Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 28, NWS State College, PA

May 6, 1998Lancaster County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at May 6, 1998, 3:06 PM EDT for Lancaster County, Pennsylvania. It was in force for 64 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
May 6, 1998, 3:06 PM EDT (19:06 UTC)
Expired
May 6, 1998, 4:10 PM EDT
In force
64 min
Issued by
NWS State College, PA
Area
Whole counties

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 152 km from the middle of the area, began a volume at 19:09 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.

What was reported inside it

TimeReportWhereRemark
May 6, 3:12 PM EDTHail 0.8Millersville, PANickel size hail fell in Millersville and just north of Lancaster. Pea size hail covered the ground in Lancaster.

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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.1 hours before the alert went out and 65 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, Phillips Aaf/Abe, MD at 12:00Z on 1998-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 230 joules per kilogram.LCLLFCEL10008507005003002001001 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, Phillips Aaf/Abe, MD at 12:00Z on 1998-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
230 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
463 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

675 
WUUS01 KCTP 061908 RRA
SVRCTP
PAC071-062010-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
306 PM EDT WED MAY 6 1998

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LANCASTER COUNTY IN SOUTHEASTERN PENNSYLVANIA

* UNTIL 410 PM EDT

* AT 303PP...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR MILLERSVILLE... MOVING EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LANCASTER 310 PM

THIS STORM HAS A HISTORY OF LARGE HAIL. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.  NICKEL SIZE HAIL WAS REPORTED
IN MILLERSVILLE AT 304 PM.

TED

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE INDOORS AND STAY AWAY FROM WINDOWS.  HEAVY RAINS
FLOOD
ROADS QUICKLY.  DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&

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 6, 10:10 AM EDT, 4 hours 56 minutes earlier.

Area forecast discussion, May 6, 10:10 AM EDT, 4 hours 56 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1010 AM EDT WED MAY 6 1998

...WORKZONES SENT TO NWSFO/S PIT AND PHL VIA PHLADMCTP...

...DISCUSSION...
UPPER LOW CONTINUES TO SPIN SLOWLY TO THE EAST ACROSS CNTRL MD THIS
MORNING. THIS IS SIGNIFICANTLY SLOWER THAN WHAT THE MODELS WERE
TIMING A COUPLE OF DAYS AGO. AS A RESULT...THERE WILL STILL BE A FEW
SCT RW/TRW ACROSS CENTRAL PA THIS AFTERNOON. SAT LOOPS SHOW LARGE
BREAKS IN THE CLOUDS OVER NE AND SW PA...WITH THICKEST CLOUD COVER
OVER THE CNTRL MTNS. WITH BREAKS IN MOST PLACES TODAY LAPSE RATES
WILL ONCE AGAIN STEEPEN. MODEL KS ONCE AGAIN ARE IN THE MID 20S...
WITH FORECAST LIS JUST BELOW ZERO AND MID-LVL LAPSE RATES OVER 6
DEG C/KM. ONE MIGHT EXPECT THE BEST CHC OF RAIN TO OVER EASTERN PA
TODAY...BUT THE MESO ETA IS SHOWING BEST LOW-LVL CONVERGENCE OVER
THE LAURELS...WHERE HEAVIEST RAINS HAVE FALLEN THE PAST FEW DAYS.
DIFFERENCE TODAY WILL BE LACK OF DEEP SSE FLOW FOR TRAINING AND
UPSLOPE...SO DONT EXPECT FLOODING.

NEXT SYSTEM APPROACHING THURSDAY AFTERNOON WILL ONCE AGAIN TURN THE
FLOW TO SSE WITH GULF OPENING UP...LIS FALLING BELOW ZERO...AND
PWATS RISING ABOVE AN INCH. BASED ON RECENT HEAVY RAINS...WILL
CONSIDER ISSUING AN ESF (OUTLOOK) FOR THE POTENTIAL FOR HEAVY RAINS
WITH THIS AFTERNOONS PACKAGE.

MSE

The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 8:21 PM EDTFlash Flood WarningCTPBedford6 hr
May 5, 10:13 PM EDTFlash Flood WarningCTPCambria, Somerset4 hr
May 6, 3:02 PM EDTSevere Thunderstorm WarningCTPLancaster63 min
May 6, 4:15 PM EDTFlash Flood WarningCTPLancaster3 hr

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; radar from the NEXRAD Level II archive.