Alert archive / Montana / Wind Advisories in 2018
Wind Advisory 16, NWS Billings, MT
NWS Billings, MT issued this wind advisory at Dec 20, 2018, 2:42 AM MST for Park County, Stillwater County, Sweet Grass County, Montana. It took effect at Dec 20, 2018, 2:00 PM MST. It was in force for 16 hr.
The area
The counties it named.
The facts
- Issued
- Dec 20, 2018, 2:42 AM MST (09:42 UTC)
- In effect from
- Dec 20, 2018, 2:00 PM MST
- Expired
- Dec 21, 2018, 6:16 AM MST
- In force
- 16 hr
- Issued by
- NWS Billings, MT
Counties Park County, MT, Stillwater County, MT, Sweet Grass County, MT
The radar
The Billings radar (KBLX), 107 km from the middle of the area, began a volume at 09:42 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
Riverton, WY (KRIW), launched 00:00Z, 9.7 hours before the alert went out and 313 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2191 m above ground
- 0-6 km bulk shear
- 91 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this wind advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Billings, MT wrote its last area forecast discussion before this wind advisory went out at Dec 19, 8:34 PM MST, 6 hours 8 minutes earlier.
Area forecast discussion, Dec 19, 8:34 PM MST, 6 hours 8 minutes before
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</html>Hazardous weather outlook, Dec 19, 3:20 PM MST, 11 hours 22 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.