Alert archive / North Dakota / Frost Advisories in 2009
Frost Advisory 1, NWS Bismarck, ND
NWS Bismarck, ND issued this frost advisory at May 20, 2009, 4:05 PM CDT for 6 counties in North Dakota. It took effect at May 21, 2009, 3:00 AM CDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 20, 2009, 4:05 PM CDT (21:05 UTC)
- In effect from
- May 21, 2009, 3:00 AM CDT
- Expired
- May 21, 2009, 9:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS Bismarck, ND
Counties Burke County, ND, Divide County, ND, McKenzie County, ND, Mountrail County, ND, Renville County, ND, Williams County, ND
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 9.1 hours before the alert went out and 485 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
- 2509 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -79 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Bismarck, ND wrote its last area forecast discussion before this frost advisory went out at May 20, 3:52 PM CDT, 13 minutes earlier.
Area forecast discussion, May 20, 3:52 PM CDT, 13 minutes before
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</html>Hazardous weather outlook, May 20, 5:24 AM CDT, 10 hours 41 minutes before
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</html>Nearby
Frost Advisories in North Dakota, 2009Every frost advisory in 2009
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.