Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 9, NWS Quad Cities, IA
NWS Quad Cities, IA issued this frost advisory at Oct 21, 2021, 3:24 AM CDT for 7 counties in Iowa. It took effect at Oct 22, 2021, 1:00 AM CDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Oct 21, 2021, 3:24 AM CDT (08:24 UTC)
- In effect from
- Oct 22, 2021, 1:00 AM CDT
- Expired
- Oct 22, 2021, 9:00 AM CDT
- In force
- 8 hr
- Issued by
- NWS Quad Cities, IA
Counties Benton County, IA, Buchanan County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Jones County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 104 km from the middle of the area, began a volume at 08:26 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
Davenport, (KDVN), launched 00:00Z, 8.4 hours before the alert went out and 109 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
- 284 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 1025 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 172 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.4
The text
As transmitted.
066 WWUS73 KDVN 210824 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 324 AM CDT Thu Oct 21 2021 IAZ040>042-051-052-063-211630- /O.NEW.KDVN.FR.Y.0009.211022T0600Z-211022T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, and Marengo 324 AM CDT Thu Oct 21 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Buchanan, Delaware, Dubuque, Benton, Linn and Iowa Counties. * WHEN...From 1 AM to 9 AM CDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
5 follow-up statements
505 WWUS73 KDVN 211505 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 1005 AM CDT Thu Oct 21 2021 IAZ040>042-051-052-063-212315- /O.CON.KDVN.FR.Y.0009.211022T0600Z-211022T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, and Marengo 1005 AM CDT Thu Oct 21 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Buchanan, Delaware, Dubuque, Benton, Linn and Iowa Counties. * WHEN...From 1 AM to 9 AM CDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
842 WWUS73 KDVN 211941 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 241 PM CDT Thu Oct 21 2021 IAZ040>042-051-052-063-220345- /O.CON.KDVN.FR.Y.0009.211022T0600Z-211022T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, and Marengo 241 PM CDT Thu Oct 21 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * WHAT...Temperatures as low as 33 will likely result in frost formation. * WHERE...Buchanan, Delaware, Dubuque, Benton, Linn and Iowa Counties. * WHEN...From 1 AM to 9 AM CDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
726 WWUS73 KDVN 220016 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 716 PM CDT Thu Oct 21 2021 IAZ053-221000- /O.EXA.KDVN.FR.Y.0009.211022T0600Z-211022T1400Z/ Jones- Including the city of Anamosa 716 PM CDT Thu Oct 21 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * WHAT...Temperatures in the low to mid 30s will lead to areas of frost. * WHERE...Jones County. * WHEN...From 1 AM to 9 AM CDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ IAZ040>042-051-052-063-221000- /O.CON.KDVN.FR.Y.0009.211022T0600Z-211022T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, and Marengo 716 PM CDT Thu Oct 21 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * WHAT...Temperatures in the low to mid 30s will lead to areas of frost. * WHERE...Buchanan, Delaware, Dubuque, Benton, Linn and Iowa Counties. * WHEN...From 1 AM to 9 AM CDT Friday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn Uttech
568 WWUS73 KDVN 220753 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 253 AM CDT Fri Oct 22 2021 IAZ040>042-051>053-063-221400- /O.CON.KDVN.FR.Y.0009.000000T0000Z-211022T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Iowa- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, and Marengo 253 AM CDT Fri Oct 22 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... * WHAT...Temperatures in the low to mid 30s will lead to areas of frost. * WHERE...Iowa, Benton, Buchanan, Jones, Delaware, Linn and Dubuque Counties. * WHEN...Until 9 AM CDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn Gross
255 WWUS73 KDVN 221353 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 853 AM CDT Fri Oct 22 2021 IAZ040>042-051>053-063-221500- /O.EXP.KDVN.FR.Y.0009.000000T0000Z-211022T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Iowa- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, and Marengo 853 AM CDT Fri Oct 22 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM CDT THIS MORNING... Overnight temperatures fell to as low as 32 in many place, allowing for patchy frost. As of 9 AM, temperatures have risen above 36, ending the threat for frost. There will likely be more frost tonight. $$ www.weather.gov/dvn
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.