Alert archive / Pennsylvania / Flash Flood Warnings in 1993
Flash Flood Warning 22, NWS State College, PA
NWS State College, PA issued this flash flood warning at Apr 16, 1993, 9:24 AM EDT for Franklin County, Pennsylvania. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 16, 1993, 9:24 AM EDT (13:24 UTC)
- Expired
- Apr 16, 1993, 4:00 PM EDT
- In force
- 7 hr
- Issued by
- NWS State College, PA
- Area
- Whole counties
County Franklin County, PA
The radar
The Sterling radar (KLWX), 108 km from the middle of the area, began a volume at 13:25 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 1.4 hours before the alert went out and 112 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
- 286 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 253 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.4
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Apr 16, 3:45 AM EDT, 5 hours 39 minutes before
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</html>Special weather statement, Apr 16, 5:15 AM EDT, 4 hours 9 minutes before
PAZ007-008-014-161030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 515 AM EDT FRI APR 16 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR NORTHCENTRAL PENNSYLVANIA UNTIL 700 AM... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR ALL OF NORTHCENTRAL PENNSYLVANIA UNTIL 700 AM. THIS INCLUDES...TIOGA...BRADFORD...CLINTON...LYCOMING AND SULLIVAN COUNTIES. A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. SEVERE THUNDERSTORMS CAN CONTAIN STRONG DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL AND DAMAGING LIGHTNING. PERSONS IN THE PATH OF THESE STORMS SHOULD TAK8E COVER IF THREATENING WEATHER APPROACHES. INTERIOR LOCATIONS OF A STURDY BUILDING PROVIDE THE BEST PROTECTION AGAINST SEVERE THUNDERSTORMS. PMG/HM
Special weather statement, Apr 16, 5:27 AM EDT, 3 hours 57 minutes before
PAZ006-008-009-013-014-161100- SPECIAL WEATHER STATEMENT...SEVERE THUNDERSTORM WATCH NATIONAL WEATHER SERVICE HARRISBURG PA 515 AM EDT FRI APR 16 1993 ...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 7 AM FOR MUCH OF CENTRAL PENNSYLVANIA...INCLUDING PORTIONS OF THE SOUTH CENTRAL MOUNTAINS AND LOWER SUSQUEHANNA VALLEY.... ...SHOWERS AND THUNDERSTORMS ARE MOVING THROUGH THE CENTRAL MOUNTAINS... AT 515 AM HARRISBURG RADAR WAS SHOWING AN AREA OF SHOWERS AND THUNDERSTORMS... SOME WITH HEAVY RAIN ACROSS THE CENTRAL AND LAUREL MOUNTAINS. THE SHOWERS AND THUNDERSTORMS WERE NOW BEGINNING TO MOVE INTO WESTERN PORTIONS OF THE SUSQUEHANNA VALLEY. THE STRONGEST STORMS WERE OVER BLAIR AND BEDFORD COUNTIES IN THE SOUTH CENTRAL MOUNTAINS. INDIVIDUAL CELLS WERE MOVING NORTHEAST AT 50 MPH WHILE THE ENTIRE AREA WAS SLIDING EAST AT ABOUT 30 MPH. THESE THUNDERSTORMS MAY PRODUCE HEAVY DOWNPOURS...DAMAGING WINDS AND HAIL AS THEY MOVE EAST INTO THE SUSQUEHANNA VALLEY. IF THREATENING WEATHER APPROACHES...GO TO A SAFE PLACE IMMEDIATELY. IF YOU ARE DRIVING...PULL OVER AND TAKE COVER IN A LOW SPOT. WATCH FOR PONDING WATER AS WELL. ALSO...ALLOW FOR A LITTLE EXTRA TIME IN YOUR MORNING COMVMUTE TO WORK. IF SEVERE WEATHER IS OBSERVED...CONTACT YOUR LOCAL LAW ENFORCEMENT AGENCY AND ASK THEM TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE. STAY TUNED TO NOAA WEATHER RADIO FOR LATER STATEMENTS AND POSSIBLE WARNINGS. RODGERS
Special weather statement, Apr 16, 5:30 AM EDT, 3 hours 54 minutes before
PAZ007-008-014-161030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 530 AM EDT FRI APR 16 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR NORTHCENTRAL PENNSYLVANIA UNTIL 700 AM... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR ALL OF NORTHCENTRAL PENNSYLVANIA UNTIL 700 AM. THIS INCLUDES...TIOGA...BRADFORD...CLINTON...LYCOMING AND SULLIVAN COUNTIES. A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. SEVERE THUNDERSTORMS CAN CONTAIN STRONG DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL AND DAMAGING LIGHTNING. AT 515 AM EDT SHOWED AN AREA OF SHOWESR AND LOCALLY STRONG THUNDERSTORMS OVER WESTERN AND CENTRAL PENNSYLVANIA. THE LEADING EDGE OF THIS AREA EXTENDED INTO WESTERN BRADFORD AND EASTERN LYCOMING COUNTIES IN NORTHCENTRAL PENNSYLVANIA. THE STRONGEST THUNDERSTORMS WERE IN CENTRE AND BLAIR COUNTIESf. PERSONS IN THE PATH OF THESE STORMS SHOULD TAKE COVER IF THREATENING WEATHER APPROACHES. INTERIOR LOCATIONS OF A STURDY BUILDING PROVIDE THE BEST PROTECTION AGAINST SEVERE THUNDERSTORMS. PMG/HM
Special weather statement, Apr 16, 6:20 AM EDT, 3 hours 4 minutes before
PAZ007-008-014-161100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 620 AM EDT FRI APR 16 1993 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR NORTHCENTRAL PENNSYLVANIA UNTIL 700 AM... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR ALL OF NORTHCENTRAL PENNSYLVANIA UNTIL 700 AM. THIS INCLUDES TIOGA... BRADFORD... CLINTON...LYCOMING AND SULLIVAN COUNTIES. A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. SEVERE THUNDERSTORMS CAN CONTAIN STRONG DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL AND DAMAGING LIGHTNING. AT 610 AM EDT SHOWED AN AREA OF SHOWERS AND LOCALLY STRONG THUNDERSTORMS OVER WESTERN AND CENTRAL PENNSYLVANIA. THE LEADING EDGE OF THIS AREA EXTENDED INTO CENTRAL BRADFORD AND WESTERN SULLIVAN COUNTIES IN NORTHCENTRAL PENNSYLVANIA. THE STRONGEST THUNDERSTORMS WERE IN A THIN LINE EXTENDING FROM RENOVA IN CLINTON COUNTY TO STATE COLLEGE...HUNTINGDON AND EVERETT IN BEDFORD COUNTY. THE THUNDERSTORMS WERE MOVING NORTHEAST ABOUT 40 MPH. PERSONS IN THE PATH OF THESE STORMS SHOULD TAKE COVER IF THREATENING WEATHER APPROACHES. INTERIOR LOCATIONS OF A STURDY BUILDING PROVIDE THE BEST PROTECTION AGAINST SEVERE THUNDERSTORMS. PMG/HM
Special weather statement, Apr 16, 8:02 AM EDT, 1 hour 22 minutes before
PAZ006-008-009-013-014-161400- FLOOD WATCH STATEMENT ...ISSUED UNDER PHLSPSHAR FOR PEMA... NATIONAL WEATHER SERVICE HARRISBURG PA 800 AM EDT FRI APR 16 1993 ...A FLOOD WATCH IS IN EFFECT FOR THE SOUTH CENTRAL MOUNTAINS THIS MORNING... AND FOR THE LOWER AND MIDDLE SUSQUEHANNA VALLEY TODAY... ...FLASH FLOOD WARNINGS ARE IN EFFECT FOR CENTRE AND HUNTINGDON COUNTIES UNTIL 10 AM THIS MORNING... THE SEVERE THUNDERSTORMS WHICH MOVED THROUGH WESTERN PENNSYLVANIA EARLY THIS MORNING HAVE STALLED OUT IN THE CENTRAL MOUNTAINS. THE POTENTIAL FOR SEVERE WEATHER HAS DECREASED FOR THE TIME BEING...BUT THE POTENTIAL FOR FLOODING HAS INCREASED DUE TO HEAVY RAIN THIS MORNING. RAINFALL AMOUNTS OF 1 TO 2 INCHES HAVE FALLEN ACROSS THE SOUTH CENTRAL AND LAUREL MOUNTAINS THIS MORNING AND FLOODING HAS BEEN OBSERVED IN CENTRE...HUNTINGDON...CLEARFIELD AND BLAIR COUNTIES. A RAIN GAUGE AT UNIONVILLE IN CENTRE COUNTY HAS RECORDED 2.28 INCHES OF RAIN SINCE IT BEGAN FALLING EARLY THIS MORNING. AT 800 AM HARRISBURG RADAR WAS SHOWING AN AREA OF MODERATE TO HEAVY RAIN ALONG WITH SOME EMBEDDED THUNDERSTORMS FROM CENTRE AND MIFFLIN COUNTIES DOWN TO BEDFORD AND FULTON COUNTIES...THEN SOUTH INTO NORTHERN VIRGINIA. INDIVIDUAL CELLS WERE MOVING NORTHEAST AT 40 TO 50 MPH...WHILE THE AREA WAS SLIDING EAST AT ONLY 10 TO 20 MPH. RAIN WILL CONTINUE HEAVY AT TIMES THROUGHOUT THE MORNING ACROSS THE SOUTH CENTRAL MOUNTAINS...AND WILL GRADUALLY SPREAD ACROSS THE LOWER AND MIDDLE SUSQUEHANNA VALLEY BETWEEN 8 AND 10 AM. ADDITIONAL FLOODING IS LIKELY IN THE MOUNTAINS...AND IS A POSSIBILITY IN THE SUSQUEHANNA VALLEY. DO NOT ATTEMPT TO DRIVE OVER A FLOODED ROAD...YOU COULD BE STRANDED OR TRAPPED. THE DEPTH OF WATER IS NOT ALWAYS OBVIOUS. THUNDERSTORMS ARE LIKELY THROUGHOUT THE REMAINDER OF THE DAY...AND THE POTENTIAL FOR SEVERE WEATHER AND FLOODING EXISTS. STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL TV AND RADIO STATIONS FOR THE LATEST STATEMENTS AND POSSIBLE WARNINGS. RODGERS
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 6:33 AM EDT | Flash Flood Warning | CTP | Centre | 3 hr |
| Apr 16, 6:54 AM EDT | Flash Flood Warning | CTP | Huntingdon | 3 hr |
| Apr 16, 9:19 AM EDT | Severe Thunderstorm Warning | CTP | Cumberland | 56 min |
| Apr 16, 9:30 AM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 60 min |
| Apr 16, 9:45 AM EDT | Severe Thunderstorm Warning | CTP | Union | 60 min |
| Apr 16, 9:59 AM EDT | Severe Thunderstorm Warning | CTP | Bradford | 31 min |
| Apr 16, 10:15 AM EDT | Flash Flood Warning | CTP | Clinton | 4 hr |
| Apr 16, 10:15 AM EDT | Flash Flood Warning | CTP | Bradford | 4 hr |
| Apr 16, 11:25 AM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, York | 6 hr |
| Apr 16, 12:25 PM EDT | Flash Flood Warning | CTP | Tioga | 110 min |
| Apr 16, 1:56 PM EDT | Flash Flood Warning | CTP | Bradford, Clinton, Lycoming, Sullivan, Tioga | 4 hr |
| Apr 16, 3:55 PM EDT | Flash Flood Warning | CTP | Lancaster | 5 hr |
| Apr 16, 4:14 PM EDT | Flash Flood Warning | CTP | Franklin, Huntingdon | 5 hr |
| Apr 16, 5:15 PM EDT | Flash Flood Warning | CTP | Bradford, Clinton, Lycoming | 5 hr |
| Apr 16, 7:48 PM EDT | Severe Thunderstorm Warning | CTP | Fulton | 57 min |
Nearby
Flash Flood Warnings in Pennsylvania, 1993Every flash flood warning in 1993
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.