Alert archive / Pennsylvania / Areal Flood Warnings in 2012
Areal Flood Warning 43, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Dec 21, 2012, 9:24 AM EST for Delaware County, Pennsylvania. It was in force for 4 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
- Dec 21, 2012, 9:24 AM EST (14:24 UTC)
- Expired
- Dec 21, 2012, 1:15 PM EST
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Delaware County, PA
The radar
The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 14:27 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 2.4 hours before the alert went out and 203 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
- 1099 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- -242 m²/s²
- 0-3 km storm-relative helicity
- -92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
048
WGUS41 KPHI 211424
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
924 AM EST FRI DEC 21 2012
PAC045-211815-
/O.NEW.KPHI.FA.W.0043.121221T1424Z-121221T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE PA-
924 AM EST FRI DEC 21 2012
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 115 PM EST
* AT 921 AM EST...CRUM CREEK AT NEWTOWN SQUARE REMAINED ABOVE FLOOD
STAGE. THE RIVER GAGE INDICATED THAT THE WATER LEVEL HAS CRESTED AND
IS BEGINNING TO RECEDE.
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.
DRIVING INTO FLOOD WATERS COULD PUT YOUR LIFE AT RISK AND COST YOU
THOUSANDS OF DOLLARS IN VEHICLE REPAIRS. FLOOD WATERS MAY BE DEEPER
THAN YOU THINK. TURN AROUND AND FIND AN ALTERNATE ROUTE.
&&
LAT...LON 3994 7553 3998 7545 4000 7545 4003 7541
4004 7541 4007 7536 3996 7525 3994 7523
3988 7526 3987 7521 3985 7526 3985 7533
3980 7541 3983 7549 3984 7560 3987 7560
$$
KRUZDLO1 follow-up statement
388
WGUS81 KPHI 211808
FLSPHI
FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
108 PM EST FRI DEC 21 2012
PAC045-211817-
/O.EXP.KPHI.FA.W.0043.000000T0000Z-121221T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE PA-
108 PM EST FRI DEC 21 2012
...THE FLOOD WARNING WILL EXPIRE AT 115 PM EST FOR URBAN AREAS AND
SMALL STREAMS IN DELAWARE COUNTY...
SMALL CREEKS AND STREAMS CONTINUE TO RECEDE. THE FLOOD WARNING WILL
BE ALLOWED TO EXPIRE AT 115 PM.
LAT...LON 3994 7553 3998 7545 4000 7545 4003 7541
4004 7541 4007 7536 3996 7525 3994 7523
3988 7526 3987 7521 3985 7526 3985 7533
3980 7541 3983 7549 3984 7560 3987 7560
$$
KRUZDLOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 9:00 PM EST | Winter Weather Advisory | PHI | Carbon, Monroe | 2 hr |
| Dec 20, 9:11 PM EST | Wind Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 12 hr |
| Dec 21, 12:27 AM EST | Coastal Flood Warning | PHI | Delaware, Philadelphia | 11 hr |
| Dec 21, 4:44 AM EST | Areal Flood Warning | PHI | Chester, Montgomery | 14 hr |
| Dec 21, 5:17 AM EST | Areal Flood Warning | PHI | Delaware | 4 hr |
| Dec 21, 5:39 AM EST | Areal Flood Warning | PHI | Bucks | 10 hr |
| Dec 21, 7:15 AM EST | River Flood Warning | PHI | Delaware | 4 hr |
| Dec 21, 7:36 AM EST | Areal Flood Warning | PHI | Monroe, Northampton | 15 hr |
| Dec 21, 7:49 AM EST | Areal Flood Warning | PHI | Philadelphia | 11 hr |
| Dec 21, 9:36 AM EST | River Flood Warning | PHI | Bucks | 10 hr |
| Dec 21, 12:08 PM EST | River Flood Warning | PHI | Chester, Delaware | 5 hr |
| Dec 21, 3:16 PM EST | Wind Advisory | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 27 hr |
Nearby
Areal Flood Warnings in Pennsylvania, 2012Every areal flood warning in 2012
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.