Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 3, NWS Quad Cities, IA
NWS Quad Cities, IA issued this frost advisory at Apr 19, 2021, 11:47 PM CDT for 11 counties in Iowa; Carroll County, Jo Daviess County, Stephenson County, Illinois. It took effect at Apr 20, 2021, 12:00 AM CDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Apr 19, 2021, 11:47 PM CDT (04:47 UTC)
- In effect from
- Apr 20, 2021, 12:00 AM CDT
- Expired
- Apr 20, 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
The radar
The Quad Cities radar (KDVN), 68 km from the middle of the area, began a volume at 04:47 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, 4.8 hours before the alert went out and 71 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
- 1610 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
290 WWUS73 KDVN 200447 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 1147 PM CDT Mon Apr 19 2021 IAZ040>042-051>054-063>066-ILZ001-002-007-201300- /O.NEW.KDVN.FR.Y.0003.210420T0500Z-210420T1300Z/ /O.CON.KDVN.FZ.W.0001.210421T0500Z-210421T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Jo Daviess-Stephenson-Carroll- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, Maquoketa, Marengo, Iowa City, Tipton, Clinton, Galena, Freeport, and Mount Carroll 1147 PM CDT Mon Apr 19 2021 ...FROST ADVISORY IN EFFECT UNTIL 8 AM CDT TUESDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TUESDAY NIGHT TO 9 AM CDT WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures in the mid to upper 20s. For the Frost Advisory, temperatures as low as 30 will result in frost formation. * WHERE...Portions of east central and northeast Iowa and northwest Illinois. * WHEN...For the Freeze Warning, from midnight Tuesday night to 9 AM CDT Wednesday. For the Frost Advisory, until 8 AM CDT Tuesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ IAZ067-068-076>078-087>089-098-099-ILZ009-015>018-024>026-034-035- MOZ009-010-201300- /O.CON.KDVN.FZ.W.0001.210421T0500Z-210421T1400Z/ Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-Henry IA- Des Moines-Van Buren-Lee-Whiteside-Rock Island-Henry IL-Bureau- Putnam-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Muscatine, Davenport, Bettendorf, Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 1147 PM CDT Mon Apr 19 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TUESDAY NIGHT TO 9 AM CDT WEDNESDAY... * WHAT...Sub-freezing temperatures in the mid to upper 20s. * WHERE...Portions of northeast Missouri, east central and southeast Iowa and north central, northwest and west central Illinois. * WHEN...From midnight Tuesday night to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ www.weather.gov/dvn
2 follow-up statements
752 WWUS73 KDVN 200828 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 328 AM CDT Tue Apr 20 2021 IAZ040>042-051>054-063>066-ILZ001-002-007-201630- /O.CON.KDVN.FZ.W.0001.210421T0500Z-210421T1400Z/ /O.CON.KDVN.FR.Y.0003.000000T0000Z-210420T1300Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Jo Daviess-Stephenson-Carroll- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, Maquoketa, Marengo, Iowa City, Tipton, Clinton, Galena, Freeport, and Mount Carroll 328 AM CDT Tue Apr 20 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT WEDNESDAY... * WHAT...For the Freeze Warning, sub-freezing temperatures in the mid to upper 20s. For the Frost Advisory, temperatures in the lower 30s will result in frost formation. * WHERE...Portions of east central and northeast Iowa and northwest Illinois. * WHEN...For the Freeze Warning, from midnight tonight to 9 AM CDT Wednesday. For the Frost Advisory, until 8 AM CDT this morning. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ IAZ067-068-076>078-087>089-098-099-ILZ009-015>018-024>026-034-035- MOZ009-010-201630- /O.CON.KDVN.FZ.W.0001.210421T0500Z-210421T1400Z/ Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-Henry IA- Des Moines-Van Buren-Lee-Whiteside-Rock Island-Henry IL-Bureau- Putnam-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Muscatine, Davenport, Bettendorf, Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 328 AM CDT Tue Apr 20 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT WEDNESDAY... * WHAT...Sub-freezing temperatures in the upper 20s. * WHERE...Portions of northeast Missouri, east central and southeast Iowa and north central, northwest and west central Illinois. * WHEN...From midnight tonight to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ www.weather.gov/dvn
634 WWUS73 KDVN 201258 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 758 AM CDT Tue Apr 20 2021 IAZ040>042-051>054-063>066-ILZ001-002-007-202100- /O.EXP.KDVN.FR.Y.0003.000000T0000Z-210420T1300Z/ /O.CON.KDVN.FZ.W.0001.210421T0500Z-210421T1400Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Jo Daviess-Stephenson-Carroll- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Anamosa, Maquoketa, Marengo, Iowa City, Tipton, Clinton, Galena, Freeport, and Mount Carroll 758 AM CDT Tue Apr 20 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT WEDNESDAY... ...FROST ADVISORY WILL EXPIRE AT 8 AM CDT THIS MORNING... * WHAT...Sub-freezing temperatures in the mid to upper 20s. * WHERE...Portions of east central and northeast Iowa and northwest Illinois. * WHEN...From midnight tonight to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ IAZ067-068-076>078-087>089-098-099-ILZ009-015>018-024>026-034-035- MOZ009-010-202100- /O.CON.KDVN.FZ.W.0001.210421T0500Z-210421T1400Z/ Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-Henry IA- Des Moines-Van Buren-Lee-Whiteside-Rock Island-Henry IL-Bureau- Putnam-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Muscatine, Davenport, Bettendorf, Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 758 AM CDT Tue Apr 20 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT WEDNESDAY... * WHAT...Sub-freezing temperatures in the mid to upper 20s. * WHERE...Portions of northeast Missouri, east central and southeast Iowa and north central, northwest and west central Illinois. * WHEN...From midnight tonight to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ 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.