Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 21, NWS State College, PA

June 9, 1993York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 9, 1993, 7:25 PM EDT for York County, Pennsylvania. It was in force for 50 min.

The area

The counties it named.

The facts

Issued
Jun 9, 1993, 7:25 PM EDT (23:25 UTC)
Expired
Jun 9, 1993, 8:15 PM EDT
In force
50 min
Issued by
NWS State College, PA
Area
Whole counties

County York County, PA

The radar

The Sterling radar (KLWX), 124 km from the middle of the area, began a volume at 23:24 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 122 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, Washington/Dulle, VA at 12:00Z on 1993-06-09Temperature 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, Washington/Dulle, VA at 12:00Z on 1993-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
1621 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
68 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 KHAR 092324 RRA
SVRHAR
PAC133-100015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HARRISBURG PA
725 PM EDT WED JUN 9 1993
 
THE NATIONAL WEATHER SERVICE IN HARRISBURG HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  815 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTH CENTRAL PENNSYLVANIA
 
   ...SOUTHERN YORK COUNTY
 
AT 725 WEATHER SERVICE RADAR IN HARRISBURG SHOWED A POSSIBLE SEVERE
THUNDERSTORM IN SOUTHERN YORK COUNTY NEAR STEWARTSTOWN. THE STORM IS
MOVING SOUTHEAST AT 30 MILES AN HOUR.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNnING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
FENNER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 8, 10:39 PM EDTSevere Thunderstorm WarningCTPHuntingdon66 min
Jun 9, 12:35 AM EDTSevere Thunderstorm WarningCTPYork25 min
Jun 9, 12:19 PM EDTSevere Thunderstorm WarningCTPClinton26 min
Jun 9, 12:38 PM EDTSevere Thunderstorm WarningCTPBradford67 min
Jun 9, 3:15 PM EDTSevere Thunderstorm WarningCTPNorthampton
Jun 9, 3:58 PM EDTSevere Thunderstorm WarningCTPYork47 min
Jun 9, 4:36 PM EDTSevere Thunderstorm WarningCTPLancaster54 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1993Every severe thunderstorm warning in 1993

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.