTRAL PENNSYLVANIA THIS AFTERNOON AND EVENING.

SOME OF THE THUNDERSTORMS MAY BECOME LOCALLY SEVERE...CAUSING
DAMAGING WINDS AND LARGE HAIL.

SKYWARN ACTIVATION MAY BE NECESSARY THIS AFTERNOON.

STAY TUNED TO NOAA WEATHER RADIO...THE OFFICIAL VOICE OF THE
NATIONAL WEATHER SERVICE...OR YOUR FAVORITE TV OR RADIO STATION...
FOR THE LATEST FORECASTS AND STATEMENTS.

.END/ OSTUNO/ SCALIO

ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE
WEBSITE AT:  HTTP://BOOKEND.MET.PSU.EDU  (ALL LOWER CASE)
Special weather statement, Aug 13, 11:53 AM EDT, 5 hours 3 minutes before
PAZ004>006-010>012-017>019-024-025-033-037-041-045-046-132200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1153 AM EDT FRI AUG 13 1999

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
CENTRAL PENNSYLVANIA THIS AFTERNOON AND EVENING...

A COLD FRONT APPROACHING THE REGION FROM THE MIDWEST WILL TRIGGER
SHOWERS AND THUNDERSTORMS. THE SHOWERS AND THUNDERSTORMS ARE EXPECTED
TO AFFECT CENTRAL PENNSYLVANIA THIS AFTERNOON AND EVENING.

SOME OF THE THUNDERSTORMS MAY BECOME LOCALLY SEVERE...CAUSING
DAMAGING WINDS AND LARGE HAIL.

SKYWARN ACTIVATION MAY BE NECESSARY THIS AFTERNOON.

STAY TUNED TO NOAA WEATHER RADIO...THE OFFICIAL VOICE OF THE
NATIONAL WEATHER SERVICE...OR YOUR FAVORITE TV OR RADIO STATION...
FOR THE LATEST FORECASTS AND STATEMENTS.

.END/ OSTUNO/ SCALIO

ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE
WEBSITE AT:  HTTP://BOOKEND.MET.PSU.EDU  (ALL LOWER CASE)

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 4:22 PM EDTSevere Thunderstorm WarningCTPClearfield53 min
Aug 13, 4:26 PM EDTSevere Thunderstorm WarningCTPCambria64 min
Aug 13, 4:34 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton86 min
Aug 13, 4:55 PM EDTSevere Thunderstorm WarningCTPBlair65 min
Aug 13, 5:18 PM EDTSevere Thunderstorm WarningCTPHuntingdon57 min
Aug 13, 5:39 PM EDTSevere Thunderstorm WarningCTPLycoming, Union66 min

Nearby

Tornado Warnings in Pennsylvania, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.