Missouri, 2018

Excessive Heat in Missouri, July 1, 2018

July 1, 2018 · NWS LSX · 2 events in 2 counties and zones

A dangerous combination of heat and humidity overspread the region beginning on June 28th and persisted through July 1st. There were 37 heat related illnesses reported in St.

Where it happened

Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
7
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LSX wrote it up.

A dangerous combination of heat and humidity overspread the region beginning on June 28th and persisted through July 1st. There were 37 heat related illnesses reported in St. Louis County & the City of St. Louis during this event.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before the first event at Jun 30, 11:09 PM CST, 51 minutes earlier.

Area forecast discussion, Jun 30, 11:09 PM CST, 51 minutes before
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Hazardous weather outlook, Jun 30, 10:13 PM CST, 1 hour 47 minutes before
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The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

2 excessive heat. Local standard time, as filed.

Excessive Heat, St. Louis

When
July 1, 12:00 AM CST to 5:00 PM CST
Where
St. Louis forecast zone
Injuries
3 direct, 0 indirect
Reported by
ASOS
Coordinates
38.641, -90.443 (the zone’s center; the record gives no point)

High temperatures were in the mid 90s with heat index values 106 or higher.

Excessive Heat, St. Louis (C)

When
July 1, 12:00 AM CST to 5:00 PM CST
Where
St. Louis (C) forecast zone
Injuries
4 direct, 0 indirect
Reported by
ASOS
Coordinates
38.627, -90.198 (the zone’s center; the record gives no point)

High temperatures were in the mid 90s with heat index values 106 or higher.

What these are

Excessive Heat
Heat at or above the local excessive heat warning criteria, or heat that caused deaths.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Missouri in 2018Every state in 2018This day in weather historyWarnings in Missouri, July 2018

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 771599, 771600.