Alert archive / Pennsylvania / Flash Flood Warnings in 1999
Flash Flood Warning 70, NWS State College, PA
NWS State College, PA issued this flash flood warning at Sep 30, 1999, 1:25 AM EDT for Snyder County, Union 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 counties it named.
The facts
- Issued
- Sep 30, 1999, 1:25 AM EDT (05:25 UTC)
- Expired
- Sep 30, 1999, 4:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Snyder County, PA, Union County, PA
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 00:00Z, 5.4 hours before the alert went out and 176 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
- 1173 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 155 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 300533 FFWCTP PAC109-119-300830- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE STATE COLLEGE PA 125 AM EDT THU SEP 30 1999 THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A * FLASH FLOOD WARNING FOR... SNYDER COUNTY. UNION COUNTY. * UNTIL 430 AM EDT. * AT 125 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LARGE AREA OF MODERATE TO HEAVY RAINFALL OCCURRING ACROSS UNION AND SNYDER COUNTIES. RAINFALL SINCE THE EVENING HOURS OF WEDNESDAY TOTALED BETWEEN 2.5 AND 3 INCHES ACROSS THE WARNED AREA. ADDITIONAL RAINFALL OF AROUND 1 INCH WILL OCCUR OVER THE NEXT 3 HOURS. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...ALONG WITH SIGNIFICANT PONDING OF WATER IN POOR DRAINAGE AREAS ON HIGHWAYS...STREETS AND UNDERPASSES. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLA&SH 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/ LAMBERT
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 29, 9:30 PM EDT, 3 hours 55 minutes earlier.
Area forecast discussion, Sep 29, 9:30 PM EDT, 3 hours 55 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
930 PM EDT WED SEP 29 1999
COLD FRONT MOVING A BIT FASTER THAN PREVIOUSLY THOUGHT...JUST ABOUT
TO ENTER THE WESTERN AREAS OF CTP CWA.
TWO THINGS TO CONSIDER. FIRST IS HIGH WIND WARNING. WITH VAD WINDS
PRETTY MUCH CONFIRMING WHAT THE MODELS WERE PROJECTING...THAT IS A
50 KT WIND AT AROUND 5K FEET...THINK I WILL KEEP HIGH WIND WARNING.
GOOD BAND OF CONVECTION AHEAD OF THE FRONT MAY MIX DAMAGING WINDS
DOWN TO THE SURFACE. ALTHOUGH SEVERE THREAT DIMINISHED...NEED TO
KEEP SOME TYPE OF WARNING OUT FOR THE HIGH WINDS.
AS FOR THE FLOODING...HAVE NOT SEEN ANY YET. IF FRONT CONTINUES TO
MOVE AT A GOOD CLIP...PROBABLY WILL SEE LITTLE IN THE WAY OF
FLOODING. HOWEVER STILL EXPECTING PCPN TO BLOSSOM SOMEWHAT OVER
CENTRAL AND EASTERN ZONES...WITH ADDED LL CONVERGENCE OF STRONG WEST
WIND BEHIND FRONT AND SOUTHEAST OVER SUSQUEHANNA VALLEY. ALSO...GULF
AND ATLANTIC MOISTURE WILL CONTINUE TO BE INCREASINGLY TAPPED WITH
TIME OVERNIGHT. HATE TO MAKE ADJUSTMENTS JUST AS HEAVIEST RAIN
MOVING INTO THE CWA. WILL THEREFORE KEEP THE WATCH INTACT AS WELL.
OVERALL...SEE NO MAJOR CHANGES TO THE OVERNIGHT ZONES...AS FORECAST
PACKAGE WAS PRETTY MUCH TAILORED A FEW HOURS AGO WITH THE PREVIOUS
UPDATE. WILL ADJUST TIMING OF WSHFT AND FROPA AS NEEDED.
.CTP...FLASH FLOOD WATCH INTO THU AM ALL COUNTIES.
...HIGH WIND WATCH OVERNIGHT ALL COUNTIES.
JUNGIn the hours before
Special weather statement, Sep 29, 8:10 PM EDT, 5 hours 15 minutes before
PAZ004>006-010>012-017>019-024>026-033>035-045-300200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 810 PM EDT WED SEP 29 1999 ...THE TORNADO WATCH FOR CENTRAL PENNSYLVANIA HAS BEEN CANCELLED... THE NATIONAL WEATHER SERVICE HAS CANCELLED THE TORNADO WATCH FOR THE FOLLOWING COUNTIES IN CENTRAL PENNSYLVANIA... WARREN... MCKEAN... POTTER... ELK... CAMERON... CLINTON... CENTRE... CLEARFIELD... CAMBRIA... BLAIR... HUNTINGDON... SOMERSET... BEDFORD AND FULTON. SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE REGION OVERNIGHT. ALTHOUGH ANY INDIVIDUAL THUNDERSTORM MAY PRODUCE A LOCAL GUST OF DAMAGING WIND...THE THREAT OF TORNADOES IS NO LONGER PRESENT. A HIGH WIND WARNING REMAINS IN EFFECT FOR ALL OF CENTRAL PENNSYLVANIA OVERNIGHT. STAY TUNED TO NOAA WEATHER RADIO...THE OFFICIAL VOICE OF THE NATIONAL WEATHER SERVICE...OR YOUR FAVORITE TELEVISION OR COMMERCIAL RADIO NEWS SOURCE FOR LATER STATEMENTS AND FORECASTS. .END/ JUNG ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE WORLD WIDE WEB AT: HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE)
Special weather statement, Sep 29, 8:10 PM EDT, 5 hours 15 minutes before
PAZ004>006-010>012-017>019-024>026-033>035-045-300200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 810 PM EDT WED SEP 29 1999 ...THE TORNADO WATCH FOR CENTRAL PENNSYLVANIA HAS BEEN CANCELLED... THE NATIONAL WEATHER SERVICE HAS CANCELLED THE TORNADO WATCH FOR THE FOLLOWING COUNTIES IN CENTRAL PENNSYLVANIA... WARREN... MCKEAN... POTTER... ELK... CAMERON... CLINTON... CENTRE... CLEARFIELD... CAMBRIA... BLAIR... HUNTINGDON... SOMERSET... BEDFORD AND FULTON. SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE REGION OVERNIGHT. ALTHOUGH ANY INDIVIDUAL THUNDERSTORM MAY PRODUCE A LOCAL GUST OF DAMAGING WIND...THE THREAT OF TORNADOES IS NO LONGER PRESENT. A HIGH WIND WARNING REMAINS IN EFFECT FOR ALL OF CENTRAL PENNSYLVANIA OVERNIGHT. STAY TUNED TO NOAA WEATHER RADIO...THE OFFICIAL VOICE OF THE NATIONAL WEATHER SERVICE...OR YOUR FAVORITE TELEVISION OR COMMERCIAL RADIO NEWS SOURCE FOR LATER STATEMENTS AND FORECASTS. .END/ JUNG ADDITIONAL WEATHER INFORMATION CAN BE FOUND ON THE WORLD WIDE WEB 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 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield | 54 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Cameron | 54 min |
| Sep 29, 10:27 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 78 min |
| Sep 29, 11:43 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 47 min |
| Sep 29, 11:46 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 44 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 51 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 66 min |
| Sep 30, 12:35 AM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin | 40 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 59 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 59 min |
| Sep 30, 1:02 AM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 43 min |
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.