Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 92, NWS State College, PA

June 27, 2002Centre County, Clearfield County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 27, 2002, 12:00 PM EDT for Centre County, Clearfield County, Pennsylvania. It was in force for 60 min. 2 reports 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 27, 2002, 12:00 PM EDT (16:00 UTC)
Expired: Jun 27, 2002, 1:00 PM EDT
In force: 60 min
Issued by: NWS State College, PA
Area: Whole counties

Counties Centre County, PA, Clearfield County, PA

The radar

The State College radar (KCCX), 13 km from the middle of the area, began a volume at 16:00 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 27, 12:35 PM EDT	Thunderstorm Wind 50 E	Westover, PA	Trees were down in Harmony, 4 miles northwest of Westover.
Jun 27, 12:45 PM EDT	Thunderstorm Wind 50 E	Bellefonte, PA	Trees were down in 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

Pittsburgh, PA (KPIT), launched 12:00Z, 4.0 hours before the alert went out and 176 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1167 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KCTP 271600
SVRCTP
PAC027-033-271700-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1159 AM EDT THU JUN 27 2002

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLEARFIELD COUNTY IN PENNSYLVANIA
  CENTRE COUNTY IN PENNSYLVANIA

* UNTIL 100 PM EDT.

* AT 1159 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER CURWENSVILLE...OR 7 MILES SOUTHWEST OF
  CLEARFIELD...MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  OSCEOLA MILLS AT 1210 PM.
  PHILIPSBURG AT 1215 PM.
  BLACK MOSHANNON SP AT 1225 PM.
  PORT MATILDA AT 1230 PM.

THE MAIN THREAT FROM THIS STORM IS A DAMAGING WIND GUST AND LARGE HAIL. 
EXPECT GUSTS TO EXCEED 60 MPH. THESE WINDS CAN EASILY KNOCK DOWN 
TREES AND POWER LINES...AND CAUSE PROPERTY DAMAGE. LARGE HAIL IS 
ALSO POSSIBLE. THE SAFEST PLACE TO BE DURING A SEVERE THUNDERSTORM 
IS INSIDE A SUBSTANTIAL SHELTER...AWAY FROM WINDOWS.

$$

DEVOIR

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 27, 10:47 AM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, Jun 27, 10:47 AM EDT, 1 hour 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE
945 AM THU JUN 27 2002

UPDATING MAINLY TO REMOVE MORN/AFTN WORDING REFERENCES.

SPC NOW HAS MUCH OF PA IN SLIGHT RISK FOR POTENTIAL OF SOME
MARGINALLY SEVERE WIND GUSTS. AGREE AND WILL KEEP THUNDERSTORM GUSTS
AND ADD POTENTIAL FOR HEAVY RAIN IN ZONES. REGIONAL SOUNDINGS SHOW
UPR LEVEL WIND SPEEDS HAVE INCREASED OVER THE PAST FEW DAYS TO ABOUT
30KTS WITH MORE CONSISTENT UNIDIRECTIONAL SHEAR. HOWEVER BELIEVE UPR
SUPPORT/PROFILE IS LACKING FOR WELL ORGANIZED WIDESPREAD STRONG
WINDS WITH MAIN SFC LOW OVER ERN CAN.

LIKELY POPS NORTH AND CHANCE ELSEWHERE IN CURRENT ZONES LOOKS GOOD.

NO CHANGES BEYOND FIRST PD.
WRKZONES ALREADY ON THE STREET.

.CTP...SPS FOR SLIGHT RISK OF SEVERE FOR ALL OF CENTRAL PA.

GARTNER

In the hours before

Special weather statement, Jun 27, 9:25 AM EDT, 2 hours 35 minutes before

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-272030-

SEVERE WEATHER OUTLOOK...RETRANSMITTED
NATIONAL WEATHER SERVICE STATE COLLEGE PA
925 AM EDT THU JUN 27 2002

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
THIS EVENING ACROSS PORTIONS OF CENTRAL PENNSYLVANIA...

A WEAK COLD FRONT WILL SAG SOUTHEASTWARD ACROSS THE OHIO VALLEY THIS
AFTERNOON.  A MOIST AND UNSTABLE AIR MASS EXISTS ACROSS CENTRAL
PENNSYLVANIA AND SHOWERS AND THUNDERSTORMS WILL AGAIN DEVELOP OUT
AHEAD OF THE FRONT THIS AFTERNOON AND EVENING.

DESPITE UPPER LEVEL WINDS OF SOMEWHAT MARGINAL STRENGTH...A FEW OF
THE STORMS COULD PRODUCE LOCALIZED STRONG OR POTENTIALLY DAMAGING
WIND GUSTS THIS AFTERNOON AND EVENING.  IN ADDITION...THE STORMS
WILL PRODUCE LOCALLY HEAVY RAINFALL.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES. SKYWARN ACTIVATION MAY BE NEEDED LATER TODAY.

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT
WWW.NWS.NOAA.GOV/ER/CTP

DEVOIR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 2:42 PM EDT	Flash Flood Warning	CTP	Clearfield	3 hr
Jun 27, 3:27 PM EDT	Severe Thunderstorm Warning	CTP	Centre	63 min
Jun 27, 4:06 PM EDT	Severe Thunderstorm Warning	CTP	Potter	54 min
Jun 27, 4:12 PM EDT	Severe Thunderstorm Warning	CTP	Snyder, Union	63 min
Jun 27, 5:34 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin	56 min
Jun 27, 5:40 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon	65 min
Jun 27, 6:26 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland	19 min
Jun 27, 6:28 PM EDT	Severe Thunderstorm Warning	CTP	York	62 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2002 Every severe thunderstorm warning in 2002

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.