Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 161, NWS State College, PA

July 17, 1998Centre County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 17, 1998, 5:55 PM EDT for Centre County, Pennsylvania. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 17, 1998, 5:55 PM EDT (21:55 UTC)
Expired
Jul 17, 1998, 6:55 PM EDT
In force
60 min
Issued by
NWS State College, PA
Area
Whole counties

County Centre County, PA

What was reported inside it

TimeReportWhereRemark
Jul 17, 6:05 PM EDTThunderstorm Wind 51Julian, PAWinds blew a utility pole over, damaging a house.

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, 9.9 hours before the alert went out and 200 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 1998-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1104 joules per kilogram.LCLEL10008507005003002001001 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 1998-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
1104 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
520 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
29 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.

270 
WUUS01 KCTP 172153 RRA
SVRCTP
PAC027-172255-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
555 PM EDT FRI JUL 17 1998

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A

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

* UNTIL 655 PM EDT

* AT 553 PM EDT...STATE COLLEGE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 5 MILES NORTHWEST OF BELLEFONTE OR 4 MILES WEST OF
  MILESBURG...MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILESBURG AT 605 PM EDT
  BELLEFONTE AT 610 PM EDT
  PLEASANT GAP AT 615 PM EDT
  BALD EAGLE STATE PARK AT 620 PM EDT
  HOWARD AT 620 PM EDT
  PENNS CAVE AT 625 PM EDT
  CENTRE HALL AT 630 PM EDT
  POTTERS MILLS AT 640 PM EDT

THIS IS A DANGEROUS STORM STAY INDOORS AWAY FROM WINDOWS.

KF/PJ

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 17, 2:07 PM EDT, 3 hours 48 minutes earlier.

Area forecast discussion, Jul 17, 2:07 PM EDT, 3 hours 48 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
207 PM EDT FRI JUL 17 1998

...ZONES TO BE SENT TO PIT/PHL VIA ADMCTP BY 230 PM...

...DISCUSSION...

MAIN FCST PROBLM...HOW TO DEAL W/PCPN TONIGHT.

SCT TSRA POPPING ATTM ACRS CENT MTNS. STRMS FEEDING ON UPR 60S AND
LWR 70S DWPTS...AND GOOD DRY AIR INTRUSION AT MID LVLS. SPEED
MAX/JET STREAK EVIDENT ON WV LOOP FM SW TO NE DIRECTLY OVR CENT PA
ATTM...AS FNT ANALYZED EARLIER ON SFC ANALYSIS IN OH/WRN PA HAS
MOVD E. FNT SHWS UP BEST IN SFC WND FIELD.

SFC DRY AIR OVR CENT OH EARLIER HAS NOT YET MADE IT INTO WRN PA. WV
ALSO DEPICTS STRONG VORT MAX OVR GRT LKS MOVG ESE INTO SRN ONT.
ALL PROGGED TO PUSH ACRS PA THIS AFT/EVE. GETTING PETTY ON THE
TIMING MAY NOT BE EASY...SO WL PROB LEAVE TIMING OUT IN NRN ZNS.
SRN ZNS WL LIKELY HAVE DISTINCT END...AS GRT LKS S/W ENERGY STAYS TO
N OF THOSE CTYS.

LIKED ETA SOLN BETTER TDY...AS BIG THREE MODELS INITIALIZED
SIMILARLY. BUT...NGM PUMPS OUT PCPN DURING THE DAY SAT OVR WRN PA.
ETA POOLS THTE ARND BWI/LWR SUSQ IN ERLY PDS. THIS SEEMS VERY LIKELY
AS FNT DRAGS E/W LATER TNGHT S OF MASON/DIXON LN.

COOLER...BUT NOT MUCH...ON SAT AND HUMIDITIES MUCH LWR. TRAJECTORIES
FOR SAT COMING DOWN FM LK SUP/E WISCONSIN  LCL CU RULE INDICATES
VERY STABLE LWR LYRS ON SAT OVER FA W/SCT CU AT BEST. MO SUNNY WRDNG
BEST. TEMPS W/SS WILL RISE WELL. MDL SNDG FOR UNV GIVES MAX IN LWR
80S (HIER THAN FWC). SAME DEAL FOR IPT GIVES BARELY COOLER VALUES
THAN DO FWC/FAN THO. WL LIKELY GO W/FAN AS STRONG JULY SS FACTORS
BIG. POPS UNLIKELY IN LAST THREE PDS...BUT LIKELY TO NEARLY CAT IN
FIRST PD.

AGREE W/PITS SFD COMMENT ON LEAVING OUT POPS FOR SUNDAY ATTM...BUT
MOIST RETURN FLOW IS RAPID. THIS DRY SHOT WILL BE SHORT-LIVED.

.CTP...NONE

DANGELO

In the hours before

Local storm report, Jul 17, 5:27 PM EDT, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PENNSYLVANIA
527 PM EDT FRI JUL 17 1998

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

0440 PM    CATAWISSA                 PA   WIND DAMAGE
07/17/98   COLUMBIA                       TREES DOWN.

0440 PM    MAINVILLE                 PA   WIND DAMAGE
07/17/98   COLUMBIA                       TREES DOWN.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 4:15 PM EDTSevere Thunderstorm WarningCTPColumbia35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1998Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.