Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 49, NWS State College, PA

June 2, 1999Cumberland County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 2, 1999, 5:14 PM EDT for Cumberland County, Pennsylvania. It was in force for 61 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
Jun 2, 1999, 5:14 PM EDT (21:14 UTC)
Expired
Jun 2, 1999, 6:15 PM EDT
In force
61 min
Issued by
NWS State College, PA
Area
Whole counties

County Cumberland County, PA

The radar

The State College radar (KCCX), 105 km from the middle of the area, began a volume at 21:15 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 126 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 1999-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 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 1999-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.1939Sfc1 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
1863 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
34 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 022114 RRA
SVRCTP
PAC035-041-055-067-087-099-022215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
514 PM EDT WED JUN 2 1999

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FRANKLIN COUNTY.
  CLINTON COUNTY.
  MIFFLIN COUNTY.
  JUNIATA COUNTY.
  CUMBERLAND COUNTY.
  PERRY COUNTY.

* UNTIL 615 PM EDT.

* AT 505 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM ALONG A LINE EXTENDING FROM BELLEFONTE TO 
  MOUNT UNION TO FORT LOUDON...MOVING EAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  RENOVO...SOUTH RENOVO AT 520 PM EDT.   
  LEWISTOWN AT 525 PM EDT.   
  BURNHAM AND MILROY AT 530 PM EDT.
  BEECH CREEK AT 535 PM EDT.
  CHAMBERSBURG AT 545 PM EDT.

HAIL...INTENSE RAIN AND STRONG DAMAGING WINDS ARE LIKELY WITH THIS
STORM. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM PASSES.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SOV DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

.END/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 Jun 2, 2:57 PM EDT, 2 hours 17 minutes earlier.

Area forecast discussion, Jun 2, 2:57 PM EDT, 2 hours 17 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
250 PM EDT WED JUNE 2 1999

INTERESTING SITUATION CONTINUING TO EVOLVE FOR LATE THIS AFTERNOON
TONIGHT OVER THE REGION. AN UPPER LOW SPINNING OVER MICHIGAN WILL
SLOWLY WEAKEN WITH TIME AND LIFT ENE ACROSS ONTARIO/QUEBEC AND
NORTHERN NY STATE. VERY JUICY AIR IN PLACE OVER PA (SURFACE
DEWPOINTS >60F) WITH MOIST SOUTHWESTERLY JET FUELING CONVECTIVE
ACTIVITY THIS AFTERNOON.

AT PRESS TIME...ONE LINE OF STRONG/SEVERE TSRA MOVING THROUGH THE
SUSQUEHANNA VALLEY. ANOTHER AREA OF SHRA/TSRA IN WESTERN PA...WITH A
THIRD LINE TRYING TO ORGANIZE ALONG THE ACTUAL COLD FRONT IN CENTRAL
OHIO. THE BIG QUESTION IS - HOW MUCH CONVECTIVE/SEVERE ACTIVITY WILL
AFFECT CENTRAL PA BEFORE THE FRONT PASSES ACROSS LATE TONIGHT?

WILL CARRY LIKELY POPS ALL COUNTIES TONIGHT. EXPECT A COUPLE OF
BROKEN LINES OF SHOWERS AND THUNDERSTORMS TO AFFECT CENTRAL PA THIS
AFTERNOON AND EVENING. DAYTIME HEATING HAS DESTABILIZED THE AIR...
BUT THE BEST DYNAMICS DO NOT REACH THE AREA UNTIL AFTER SUNSET. THUS...
ISOLATED SEVERE WEATHER WILL CONTINUE THIS AFTERNOON AND LINGER INTO
THE EVENING BEFORE THE ACTIVITY WEAKENS TO SHOWERS.

A SHORTWAVE ASSOCIATED WITH A JET STREAK WILL PUSH IN FROM THE
NORTHWEST EARLY THURSDAY...AND BUMP THE FRONT EAST AWAY FROM PA.
THERE WILL BE A CHANCE OF INSTABILITY SHOWERS EARLY IN THE DAY...BUT
BY AFTERNOON DRIER AIR WILL TAKE OVER AND CLOUDS WILL DECREASE.

COOLER THURSDAY NIGHT AND FRIDAY AS HIGH PRESSURE BUILDS IN. WEEKEND
LOOKS DRY AS TEMPS AGAIN CREEP UPWARD.

.CTP...NONE.

RXR

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 2, 12:43 PM EDTSevere Thunderstorm WarningCTPHuntingdon, Mifflin62 min
Jun 2, 2:41 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, York49 min
Jun 2, 2:41 PM EDTSevere Thunderstorm WarningCTPCumberland49 min
Jun 2, 2:48 PM EDTSevere Thunderstorm WarningCTPSomerset42 min
Jun 2, 3:13 PM EDTSevere Thunderstorm WarningCTPCambria62 min
Jun 2, 3:25 PM EDTSevere Thunderstorm WarningCTPLancaster, Lebanon, Schuylkill50 min
Jun 2, 3:25 PM EDTSevere Thunderstorm WarningCTPYork50 min
Jun 2, 4:07 PM EDTSevere Thunderstorm WarningCTPBedford, Blair53 min
Jun 2, 4:20 PM EDTSevere Thunderstorm WarningCTPCentre55 min
Jun 2, 4:32 PM EDTSevere Thunderstorm WarningCTPFulton, Huntingdon58 min
Jun 2, 4:34 PM EDTSevere Thunderstorm WarningCTPClearfield41 min
Jun 2, 5:14 PM EDTSevere Thunderstorm WarningCTPFranklin, Juniata, Mifflin, Perry61 min
Jun 2, 5:14 PM EDTSevere Thunderstorm WarningCTPClinton61 min
Jun 2, 5:27 PM EDTSevere Thunderstorm WarningCTPLycoming, Union78 min
Jun 2, 5:27 PM EDTSevere Thunderstorm WarningCTPCentre78 min
Jun 2, 5:27 PM EDTSevere Thunderstorm WarningCTPSnyder78 min
Jun 2, 5:47 PM EDTSevere Thunderstorm WarningCTPTioga73 min
Jun 2, 5:55 PM EDTSevere Thunderstorm WarningCTPAdams, Franklin65 min
Jun 2, 7:15 PM EDTSevere Thunderstorm WarningCTPAdams, York60 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1999Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.