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Areal Flood Warning — Montgomery County, PA, Philadelphia County, PA
Areal Flood Warning
Issued
8:45 p. m. CDT · jue., ago. 20 2026
Expires
12:45 a. m. CDT · vie., ago. 21 2026
Issuing Office
NWS KPHI

Affected Areas

Montgomery County, PA Philadelphia County, PA

Official Bulletin

885
WGUS41 KPHI 210145
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
945 PM EDT Thu Aug 20 2026

PAC091-101-210545-
/O.NEW.KPHI.FA.W.0016.260821T0145Z-260821T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery PA-Philadelphia PA-945 PM EDT Thu Aug 20 2026

...FLOOD WARNING IN EFFECT UNTIL 145 AM EDT FRIDAY...

* WHAT...Small stream flooding caused by excessive rainfall is
  expected.

* WHERE...South Central Montgomery County in southeastern
  Pennsylvania...
  Northwestern Philadelphia County in southeastern Pennsylvania...

* WHEN...Until 145 AM EDT.

* IMPACTS...Flooding of rivers, creeks, streams, and other low-lying
  and flood-prone locations is imminent or occurring. The Wissahickon
  Creek at Fort Washington is above flood stage.

* ADDITIONAL DETAILS...
  - At 945 PM EDT, Doppler radar and automated rain gauges indicated
    heavy rain due to thunderstorms. Flooding is already occurring in
    the warned area. Between 2 and 3 inches of rain have fallen.
  - Flooding impacts will continue, but no additional rainfall is
    expected.
  - Some locations that will experience flooding include...
    Ambler, Chestnut Hill, North Wales, Flourtown, Blue Bell, Fort
    Washington, Spring House and Wyndmoor.
  - 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 4007 7525 4010 7526 4016 7527 4017 7529
      4020 7531 4021 7526 4021 7522 4020 7520
      4013 7519 4005 7519 4002 7520 4004 7524

$$

Hoeflich