Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 45, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jun 2, 1999, 4:20 PM EDT for Centre County, Pennsylvania. It was in force for 55 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
- Jun 2, 1999, 4:20 PM EDT (20:20 UTC)
- Expired
- Jun 2, 1999, 5:15 PM EDT
- In force
- 55 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
County Centre County, PA
The radar
The State College radar (KCCX), 15 km from the middle of the area, began a volume at 20:19 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 2, 4:50 PM EDT | Thunderstorm Wind | Port Matilda, PA | Trees down in Port Matilda and Bellefonte. |
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, 8.3 hours before the alert went out and 217 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.
- 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
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 1 hour 23 minutes earlier.
Area forecast discussion, Jun 2, 2:57 PM EDT, 1 hour 23 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
In the hours before
Special weather statement, Jun 2, 10:45 AM EDT, 5 hours 35 minutes before
PAZ004>006-010>012-017>019-024>026-033-034-037-041-042-045-046- 022200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 1045 AM EDT WED JUN 2 1999 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE NORTHWEST MOUNTAINS OF PENNSYLVANIA THIS AFTERNOON AND EVENING... THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING OVER MOST OF WESTERN PENNSYLVANIA...TO INCLUDE THE NORTHWEST MOUNTAINS OF THE STATE. THE SLIGHT RISK AREA IS MAINLY WEST OF A BRADFORD TO RIDGWAY LINE IN NORTHWEST PENNSYLVANIA. LOW PRESSURE CENTERED LOWER MICHIGAN LATE THIS MORNING WILL TRACK NORTHEAST...TO SOUTHERN QUEBEC BY LATE THIS EVENING. WARM AND HUMID AIR WILL FLOW NORTH...AHEAD OF THIS SYSTEM INTO WESTERN PENNSYLVANIA...AND SET THE STAGE FOR THUNDERSTORM DEVELOPMENT. THE THUNDERSTORMS WILL BECOME MORE NUMEROUS AS THE AFTERNOON PROGRESSES...PEAKING IN THE EVENING. IN THE SLIGHT RISK AREA...THE PRIMARY THREAT FROM ANY THUNDERSTORM THAT FORMS WILL BE STRONG... DAMAGING WINDS IN EXCESS OF 58 MPH. JUST TO THE EAST OF THE SLIGHT RISK AREA FROM THE NORTH CENTRAL MOUNTAINS...SOUTHWEST TO THE LAUREL HIGHLANDS...A FEW STORMS COULD BECOME STRONG...WITH WIND GUSTS TO 50 MPH POSSIBLE. STORMS WILL AFFECT THESE AREAS MAINLY FROM MID AFTERNOON THROUGH THE EVENING HOURS. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS CONCERNING THE POSSIBILITY OF SEVERE WEATHER THIS AFTERNOON OR EVENING IN WESTERN PENNSYLVANIA. SKYWARN ACTIVATION MAY BE NEEDED LATER TODAY. .END/NICOSIA
Special weather statement, Jun 2, 10:45 AM EDT, 5 hours 35 minutes before
PAZ004>006-010>012-017>019-024>026-033-034-037-041-042-045-046- 022200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA...CORRECTED 1045 AM EDT WED JUN 2 1999 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE NORTHWEST MOUNTAINS OF PENNSYLVANIA THIS AFTERNOON AND EVENING... THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING OVER MOST OF WESTERN PENNSYLVANIA...TO INCLUDE THE NORTHWEST MOUNTAINS OF THE STATE. THE SLIGHT RISK AREA IS MAINLY WEST OF A BRADFORD TO RIDGWAY LINE IN NORTHWEST PENNSYLVANIA. LOW PRESSURE CENTERED OVER LOWER MICHIGAN LATE THIS MORNING WILL TRACK NORTHEAST...TO SOUTHERN QUEBEC BY LATE THIS EVENING. WARM AND HUMID AIR WILL FLOW NORTH...AHEAD OF THIS SYSTEM INTO WESTERN PENNSYLVANIA...AND SET THE STAGE FOR THUNDERSTORM DEVELOPMENT. THE THUNDERSTORMS WILL BECOME MORE NUMEROUS AS THE AFTERNOON PROGRESSES...PEAKING IN THE EVENING. IN THE SLIGHT RISK AREA...THE PRIMARY THREAT FROM ANY THUNDERSTORM THAT FORMS WILL BE STRONG... DAMAGING WINDS IN EXCESS OF 58 MPH. JUST TO THE EAST OF THE SLIGHT RISK AREA FROM THE NORTH CENTRAL MOUNTAINS...SOUTHWEST TO THE LAUREL HIGHLANDS...A FEW STORMS COULD BECOME STRONG...WITH WIND GUSTS TO 50 MPH POSSIBLE. STORMS WILL AFFECT THESE AREAS MAINLY FROM MID AFTERNOON THROUGH THE EVENING HOURS. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS CONCERNING THE POSSIBILITY OF SEVERE WEATHER THIS AFTERNOON OR EVENING IN WESTERN PENNSYLVANIA. SKYWARN ACTIVATION MAY BE NEEDED LATER TODAY. .END/NICOSIA
Special weather statement, Jun 2, 10:45 AM EDT, 5 hours 35 minutes before
PAZ004>006-010>012-017>019-024>026-033-034-037-041-042-045-046- 022200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 1045 AM EDT WED JUN 2 1999 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE NORTHWEST MOUNTAINS OF PENNSYLVANIA THIS AFTERNOON AND EVENING... THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING OVER MOST OF WESTERN PENNSYLVANIA...TO INCLUDE THE NORTHWEST MOUNTAINS OF THE STATE. THE SLIGHT RISK AREA IS MAINLY WEST OF A BRADFORD TO RIDGWAY LINE IN NORTHWEST PENNSYLVANIA. LOW PRESSURE CENTERED LOWER MICHIGAN LATE THIS MORNING WILL TRACK NORTHEAST...TO SOUTHERN QUEBEC BY LATE THIS EVENING. WARM AND HUMID AIR WILL FLOW NORTH...AHEAD OF THIS SYSTEM INTO WESTERN PENNSYLVANIA...AND SET THE STAGE FOR THUNDERSTORM DEVELOPMENT. THE THUNDERSTORMS WILL BECOME MORE NUMEROUS AS THE AFTERNOON PROGRESSES...PEAKING IN THE EVENING. IN THE SLIGHT RISK AREA...THE PRIMARY THREAT FROM ANY THUNDERSTORM THAT FORMS WILL BE STRONG... DAMAGING WINDS IN EXCESS OF 58 MPH. JUST TO THE EAST OF THE SLIGHT RISK AREA FROM THE NORTH CENTRAL MOUNTAINS...SOUTHWEST TO THE LAUREL HIGHLANDS...A FEW STORMS COULD BECOME STRONG...WITH WIND GUSTS TO 50 MPH POSSIBLE. STORMS WILL AFFECT THESE AREAS MAINLY FROM MID AFTERNOON THROUGH THE EVENING HOURS. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS CONCERNING THE POSSIBILITY OF SEVERE WEATHER THIS AFTERNOON OR EVENING IN WESTERN PENNSYLVANIA. SKYWARN ACTIVATION MAY BE NEEDED LATER TODAY. .END/NICOSIA
Special weather statement, Jun 2, 10:45 AM EDT, 5 hours 35 minutes before
PAZ004>006-010>012-017>019-024>026-033-034-037-041-042-045-046- 022200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA...CORRECTED 1045 AM EDT WED JUN 2 1999 ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE NORTHWEST MOUNTAINS OF PENNSYLVANIA THIS AFTERNOON AND EVENING... THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING OVER MOST OF WESTERN PENNSYLVANIA...TO INCLUDE THE NORTHWEST MOUNTAINS OF THE STATE. THE SLIGHT RISK AREA IS MAINLY WEST OF A BRADFORD TO RIDGWAY LINE IN NORTHWEST PENNSYLVANIA. LOW PRESSURE CENTERED OVER LOWER MICHIGAN LATE THIS MORNING WILL TRACK NORTHEAST...TO SOUTHERN QUEBEC BY LATE THIS EVENING. WARM AND HUMID AIR WILL FLOW NORTH...AHEAD OF THIS SYSTEM INTO WESTERN PENNSYLVANIA...AND SET THE STAGE FOR THUNDERSTORM DEVELOPMENT. THE THUNDERSTORMS WILL BECOME MORE NUMEROUS AS THE AFTERNOON PROGRESSES...PEAKING IN THE EVENING. IN THE SLIGHT RISK AREA...THE PRIMARY THREAT FROM ANY THUNDERSTORM THAT FORMS WILL BE STRONG... DAMAGING WINDS IN EXCESS OF 58 MPH. JUST TO THE EAST OF THE SLIGHT RISK AREA FROM THE NORTH CENTRAL MOUNTAINS...SOUTHWEST TO THE LAUREL HIGHLANDS...A FEW STORMS COULD BECOME STRONG...WITH WIND GUSTS TO 50 MPH POSSIBLE. STORMS WILL AFFECT THESE AREAS MAINLY FROM MID AFTERNOON THROUGH THE EVENING HOURS. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS CONCERNING THE POSSIBILITY OF SEVERE WEATHER THIS AFTERNOON OR EVENING IN WESTERN PENNSYLVANIA. SKYWARN ACTIVATION MAY BE NEEDED LATER TODAY. .END/NICOSIA
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 12:43 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 62 min |
| Jun 2, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 49 min |
| Jun 2, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 49 min |
| Jun 2, 2:48 PM EDT | Severe Thunderstorm Warning | CTP | Somerset | 42 min |
| Jun 2, 3:13 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 62 min |
| Jun 2, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon, Schuylkill | 50 min |
| Jun 2, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | York | 50 min |
| Jun 2, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair | 53 min |
| Jun 2, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Fulton, Huntingdon | 58 min |
| Jun 2, 4:34 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 41 min |
| Jun 2, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Juniata, Mifflin, Perry | 61 min |
| Jun 2, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 61 min |
| Jun 2, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 61 min |
| Jun 2, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Union | 78 min |
| Jun 2, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 78 min |
| Jun 2, 5:27 PM EDT | Severe Thunderstorm Warning | CTP | Snyder | 78 min |
| Jun 2, 5:47 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 73 min |
| Jun 2, 5:55 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin | 65 min |
| Jun 2, 7:15 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 60 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.