Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 4, NWS Quad Cities, IA
NWS Quad Cities, IA issued this frost advisory at Apr 24, 2021, 2:25 PM CDT for 11 counties in Iowa; 4 counties in Illinois. It took effect at Apr 25, 2021, 12:00 AM CDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Apr 24, 2021, 2:25 PM CDT (19:25 UTC)
- In effect from
- Apr 25, 2021, 12:00 AM CDT
- Expired
- Apr 25, 2021, 8:00 AM CDT
- In force
- 8 hr
- Issued by
- NWS Quad Cities, IA
Counties Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 63 km from the middle of the area, began a volume at 19:23 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 12:00Z, 7.4 hours before the alert went out and 65 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
- 883 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
622 WWUS73 KDVN 241925 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 225 PM CDT Sat Apr 24 2021 IAZ040>042-051>054-063>066-ILZ001-002-007-009-250330- /O.NEW.KDVN.FR.Y.0004.210425T0500Z-210425T1300Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Jo Daviess-Stephenson-Carroll-Whiteside- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, Maquoketa, Marengo, Iowa City, Tipton, Clinton, Galena, Freeport, Mount Carroll, and Sterling 225 PM CDT Sat Apr 24 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM CDT SUNDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of east central and northeast Iowa and northwest Illinois. * WHEN...From midnight tonight to 8 AM CDT Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Some valley or low spots may dip just below freezing for several hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Haase www.weather.gov/dvn
2 follow-up statements
177 WWUS73 KDVN 250149 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 849 PM CDT Sat Apr 24 2021 IAZ040>042-051>054-063>066-ILZ001-002-007-009-251000- /O.CON.KDVN.FR.Y.0004.210425T0500Z-210425T1300Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Jo Daviess-Stephenson-Carroll-Whiteside- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, Maquoketa, Marengo, Iowa City, Tipton, Clinton, Galena, Freeport, Mount Carroll, and Sterling 849 PM CDT Sat Apr 24 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM CDT SUNDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of east central and northeast Iowa and northwest Illinois. * WHEN...From midnight tonight to 8 AM CDT Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. * ADDITIONAL DETAILS...Some valley or low spots may dip just below freezing for several hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
391 WWUS73 KDVN 250805 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 305 AM CDT Sun Apr 25 2021 IAZ040>042-051>054-063>066-ILZ001-002-007-009-251300- /O.CON.KDVN.FR.Y.0004.000000T0000Z-210425T1300Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Jo Daviess-Stephenson-Carroll-Whiteside- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, Maquoketa, Marengo, Iowa City, Tipton, Clinton, Galena, Freeport, Mount Carroll, and Sterling 305 AM CDT Sun Apr 25 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Temperatures as low as 28 to 32 will result in frost formation. * WHERE...Portions of east central and northeast Iowa and northwest Illinois. * WHEN...Until 8 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
Nearby
Frost Advisories in Iowa, 2021Frost Advisories in Illinois, 2021Every frost advisory in 2021
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.