Alert archive / Maryland / Flash Flood Warnings in 2009
Flash Flood Warning 51, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 22, 2009, 4:46 PM EDT for Caroline County, Maryland. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2009, 4:46 PM EDT (20:46 UTC)
- Expired
- Aug 22, 2009, 10:14 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Caroline County, MD
The radar
The Dover AFB radar (KDOX), 36 km from the middle of the area, began a volume at 20:46 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.8 hours before the alert went out and 113 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
- 1451 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS51 KPHI 222046 FFWPHI MDC011-230045- /O.NEW.KPHI.FF.W.0051.090822T2046Z-090823T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 446 PM EDT SAT AUG 22 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL CAROLINE COUNTY IN EASTERN MARYLAND... * UNTIL 845 PM EDT * AT 443 PM EDT...MORE HEAVY RAIN IS GOING TO ADD TO THE FLASH FLOODING PROBLEM THAT OCCURED EARLIER THIS MORNING. THIS IS BECOMING A POTENTIALLY DANGEROUS SITUATION ESPECIALLY IN THE TOWN OF RIDGELY WHERE OVER NINE INCHES FELL THIS MORNING. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RIDGELY AND DENTON PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3893 7592 3900 7583 3883 7572 3871 7586 $$ EBERWINE
3 follow-up statements
000 WGUS71 KPHI 222231 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 631 PM EDT SAT AUG 22 2009 MDC011-230045- /O.CON.KPHI.FF.W.0051.000000T0000Z-090823T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CAROLINE MD- 631 PM EDT SAT AUG 22 2009 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR CENTRAL CAROLINE COUNTY... POTENTIALLY DANGEROUS SITUATION DEVELOPING THROUGHOUT THE EVENING HOURS ESPECIALLY OVER PARTS OF THE COUNTY THAT RECEIVED VERY HEAVY RAINS THIS MORNING. A ROAD WAS WASHED OUT SOUTH OF RIDGELY THIS MORNING AND ANY ATTEMPT AT CLEANING UP WILL BE HAMPERED BY ADDITIONAL RAINS THIS EVENING. IT IS VERY POSSIBLE THAT PARTS OF CAROLINE COUNTY COULD RECEIVE ANOTHER THREE TO FIVE INCHES BEFORE MIDNIGHT. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3893 7592 3900 7583 3883 7572 3871 7586 $$ EBERWINE
000 WGUS51 KPHI 230034 FFWPHI MDC011-230245- /O.EXT.KPHI.FF.W.0051.000000T0000Z-090823T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 834 PM EDT SAT AUG 22 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE * FLASH FLOOD WARNING FOR... CENTRAL CAROLINE COUNTY IN EASTERN MARYLAND... * UNTIL 1045 PM EDT * AT 826 PM EDT...VERY HEAVY RAIN WAS STILL FALLING IN THE VICINITY OF RIDGELY. RADAR ESTIMATED ABOUT AN INCH AN HOUR. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RIDGELY AND DENTON RIDGELY HAS RECEIVED OVER 13 INCHES IN THE PAST 24 HOURS INCLUDING THE 5 OR 6 INCHES THIS EVENING. BASEMENTS AND CRAWL SPACES ARE FLOODED WITH SOME ROADS WASHED AWAY AND UP TO SEVEN ROADS CLOSED. THE RAIN WILL CONTINUE HEAVY FOR THE NEXT HOUR THEN BEGIN TO TAPER OFF. PLEASE AVOID THIS PART OF CARLINE COUNTY TONIGHT. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3893 7592 3900 7583 3883 7572 3871 7586 $$ EBERWINE
000 WGUS71 KPHI 230214 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1014 PM EDT SAT AUG 22 2009 MDC011-230222- /O.CAN.KPHI.FF.W.0051.000000T0000Z-090823T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CAROLINE MD- 1014 PM EDT SAT AUG 22 2009 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL CAROLINE COUNTY... THE RAIN HAS ENDED OVER CAROLINE COUNTY BUT TRAVEL THROUGH THE COUNTY ESPECIALLY THROUGH RIDGELY SHOULD BE AVOIDED SINCE SEVERAL ROADS ARE STILL FLOODED AND SOME WERE WASHED AWAY. CHECK WITH OFFICIALS FOR THE LATEST INFORMATION ON TRAVEL. THERE IS AN AREA OF RAIN OVER QUEEN ANNES COUNTY AND NORTH TO PENNSYLVANIA BUT IT IS NOT EXPECTED TO WIDESPREAD OR VERY HEAVY. HOWEVER...A FLASH FLOOD WATCH CONTINUES FOR THE REGION. LAT...LON 3893 7592 3900 7583 3883 7572 3871 7586 $$ EBERWINE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 10:14 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 3 hr |
| Aug 21, 11:49 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 116 min |
| Aug 22, 12:45 AM EDT | Areal Flood Warning | PHI | Caroline | 17 hr |
| Aug 22, 1:28 AM EDT | Flash Flood Warning | PHI | Caroline, Queen Anne's | 4 hr |
| Aug 22, 2:19 AM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 6 hr |
| Aug 22, 4:26 AM EDT | Areal Flood Advisory | PHI | Caroline | 6 hr |
| Aug 22, 5:42 AM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's | 3 hr |
| Aug 22, 8:12 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 3 hr |
| Aug 22, 3:53 PM EDT | Flash Flood Warning | PHI | Caroline, Talbot | 6 hr |
| Aug 22, 5:40 PM EDT | Areal Flood Warning | PHI | Caroline | 14 hr |
| Aug 22, 6:02 PM EDT | Flash Flood Warning | PHI | Cecil, Kent, Queen Anne's | 4 hr |
Nearby
Flash Flood Warnings in Maryland, 2009Every flash flood warning in 2009
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.