Alert archive / Pennsylvania / Tornado Warnings in 1999
Tornado Warning 4, NWS State College, PA
NWS State College, PA issued this tornado warning at Jul 9, 1999, 6:56 PM EDT for Warren County, Pennsylvania. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 9, 1999, 6:56 PM EDT (22:56 UTC)
- Expired
- Jul 9, 1999, 7:45 PM EDT
- In force
- 49 min
- Issued by
- NWS State College, PA
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Warren County, PA
The radar
The Buffalo radar (KBUF), 133 km from the middle of the area, began a volume at 22:55 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 9, 6:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.9 hours before the alert went out and 132 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
- 1155 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 519 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCTP 092300 RRA TORCTP PAC123-092345- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE STATE COLLEGE PA 656 PM EDT FRI JUL 9 1999 THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A * TORNADO WARNING FOR... WARREN COUNTY. * UNTIL 745 PM EDT. * AT 652 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM WITH A DEVELOPING TORNADO 5 MILES NORTHWEST OF YOUNGSVILLE...OR ABOUT 13 MILES EAST OF CORRY...MOVING EAST AT 30 MPH. * THE TORNADO IS EXPECTED TO BE NEAR... WARREN AT 715 PM EDT. CLARENDON AT 725 PM EDT. THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING WHICH WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR ROOM ON THE LOWEST FLOOR! .END/ JUNG LAT...LON 4195 7960 4168 7954 4169 7904 4197 7902
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Jul 9, 1:45 PM EDT, 5 hours 11 minutes earlier.
Area forecast discussion, Jul 9, 1:45 PM EDT, 5 hours 11 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 145 PM EDT FRI JUL 9 1999 SFC SW FLO CRANKING UP ATTM. FLO ALOFT ALREADY THERE PER VWP FM KCCX AND KBUF. BEST DWPTS STILL IN OH...BUT ADVECTING NICELY ALOFT AND AT SFC. MINI ECHOES ALREADY POPPED ALONG GOOD WAA BOUNDARY IN OUR NRN FA. BUT THAT ACTIVITY IS RACING EAST WITH LLJ - >50KTS ON SPEED THAT KIND OF CELL MOVEMENT DOESNT TAKE TOO MUCH MIXING TO PRODUCE DAMAGE OUT OF A THUNDERSTORM. THE OL SUMMER/DROUGHT OF 99 NO-RAIN SHAFT OF STATE COLLEGE APPEARS AGAIN ON MODEL QPF PRODUCTS. THIS MAY BE MDLS PICKING UP ON WEAKER INSTAB OV MTNS. ANYWAY...THE TREND IN MOST RECENT MDL RUNS IS TO PUT LOWER POPS/QPF INTO CENTL MTNS AND LWR SUSQ. MOSTLY CONSISTENT WITH THINKING ATTM...BUT STILL BELIEVE THE MORE LIKELY SCENARIO IS A SQULL LINE TO FORM AND DROP SEWD INTO MTNS...WEAKENING AS IT DOES SO. MOST/ALL SVR ACTIVITY SHUD BE CONTAINED TO N&W OF IPT-UNV-AOO LINE TONIGHT. LATEST RUC POINTING TO START UP CONVECTION BY 21Z IN NW PA...CONSISTENT WITH EARLIER THINKING. POPS TONIGHT TO BE CAT IN WRN ZNS/LIKELY IN CENTL&MID SUSQ AND CHC IN SE (MAINLY LATE). AS THE SQUALL LINE WEAKENS...IT WL MOST LIKELY SPIT INTO TWO AREAS OF CNVCTN - ONE DROPPING STRAIGHT SOUTH THROUGH THE LAURELS (FEEDING OFF THE TERRIFIC THTE ADV AND LLJ FM SW)...AND ONE THAT GOES WITH BEST WAA/UPR SUPPORT TWD ELM/BGM. THE FNT DOES LOOK TO HANG UP AS IT MOVES THRU OUR AREA...BUT REAL FNT AND NNW FLO DOES NOT MAKE IT THRU FA UNTIL AFTER 12Z. THEREFORE CHC POPS WL REMAIN IN FAR SRN ZNS...INCL THE LWR SUSQ...IN EARLY SAT PD. DRYING/MO SUN FOR REST OF FA ON SAT AND COOLER/FAIR FOR SUN. XTNDD: FRIENDLY HIGH PRES FOR BEGINNING OF WEEK. SLIGHT WARMING TREND THRU XTNDD PD...AND CHC WORDING MAKES RETURN ON TUES FOR EVERYONE AND WED AS WELL FOR ERN ZNS AS MRF DEVELOPS WAVE ALONG FNT THAT HANGS UP IN SE US. THE WAVE AND WAA RIDES THE RETURN FLOW OF THE SFC HI AS IT MOVES OFF THE EAST COAST. .CTP...NONE. DANGELO
In the hours before
Special weather statement, Jul 9, 3:15 PM EDT, 3 hours 41 minutes before
PAZ004>006-010>012-017>019-024>028-033>035-037-041-042-045-046- 049>053-100400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 315 PM EDT FRI JUL 9 1999 ...THERE CONTINUES TO BE A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS NORTHERN AND WEST-CENTRAL PENNSYLVANIA THIS EVENING AND TONIGHT... WARM...HUMID AIR HAS MOVED INTO THE STATE FROM THE WEST THIS AFTERNOON. THUNDERSTORMS HAVE ALREADY BEGUN TO POP UP IN THE UNSTABLE AIR. AS THE EVENING CONTINUES...A COLD FRONT WILL APPROACH PENNSYLVANIA FROM THE NORTHWEST. THE APPROACH OF THIS FRONT WILL TRIGGER MORE SHOWERS AND THUNDERSTORMS. THE COMBINATION OF THE WARM...HUMID AIR AT THE SURFACE AND THE FAST WINDS ALOFT WILL CREATE THE POTENTIAL FOR DAMAGING WINDS TO COME OUT OF THE THUNDERSTORMS. THE MOST LIKELY SCENARIO FOR THIS EVENING IS THAT A LONG LINE OF THUNDERSTORMS WILL DEVELOP LATER THIS EVENING AND DROP TO THE SOUTHEAST...INTO WESTERN PENNSYLVANIA AND THE CENTRAL MOUNTAINS DURING THE NIGHT. THE SCATTERED THUNDERSTORMS ALREADY FORMING LATE THIS AFTERNOON HAVE THE POTENTIAL TO PRODUCE DAMAGING WINDS... LARGE HAIL AND EVEN TORNADOES. AGAIN...THE MAIN THREAT FOR THIS EVENING WILL BE DAMAGING THUNDERSTORM WIND GUSTS. PLEASE STAY TUNED TO YOUR NOAA WEATHER RADIO...A COMMERCIAL RADIO OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS AND POSSIBLE SEVERE THUNDERSTORM WATCHES FROM THE NATIONAL WEATHER SERVICE. SKYWARN ACTIVATION WILL LIKELY BE NEEDED THIS EVENING. .END/DANGELO
Special weather statement, Jul 9, 3:15 PM EDT, 3 hours 41 minutes before
PAZ004>006-010>012-017>019-024>028-033>035-037-041-042-045-046- 049>053-100400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 315 PM EDT FRI JUL 9 1999 ...THERE CONTINUES TO BE A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS NORTHERN AND WEST-CENTRAL PENNSYLVANIA THIS EVENING AND TONIGHT... WARM...HUMID AIR HAS MOVED INTO THE STATE FROM THE WEST THIS AFTERNOON. THUNDERSTORMS HAVE ALREADY BEGUN TO POP UP IN THE UNSTABLE AIR. AS THE EVENING CONTINUES...A COLD FRONT WILL APPROACH PENNSYLVANIA FROM THE NORTHWEST. THE APPROACH OF THIS FRONT WILL TRIGGER MORE SHOWERS AND THUNDERSTORMS. THE COMBINATION OF THE WARM...HUMID AIR AT THE SURFACE AND THE FAST WINDS ALOFT WILL CREATE THE POTENTIAL FOR DAMAGING WINDS TO COME OUT OF THE THUNDERSTORMS. THE MOST LIKELY SCENARIO FOR THIS EVENING IS THAT A LONG LINE OF THUNDERSTORMS WILL DEVELOP LATER THIS EVENING AND DROP TO THE SOUTHEAST...INTO WESTERN PENNSYLVANIA AND THE CENTRAL MOUNTAINS DURING THE NIGHT. THE SCATTERED THUNDERSTORMS ALREADY FORMING LATE THIS AFTERNOON HAVE THE POTENTIAL TO PRODUCE DAMAGING WINDS... LARGE HAIL AND EVEN TORNADOES. AGAIN...THE MAIN THREAT FOR THIS EVENING WILL BE DAMAGING THUNDERSTORM WIND GUSTS. PLEASE STAY TUNED TO YOUR NOAA WEATHER RADIO...A COMMERCIAL RADIO OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS AND POSSIBLE SEVERE THUNDERSTORM WATCHES FROM THE NATIONAL WEATHER SERVICE. SKYWARN ACTIVATION WILL LIKELY BE NEEDED THIS EVENING. .END/DANGELO
Local storm report, Jul 9, 5:04 PM EDT, 1 hour 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
504 PM EDT FRI JUL 09 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0410 PM BROCKPORT PA WIND DAMAGE
07/09/99 ELK NUMEROUS TREES DOWN
0412 PM RIDGWAY PA WIND DAMAGE
07/09/99 ELK MANY TREES DOWN ON TOBY
ROAD...IN FOX TOWNSHIP...6
MILES SOUTH OF RIDGWAY.
0415 PM RIDGWAY PA 1 INCH HAIL
07/09/99 ELK QUARTER SIZE HAIL 1 MILE
SOUTH OF RIDGWAY...AT EMA
OFFICESpecial weather statement, Jul 9, 5:20 PM EDT, 1 hour 36 minutes before
PAZ004-100300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 520 PM EDT FRI JUL 9 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 11 PM FOR WARREN COUNTY... A COLD FRONT...ENTERING OHIO EARLY THIS EVENING...WILL PUSH INTO PENNSYLVANIA OVERNIGHT. THUNDERSTORMS WILL DEVELOP AHEAD OF THE FRONT AND AFFECT MUCH OF WESTERN PENNSYLVANIA DURING THIS EVENING. ANY STORMS THAT FORM WILL HAVE THE POTENTIAL TO PRODUCE STRONG DAMAGING WINDS AND LARGE HAIL. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. REMEMBER SEVERE THUNDERSTORMS CAN SOMETIMES PRODUCE TORNADOES. PLEASE STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS AND POSSIBLE WARNINGS. .END/FITZGERALD
Special weather statement, Jul 9, 5:20 PM EDT, 1 hour 36 minutes before
PAZ004-100300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 520 PM EDT FRI JUL 9 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 11 PM FOR WARREN COUNTY... A COLD FRONT...ENTERING OHIO EARLY THIS EVENING...WILL PUSH INTO PENNSYLVANIA OVERNIGHT. THUNDERSTORMS WILL DEVELOP AHEAD OF THE FRONT AND AFFECT MUCH OF WESTERN PENNSYLVANIA DURING THIS EVENING. ANY STORMS THAT FORM WILL HAVE THE POTENTIAL TO PRODUCE STRONG DAMAGING WINDS AND LARGE HAIL. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. REMEMBER SEVERE THUNDERSTORMS CAN SOMETIMES PRODUCE TORNADOES. PLEASE STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER STATEMENTS AND POSSIBLE WARNINGS. .END/FITZGERALD
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | Elk | 58 min |
| Jul 9, 4:02 PM EDT | Tornado Warning | CTP | Elk | 28 min |
| Jul 9, 4:25 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield | 65 min |
| Jul 9, 4:42 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton | 63 min |
| Jul 9, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Snyder, Union | 55 min |
| Jul 9, 6:39 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 66 min |
| Jul 9, 7:26 PM EDT | Severe Thunderstorm Warning | CTP | McKean | 64 min |
| Jul 9, 7:45 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 30 min |
Nearby
Tornado Warnings in Pennsylvania, 1999Every tornado warning in 1999Tornadoes 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.