Alert archive / Pennsylvania / Flash Flood Warnings in 2004
Flash Flood Warning 9, NWS State College, PA
NWS State College, PA issued this flash flood warning at May 21, 2004, 5:19 AM EDT for Warren County, Pennsylvania. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 21, 2004, 5:19 AM EDT (09:19 UTC)
- Expired
- May 21, 2004, 9:15 AM EDT
- In force
- 4 hr
- Issued by
- NWS State College, PA
- Area
- Counties, with a storm outline in the text
County Warren County, PA
The radar
The Buffalo radar (KBUF), 128 km from the middle of the area, began a volume at 09:20 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 21, 6:23 AM EDT | FLASH FLOOD | Chandlers Valley, PA | NUMEROUS WATER RESCUES IN SUGAR GROVE. VEHICLES WASHED OFF ROAD RT 957 |
| May 21, 6:50 AM EDT | FLASH FLOOD | Sugar Grove, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 9.3 hours before the alert went out and 127 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
- 1163 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 875 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 339 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 9.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KCTP 210920 FFWCTP PAC123-211315- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE STATE COLLEGE PA 519 AM EDT FRI MAY 21 2004 THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A * FLASH FLOOD WARNING FOR... WARREN COUNTY IN NORTH CENTRAL PENNSYLVANIA * UNTIL 915 AM EDT. * AT 509 AM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THUNDERSTORMS WITH VERY HEAVY RAINFALL. SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING IN THE VICINITY OF SUGAR GROVE OF NORTH CENTRAL WARREN COUNTY. SOME CREEKS THAT WILL BE IMPACTED ARE LITTLE BROKENSTRAW CREEK...STILLWATER CREEK...AND PATCHEN RUN...ESPECIALLY BETWEEN BEAR LAKE AND SUGAR GROVE. ADDITIONAL THUNDERSTORMS MAY PRODUCE UP TO AN ADDITIONAL INCH OF RAINFALL THROUGH 7 AM. 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. SMALL CREEKS AND STREAMS WILL RAPIDLY FLOOD...POSSIBLY WASHING OUT ROADS AND FLOODING NEARBY LOW AREAS. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. NEVER ATTEMPT TO CROSS HIGH WATER IN A VEHICLE OR ON FOOT PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772. LAT...LON 4199 7895 4164 7898 4165 7960 4199 7961 $$ KL/BL
1 follow-up statement
000 WGUS71 KCTP 211052 FFSCTP PAC123-211245- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 644 AM EDT FRI MAY 21 2004 ...A FLASH FLOOD WARNING CONTINUES FOR WARREN COUNTY UNTIL 915 AM EDT... AT 637 AM EDT...LOCAL LAW EMERGENCY MANAGEMENT OFFICIALS AND LAW ENFORCEMENT OFFICIALS REPORTED FLOODING...ROAD CLOSURES AND EVACUATIONS AROUND THE TOWN OF SUGAR GROVE IN NORTHERN WARREN COUNTY. PERIODS OF VERY HEAVY RAINFALL FROM TRAINING THUNDERSTORMS ALONG A SLOW MOVING COLD FRONT WILL CONTINUE INTO LATE THIS MORNING. ADDITIONAL RAINFALL AMOUNTS OF ONE HALF INCH...TO ONE AND ONE HALF INCHES DURING THE NEXT 1 TO 2 HOURS WILL CONTINUE...AND POSSIBLY INCREASE THE EXTENT OF FLOODING FROM NEAR BEAR LAKE...EAST THROUGH SUGAR GROVE...TO RUSSELL AND GERMANY. SMALL CREEKS AND STREAMS WILL RAPIDLY FLOOD...POSSIBLY WASHING OUT ROADS AND FLOODING NEARBY LOW AREAS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED. MOVE TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. NEVER ATTEMPT TO CROSS HIGH WATER IN A VEHICLE OR ON FOOT CAMPERS IN THE WARNED AREA MUST MOVE TO HIGHER GROUND IMMEDIATELY. LAT...LON 4201 7962 4192 7958 4185 7897 4200 7898 $$ LAMBERT
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 10:51 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 54 min |
| May 20, 11:18 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 72 min |
| May 20, 11:48 PM EDT | Flash Flood Warning | CTP | Clearfield | 6 hr |
| May 21, 4:54 AM EDT | Flash Flood Warning | CTP | Clearfield | 4 hr |
| May 21, 6:29 AM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 61 min |
| May 21, 6:31 AM EDT | Flash Flood Warning | CTP | Blair | 4 hr |
| May 21, 7:11 AM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair | 49 min |
| May 21, 6:55 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Clearfield, Somerset | 80 min |
| May 21, 7:30 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair | 60 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2004Every flash flood warning in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.