Alert archive / Pennsylvania / Flash Flood Warnings in 1993
Flash Flood Warning 41, NWS State College, PA
NWS State College, PA issued this flash flood warning at Aug 11, 1993, 7:50 PM EDT for Adams County, York County, Pennsylvania. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Aug 11, 1993, 7:50 PM EDT (23:50 UTC)
- Expired
- Aug 11, 1993, 8:45 PM EDT
- In force
- 55 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Adams County, PA, York County, PA
The radar
The Sterling radar (KLWX), 111 km from the middle of the area, began a volume at 23:52 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, 11.8 hours before the alert went out and 111 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
- NaN m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Aug 11, 6:55 PM EDT, 55 minutes before
PAZ006-008-009-013-014-120100- SEVERE WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HARRISBURG PA 655 PM EDT WED AUG 11 1993 ...SEVERE WEATHER INFORMATION... A SEVERE THUNDERSTORM WARNING CONTINUES IN EFFECT UNTIL 700 PM FOR ADAMS COUNTY. AT 650 PM A SPOTTER REPORTED DIME SIZED HAIL 5 MILES NORTHWEST OF EAST BERLIN IN NORTHEAST ADAMS COUNTY. ...WATCH INFORMATION... A FLASH FLOOD WATCH IS IN EFFECT FOR SOUTH CENTRAL PENNSYLVANIA AND THE SOUTH CENTRAL MOUNTAINS. THE FOLLOWING COUNTIES ARE INCLUDED IN THE WATCH: BEDFORD...BLAIR...CENTRE...MIFFLIN...JUNIATA...FULTON...FRANKLIN...AND HUNTINGDON. ...RADAR INFORMATION... AT 630 PM HARRISBURG RADAR SHOWED AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMSACROSS CENTRAL AND EASTERN PENNSYLVANIA...WESTERN MARYLAND...NORTHEAST WEST VIRGINIA...AND NORTHERN VIRGINIA. THE STRONGEST STORM WAS OVER NORTHEAST ADAMS COUNTY. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST-SOUTHEAST AT 15 MILE AN HOUR. ...SAFETY INFORMATION... A FLASH FLOOD WATCH MEANS FLOODING IS A POSSIBILITY...NOT A CERTAINTY. BE PREPARED FOR QUICK ACTION IS A WARNING IS ISSUED OR FLOODING IS OBSERVED. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY. WHEN A THUNDERSTORM THREATENS...TAKE COVER IMMEDIATELY. MATUSIEWICZ
Special weather statement, Aug 11, 6:58 PM EDT, 52 minutes before
PAZ006-008-009-013-014-120100- SEVERE WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HARRISBURG PA 655 PM EDT WED AUG 11 1993 ...SEVERE WEATHER INFORMATION... A SEVERE THUNDERSTORM WARNING CONTINUES IN EFFECT UNTIL 700 PM FOR ADAMS COUNTY. AT 650 PM A SPOTTER REPORTED DIME SIZED HAIL 5 MILES NORTHWEST OF EAST BERLIN IN NORTHEAST ADAMS COUNTY. ...WATCH INFORMATION... A FLASH FLOOD WATCH IS IN EFFECT FOR SOUTH CENTRAL PENNSYLVANIA AND THE SOUTH CENTRAL MOUNTAINS. THE FOLLOWING COUNTIES ARE INCLUDED IN THE WATCH: BEDFORD...BLAIR...CENTRE...MIFFLIN...JUNIATA...FULTON...FRANKLIN...AND HUNTINGDON. ...RADAR INFORMATION... AT 630 PM HARRISBURG RADAR SHOWED AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMSACROSS CENTRAL AND EASTERN PENNSYLVANIA...WESTERN MARYLAND...NORTHEAST WEST VIRGINIA...AND NORTHERN VIRGINIA. THE STRONGEST STORM WAS OVER NORTHEAST ADAMS COUNTY. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST-SOUTHEAST AT 15 MILE AN HOUR. ...SAFETY INFORMATION... A FLASH FLOOD WATCH MEANS FLOODING IS A POSSIBILITY...NOT A CERTAINTY. BE PREPARED FOR QUICK ACTION IS A WARNING IS ISSUED OR FLOODING IS OBSERVED. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY. WHEN A THUNDERSTORM THREATENS...TAKE COVER IMMEDIATELY. MATUSIEWICZ
Special weather statement, Aug 11, 7:10 PM EDT, 40 minutes before
PAZ007-008-014-120030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 710 PM EDT WED AUG 11 1993 ...THUNDERSTORMS MOVING THROUGH NORTHCENTRAL PENNSYLVANIA... ...RADAR INFORMATION... AT 710 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM ELMIRA NEW YORK TO LAPORTE AND BENTON...THEN SOUTHWEST TO SHAMOKIN AND HARRISBURG. THE STRONGEST THUNDERSTORMS WERE BETWEEN SONESTOWN HUGHESVILLE...BLOOMSBURG AND BERWICK. OTHER STRONG THUNDERSTORMS WERE BETWEEN LEWISBURG...SUNBURY AND REBUCK IN THE MIDDLE SUSQUEHANNA VALLEY. THE SHOWERS AND THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT AROUND 15 MPH. A SPOTTER FROM THE WILLIAMSPORT AREA REPORTED PEA SIZE HAIL FROM THESE THUNDERSTORMS. ALSO...OVER ONE INCH OF RAIN /1.12/ FELL HERE AT THE WILLIAMSPORT LYCOMING COUNTY AIRPORT IN ONE-HALF AN HOUR. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE MOVING ACROSS EASTERN TIOGA AND LYCOMING COUNTIES THROUGH 800 PM EDT...AND WILL BE MOVING THROUGH BRADFORD AND SULLIVAN COUNTIES DURING THE NEXT 2 TO 3 HOURS. THE THUNDERSTORMS WILL CONTAIN HEAVY RAINS...AND POSSIBLY SOME HAIL. ALL THUNDERSTORMS CONTAIN DEADLY LIGHTNING. ...SAFETY INFORMATION... IF THREATENING WEATHER APPROACHES MOVE INDOORS. STAY AWAY FROM WINDOWS AND DO NOT USE ELECTRICAL APPLIANCES WHILE THUNDERSTORMS ARE IN THE AREA. BE CAREFUL IF DRIVING IN HEAVY DOWNPOURS...THE RAIN CAN REDUCE VISIBILITIES TO NEAR ZERO AT TIMES. SLOW DOWN AND USE YOUR HEADLIGHTS IN ANY DOWNPOURS. TG
Special weather statement, Aug 11, 7:10 PM EDT, 40 minutes before
PAZ007-008-014-120030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 710 PM EDT WED AUG 11 1993 ...THUNDERSTORMS MOVING THROUGH NORTHCENTRAL PENNSYLVANIA... ...RADAR INFORMATION... AT 710 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM ELMIRA NEW YORK TO LAPORTE AND BENTON...THEN SOUTHWEST TO SHAMOKIN AND HARRISBURG. THE STRONGEST THUNDERSTORMS WERE BETWEEN SONESTOWN HUGHESVILLE...BLOOMSBURG AND BERWICK. OTHER STRONG THUNDERSTORMS WERE BETWEEN LEWISBURG...SUNBURY AND REBUCK IN THE MIDDLE SUSQUEHANNA VALLEY. THE SHOWERS AND THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT AROUND 15 MPH. A SPOTTER FROM THE WILLIAMSPORT AREA REPORTED PEA SIZE HAIL FROM THESE THUNDERSTORMS. ALSO...OVER ONE INCH OF RAIN /1.12/ FELL HERE AT THE WILLIAMSPORT LYCOMING COUNTY AIRPORT IN ONE-HALF AN HOUR. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE MOVING ACROSS EASTERN TIOGA AND LYCOMING COUNTIES THROUGH 800 PM EDT...AND WILL BE MOVING THROUGH BRADFORD AND SULLIVAN COUNTIES DURING THE NEXT 2 TO 3 HOURS. THE THUNDERSTORMS WILL CONTAIN HEAVY RAINS...AND POSSIBLY SOME HAIL. ALL THUNDERSTORMS CONTAIN DEADLY LIGHTNING. ...SAFETY INFORMATION... IF THREATENING WEATHER APPROACHES MOVE INDOORS. STAY AWAY FROM WINDOWS AND DO NOT USE ELECTRICAL APPLIANCES WHILE THUNDERSTORMS ARE IN THE AREA. BE CAREFUL IF DRIVING IN HEAVY DOWNPOURS...THE RAIN CAN REDUCE VISIBILITIES TO NEAR ZERO AT TIMES. SLOW DOWN AND USE YOUR HEADLIGHTS IN ANY DOWNPOURS. TG
Special weather statement, Aug 11, 7:40 PM EDT, 10 minutes before
PAZ007-008-014-120100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 740 PM EDT WED AUG 11 1993 ...THUNDERSTORMS MOVING THROUGH NORTHCENTRAL PENNSYLVANIA AND THE MIDDLE SUSQUEHANNA VALLEY... ...RADAR INFORMATION... AT 740 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM BENTLEY CREEK IN BRADFORD COUNTY TO LAPORTE AND BERWICK...THEN SOUTHWEST TO MOUNT CARMEL AND HERSHEY. THE STRONGEST THUNDERSTORMS WERE BETWEEN BENTON...BLOOMSBURG AND SUNBURY. THE SHOWERS AND THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT AROUND 15 MPH. A SPOTTER FROM THE WILLIAMSPORT AREA REPORTED PEA SIZE HAIL FROM THESE THUNDERSTORMS. ALSO...OVER ONE INCH OF RAIN /1.12/ FELL HERE AT THE WILLIAMSPORT LYCOMING COUNTY AIRPORT IN ONE-HALF AN HOUR. THE SHOWERS AND THUNDERSTORMS WILL MOVE EAST OF TIOGA AND LYCOMING COUNTIES BY 830 PM EDT...AND WILL BE MOVING THROUGH BRADFORD AND SULLIVAN COUNTIES DURING THE NEXT 2 TO 3 HOURS. THE THUNDERSTORMS WILL CONTAIN HEAVY RAINS...AND POSSIBLY SOME HAIL. ALL THUNDERSTORMS CONTAIN DEADLY LIGHTNING. ...SAFETY INFORMATION... IF THREATENING WEATHER APPROACHES MOVE INDOORS. STAY AWAY FROM WINDOWS AND DO NOT USE ELECTRICAL APPLIANCES WHILE THUNDERSTORMS ARE IN THE AREA. BE CAREFUL IF DRIVING IN HEAVY DOWNPOURS...THE RAIN CAN REDUCE VISIBILITIES TO NEAR ZERO AT OWN AND USE YOUR HEADLIGHTS IN ANY DOWNPOURS. TG
Special weather statement, Aug 11, 7:40 PM EDT, 10 minutes before
PAZ007-008-014-120100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 740 PM EDT WED AUG 11 1993 ...THUNDERSTORMS MOVING THROUGH NORTHCENTRAL PENNSYLVANIA AND THE MIDDLE SUSQUEHANNA VALLEY... ...RADAR INFORMATION... AT 740 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM BENTLEY CREEK IN BRADFORD COUNTY TO LAPORTE AND BERWICK...THEN SOUTHWEST TO MOUNT CARMEL AND HERSHEY. THE STRONGEST THUNDERSTORMS WERE BETWEEN BENTON...BLOOMSBURG AND SUNBURY. THE SHOWERS AND THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT AROUND 15 MPH. A SPOTTER FROM THE WILLIAMSPORT AREA REPORTED PEA SIZE HAIL FROM THESE THUNDERSTORMS. ALSO...OVER ONE INCH OF RAIN /1.12/ FELL HERE AT THE WILLIAMSPORT LYCOMING COUNTY AIRPORT IN ONE-HALF AN HOUR. THE SHOWERS AND THUNDERSTORMS WILL MOVE EAST OF TIOGA AND LYCOMING COUNTIES BY 830 PM EDT...AND WILL BE MOVING THROUGH BRADFORD AND SULLIVAN COUNTIES DURING THE NEXT 2 TO 3 HOURS. THE THUNDERSTORMS WILL CONTAIN HEAVY RAINS...AND POSSIBLY SOME HAIL. ALL THUNDERSTORMS CONTAIN DEADLY LIGHTNING. ...SAFETY INFORMATION... IF THREATENING WEATHER APPROACHES MOVE INDOORS. STAY AWAY FROM WINDOWS AND DO NOT USE ELECTRICAL APPLIANCES WHILE THUNDERSTORMS ARE IN THE AREA. BE CAREFUL IF DRIVING IN HEAVY DOWNPOURS...THE RAIN CAN REDUCE VISIBILITIES TO NEAR ZERO AT OWN AND USE YOUR HEADLIGHTS IN ANY DOWNPOURS. TG
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 6:27 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 33 min |
| Aug 11, 7:13 PM EDT | Flash Flood Warning | CTP | Adams, York | 32 min |
| Aug 11, 7:13 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 32 min |
| Aug 11, 7:50 PM EDT | Severe Thunderstorm Warning | CTP | Adams, York | 55 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.