# Extreme Heat Warning: District of Columbia; Frederick; Carroll; Northern Baltimore; Cecil; Southern Baltimore; Prince Georges; Anne Arundel; Charles; St. Marys; Calvert; Northwest Montgomery; Central and Southeast Montgomery; Northwest Howard; Central and Southeast Howard; Northwest Harford; Southeast Harford; Nelson; Albemarle; Greene; Madison; Rappahannock; Orange; Culpeper; Fairfax; Arlington/Falls Church/Alexandria; Stafford; Spotsylvania; King George; Northern Fauquier; Southern Fauquier; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park — retained record

> Retained us-gov-api record from us-gov-api:noaa-weather.

Canonical: https://highsignal.app/data/records/93277a7f44dfa469

[← sources](https://highsignal.app/data)


source: [us-gov-api](https://highsignal.app/data/us-gov-api) (us-gov-api:noaa-weather)  published 2026-07-04 00:47 ingested 2026-07-04 08:43

[original source ↗](http://www.weather.gov/)

## extract

Extreme Heat Warning — District of Columbia; Frederick; Carroll; Northern Baltimore; Cecil; Southern Baltimore; Prince Georges; Anne Arundel; Charles; St. Marys; Calvert; Northwest Montgomery; Central and Southeast Montgomery; Northwest Howard; Central and Southeast Howard; Northwest Harford; Southeast Harford; Nelson; Albemarle; Greene; Madison; Rappahannock; Orange; Culpeper; Fairfax; Arlington/Falls Church/Alexandria; Stafford; Spotsylvania; King George; Northern Fauquier; Southern Fauquier; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park
Severity: Severe. Certainty: Likely.
* WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values 110 to 115 expected.

* WHERE...Washington DC, and portions of central, north central,
northeast, northern, and southern Maryland, and central, northern,
and northwest Virginia.

* WHEN...From 10 AM this morning to 9 PM EDT this evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.

* ADDITIONAL DETAILS...Early morning low temperatures in the 70s and
80s combined with oppressive humidity will result in little to no
overnight relief. Prolonged excessive heat may impact power,
water, and transportation systems. Heat index values around 100 to
104 are possible again Sunday afternoon.

## retained text

The historical document was shared with another weather alert and cannot be attributed to this record. The original extract is preserved above; the exact alert link was not retained.