Calamity
mediumSevere weatherCalamity Score: 52

Severe weather near Morristown

MorrisUnited StatesNOAA

This alert expired on 8 August 2026 at 00:05 UTC. It is kept here as a record.

It is the 14th strongest of the 120 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 29 more were recorded here in the fortnight before it.

What the source measured

NOAA reported: Flash Flood Warning issued August 7 at 7:55PM EDT until August 7 at 8:00PM EDT by NWS Mount Holly NJ

An estimated 21,337,021 people live within 50 km of this point.

Nearby, since 12 March 2026

How we know

Confirmed by 56 independent sources, including NOAA.

Our own score for this event is 52 out of 100, at 87 % confidence.

The score is ours, computed from intensity, exposed population and local history — not the source’s.

Event Data

TypeSevere weather
Severitymedium
Calamity Score (ours)52 / 100
Our confidence87%
Coordinates40.7829, -74.4580
Nearest CityMorristown (3 km)
Population Exposed21.3M within 50 km
Impact Tiersignificant
Timestamp2026-08-07T23:55:00.000Z
Sourcehttps://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.8a8071cf6954a4a36b1aec4a381e5849

Score Breakdown

35
intensity
100
population
0
cascading
80
historical

Technical Details

EventFlash Flood Warning
UrgencyImmediate
CertaintyLikely
AreaDescHunterdon, NJ; Morris, NJ; Sussex, NJ; Warren, NJ; Sussex, NJ; Warren, NJ; Monroe, PA; Northampton, PA; Monmouth, NJ and 7 more areas
HeadlineFlash Flood Warning issued August 7 at 7:55PM EDT until August 7 at 8:00PM EDT by NWS Mount Holly NJ
Expires2026-08-07T20:05:00-04:00
SenderNameNWS Mount Holly NJ
HasExactCoordstrue
MergedCount10
MergedIds["noaa_urn:oid:2.49.0.1.840.0.8a8071cf6954a4a36b1aec4a381e58497fb1206c.001.1","noaa_urn:oid:2.49.0.1.840.0.c5589d996e9e7c3ec7af5736cf40664c50d4fc41.001.1","noaa_urn:oid:2.49.0.1.840.0.be0037f1be48ccda76148b1d0ff925aa43db69d5.001.1","noaa_urn:oid:2.49.0.1.840.0.5d91568fd362c6503ff72913d79d7627f4eed9d2.001.1","noaa_urn:oid:2.49.0.1.840.0.0e2e32df2833601ec04af4bc33f2ed3de642ff51.001.1","noaa_urn:oid:2.49.0.1.840.0.89ea341664c82fcc85ced12b7c025fb661385d05.001.1","noaa_urn:oid:2.49.0.1.840.0.36286183260c107d047cd56ec7f0fe8927237f46.001.1","noaa_urn:oid:2.49.0.1.840.0.3b08cfe49cdaacf2aaf88982001e207a578af414.001.1","noaa_urn:oid:2.49.0.1.840.0.4e758e7e7f3c8bb089bafdf4bf8d9d749deb9ffd.001.1","noaa_urn:oid:2.49.0.1.840.0.00f1876b158b2605b030e9efc78f7513996266cf.001.1"]
Iem TypeSummaryM
Iem Magnitude48
Iem UnitMPH
Iem City1 S Mamaroneck
Iem CountyANZ335
Iem StateNY
Iem WfoOKX
Iem RemarkMesonet station XLAR Larchmont Harbor.
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Safety Information

During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.

Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.

This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.

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Calamity.live data shows a weather event with CalamityScore 52/100, near Morristown (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.