Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 164, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Dec 9, 2009, 1:31 PM EST for Elk County, McKean County, Warren County, Pennsylvania. It was in force for 59 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
- Dec 9, 2009, 1:31 PM EST (18:31 UTC)
- Expired
- Dec 9, 2009, 2:30 PM EST
- In force
- 59 min
- Issued by
- NWS State College, PA
- Area
- Storm-based polygon
Counties Elk County, PA, McKean County, PA, Warren County, PA
The radar
The State College radar (KCCX), 109 km from the middle of the area, began a volume at 18:33 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
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.5 hours before the alert went out and 139 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
- 535 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 980 m²/s²
- 0-3 km storm-relative helicity
- 1194 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Dec 9, 12:48 PM EST, 43 minutes earlier.
Area forecast discussion, Dec 9, 12:48 PM EST, 43 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 1248 PM EST WED DEC 9 2009 .SYNOPSIS... STRONG LOW PRESSURE WILL PASS NORTH OF PENNSYLVANIA LATE TODAY...PUSHING A SHARP COLD FRONT THROUGH THE STATE. A BROAD UPPER LEVEL TROUGH WILL SET UP OVER THE NORTHERN CONUS THROUGH SATURDAY...THEN LIFT OUT BY LATE IN THE WEEKEND. A SHORTWAVE WILL APPROACH FROM THE WEST AROUND NEXT TUESDAY...BRINGING THE NEXT CHANCE OF WIDESPREAD PRECIPITATION. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... VIGOROUS SHORTWAVE AND ASSOCIATED SHARP COLD FRONT WILL PUSH THRU THE AREA THIS AFTERNOON AND EVNEING. MARGINAL INSTABILITY AHEAD OF THIS FEATURE SUGGEST A FEW GUSTY TSRA WILL BE POSSIBLE...SUCH AS OCCURRED OVR INDIANA AND OHIO EARLIER THIS MORNING. WIND ADVISORY CONTINUES FOR THE ALLEGHENY MTNS LATE TDY/TONIGHT... WHERE BUFKIT PROFILES SHOW THE INCREASINGLY DEEP MIXED LAYER TAPPING 50-60 KT WINDS FROM JUST A FEW THOUSAND FEET ABOVE THE SURFACE. HAVE OPTED TO INCLUDE CENTRAL AND EASTERN PA IN WIND ADVISORIES AS WELL...TIME STEPPED FROM LATE AFTN TO EARLY THIS EVENING AS THE FRONT APPROACHES. FLOOD WATCH DROPPED AS STEADY RAINS HAVE ENDED. SOUTHEAST COUNTIES SAW BETWEEN THREE QUARTERS AND 1.50 INCHES. WATCHING SMALL STREAMS IN THE YORK AND EAST BERLIN AREAS CLOSELY HOWEVER. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/... STRONG/GUSTY WESTERLY FLOW WILL ADVECT COLDEST AIRMASS OF THE SEASON INTO PA TONIGHT. WIND CHILL READINGS LIKELY TO DIP INTO THE TEENS...WITH SINGLE DIGITS OVR THE ALLEGHENIES. BLYR FLOW FROM THE WSW SHOULD KEEP FOCUS OF LAKE EFFECT SNOW NORTH OF THE BORDER...WHERE AN INTENSE SINGLE LES BAND SHOULD AFFECT WESTERN NY STATE. FURTHER SOUTH...OROGRAPHIC EFFECTS WILL PRODUCE A CHC OF -SHSN ACROSS THE ALLEGHENIES OF PA WITH LIGHT ACCUMS OF LESS THAN AN INCH MOST LIKELY. MAINLY DRY/COLD PATTERN SHOULD HOLD THROUGH THURS...AS LAKE EFFECT REMAINS FOCUSED NORTH OF BORDER. ENS MEAN 850 TEMPS ARND -14C SUGGEST HIGHS FROM THE 20S MTNS...TO L30S SUSQ VALLEY. A GUSTY WEST WIND WILL CONTINUE TO MAKE IT FEEL EVEN COLDER WITH WIND CHILLS IN THE TEENS/20S. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... ACTIVE WEATHER PATTERN CONTINUES THROUGH THE PERIOD. CORE OF COLD SHOULD MOVE OVR THE REGION THURS NITE/FRIDAY...WHEN ENS MEAN 850 TEMPS DIP AS LOW AS -20C. WINDS SHOULD REMAIN UP...SO DON/T SEE SUB ZERO LOWS. HOWEVER...TEMPS LIKELY TO STRUGGLE TO GET OUT OF THE TEENS FRIDAY AFTN OVR THE HIGH TERRAIN...WHILE EVEN THE LOWER SUSQ LIKELY TO REMAIN BLW FREEZING. BLYR FLOW STILL APPEARS TO FAVOR SINGLE BAND JUST NORTH OF THE BORDER...ALTHOUGH IT MAY GRAZE WARREN COUNTY FRI/FRI NITE. SFC RIDGE SLIPS IN FROM THE SOUTH SAT/SUN...BUT LOOKS LIKE IT WILL BREAK DOWN QUICKLY UNDER PROGRESSIVE FLOW. SHORTWAVE SLIDES NE FROM GULF OF MEXICO STATES AND COULD POTENTIALLY BRING SOME LIGHT SNOW TO SOUTHERN PA SAT NIGHT/SUN. ALTHOUGH LATEST NAEFS/OPER EC SUGGEST THIS IS AN INCREASINGLY UNLIKELY EVENT. SHORTWAVE APPROACHING FROM THE N PLAINS WILL BRING NEXT CHC OF WIDESPREAD PRECIP ARND TUESDAY OF NEXT WEEK. CURRENT GEFS/OPER EC TRACK SFC LOW WEST OF PA...INDICATING A BRIEF WARM UP...FOLLOWED BY SHRASN WITH FROPA. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... WIDESPREAD MVFR CONDS WILL PERSIST FOR NEXT SEVERAL HOURS DESPITE MAIN PCPN SHIELD LIFTING NORTH OF THE AREA OVER THE NEXT FEW HOURS. CIGS SHOULD IMPROVE TO VFR MOST AIRFIELDS LATER THIS AM AS DRY SLOT MOVES OVER THE REGION. JST AND BFD MY LINGER IN MVFR MOST OF THE DAY WITH INCREASING WRLY FLOW INTO THE MTNS. BIGGER ISSUE LATER TODAY AND TONIGHT WILL BE SIG WINDS ARRIVING BEHIND FROPA THIS AFTN. WINDS WILL SHIFT TO THE NW LATE THIS AFTN...BUT WITH SUCH DEEP SYSTEMS...WINDS WILL TEND MORE FROM THE SW THAN OFTEN FCST. THIS ALONG WITH A LOT OF DIRECTIONAL SHEAR...LAKE EFFECT WILL BE SLOW TO GET INTO THE AREA IN THE TIME FRAME FROM LATE WED INTO THU AND FRI. BEST CHC WILL BE LATER ON THU INTO FRIDAY ACROSS THE MTS. OUTLOOK... WED NIGHT/THUR...MVFR/IFR NORTH AND WEST IN SNOW SHOWERS MAINLY IN THE MOUNTAINS. STRONG WESTERLY WNDS. FRI/FRI NIGHT...MVFR (AND LOCALIZED IFR) WEST WITH SCATTERED SNOW SHOWERS IN MTNS OF NORTHERN AND WESTERN PA. VFR MOST OF CENTRAL AND EAST. STILL WINDY. SAT/SUN...VFR...POSSIBLY DECREASING TO IFR/MVFR SHOULD A SYSTEM ALONG THE CAROLINA COAST EDGE A LITTLE FARTHER NW...AND PROVIDE THE REGION WITH LIGHT SNOW. && .CTP WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY UNTIL 6 AM EST THURSDAY FOR PAZ012-018-019- 025>027-034-035-037-041-042-045-046. WIND ADVISORY UNTIL 6 AM EST THURSDAY FOR PAZ004>006-010-011- 017-024-033. WIND ADVISORY FROM 5 PM THIS AFTERNOON TO 6 AM EST THURSDAY FOR PAZ028-036-049>053-056>059-063>066. && SYNOPSIS...FITZGERALD NEAR TERM...DEVOIR/FITZGERALD SHORT TERM...FITZGERALD LONG TERM...FITZGERALD/RXR AVIATION...GARTNER/MARTIN
Hazardous weather outlook, Dec 9, 8:21 AM EST, 5 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 821 AM EST WED DEC 9 2009 PAZ012-018-019-025>028-034>037-041-042-045-046-049>053-056>058-063- 101330- NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-BLAIR-HUNTINGDON- MIFFLIN-JUNIATA-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING- SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR- NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-CUMBERLAND- 821 AM EST WED DEC 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. A STRONG COLD FRONT WILL CROSS THE AREA LATER TODAY INTO TONIGHT. THIS WILL BRING GUSTY WINDS TO 40 MPH AND TEMPERATURES DROPPING BELOW FREEZING ACROSS THE CENTRAL AND NORTHERN MOUNTAINS BY MIDNIGHT AND OVER MOST OF THE LOWER SUSQUEHANNA RIVER VALLEY IN THE PREDAWN HOURS THURSDAY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ004>006-010-011-017-024-033-101330- WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET- 821 AM EST WED DEC 9 2009 ...WIND ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 AM EST THURSDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ059-064>066-101330- LEBANON-ADAMS-YORK-LANCASTER- 821 AM EST WED DEC 9 2009 ...FLOOD WATCH IN EFFECT UNTIL 4 PM EST THIS AFTERNOON... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLOOD WATCH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 9, 3:29 AM EST | Flood Watch | CTP | Adams, Lancaster, Lebanon, York | 9 hr |
| Dec 9, 3:38 AM EST | Wind Advisory | CTP | Adams, Bedford, Blair, Cambria, Cameron, Centre and 27 more | 26 hr |
| Dec 9, 1:04 PM EST | Severe Thunderstorm Warning | CTP | Warren | 56 min |
| Dec 9, 1:41 PM EST | Special Weather Statement | CTP | Clearfield | 49 min |
| Dec 9, 1:49 PM EST | Severe Thunderstorm Warning | CTP | Cambria, Clearfield, Somerset | 41 min |
| Dec 9, 2:51 PM EST | Special Weather Statement | CTP | Centre, Clinton, Lycoming, Mifflin | 39 min |
| Dec 9, 3:27 PM EST | Special Weather Statement | CTP | Clearfield, Elk | 33 min |
| Dec 9, 3:52 PM EST | Special Weather Statement | CTP | Cambria | 38 min |
| Dec 9, 3:57 PM EST | Special Weather Statement | CTP | Cameron | 33 min |
| Dec 9, 4:05 PM EST | Special Weather Statement | CTP | Blair, Huntingdon | 40 min |
| Dec 9, 4:23 PM EST | Special Weather Statement | CTP | Centre, Clinton | 37 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009
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.