Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 192, NWS State College, PA

August 25, 1998Clinton County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 25, 1998, 10:09 PM EDT for Clinton County, Pennsylvania. It was in force for 21 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: Aug 25, 1998, 10:09 PM EDT (02:09 UTC)
Expired: Aug 25, 1998, 10:30 PM EDT
In force: 21 min
Issued by: NWS State College, PA
Area: Whole counties

County Clinton County, PA

The radar

The State College radar (KCCX), 46 km from the middle of the area, began a volume at 02:09 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

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 2.2 hours before the alert went out and 208 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: 691 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 829 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

317 
WUUS01 KCTP 260210 RRA
SVRCTP
PAC035-260230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1009 PM EDT TUE AUG 25 1998

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLINTON COUNTY IN CENTRAL PENNSYLVANIA

* UNTIL 1030 PM EDT

* AT 1008 PM EDT...STATE COLLEGE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 8 MILES SOUTH OF JERSEY SHORE OR IN THE VICINITY OF
  RAVENSBURG STATE PARK...MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RAVENSBURG STATE PARK AT 1008 PM EDT
  CARROLL AT 1010 PM EDT

THIS IS A DANGEROUS STORM STAY INDOORS AWAY FROM WINDOWS.

WINTHER

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 Aug 25, 9:25 PM EDT, 44 minutes earlier.

Area forecast discussion, Aug 25, 9:25 PM EDT, 44 minutes before

CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
925 PM EDT TUE AUG 25 1998

...WORK ZONES SENT TO KPHI AND KPBZ...

THANKS BGM (RAY) FOR THE COORDINATION CALL CONCERNING DVLPG
CONVECTION OVER CENT PA THIS EVENING

PRECIP ALONG PRE FRONTAL SQUALL LINE HAS PUSHED SOUTH OF THE LAURELS
WITH OTHER...WEAKER SHRA READY TO EXIT EAST OF THE YORK/LANCASTER
AREA.

ANOTHER SMALL CLUSTER OF TSRA HAS RECENTLY DEVELOPED JUST TO THE
WEST OF THE KCCX RADAR SITE...WITH MVMT 250 DEG AT 40 KT.

ETA AND 21Z RUC MODEL SHOWS MID/UPR LEVEL VORT LOBE IN RESPONSE TO
JET STREAK MOVING FROM WRN PA AT 00Z TO THE NERN CORNER OF THE STATE
AROUND 09Z.

RUC PICKS UP ON THIS FEATURE BEST...BUT AREAL QPF COVERAGE APPEARS
WAY OVERDONE. STILL A 15-MINUTE DOWNPOUR WITH SOME BRIEF WIND GUSTS
TO 40 MPH COULD OCCUR TIL ABOUT MIDNIGHT BETWEEN KCTP AND KIPT...AND
TIL AROUND 05-06Z ACROSS THE MTNS NE OF IPT.

COUNTY WIDE COVERAGE OF THE SHRA/TSRA OVER CENT PA IS NOT ALL THAT
GREAT...SO WILL GO WITH ZONE WORDING AS SCTD EARLY TONIGHT...AND
LEAVE THE SPECIFICS CONCERNING TIMING/LOCATION UP TO THE NOWCASTS.

OTHERWISE...GRADUAL CLEARING WILL TAKE PLACE DURING THE PREDAWN
HOURS ACROSS THE WEST AS THE SFC COLD CURRENTLY POISED FROM NEAR
KYYZ TO KCLE MOVES TO CENT PA AT 12Z.

NO CHANGES TO LATER PERIODS OF FCST. SCATTERED/LIKELY POPS FOR
SHRAS ACROSS THE ECENT PART OF PENN FOR WEDNESDAY NIGHT AND
THURSDAY STILL APPEAR ON TRACK. LATEST SAT ANIMATION OF HURRICANE
BONNIE KEEPS THE STORM ON A TRACK OF 315 DEG AT AROUND 11 KT.
THE CURRENT CENTER IS APPROX 100 NM SSW OF ETAS FCST LOCATION WITH
A MVMT SLIGHTLY MORE TO THE WEST THAN MODEL PROJECTIONS.

THIS MAY MEAN A READJUSTMENT TO THE PRECIP FURTHER WEST INTO CENTRAL
PA WEDNESDAY NIGHT...AND LINGERING IT THROUGH THURSDAY MORNING.

.CTP...NONE.

LAMBERT

In the hours before

Local storm report, Aug 25, 9:59 PM EDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PENNSYLVANIA
959 PM EDT TUE AUG 25 1998

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

1022 AM    DU BOIS                   PA   WIND DAMAGE
08/24/98   CLEARFIELD                     SEVERAL TREES BLOWN DOWN
                                          ALONG INTERSTATE 80...2 MI
                                          NE DU BOIS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 8:47 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	33 min
Aug 25, 10:12 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming	63 min
Aug 25, 10:47 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Sullivan	43 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1998 Every severe thunderstorm warning in 1998

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.