Alert archive / Pennsylvania / Flash Flood Warnings in 1999
Flash Flood Warning 59, NWS State College, PA
NWS State College, PA issued this flash flood warning at Sep 9, 1999, 8:58 PM EDT for Lancaster County, York County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Sep 9, 1999, 8:58 PM EDT (00:58 UTC)
- Expired
- Sep 10, 1999, 12:00 AM EDT
- In force
- 3 hr
- Issued by
- NWS State College, PA
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Lancaster County, PA, York County, PA
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 1.0 hours before the alert went out and 245 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
- 534 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 790 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KCTP 100101
FFWCTP
PAC071-133-100400-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
858 PM EDT THU SEP 9 1999
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
YORK COUNTY.
LANCASTER COUNTY.
* UNTIL MIDNIGHT.
* AT 855 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
AN AREA OF SHOWERS AND THUNDERSTORM WITH VERY HEAVY RAINFALL OVER
YORK AND LANCASTER COUNTIES.
SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING ALONG SMALLER STREAMS AND CREEKS AS WELL AS LOW LYING AREAS.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED. MOVE TO
HIGHER GROUND.
.END/ ONDREJIK
LAT...LON 3997 7680 3977 7674 3976 7611 4015 7596
4029 7616What 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.
NWS State College, PA wrote its last area forecast discussion before this flash flood warning went out at Sep 9, 8:56 PM EDT, 2 minutes earlier.
Area forecast discussion, Sep 9, 8:56 PM EDT, 2 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 856 PM EDT THU SEP 9 1999 I HAVE DECIDED...AT THE LAST MINUTE...TO UP POPS IN THE MID-UPR SUSQ...WHICH MESHES WITH BGM THINKING FROM THEIR ADM. BUSY EVENING IN CENTRAL PA. MINISUPERCELL MOVED THRU NW PA ERLIER WHILE HVY RAINS FIRED UP IN THE LOER SUSQ. MEDIA REPORTS OF 2 INCHES IN 20 MINUTES IN WESTERN LANCASTER COUNTY A COUPLE HOURS AGO. RADAR LOOP SHOWING THUNDER HAS DIMINISHED WITH STEADY...BUT LESS HEAVY...STRATIFORM RAIN CONTINUING. WEST ZONES WILL DRY AND CLEAR OUT OVERNIGHT WITH MAIN CONCERN BEING FAR EASTERN ZONES. MODEL SOUNDINGS INDICATE DEEP MOIST ATM IN SE PA OVERNIGHT. THIS...COMBINED WITH LIFT PROVIDED BY UPR LVL JET MAX SWINGING THRU...SHUD KEEP THE WET MACHINE GOING INTO 12Z FRI FOR MY SE ZONES. QUESTION IS HOW FAR NORTH THE STEADY RAIN MAKES IT. LATEST REGIONAL RADAR LOOP SHOWING A GOOD BATCH OF RAIN CROSSING MD-PA LINE INTO SOUTH CENTRAL PA...WITH SHOWERS FILLING IN ON AN AXIS STRETCHING UP TO UNV. THIS AREA WILL MOVE EAST INTO MID/UPR SUSQ IN THE NEXT COUPLE HOURS...THEREFORE THE CHANGE NOTED ABOVE. EAST ZONES DRY OUT BY NOON FRI. COOLER MORE TRANQUIL WEATHER OVER THE WEEKEND. THE FLOYD FLOOD NEXT WEEK?? THIS IS TURNING IN TO ONE OF THE WETTER DROUGHTS WEVE HAD IN A WHILE. .CTP...NONE. OSTUNO
In the hours before
Special weather statement, Sep 9, 3:55 PM EDT, 5 hours 3 minutes before
PAZ028-036-049>053-056>059-063>066-100157- SEVERE WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE STATE COLLEGE PA 355 PM EDT THU SEP 9 1999 ...ISOLATED SEVERE THUNDERSTORMS WITH VERY HEAVY DOWNPOURS ARE POSSIBLE ACROSS THE LOWER AND MID-SUSQUEHANNA VALLEY TONIGHT... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND AHEAD OF A COLD FRONT MOVING SLOWLY EAST ACROSS CENTRAL PENNSYLVANIA THIS TONIGHT. A FEW THUNDERSTORMS COULD CONTAIN STRONG GUSTY WINDS OR HAIL. THESE THUNDERSTORMS COULD ALSO CONTAIN VERY HEAVY RAIN. HEAVY DOWNPOURS COULD CAUSE LOCALIZED FLOODING IN URBANIZED AREAS WHERE STORMS PERSIST FOR OVER AN HOUR. THE BEST CHANCE FOR ANY SEVERE WEATHER WILL BE THIS EVENING...BUT THE CHANCE OF THUNDERSTORMS WILL CONTINUE THROUGH THE NIGHT. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE LOCAL SOURCE OF WEATHER INFORMATION...FOR THE LATEST FORECASTS AND STATEMENTS ON TONIGHTS THUNDERSTORMS. .END/ MSE ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE NATIONAL WEATHER SERVICE WEB-SITE AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
Special weather statement, Sep 9, 3:55 PM EDT, 5 hours 3 minutes before
PAZ028-036-049>053-056>059-063>066-100157- SEVERE WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE STATE COLLEGE PA 355 PM EDT THU SEP 9 1999 ...ISOLATED SEVERE THUNDERSTORMS WITH VERY HEAVY DOWNPOURS ARE POSSIBLE ACROSS THE LOWER AND MID-SUSQUEHANNA VALLEY TONIGHT... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND AHEAD OF A COLD FRONT MOVING SLOWLY EAST ACROSS CENTRAL PENNSYLVANIA THIS TONIGHT. A FEW THUNDERSTORMS COULD CONTAIN STRONG GUSTY WINDS OR HAIL. THESE THUNDERSTORMS COULD ALSO CONTAIN VERY HEAVY RAIN. HEAVY DOWNPOURS COULD CAUSE LOCALIZED FLOODING IN URBANIZED AREAS WHERE STORMS PERSIST FOR OVER AN HOUR. THE BEST CHANCE FOR ANY SEVERE WEATHER WILL BE THIS EVENING...BUT THE CHANCE OF THUNDERSTORMS WILL CONTINUE THROUGH THE NIGHT. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE LOCAL SOURCE OF WEATHER INFORMATION...FOR THE LATEST FORECASTS AND STATEMENTS ON TONIGHTS THUNDERSTORMS. .END/ MSE ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE NATIONAL WEATHER SERVICE WEB-SITE AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
Special weather statement, Sep 9, 3:57 PM EDT, 5 hours 1 minute before
PAZ028-036-049>053-056>059-063>066-100158- SEVERE WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE STATE COLLEGE PA 357 PM EDT THU SEP 9 1999 ...ISOLATED SEVERE THUNDERSTORMS WITH VERY HEAVY DOWNPOURS ARE POSSIBLE ACROSS THE LOWER AND MID-SUSQUEHANNA VALLEY TONIGHT... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND AHEAD OF A COLD FRONT MOVING SLOWLY EAST ACROSS CENTRAL PENNSYLVANIA TONIGHT. A FEW THUNDERSTORMS COULD CONTAIN STRONG GUSTY WINDS OR HAIL. THESE THUNDERSTORMS COULD ALSO CONTAIN VERY HEAVY RAIN. HEAVY DOWNPOURS COULD CAUSE LOCALIZED FLOODING IN URBANIZED AREAS WHERE STORMS PERSIST FOR OVER AN HOUR. THE BEST CHANCE FOR ANY SEVERE WEATHER WILL BE THIS EVENING...BUT THE CHANCE OF THUNDERSTORMS WILL CONTINUE THROUGH THE NIGHT. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE LOCAL SOURCE OF WEATHER INFORMATION...FOR THE LATEST FORECASTS AND STATEMENTS ON TONIGHTS THUNDERSTORMS. .END/ MSE ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE NATIONAL WEATHER SERVICE WEB-SITE AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
Special weather statement, Sep 9, 3:57 PM EDT, 5 hours 1 minute before
PAZ028-036-049>053-056>059-063>066-100158- SEVERE WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE STATE COLLEGE PA 357 PM EDT THU SEP 9 1999 ...ISOLATED SEVERE THUNDERSTORMS WITH VERY HEAVY DOWNPOURS ARE POSSIBLE ACROSS THE LOWER AND MID-SUSQUEHANNA VALLEY TONIGHT... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND AHEAD OF A COLD FRONT MOVING SLOWLY EAST ACROSS CENTRAL PENNSYLVANIA TONIGHT. A FEW THUNDERSTORMS COULD CONTAIN STRONG GUSTY WINDS OR HAIL. THESE THUNDERSTORMS COULD ALSO CONTAIN VERY HEAVY RAIN. HEAVY DOWNPOURS COULD CAUSE LOCALIZED FLOODING IN URBANIZED AREAS WHERE STORMS PERSIST FOR OVER AN HOUR. THE BEST CHANCE FOR ANY SEVERE WEATHER WILL BE THIS EVENING...BUT THE CHANCE OF THUNDERSTORMS WILL CONTINUE THROUGH THE NIGHT. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE LOCAL SOURCE OF WEATHER INFORMATION...FOR THE LATEST FORECASTS AND STATEMENTS ON TONIGHTS THUNDERSTORMS. .END/ MSE ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE NATIONAL WEATHER SERVICE WEB-SITE AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
Special weather statement, Sep 9, 4:10 PM EDT, 4 hours 48 minutes before
PAZ004>006-010-011-017-100210- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 410 PM EDT THU SEP 9 1999 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING ACROSS PORTIONS OF NORTH CENTRAL PENNSYLVNAIA... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND AHEAD OF A COLD FRONT MOVING SLOWLY EAST ACROSS WESTERN AND CENTRAL PENNSYLVANIA THIS EVENING. A FEW ISOLATED THUNDERSTORMS COULD CONTAIN STRONG DAMAGING WINDS OR LARGE HAIL. THE THUNDERSTORMS WILL BE EAST OF THE AREA BY LATE THIS EVENING. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE LOCAL SOURCE OF WEATHER INFORMATION...FOR THE LATEST FORECASTS AND STATEMENTS ON TONIGHTS THUNDERSTORMS. .END/ MSE ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE NATIONAL WEATHER SERVICE WEB-SITE AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
Special weather statement, Sep 9, 4:10 PM EDT, 4 hours 48 minutes before
PAZ004>006-010-011-017-100210- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 410 PM EDT THU SEP 9 1999 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING ACROSS PORTIONS OF NORTH CENTRAL PENNSYLVNAIA... SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND AHEAD OF A COLD FRONT MOVING SLOWLY EAST ACROSS WESTERN AND CENTRAL PENNSYLVANIA THIS EVENING. A FEW ISOLATED THUNDERSTORMS COULD CONTAIN STRONG DAMAGING WINDS OR LARGE HAIL. THE THUNDERSTORMS WILL BE EAST OF THE AREA BY LATE THIS EVENING. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE LOCAL SOURCE OF WEATHER INFORMATION...FOR THE LATEST FORECASTS AND STATEMENTS ON TONIGHTS THUNDERSTORMS. .END/ MSE ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE STATE COLLEGE NATIONAL WEATHER SERVICE WEB-SITE AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 10:45 PM EDT | Flash Flood Warning | CTP | Union | 3 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 1999Every flash flood warning in 1999
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.