Alert archive / Pennsylvania / Flash Flood Warnings in 1999
Flash Flood Warning 2, NWS State College, PA
NWS State College, PA issued this flash flood warning at Jan 18, 1999, 1:25 PM EST for Lancaster County, Pennsylvania. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jan 18, 1999, 1:25 PM EST (18:25 UTC)
- Expired
- Jan 18, 1999, 5:05 PM EST
- In force
- 4 hr
- Issued by
- NWS State College, PA
- Area
- Whole counties
County Lancaster County, PA
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.4 hours before the alert went out and 157 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
- 408 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 601 m²/s²
- 0-3 km storm-relative helicity
- 602 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCTP 181826 FFWCTP PAC071-182205- BULLETIN - EAS ACTIVATION REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE STATE COLLEGE PA 125 PM EST MON JAN 18 1999 THE NATIONAL WEATHER SERVICE HAS CONTINUED A * FLOOD WARNING FOR... LANCASTER COUNTY IN SOUTHEASTERN PENNSYLVANIA. * UNTIL 505 PM EST. * AT 120 PM...DOPPLER RADAR SHOWED RAIN ACROSS THE COUNTY. THIS RAIN WILL CONTINUE INTO THE EARLY EVENING...AND MAY BECOME HEAVY AT TIMES. * MANY SMALL STREAMS ARE ALREADY OUT OF THEIR BANKS OR ARE RISING RAPIDLY. COUNTY EMERGENCY MANAGEMENT OFFICIALS REPORT NUMEROUS ROAD CLOSINGS DUE TO FLOOD WATERS. ADDITIONAL RAIN THIS AFTERNOON WILL ONLY AGGREVATE EXISTING FLOODING PROBLEMS. RESIDENTS OF LANCASTERH COUNTY SHOULD USE CAUTION WHILE TRAVELING TODAY...AS SOME ROADS AND LOW-LYING AREAS MAY BE COVERED BY FLOODWATERS. .END/ JUNG &
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.
NWS State College, PA wrote its last area forecast discussion before this flash flood warning went out at Jan 18, 10:30 AM EST, 2 hours 55 minutes earlier.
Area forecast discussion, Jan 18, 10:30 AM EST, 2 hours 55 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 1030 AM EST MON JAN 18 1999 ...WORK ZONES OUT AT 930 AS PHLADMCTP... ...ZONES OUT BY 11 AM AS PHLZFPCTP... UPPER LO...SEEN IN THE SATELLITE IMAGERY NEAR SOUTHERN LK MICHIGAN...WILL PROGRESS NE TODAY. DARKENING IN WV IMAGERY OVER OHIO VALLEY REVEALING THE VORT MAX THAT IS PROGGED TO MOVE INTO PA LATE TODAY. REGIONAL RADAR LOOP SHOWING AN AREA OF MODERATE TO HEAVY RAIN DEVELOPING ACROSS EASTERN OHIO IN ADVANCE OF THE SFC COLD FRONT. RECENT LIGHTNING DATA SUGGESTING THAT THUNDER WILL BE CONFINED TO EXTREME SE PA...WHERE INFLUX OF LL MOISTURE IS THE GREATEST. WILL KEEP THE FFA GOING THROUGH THE AFTN BECAUSE MINOR FLOODING STILL SEEMS LIKELY AS PRE-FRONTAL RAIN BAND MOVES THROUGH THIS AFTN. IN FACT...SOME STREAMS IN LANCASTER CO ALREADY FLOODING IN RESPONSE TO RAINS OVERNIGHT. ALSO...FLASH FLOOD THREAT EXISTS AS A RESULT OF POSSIBLE ICE JAMS ALONG SMALLER RIVERS AND STREAMS. HAVE ADDED THE CHANCE OF SNOW SHOWERS EXTREME NW FOR LATE THIS AFTN GIVEN LATEST ETA SOUNDINGS. .CTP...FLASH FLOOD WATCH THROUGH THIS AFTERNOON SOUTHERN HALF OF CENTRAL PA. WILL RE-ISSUE PHLSPSCTP FOR CONVECTIVE OUTLOOK IN THE LOWER SUSQ VALL. FITZGERALD
In the hours before
Special weather statement, Jan 18, 11:06 AM EST, 2 hours 19 minutes before
PAZ036-056-057-059-063>066-182115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 1106 AM EST MON JAN 18 1999 ...SLIGHT RISK OF DAMAGING THUNDERSTORM WINDS THIS AFTERNOON... A COLD FRONT WILL SWEEP EAST ACROSS PENNSYLVANIA THIS AFTERNOON. AS THE FRONT MOVES THROUGH...IT WILL BRING A PERIOD OF RAIN...ALONG WITH WIDELY SCATTERED THUNDERSTORMS. WINDS JUST ABOVE THE SURFACE ARE VERY STRONG FROM THE SOUTHWEST. THEREFORE...ANY THUNDERSTORMS THAT FORM WILL BRIEFLY BE CAPABLE OF CAUSING THESE STRONG WINDS TO DECEND TO THE GROUND. SOME GUSTS WILL LIKELY EXCEED 40 MPH AND COULD BE POTENTIALLY DAMAGING. ANYONE WITH PROPERTY CONCERNS THAT ARE VULNERABLE TO HIGH WINDS SHOULD MONITOR THIS SITUATION CLOSELY. .END/ YOU CAN FIND INFORMATION ON THE FLOOD POTENTIAL WITH THIS SYSTEM IN THE FLASH FLOOD WATCH (PHLFFACTP) ISSUED THIS MORNING. ADDITIONAL WEATHER INFORMATION FOR CENTRAL PENNSYLVANIA CAN BE FOUND AT THE STATE COLLEGE NATIONAL WEATHER SERVICE WORLD WIDE WEB SITE. THE ADDRESS IS: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE) FITZGERALD
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 18, 10:33 AM EST | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Jan 18, 1:33 PM EST | Severe Thunderstorm Warning | CTP | Centre, Huntingdon, Mifflin | 77 min |
| Jan 18, 1:33 PM EST | Severe Thunderstorm Warning | CTP | Bedford, Franklin, Fulton | 77 min |
| Jan 18, 1:33 PM EST | Severe Thunderstorm Warning | CTP | Blair | 77 min |
| Jan 18, 2:19 PM EST | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Juniata, Northumberland, Perry, Snyder | 61 min |
| Jan 18, 2:19 PM EST | Severe Thunderstorm Warning | CTP | Adams, York | 61 min |
| Jan 18, 2:19 PM EST | Severe Thunderstorm Warning | CTP | Union | 61 min |
| Jan 18, 2:28 PM EST | Severe Thunderstorm Warning | CTP | Lycoming | 47 min |
| Jan 18, 3:03 PM EST | Flash Flood Warning | CTP | Columbia, Lycoming, Montour, Northumberland, Sullivan | 4 hr |
| Jan 18, 3:03 PM EST | Flash Flood Warning | CTP | Lebanon, Schuylkill | 4 hr |
| Jan 18, 4:05 PM EST | Flash Flood Warning | CTP | Lancaster | 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.