Enter any address in Montgomery County, Pennsylvania to see its FEMA flood zone
Flash flooding from slow-moving weather systems is the dominant flood character in Montgomery County. Over the past 30 years, NOAA Storm Events data shows 192 flash flood events and 71 flood events. For example, a slow-moving cold front produced heavy rain and flash flooding across portions of the region in July 2025, an event that repeated due to the same weather pattern. Another instance in July 2025 saw an approaching cold front spark showers and thunderstorms, resulting in flash flooding.
National Flood Insurance Program (NFIP) claims data indicates that properties designated as Zone A have experienced the highest number of claims, with an average payout of $34,622 and an average water depth of 5.2 feet. Zone X areas also show significant claim activity. Homeowners in Zone A, and those in other designated flood zones, should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
40 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Montgomery County, Pennsylvania has recorded 265 flood-related events since 1996 according to NOAA's Storm Events Database, including 192 flash floods and 71 river or area floods. The county has received 29 federal disaster declarations, 7 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1965–2021)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Remnants Of Hurricane Ida | Hurricane | Aug 31, 2021 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Winter Storm And Snowstorm | Snowstorm | Jan 22, 2016 |
| Severe Winter Storm | Severe Ice Storm | Feb 4, 2014 |
| Hurricane Sandy | Hurricane | Oct 26, 2012 |
| Remnants Of Tropical Storm Lee | Flood | Sep 3, 2011 |
| Tropical Storm Lee | Flood | Sep 3, 2011 |
| Hurricane Irene | Hurricane | Aug 26, 2011 |
| Severe Winter Storms And Snowstorms | Snowstorm | Feb 5, 2010 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | May 31, 2025 | 0.00K |
| Flash Flood | Jul 31, 2025 | 25.00K |
| Flash Flood | Jul 31, 2025 | 30.00K |
| Flash Flood | May 16, 2025 | 0.00K |
| Flash Flood | Jul 14, 2025 | 0.00K |
| Flash Flood | Jul 9, 2025 | 0.00K |
| Flash Flood | Jul 1, 2025 | 0.00K |
| Flood | Jan 10, 2024 | 0.00K |
| Flood | Dec 28, 2023 | 0.00K |
| Flash Flood | Jun 27, 2023 | 0.00K |
Flash Flood — May 31, 2025
Thunderstorms, in the vicinity a cold front, produced flash flooding.
Flash Flood — Jul 31, 2025
A stationary front sparked off showers and thunderstorms across the forecast area. Flash flooding resulted.
Flash Flood — May 16, 2025
Scattered thunderstorms developed along a slow moving warm front.
Flash Flood — Jul 14, 2025
An approaching cold front sparked off showers and thunderstorms across the forecast area. Flash flooding resulted.
Flash Flood — Jul 9, 2025
A slow-moving cold front produced heavy rain and flash flooding across portions of the region. This is the same front that caused flash flooding the day prior.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Montgomery County, Pennsylvania:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Montgomery County, Pennsylvania that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.