Alert archive / Pennsylvania / Flash Flood Warnings in 2011
Flash Flood Warning 18, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 13, 2011, 9:56 PM EDT for Berks County, Lehigh County, Northampton 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
- Aug 13, 2011, 9:56 PM EDT (01:56 UTC)
- Expired
- Aug 14, 2011, 1:45 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Berks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 01:56 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 |
|---|---|---|---|
| Aug 13, 10:15 PM EDT | FLASH FLOOD | Hamburg, PA | ROADS FLOODED... RESIDENTIAL FLOODING... AND MINOR ROCK MUD SLIDES |
| Aug 14, 1:14 AM EDT | FLASH FLOOD | Bethlehem, PA | FLOODING ON THE MONOCACY CREEK CAUSED EVACUATION OF THE MUSIKFEST. ONE TENT ON THE FESTIVAL GROUNDS COLLAPSED... NO INJURIES WERE REPORTED |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 1.9 hours before the alert went out and 216 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
- NaN m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
283
WGUS51 KPHI 140156
FFWPHI
PAC011-077-095-140545-
/O.NEW.KPHI.FF.W.0018.110814T0156Z-110814T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
956 PM EDT SAT AUG 13 2011
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN BERKS COUNTY...
LEHIGH COUNTY...
NORTHAMPTON COUNTY...
* UNTIL 145 AM EDT...
* AT 947 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES
AND RAIN GAGE REPORTS INDICATED BETWEEN 2 AND 3 INCHES OF RAIN HAS
FALLEN OVER PORTIONS OF THE WARNED AREA DURING THE PAST FEW HOURS.
WITH ADDITIONAL RAIN ON THE WAY...FLASH FLOODING IS EXPECTED OR
ALREADY OCCURRING. ROADWAY FLOODING CAN BE EXPECTED...AND
SMALL STREAMS IN THE VICINITY OF HEAVY RAIN WILL EXCEED THEIR
BANKS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR CAR THROUGH FLOODED ROADWAYS...THE WATER MAY BE
DEEPER THAN YOU THINK.
PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.
&&
LAT...LON 4086 7505 4084 7510 4079 7510 4074 7520
4068 7521 4067 7519 4065 7521 4061 7521
4057 7533 4037 7573 4056 7613 4060 7605
4059 7603 4064 7600 4078 7570 4086 7531
4092 7524 4096 7514
$$
FORECASTER:JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 9:39 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 13, 11:33 PM EDT | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Aug 14, 12:37 AM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 14, 1:12 AM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 14, 3:42 AM EDT | Flash Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 25 hr |
| Aug 14, 3:55 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 14, 4:45 AM EDT | Special Weather Statement | PHI | Philadelphia | 60 min |
| Aug 14, 6:24 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 14, 7:43 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 14, 9:21 AM EDT | Areal Flood Warning | PHI | Northampton | 3 hr |
| Aug 14, 12:37 PM EDT | Areal Flood Warning | PHI | Bucks, Lehigh, Northampton | 7 hr |
| Aug 14, 1:00 PM EDT | Areal Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 8 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2011Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.