Alert archive / Delaware / Areal Flood Warnings in 2011
Areal Flood Warning 84, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Sep 8, 2011, 7:41 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 14 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
- Sep 8, 2011, 7:41 PM EDT (23:41 UTC)
- Expired
- Sep 9, 2011, 9:23 AM EDT
- In force
- 14 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 31 km from the middle of the area, began a volume at 23:41 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, 11.7 hours before the alert went out and 91 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
- 1152 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 672 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
457
WGUS41 KPHI 082341
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
741 PM EDT THU SEP 8 2011
DEC001-005-MDC011-090530-
/O.NEW.KPHI.FA.W.0084.110908T2341Z-110909T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT DE-CAROLINE MD-SUSSEX DE-
741 PM EDT THU SEP 8 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLOOD WARNING FOR...
SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
SOUTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
WESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
* UNTIL 130 AM EDT
* AT 737 PM EDT...FLOODING CONTINUES ACROSS A PORTION OF THE WARNED
AREA AS A RESULT OF THE VERY HEAVY RAIN THIS AFTERNOON. SMALL
STREAM FLOODING IS EXPECTED TO CONTINUE INTO THE EARLY MORNING
HOURS...AS THE NANTICOKE RIVER IN BRIDGEVILLE CONTINUES TO RISE.
A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED.
STREAM RISES WILL BE SLOW AND FLASH FLOODING IS NOT EXPECTED.
HOWEVER...ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS
IMMEDIATELY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.
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.
&&
LAT...LON 3846 7570 3865 7572 3867 7576 3867 7580
3869 7583 3868 7592 3880 7592 3881 7590
3883 7592 3892 7591 3894 7541 3845 7538
$$
HAYES2 follow-up statements
863
WGUS41 KPHI 090519
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
119 AM EDT FRI SEP 9 2011
DEC001-005-MDC011-091330-
/O.EXT.KPHI.FA.W.0084.000000T0000Z-110909T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT DE-CAROLINE MD-SUSSEX DE-
119 AM EDT FRI SEP 9 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS EXTENDED THE
* FLOOD WARNING FOR...
SOUTHERN KENT COUNTY IN CENTRAL DELAWARE...
SOUTHERN CAROLINE COUNTY IN EASTERN MARYLAND...
WESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
* AT 115 AM EDT...FLOODING WAS CONTINUING ACROSS A PORTION OF THE
WARNED AREA AS A RESULT OF THE VERY HEAVY RAIN THURSDAY AFTERNOON.
FLOODING IS EXPECTED TO CONTINUE UNTIL WATER LEVELS ALONG
THE NANTICOKE RIVER BEGIN TO FALL LATER TODAY.
A FLOOD WARNING MEANS THAT FLOODING IS ALREADY OCCURRING. STREAM
RISES WILL BE SLOW AND FLASH FLOODING IS NOT EXPECTED. HOWEVER...ALL
INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS IMMEDIATELY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3846 7570 3865 7572 3867 7576 3867 7580
3869 7583 3868 7592 3880 7592 3881 7590
3883 7592 3892 7591 3894 7541 3845 7538
$$
JJM279
WGUS81 KPHI 091323
FLSPHI
FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
923 AM EDT FRI SEP 9 2011
DEC001-005-MDC011-091327-
/O.CAN.KPHI.FA.W.0084.000000T0000Z-110909T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT DE-CAROLINE MD-SUSSEX DE-
923 AM EDT FRI SEP 9 2011
...THE FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN SUSSEX...SOUTHERN
CAROLINE AND SOUTHERN KENT COUNTIES...
WATER CONTINUED TO SLOWLY RECEDE ALONG AND ADJACENT TO THE NANTICOKE
RIVER. ALTHOUGH COUNTY OFFICIALS REPORTED SOME REMNANT MINOR
FLOODING REMAINED IN PLACE, THE WARNING WHICH ENDS AT 9:30 AM HAS
BEEN CANCELLED.
LAT...LON 3846 7570 3865 7572 3867 7576 3867 7580
3869 7583 3868 7592 3880 7592 3881 7590
3883 7592 3892 7591 3894 7541 3845 7538
$$
KRUZDLOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 9:23 AM EDT | Areal Flood Advisory | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 4 hr |
| Sep 8, 1:51 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 6 hr |
| Sep 8, 3:53 PM EDT | Flash Flood Warning | PHI | Caroline | 4 hr |
| Sep 8, 4:27 PM EDT | Special Weather Statement | PHI | Caroline | 63 min |
| Sep 8, 1:29 AM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 4 hr |
| Sep 8, 3:26 AM EDT | Flash Flood Warning | PHI | Kent, Sussex | 5 hr |
| Sep 8, 3:41 AM EDT | River Flood Warning | PHI | New Castle | 14 hr |
| Sep 8, 5:30 AM EDT | Coastal Flood Advisory | PHI | Kent, New Castle | 17 hr |
| Sep 8, 9:56 AM EDT | Special Weather Statement | PHI | Kent | 64 min |
Nearby
Areal Flood Warnings in Delaware, 2011Areal Flood Warnings in Maryland, 2011Every areal flood warning in 2011
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.