Severe Thunderstorm Warning 137, NWS State College, PA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
320 AM EDT WED AUG 14 2002

COMPACT UPR VORT MAX NOTED ON WTR VAPOR IMAGERY WAS JUST S OF KUNV
AT 07Z AND LIFTING NE AROUND 15 KT. ENHANCED...20-30 KT 925-850 HPA
JET ON THE EASTERN SIDE OF THIS FEATURE WAS PROVIDING A SURGE OF
WARM ADVECTION AND THETA-E CONVERGENCE TO FUEL SOME SCTD STRONG
TSRA. THE SHORT WAVE WILL CLEAR OUR NE COUNTIES DURING THE 12Z-15Z
WINDOW.

MORE SCTD STRONG...TO PERHAPS SVR STORMS WILL DEVELOP IN THE HIGH
HEAT AND HUMIDITY THIS AFTERNOON...AND CONTINUE INTO THE EVENING.
THE BEST CHC FOR INTENSE STORMS WILL BE TO NW OF A KAOO TO KUNV AND
KIPT LINE...WHERE LEFTOVER BOUNDARIES FROM THIS MORNINGS CONVECTION
WILL COMBINE WITH STRONG DIFFERENTIAL HEATING ALONG THE EASTERN EDGE
OF THE THICKER CLOUDS SPREADING EAST FROM OHIO. ANOTHER FAVORED AREA
APPEARS TO BE THE LOWER SUSQ REGION ON THE EASTERN EDGE OF THE RAIN
COOLED AIR.

BASED ON TUESDAYS MAXS ACROSS THE REGION AND VERY SIMILAR
CONDITIONS FOR TODAY...RECORD HIGH AT KMDT OF 97 F IN 1944 SHOULD BE
TIED OR BROKEN BY A DEG OR SO. SUBSIDENCE AND A SEVERAL HOUR PERIOD
OF DRYING BEHIND THE CURRENT VORT MAX MOVING ACROSS THE AREA SHOULD
VEER WINDS AROUND SLIGHTLY TO THE SW AT 10 TO 15 MPH...LEADING TO A
FAVORABLE SETUP FOR THE RECORD HEAT ACROSS THE LOWER SUSQ. RECORD
FOR KIPT IS 98 IN 1944...BUT MORNING CLOUDS AND TSRA FOLLOWED BY A
MODERATE AMOUNT OF HEATING USED FOR EVAPORATION SHOULD LIMIT HIGHS
TO THE LOWER TO MID 90S ACROSS THE CENTRAL SUSQ VALLEY REGION.

WEAK COLD FRONT WILL SLIDE EAST ACROSS THE REGION THURSDAY...
ACCOMPANIED BY HIGH PWATS OF 1.75 TO 2.0 INCHES WILL CREATE A
POTENTIAL FOR LOCALLY HEAVY RAIN OF 2-3 INCHES FROM TRAINING TSRA.

THE FRONT SAGS SOUTH INTO THE VIRGINIAS ON FRI AS UPR LVL WINDS VEER
TO A MORE WSW DIRECTION ACROSS THE GREAT LAKES. UPR FLOW BACKS ONCE
AGAIN BY SATURDAY IN RESPONSE TO ANOTHER SHORT WAVE MOVING ACROSS
THE NRN PLAINS STATES. THIS WILL BRING A CHC OF SHOWERS FOR SAT AND
SAT EVENING WITH SUNDAY LIKELY BEING ANOTHER HOT AND HUMID DAY NOT
TOO DISSIMILAR FROM THE PAST FEW.

.CTP...SPS FOR HEAT COVERING ALL BUT N MTNS AND LAUREL HIGHLANDS.

       SEVERE WEATHER OUTLOOK (SPS) FOR THE NW 1/2 OF THE CWA THIS
       AFTERNOON AND EVENING.

LAMBERT

PAZ019-025>028-034>036-045-046-049>053-056>059-063>066-141515-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
422 AM EDT WED AUG 14 2002

...HEAT INDICES WILL RANGE FROM 95 TO 104 DEGREES ACROSS THE REGION
AGAIN ON WEDNESDAY...

STATIONARY HIGH PRESSURE OFF THE MIDDLE ATLANTIC COAST WILL CONTINUE
THE SOUTHERLY FLOW OF AIR THAT WILL LEAD TO HOT AND HUMID CONDITIONS
ACROSS ALL OF CENTRAL PENNSYLVANIA THROUGH THURSDAY AFTERNOON.

TEMPERATURES IN THE LOWER TO MID 90S TODAY WILL COMBINE WITH
DEWPOINTS IN THE MID TO UPPER 60S TO PRODUCE AN AFTERNOON HEAT INDEX
AROUND 95 DEGREES ACROSS THE CENTRAL VALLEYS AND NEAR 100 IN THE
MIDDLE SUSQUEHANNA REGION.

APPARENT TEMPERATURES WILL REACH BETWEEN 100 AND 104 DEGREES ACROSS
THE LOWER SUSQUEHANNA VALLEY BETWEEN 1 PM AND 6 PM THIS
AFTERNOON...AS TEMPERATURES CLIMB TO NEAR RECORD LEVELS IN THE MID
TO UPPER 90S.

TEMPERATURES WILL BE SLIGHTLY COOLER ON THURSDAY...BUT HIGH HUMIDITY
LEVELS WILL STILL RESULT IN HEAT INDEX VALUES IN THE 90S.

IN ADDITION...TEMPERATURES WILL REMAIN IN THE 70S FOR MUCH OF THE
NIGHTTIME HOURS TONIGHT...MAKING IT EVEN HARDER TO COOL OFF.
RESIDENTS OF BUILDINGS WITHOUT AIR CONDITIONING IN URBAN AREAS WILL
BE MOST AFFECTED BY THE UNCOMFORTABLY HIGH OVERNIGHT TEMPERATURES.

TO PROTECT YOURSELF FROM THE HEAT...AVOID OUTDOOR ACTIVITIES SUCH
AS YARD WORK AND JOGGING DURING THE MIDDLE OF THE DAY. IF YOU MUST
SPEND TIME OUTDOORS...DRINK PLENTY OF WATER AND TAKE BREAKS IN A
SHADED AREA OR AIR CONDITIONED BUILDING.

REMEMBER TO CHECK ON THE ELDERLY...THE VERY YOUNG...AND THOSE WITH
CHRONIC ILLNESSES SUFFERING FROM RESPIRATORY OR HEART AILMENTS.
THESE INDIVIDUALS ARE MOST SUSCEPTIBLE TO HEAT RELATED HEALTH
PROBLEMS.

REMEMBER YOUR PETS AND LIVESTOCK...AND MAKE SURE THEY HAVE ADEQUATE
SHADE AND PLENTY OF WATER. REFRAIN FROM LEAVING YOUR PETS IN CARS.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAMBERT/RADZANOWSKI

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

PAZ004>006-010>012-017>019-024>028-033>035-037-041-042-045-046-
049>053-141530-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
435 AM EDT WED AUG 14 2002

...SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING
ACROSS PORTIONS OF CENTRAL PENNSYLVANIA...INCLUDING THE NORTHERN
MOUNTAINS AND LAUREL HIGHLANDS ...

HOT AND HUMID AIR IN PLACE ACROSS CENTRAL PENNSYLVANIA WILL FUEL THE
DEVELOPMENT OF SCATTERED STRONG TO POSSIBLY SEVERE THUNDERSTORMS
THIS AFTERNOON INTO THIS EVENING.

THE PRIMARY SEVERE WEATHER THREAT WILL BE LOCALIZED DAMAGING WIND
GUSTS OF 60 MPH OR GREATER.

THE MOST NUMEROUS THUNDERSTORMS WILL LIKELY FORM ACROSS THE HIGHER
ELEVATIONS TO THE NORTHWEST OF A LINE FROM ALTOONA...TO STATE
COLLEGE AND WILLIAMSPORT.

FREQUENT...CLOUD TO GROUND LIGHTNING IS ALWAYS A SIGNIFICANT DANGER
DURING THUNDERSTORMS. REFRAIN FROM STAYING IN OPEN AREAS OR HIGH
GROUND WHEN THUNDERSTORMS APPROACH. IN YOUR HOME...STAY AWAY FROM
ELECTRICAL APPLIANCES AND AVOID USING THE TELEPHONE WHEN FREQUENT
NEARBY THUNDER IS HEARD.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAMBERT

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