Alert archive / Pennsylvania / Areal Flood Warnings in 2015
Areal Flood Warning 13, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Mar 14, 2015, 12:39 PM 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
- Mar 14, 2015, 12:39 PM EDT (16:39 UTC)
- Expired
- Mar 14, 2015, 6:30 PM 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), 106 km from the middle of the area, began a volume at 16:42 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, 4.7 hours before the alert went out and 227 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
- 524 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 454 m²/s²
- 0-3 km storm-relative helicity
- 563 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
853 WGUS41 KPHI 141639 FLWPHI BULLETIN - IMMEDIATE BROADCAST REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1239 PM EDT SAT MAR 14 2015 PAC091-142230- /O.NEW.KPHI.FA.W.0013.150314T1639Z-150314T2230Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONTGOMERY PA- 1239 PM EDT SAT MAR 14 2015 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * FLOOD WARNING FOR... NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA... * UNTIL 630 PM EDT * AT 1233 PM EDT...HEAVY RAIN IS CAUSING RISES IN THE PERKIOMEN CREEK IN MONTGOMERY COUNTY. THE PERKIOMEN CREEK AT EAST GREENVILLE IS WITHIN HALF A FOOT OF FLOOD STAGE AND STILL RISING. IT SHOULD REACH FLOOD STAGE BY MID AFTERNOON. THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...MOLASSES CREEK... WEST BRANCH PERKIOMEN CREEK...SCHLEGEL RUN...UNAMI CREEK...MACOBY CREEK...PERKIOMEN CREEK...HOSENSACK CREEK AND STONY RUN. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...AS WELL AS FARM AND SOME ROADS. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. && LAT...LON 4044 7553 4038 7543 4032 7549 4037 7559 $$ KLINE
1 follow-up statement
768 WGUS81 KPHI 142141 FLSPHI FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 541 PM EDT SAT MAR 14 2015 PAC091-142148- /O.CAN.KPHI.FA.W.0013.000000T0000Z-150314T2230Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONTGOMERY PA- 541 PM EDT SAT MAR 14 2015 ...THE FLOOD WARNING FOR NORTHWESTERN MONTGOMERY COUNTY IS CANCELLED... THE HEAVY RAIN HAS ENDED...PERKIOMEN CREEK HAS CRESTED AND IS EXPECTED TO CONTINUE TO FALL. THEREFORE...FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. LAT...LON 4044 7553 4038 7543 4032 7549 4037 7559 $$ SFJ
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 14, 10:44 AM EDT | Areal Flood Warning | PHI | Chester | 6 hr |
| Mar 14, 11:12 AM EDT | River Flood Warning | PHI | Chester | 18 hr |
Nearby
Areal Flood Warnings in Pennsylvania, 2015Every areal flood warning in 2015
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.