Alert archive / Montana / Heat Advisories in 2021
Heat Advisory 7, NWS Glasgow, MT
NWS Glasgow, MT issued this heat advisory at Aug 15, 2021, 2:32 PM MDT for 7 counties in Montana. It took effect at Aug 16, 2021, 12:00 PM MDT. It was in force for 32 hr.
The area
The counties it named.
The facts
- Issued
- Aug 15, 2021, 2:32 PM MDT (20:32 UTC)
- In effect from
- Aug 16, 2021, 12:00 PM MDT
- Expired
- Aug 17, 2021, 8:09 PM MDT
- In force
- 32 hr
- Issued by
- NWS Glasgow, MT
Counties Dawson County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Prairie County, MT, Richland County, MT, Wibaux County, MT
The radar
The Glasgow radar (KGGW), 123 km from the middle of the area, began a volume at 20:33 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 8.5 hours before the alert went out and 385 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
- 901 J/kg
- Mixed-layer CIN
- -333 J/kg
- Mixed-layer LCL
- 1859 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 72 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 Glasgow, MT wrote its last area forecast discussion before this heat advisory went out at Aug 14, 4:39 PM MDT, 21 hours 53 minutes earlier.
Area forecast discussion, Aug 14, 4:39 PM MDT, 21 hours 53 minutes before
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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.