Alert archive / Pennsylvania / Flash Flood Warnings in 1999
Flash Flood Warning 56, NWS State College, PA
NWS State College, PA issued this flash flood warning at Sep 7, 1999, 3:45 AM EDT for Tioga County, Pennsylvania. It was in force for 2 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 7, 1999, 3:45 AM EDT (07:45 UTC)
- Expired
- Sep 7, 1999, 6:00 AM EDT
- In force
- 2 hr
- Issued by
- NWS State College, PA
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Tioga County, PA
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 7.8 hours before the alert went out and 172 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
- 35 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 617 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 142 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 070633
FFWCTP
PAC043-081-099-109-117-119-133-071000-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
225 AM EDT TUE SEP 7 1999
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE
* FLASH FLOOD WARNING FOR...
YORK COUNTY.
PERRY COUNTY.
DAUPHIN COUNTY.
SNYDER COUNTY.
UNION COUNTY.
LYCOMING COUNTY.
SOUTHERN TIOGA COUNTY.
* UNTIL 6 AM EDT.
* EMERGENCY MANAGEMENT OFFICIALS REPORT WIDESPREAD FLOODING PERRY...
UNION...DAUPHIN AND SNYDER COUNTIES. FLOODING IS ALSO
REPORTED IN YORK COUNTY.
VERY HEAVY RAIN CONTINUES TO FALL OVER THE AREA NORTH OF
HARRISBURG...FROM ABOUT SAXTON UP THROUGH NORTHUMBERLAND...LEWISBURG
AND WATSONTOWN. THE RAIN IS FALLING OVER AREAS WHERE VERY HEAVY RAIN
HAS FALLEN ALREADY THIS EVENING...LEADING TO LOCALIZED FLASH FLOODING.
IN AREAS WHERE THE RAIN HAS TAPERED OFF...RUNOFF FROM THE EARLIER
HEAVY RAINS WILL CONTINUE TO CAUSE FLOODING PROBLEMS FOR THE NEXT
FEW HOURS.
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/ LA CORTE
LAT...LON 4108 7717 4086 7737 4071 7734 4065 7698
4030 7766 4020 7760 4033 7692 4021 7686
4006 7708 3994 7701 3974 7699 3974 7629
4012 7672 4022 7660 4047 7669 4056 7655
4068 7671 4064 7692 4095 7686 4116 7690
4121 7656F 4162 7683 4156 7762
&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 Sep 7, 3:45 AM EDT, 0 minutes earlier.
Area forecast discussion, Sep 7, 3:45 AM EDT, 0 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 345 AM EDT TUE SEP 7 1999 ...WORK ZONES OUT AS PHLADMCTP... IR IMAGERY AND SFC OBS INDICATING SFC LOW OVER NORTHWEST PA EARLY THIS MORNING. MEANWHILE...LL JET PRODUCING FLOODING RAINS CONTINUES TO SPIRAL NORTHEASTWARD. WILL DROP FLASH FLOOD WATCH FOR ALL BUT OUR NORTHEAST ZONES...WHERE HEAVY RAIN CONTINUES TO FALL. LATEST ETA SUGGESTS THAT STEADY RAIN WILL LIFT NORTH OF ENTIRE CWA DURING THE MID MORNING HOURS. EXPECT PARTLY SUNNY SKIES TO DEVELOP FROM SOUTHWEST TO NORTHEAST AS DRY SLOT WORKS UP INTO THE AREA. HOWEVER...MODEL SOUNDINGS STILL SEEM UNSTABLE ENOUGH TO SUPPORT SCT SHOWERS/TSRA THIS AFTERNOON. TONIGHT...SECONDARY S/WV PROGGED TO SWING THROUGH THE AREA CUD BRING A FEW MORE SHOWERS/TSRA DURING THE EVENING HOURS. THEN CLEARING SKIES...LIGHT WINDS...AND RECENT RAINS WILL LIKELY COMBINE TO FORM AREAS OF DENSE FOG TONIGHT. WEDNESDAY...SUBSIDENCE BEHIND DEPARTING TROUGH WILL BRING PARTLY TO MOSTLY SUNNY SKIES ON WEDNESDAY. 8H TEMPS AROUND 15C SUPPORT TEMPS FROM THE U70S OVER THE MTNS TO THE M80S IN THE SUSQ VALL. .CTP...FLASH FLOOD WATCH FOR PORTIONS OF THE MIDDLE SUSQUEHANNA VALLEY AND NORTHERN MOUNTAINS THROUGH THIS MORNING. FITZGERALD
In the hours before
Local storm report, Sep 6, 11:24 PM EDT, 4 hours 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1124 PM EDT MON SEP 06 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0500 PM MARYSVILLE PA WIND DAMAGE
09/06/99 PERRY TREE DOWN BLOCKING RTE 850Local storm report, Sep 6, 11:24 PM EDT, 4 hours 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1124 PM EDT MON SEP 06 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0500 PM MARYSVILLE PA WIND DAMAGE
09/06/99 PERRY TREE DOWN BLOCKING RTE 850The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 9:07 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, Perry, York | 3 hr |
| Sep 6, 11:37 PM EDT | Flash Flood Warning | CTP | Lycoming, Snyder, Union | 3 hr |
| Sep 6, 11:47 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, York | 3 hr |
| Sep 6, 11:47 PM EDT | Flash Flood Warning | CTP | Perry | 3 hr |
| Sep 7, 2:06 AM EDT | Flash Flood Warning | CTP | Northumberland | 3 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Perry, Snyder, Union | 4 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Dauphin, York | 4 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Lycoming | 4 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.