Alert archive / Pennsylvania / Flash Flood Warnings in 1997
Flash Flood Warning 21, NWS State College, PA
NWS State College, PA issued this flash flood warning at Sep 11, 1997, 12:20 AM EDT for Adams 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
- Sep 11, 1997, 12:20 AM EDT (04:20 UTC)
- Expired
- Sep 11, 1997, 4:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS State College, PA
- Area
- Whole counties
County Adams County, PA
The radar
The Sterling radar (KLWX), 102 km from the middle of the area, began a volume at 04:21 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 00:00Z, 4.3 hours before the alert went out and 104 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
- -21 J/kg
- Mixed-layer LCL
- 816 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCTP 110420 FFWCTP PAC001-110830- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE STATE COLLEGE PA 1220 AM EDT THU SEP 11 1997 THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 430 AM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTH CENTRAL PENNSYLVANIA ...ADAMS COUNTY AT 1215 AM EDT...DOPPLER RADAR FROM STATE COLLEGE SHOWED THAT ANOTHER BATCH OF VERY HEAVY RAINFALL WAS MOVING INTO ADAMS COUNTY FROM MARYLAND AND NORTHERN VIRGINIA. RAINFALL SINCE YESTERDAY MORNING HAS TOTALED OVER 4 INCHES IN PARTS OF ADAMS COUNTY. RUNOFF FROM THE RECENT RAINFALL AND ADDITIONAL HEAVY RAINFALL OVERNIGHT WILL LIKELY CAUSE FLOODING OF STREAMS AND CREEKS IN ADAMS COUNTY DURING THE EARLY MORNING HOURS. IN ADDITION... URBAN AND POOR DRAINAGE AREAS WILL BE VERY SUSCEPTIBLE TO FLOODING PROBLEMS THROUGH THE OVERNIGHT. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLASH FLOODING. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. NICOSIA/WINTHER
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 11:30 PM EDT | Flash Flood Warning | CTP | Cumberland, Franklin, Perry | 4 hr |
| Sep 11, 12:57 AM EDT | Flash Flood Warning | CTP | Snyder, Union | 4 hr |
| Sep 11, 12:57 AM EDT | Flash Flood Warning | CTP | Juniata | 4 hr |
| Sep 11, 3:27 AM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Perry | 5 hr |
| Sep 11, 4:00 AM EDT | Flash Flood Warning | CTP | Lancaster | 4 hr |
| Sep 11, 4:57 AM EDT | Flash Flood Warning | CTP | Juniata, Snyder | 3 hr |
| Sep 11, 7:46 AM EDT | Flash Flood Warning | CTP | Cumberland, Perry | 3 hr |
| Sep 11, 10:41 AM EDT | Flash Flood Warning | CTP | Cumberland, Perry | 3 hr |
| Sep 11, 6:19 PM EDT | Severe Thunderstorm Warning | CTP | York | 56 min |
Nearby
Flash Flood Warnings in Pennsylvania, 1997Every flash flood warning in 1997
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.