Alert archive / Maryland / Heat Advisories in 2021
Heat Advisory 3, NWS Baltimore/Washington
NWS Baltimore/Washington issued this heat advisory at Jul 16, 2021, 2:57 PM EDT for 10 counties in Maryland. It took effect at Jul 17, 2021, 12:00 PM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2021, 2:57 PM EDT (18:57 UTC)
- In effect from
- Jul 17, 2021, 12:00 PM EDT
- Expired
- Jul 17, 2021, 7:00 PM EDT
- In force
- 7 hr
- Issued by
- NWS Baltimore/Washington
Counties Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD, Prince George's County, MD, Saint Mary's County, MD
The radar
The Sterling radar (KLWX), 78 km from the middle of the area, began a volume at 18:56 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.0 hours before the alert went out and 70 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1491 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this heat advisory went out at Jul 16, 2:45 PM EDT, 12 minutes earlier.
Area forecast discussion, Jul 16, 2:45 PM EDT, 12 minutes before
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</html>Hazardous weather outlook, Jul 16, 5:04 AM EDT, 9 hours 53 minutes before
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</html>Nearby
Heat Advisories in Maryland, 2021Every heat advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.