Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 6, NWS Des Moines, IA
NWS Des Moines, IA issued this frost advisory at Oct 15, 2021, 1:08 PM CDT for 25 counties in Iowa. It took effect at Oct 16, 2021, 2:00 AM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Oct 15, 2021, 1:08 PM CDT (18:08 UTC)
- In effect from
- Oct 16, 2021, 2:00 AM CDT
- Expired
- Oct 16, 2021, 9:00 AM CDT
- In force
- 7 hr
- Issued by
- NWS Des Moines, IA
All 25 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Taylor County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 83 km from the middle of the area, began a volume at 18:06 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
Omaha, NE (KOAX), launched 12:00Z, 6.1 hours before the alert went out and 201 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
- 1566 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- -71 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
607 WWUS73 KDMX 151808 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 108 PM CDT Fri Oct 15 2021 IAZ004-015-023-033-034-044-045-057-160215- /O.NEW.KDMX.FR.Y.0006.211016T0700Z-211016T1400Z/ Emmet-Palo Alto-Pocahontas-Sac-Calhoun-Crawford-Carroll-Audubon- Including the cities of Estherville, Emmetsburg, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Denison, Carroll, Audubon, and Exira 108 PM CDT Fri Oct 15 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM CDT SATURDAY... * WHAT...Temperatures falling into the mid 30s will result in frost formation. * WHERE...West Central and Northwest Iowa. * WHEN...From 2 AM to 9 AM CDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines CURTIS
1 follow-up statement
407 WWUS73 KDMX 160140 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 840 PM CDT Fri Oct 15 2021 IAZ005>007-016-017-024-025-035-036-046-047-058-059-070-071-081- 092-160945- /O.EXA.KDMX.FR.Y.0006.211016T0700Z-211016T1400Z/ Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-Humboldt-Wright- Webster-Hamilton-Greene-Boone-Guthrie-Dallas-Cass-Adair-Adams- Taylor- Including the cities of Algona, Forest City, Lake Mills, Northwood, Manly, Garner, Britt, Kanawha, Mason City, Clear Lake, Humboldt, Eagle Grove, Clarion, Belmond, Fort Dodge, Webster City, Jefferson, Boone, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Corning, Bedford, Lenox, and New Market 840 PM CDT Fri Oct 15 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM CDT SATURDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Western and Northern Iowa. * WHEN...From 2 AM to 9 AM CDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Krull IAZ004-015-023-033-034-044-045-057-160945- /O.CON.KDMX.FR.Y.0006.211016T0700Z-211016T1400Z/ Emmet-Palo Alto-Pocahontas-Sac-Calhoun-Crawford-Carroll-Audubon- Including the cities of Estherville, Emmetsburg, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Denison, Carroll, Audubon, and Exira 840 PM CDT Fri Oct 15 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM CDT SATURDAY... * WHAT...Temperatures falling into the mid 30s will result in frost formation. * WHERE...West Central and Northwest Iowa. * WHEN...From 2 AM to 9 AM CDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Krull For more information from the National Weather Service visit https://weather.gov/desmoines
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.