Alert archive / Montana / Snow Advisories in 2008
Snow Advisory 21, NWS Billings, MT
NWS Billings, MT issued this snow advisory at Apr 19, 2008, 3:57 PM MDT for 5 counties in Montana. It took effect at Apr 19, 2008, 9:26 PM MDT. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Apr 19, 2008, 3:57 PM MDT (21:57 UTC)
- In effect from
- Apr 19, 2008, 9:26 PM MDT
- Expired
- Apr 20, 2008, 3:31 PM MDT
- In force
- 18 hr
- Issued by
- NWS Billings, MT
Counties Carbon County, MT, Golden Valley County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT
The radar
The Billings radar (KBLX), 80 km from the middle of the area, began a volume at 22:01 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
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.0 hours before the alert went out and 360 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
- 1132 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this snow 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 snow advisory went out at Apr 19, 3:27 PM MDT, 30 minutes earlier.
Area forecast discussion, Apr 19, 3:27 PM MDT, 30 minutes before
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</html>Hazardous weather outlook, Apr 19, 3:51 PM MDT, 6 minutes before
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<div class="status" id="status">Temporary Notice</div>
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The site you requested is temporarily down for maintenance or an unexpected outage.
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</html>The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 9:41 AM MDT | Red Flag Warning | BYZ | Big Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more | 11 hr |
| Apr 19, 3:57 PM MDT | Heavy Snow Warning | BYZ | Carbon, Park, Stillwater, Sweet Grass, Wheatland | 24 hr |
| Apr 19, 3:57 PM MDT | Snow and Blowing Snow Advisory | BYZ | Golden Valley, Wheatland | 24 hr |
Nearby
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.