Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 76, NWS State College, PA

July 7, 1997Tioga County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 7, 1997, 3:37 PM EDT for Tioga County, Pennsylvania. It was in force for 63 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: Jul 7, 1997, 3:37 PM EDT (19:37 UTC)
Expired: Jul 7, 1997, 4:40 PM EDT
In force: 63 min
Issued by: NWS State College, PA
Area: Whole counties

County Tioga County, PA

What was reported inside it

Time	Report	Where	Remark
Jul 7, 3:50 PM EDT	Hail 0.88	Blossburg, PA	Two separate thunderstorms crossed Tioga County with dime size hail in Lawrenceville followed by half-inch hail in Wellsboro and nickel size hail in Blossburg.

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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.6 hours before the alert went out and 175 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: 181 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCTP 071937 RRA
SVRCTP
PAC117-072040-

BULLETIN- IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
337 PM EDT MON JUL 7 1997

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 440 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTH CENTRAL PENNSYLVANIA

   ...TIOGA COUNTY
 
AT 333 PM EDT...A SEVERE THUNDERSTORM WAS INDICATED BY STATE
COLLEGE DOPPLER RADAR 2 MILES WEST OF WELLSBORO MOVING SOUTHEAST AT
25 MPH.

THE STORM WILL PASS NEAR THE FOLLOWING LOCATIONS...

WELLSBORO                        BY 338 PM EDT
ANTRIM                           BY 345 PM EDT
MANSFIELD                        BY 355 PM EDT
COVINGTON                        BY 400 PM EDT
BLOSSBURG                        BY 405 PM EDT
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE INDOORS AND STAY AWAY FROM WINDOWS.  HEAVY RAINS
FLOOD ROADS QUICKLY.  DON'T DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD.

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 Jul 7, 1:43 PM EDT, 1 hour 54 minutes earlier.

Area forecast discussion, Jul 7, 1:43 PM EDT, 1 hour 54 minutes before

CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
140 PM EDT MON JUL 7 1997

...ZONE SUGGESTIONS...

...PIT/PHL...MIGHT HAVE TO TWEAK EVENING HRS DEPENDING ON HOW MUCH
DEVELOPMENT WE GET FROM THESE STORMS. OTHER THAN THAT WUD JUST BACK
OFF FROM INCREASING CLOUDS IN THE EAST TMRW.

...DISCUSSION...
SMALL LINE OF STORMS ASSOC WITH WEAK FRONT OVER NRN MTNS LOOKS
POTENTIALLY SEVERE. 88D SAYS 100% PROB OF 1" HAIL SO WARNINGS
STARTING TO FLY. AIRMASS IS MARGINALLY UNSTABLE WITH SOME LOW LEVEL
CONVERGENCE. STORMS ARE MOVING TWD HIGHER THETA-E AIR BUT SHUD
START TO LOSE LL CONVERGENCE. LINE SEEMS TO ALREADY BE LOSING
DEFINITION BACK TWD NW PA AND ERN OHIO. THIS WUD POINT TO NOT
EXPECTING A WIDESPREAD OUTBREAK.

FURTHER EAST AIRMASS HAS YET TO START TO RESPOND TO PROGGED EFFECTS
OF LEE SIDE TROFFING. NO MOISTURE CONVERGENCE AS YET AND MESO DATA
FROM PSU SHOWS LI'S AOA ZERO. SATELLITE SHOWS NO OBVIOUS SIGNS OF
MESOSCALE ORGANIZATION. MAY HAVE TO WAIT TIL LATER IF THINGS GET
GOING AT ALL.

LATER IN WEEK ANOTHER SHORTWAVE APPROACHES AND SPREADS WHAT MAY BE
THE FIRST SIG WIDESPREAD RAINS TO HAPPEN IN A WHILE INTO THE
REGION. AVN TAKES UPPER FLOW WHICH IS FAIRLY ZONAL NOW AND BUCKLES
IT CONSIDERABLY. AS RIDGE IS MADE TO BUILD INTO CTRL CANADA...
RESULT IS DOWNSTREAM INTENSIFICATION OF SHORTWAVE SLIDING EAST OUT
OF THE ROCKIES. WHERE THE FRONTAL OVERRUNNING SETS UP WILL BE ALL
IMPORTANT AS TO WHO GETS HEAVY RAIN. AT THIS TIME AVN MAKES BEST
RAINS SURGE NORTH OF US...BEFORE WE SEE MORE RAIN DEVELOP UNDER
DEEPENING UPPER TROF. ECMWF ALSO DRAWS A PICTURE LIKE THIS...IN
FACT IS DEEPER WITH UPPER LOW AND SUGGESTS A VERY COOL RAIN UNDER
A CLOSING ODFF UPPER LOW WHICH WUD SUPPORT A LOW SOMEWHERE EAST OF
HERE. WHATEVER HAPPENS HOPE TO SEE SOME RAIN...THINGS ARE LOOKING
PRETTY DRY

LA CORTE

In the hours before

Local storm report, Jul 7, 2:12 PM EDT, 1 hour 25 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HARRISBURG, PA
212 PM EDT MON JUL 07 1997

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0130 PM    MYRTLE                    PA   WIND DAMAGE
07/07/97   MCKEAN                         COUPLE TREES BLOWN DOWN 1
                                          WEST OF MYRTLE. SOME HAIL
                                          SIZE UNKNOWN.

Local storm report, Jul 7, 3:16 PM EDT, 21 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HARRISBURG, PA
316 PM EDT MON JUL 07 1997

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0130 PM    MYRTLE                    PA   WIND DAMAGE
07/07/97   MCKEAN                         COUPLE TREES BLOWN DOWN 1
                                          WEST OF MYRTLE. SOME HAIL
                                          SIZE UNKNOWN.

0140 PM    SHINGLEHOUSE              PA   .88 INCH HAIL
07/07/97   POTTER                         THUMB SIZE HAIL FELL
                                          AROUND SHINGLEHOUSE

0225 PM    LAWRENCEVILLE             PA   .75 INCH HAIL
07/07/97   TIOGA

DUNHAM

Local storm report, Jul 7, 3:17 PM EDT, 20 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HARRISBURG, PA
316 PM EDT MON JUL 07 1997

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0130 PM    MYRTLE                    PA   WIND DAMAGE
07/07/97   MCKEAN                         COUPLE TREES BLOWN DOWN 1
                                          WEST OF MYRTLE. SOME HAIL
                                          SIZE UNKNOWN.

0140 PM    SHINGLEHOUSE              PA   .88 INCH HAIL
07/07/97   POTTER                         THUMB SIZE HAIL FELL
                                          AROUND SHINGLEHOUSE

0225 PM    LAWRENCEVILLE             PA   .75 INCH HAIL
07/07/97   TIOGA

DUNHAM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 1:14 PM EDT	Severe Thunderstorm Warning	CTP	McKean	61 min
Jul 7, 1:35 PM EDT	Severe Thunderstorm Warning	CTP	Potter	65 min
Jul 7, 2:12 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	48 min
Jul 7, 4:12 PM EDT	Severe Thunderstorm Warning	CTP	Sullivan	63 min
Jul 7, 5:09 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming	61 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1997 Every severe thunderstorm warning in 1997

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.