Alert archive / New Hampshire / Heat Advisories in 2021

Heat Advisory 5, NWS Gray, ME

June 29, 20215 counties in Maine; 7 counties in New Hampshire

NWS Gray, ME issued this heat advisory at Jun 29, 2021, 2:30 PM EDT for 5 counties in Maine; 7 counties in New Hampshire. It took effect at Jun 30, 2021, 11:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jun 29, 2021, 2:30 PM EDT (18:30 UTC)
In effect from: Jun 30, 2021, 11:00 AM EDT
Expired: Jun 30, 2021, 6:00 PM EDT
In force: 7 hr
Issued by: NWS Gray, ME

Counties Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Sagadahoc County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 67 km from the middle of the area, began a volume at 18:32 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

Gray, ME (KGYX), launched 12:00Z, 6.5 hours before the alert went out and 66 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 342 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1242 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

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 Gray, ME wrote its last area forecast discussion before this heat advisory went out at Jun 29, 1:00 PM EDT, 1 hour 30 minutes earlier.

Area forecast discussion, Jun 29, 1:00 PM EDT, 1 hour 30 minutes before

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Hazardous weather outlook, Jun 29, 10:08 AM EDT, 4 hours 22 minutes before

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The office that day

Everything else NWS Gray, ME issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 9:47 PM EDT	Special Weather Statement	GYX	Waldo	28 min
Jun 28, 8:11 PM EDT	Special Weather Statement	GYX	Belknap	34 min
Jun 29, 5:41 PM EDT	Special Weather Statement	GYX	Grafton	34 min
Jun 29, 6:12 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Grafton, Merrimack	33 min

Nearby

Heat Advisories in New Hampshire, 2021 Heat Advisories in Maine, 2021 Every 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.