Alert archive / Pennsylvania / Areal Flood Warnings in 2022
Areal Flood Warning 21, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at May 7, 2022, 12:23 PM EDT for Montgomery County, Pennsylvania. 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
- May 7, 2022, 12:23 PM EDT (16:23 UTC)
- Expired
- May 7, 2022, 5:41 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 106 km from the middle of the area, began a volume at 16:23 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, 4.4 hours before the alert went out and 228 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
- 461 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
537
WGUS41 KPHI 071623
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1223 PM EDT Sat May 7 2022
PAC091-072030-
/O.NEW.KPHI.FA.W.0021.220507T1623Z-220507T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-
1223 PM EDT Sat May 7 2022
...FLOOD WARNING IN EFFECT UNTIL 430 PM EDT THIS AFTERNOON...
* WHAT...Flooding caused by excessive rainfall is expected.
* WHERE...A portion of southeast Pennsylvania...including the
following county...Montgomery.
* WHEN...Until 430 PM EDT.
* IMPACTS...Flooding of rivers, creeks, streams, and other low-lying
and flood-prone locations is imminent or occurring.
* ADDITIONAL DETAILS...
- At 1221 PM EDT, Doppler radar indicated heavy rain. Flooding
is ongoing or expected to begin shortly in the warned area.
The Perkiomen Creek at East Greenville has exceeded flood
stage and will likely remain above flood stage for several
hours. Between 1.5 and 2.5 inches of rain have fallen.
- For Perkiomen Creek at East Greenville:
At 12:16pm the stage was 5.09 feet.
Flood Stage is 5 feet.
...
For West Branch Perkiomen Creek at Hillegass:
At 11:15am the stage was 2.28 feet.
Flood Stage is 5 feet.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4042 7554 4043 7551 4036 7547 4035 7552
$$
JEO2 follow-up statements
037
WGUS41 KPHI 072017
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
417 PM EDT Sat May 7 2022
PAC091-072200-
/O.EXT.KPHI.FA.W.0021.000000T0000Z-220507T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-
417 PM EDT Sat May 7 2022
...FLOOD WARNING NOW IN EFFECT UNTIL 6 PM EDT THIS EVENING...
* WHAT...Flooding caused by excessive rainfall continues.
* WHERE...A portion of southeast Pennsylvania...including the
following county...Montgomery.
* WHEN...Until 600 PM EDT.
* IMPACTS...Flooding of rivers, creeks, streams, and other low-lying
and flood-prone locations is imminent or occurring.
* ADDITIONAL DETAILS...
- At 416 PM EDT, Doppler radar indicated heavy rain. Flooding
is occurring on the Perkiomen Creek at East Greenville.
Between 2 and 2.5 inches of rain have fallen.
- For Perkiomen Creek at East Greenville:
At 3:47pm the stage was 5.69 feet.
Flood Stage is 5 feet.
...
For West Branch Perkiomen Creek at Hillegass:
At 3:15pm the stage was 2.5 feet.
Flood Stage is 5 feet.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4042 7554 4043 7551 4036 7547 4035 7552
$$
JEO683 WGUS81 KPHI 072141 FLSPHI Flood Statement National Weather Service Mount Holly NJ 541 PM EDT Sat May 7 2022 PAC091-072151- /O.CAN.KPHI.FA.W.0021.000000T0000Z-220507T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Montgomery PA- 541 PM EDT Sat May 7 2022 ...FLOOD WARNING IS CANCELLED... The Flood Warning is cancelled for Northwestern Montgomery County. Flood waters have receded. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 4042 7554 4043 7551 4036 7547 4035 7552 $$ JEO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 4:36 AM EDT | Coastal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 3 days |
| May 7, 10:39 AM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 5 hr |
| May 7, 12:14 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 4 hr |
Nearby
Areal Flood Warnings in Pennsylvania, 2022Every areal flood warning in 2022
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.