Alert archive / Pennsylvania / Areal Flood Warnings in 2012
Areal Flood Warning 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Jun 2, 2012, 2:45 AM EDT for Montgomery County, Pennsylvania. It was in force for 6 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
- Jun 2, 2012, 2:45 AM EDT (06:45 UTC)
- Expired
- Jun 2, 2012, 8:45 AM EDT
- In force
- 6 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 06:46 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 6.8 hours before the alert went out and 226 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
- 497 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 621 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 289 m²/s²
- 0-3 km storm-relative helicity
- 334 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 6.1
The text
As transmitted, in the capitals the NWS used until 2016.
958 WGUS41 KPHI 020645 FLWPHI BULLETIN - IMMEDIATE BROADCAST REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 245 AM EDT SAT JUN 2 2012 PAC091-021245- /O.NEW.KPHI.FA.W.0010.120602T0645Z-120602T1245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONTGOMERY PA- 245 AM EDT SAT JUN 2 2012 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLOOD WARNING FOR... NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 845 AM EDT * AT 245 AM EDT...MINOR FLOODING WAS OCCURRING ON THE UPPER PART OF THE PERKIOMEN CREEK. THE MINOR FLOODING WILL CONTINUE EARLY THIS MORNING WITH THE CREEK EXPECTED TO RETURN WITHIN ITS BANKS BY 845 AM. * WHILE RISES ARE EXPECTED ON THE LOWER PART OF THE PERKIOMEN CREEK EARLY THIS MORNING, NO FLOODING IS ANTICIPATED THERE. A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN REPORTED. DO NOT DRIVE THROUGH FLOOD WATERS, THE WATER MAY BE DEEPER THAN YOU THINK IT IS. LAT...LON 4044 7553 4033 7533 4022 7542 4033 7562 $$ IOVINO
1 follow-up statement
421 WGUS81 KPHI 021244 FLSPHI FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 844 AM EDT SAT JUN 2 2012 PAC091-021251- /O.EXP.KPHI.FA.W.0010.000000T0000Z-120602T1245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONTGOMERY PA- 844 AM EDT SAT JUN 2 2012 ...THE FLOOD WARNING WILL EXPIRE AT 845 AM EDT FOR NORTHWESTERN MONTGOMERY COUNTY... THE UPPER PART OF THE PERKIOMEN CREEK HAS RETURN WITHIN ITS BANKS...THEREFORE THE FLOOD WARNING WILL BE ALLOWED TO EXPIRE. THERE MAY STILL REMAIN WATER ON SOME LOCAL ROADWAYS OR LOW SPOTS...SO USE CAUTION WHILE DRIVING. LAT...LON 4044 7553 4033 7533 4022 7542 4033 7562 $$ ROBERTSON
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 8:46 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 5 hr |
| Jun 1, 8:58 PM EDT | Special Weather Statement | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 62 min |
| Jun 1, 9:03 PM EDT | Tornado Warning | PHI | Bucks, Montgomery | 27 min |
| Jun 1, 10:01 PM EDT | Special Weather Statement | PHI | Berks | 89 min |
| Jun 1, 11:04 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh, Montgomery | 4 hr |
| Jun 2, 12:26 AM EDT | Areal Flood Advisory | PHI | Berks, Montgomery | 85 min |
| Jun 2, 1:12 AM EDT | Areal Flood Advisory | PHI | Monroe | 3 hr |
| Jun 2, 11:28 AM EDT | Coastal Flood Advisory | PHI | Delaware, Philadelphia | 15 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.