Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 40, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jun 2, 1999, 2:48 PM EDT for Somerset County, Pennsylvania. It was in force for 42 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, 2:48 PM EDT (18:48 UTC)
- Expired
- Jun 2, 1999, 3:30 PM EDT
- In force
- 42 min
- Issued by
- NWS State College, PA
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Somerset County, PA
The radar
The Pittsburgh radar (KPBZ), 119 km from the middle of the area, began a volume at 18:49 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, 3:23 PM EDT | Thunderstorm Wind | New Centerville, PA | Trees were down in New Centervile and Myersdale |
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, 6.8 hours before the alert went out and 257 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, 10:33 AM EDT, 4 hours 15 minutes earlier.
Area forecast discussion, Jun 2, 10:33 AM EDT, 4 hours 15 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 1030 AM EDT WED JUNE 2 1999 MAIN WAVE WILL CONTINUE TO TRACK TO OUR NORTH ACROSS NY STATE THIS AFTERNOON AND EVENING. SHOWERS AND THUNDERSTORMS ALREADY BREAKING OUT OVER WESTERN PA THIS MORNING IN AREA OF BEST DYNAMIC LIFT... UPPER LEVEL DIFLUENCE...AND STRONGEST SURFACE WINDS. WITH SURFACE DEWPOINTS IN THE 60S...AND A 500MB JET FORECAST NEAR 40 KTS LATER THIS AFTERNOON...CONVECTIVE ACTIVITY WILL EVENTUALLY SHIFT EASTWARD INTO CENTRAL PA. POPS ON THE RIGHT TRACK THIS MORNING...BUT NUDGED POPS UP A LITTLE MORE TO CATEGORICAL IN THE WEST AND LIKELY IN THE EAST. ACTIVITY WILL NOT MAKE IT TO THE SUSQUEHANNA RIVER COUNTIES UNTIL LATE THIS AFTERNOON...AND WORDED AS SUCH. ALSO BUMPED TEMPS UP WHERE THE SUN HAS BEEN MOST PREVELANT. .CTP...NONE. RXR
In the hours before
Special weather statement, Jun 2, 10:45 AM EDT, 4 hours 3 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, 4 hours 3 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, 4 hours 3 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, 4 hours 3 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, 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, 4:20 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 55 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.