Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 7, NWS Quad Cities, IA
NWS Quad Cities, IA issued this frost advisory at May 11, 2021, 2:26 PM CDT for 19 counties in Iowa; 12 counties in Illinois. It took effect at May 12, 2021, 1:00 AM CDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 11, 2021, 2:26 PM CDT (19:26 UTC)
- In effect from
- May 12, 2021, 1:00 AM CDT
- Expired
- May 12, 2021, 7:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS Quad Cities, IA
All 31 counties
Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 28 km from the middle of the area, began a volume at 19:28 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 35 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
- 15 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1155 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
638 WWUS73 KDVN 111926 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 226 PM CDT Tue May 11 2021 IAZ053-054-065>068-078-089-ILZ001-002-007-009-015>018-024>026-035- 120330- /O.NEW.KDVN.FR.Y.0007.210512T0600Z-210512T1200Z/ Jones-Jackson-Cedar-Clinton-Muscatine-Scott-Louisa-Des Moines- Jo Daviess-Stephenson-Carroll-Whiteside-Rock Island-Henry IL- Bureau-Putnam-Mercer-Henderson-Warren-McDonough- Including the cities of Anamosa, Maquoketa, Tipton, Clinton, Muscatine, Davenport, Bettendorf, Wapello, Burlington, Galena, Freeport, Mount Carroll, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, and Macomb 226 PM CDT Tue May 11 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 7 AM CDT WEDNESDAY... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of east central and southeast Iowa and north central, northwest and west central Illinois. * WHEN...From 1 AM to 7 AM CDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ IAZ040>042-051-052-063-064-076-077-087-088-120330- /O.NEW.KDVN.FR.Y.0007.210512T0700Z-210512T1200Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa-Johnson-Keokuk- Washington-Jefferson-Henry IA- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Marengo, Iowa City, Sigourney, Washington, Fairfield, and Mount Pleasant 226 PM CDT Tue May 11 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 7 AM CDT WEDNESDAY... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of east central, northeast and southeast Iowa. * WHEN...From 2 AM to 7 AM CDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
3 follow-up statements
393 WWUS73 KDVN 120241 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 941 PM CDT Tue May 11 2021 IAZ053-054-065>068-078-089-ILZ001-002-007-009-015>018-024>026-035- 121045- /O.CON.KDVN.FR.Y.0007.210512T0600Z-210512T1200Z/ Jones-Jackson-Cedar-Clinton-Muscatine-Scott-Louisa-Des Moines- Jo Daviess-Stephenson-Carroll-Whiteside-Rock Island-Henry IL- Bureau-Putnam-Mercer-Henderson-Warren-McDonough- Including the cities of Anamosa, Maquoketa, Tipton, Clinton, Muscatine, Davenport, Bettendorf, Wapello, Burlington, Galena, Freeport, Mount Carroll, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, and Macomb 941 PM CDT Tue May 11 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 7 AM CDT WEDNESDAY... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of east central and southeast Iowa and north central, northwest and west central Illinois. * WHEN...From 1 AM to 7 AM CDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ IAZ040>042-051-052-063-064-076-077-087-088-121045- /O.CON.KDVN.FR.Y.0007.210512T0700Z-210512T1200Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa-Johnson-Keokuk- Washington-Jefferson-Henry IA- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Marengo, Iowa City, Sigourney, Washington, Fairfield, and Mount Pleasant 941 PM CDT Tue May 11 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 7 AM CDT WEDNESDAY... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of east central, northeast and southeast Iowa. * WHEN...From 2 AM to 7 AM CDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
308 WWUS73 KDVN 120740 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 240 AM CDT Wed May 12 2021 IAZ053-054-065>068-078-089-ILZ001-002-007-009-015>018-024>026-035- 121200- /O.CON.KDVN.FR.Y.0007.000000T0000Z-210512T1200Z/ Jones-Jackson-Cedar-Clinton-Muscatine-Scott-Louisa-Des Moines- Jo Daviess-Stephenson-Carroll-Whiteside-Rock Island-Henry IL- Bureau-Putnam-Mercer-Henderson-Warren-McDonough- Including the cities of Anamosa, Maquoketa, Tipton, Clinton, Muscatine, Davenport, Bettendorf, Wapello, Burlington, Galena, Freeport, Mount Carroll, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, and Macomb 240 AM CDT Wed May 12 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM CDT THIS MORNING... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of east central and southeast Iowa and north central, northwest and west central Illinois. * WHEN...From 1 AM to 7 AM CDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ IAZ040>042-051-052-063-064-076-077-087-088-121200- /O.CON.KDVN.FR.Y.0007.000000T0000Z-210512T1200Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa-Johnson-Keokuk- Washington-Jefferson-Henry IA- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Marengo, Iowa City, Sigourney, Washington, Fairfield, and Mount Pleasant 240 AM CDT Wed May 12 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM CDT THIS MORNING... * WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Portions of east central, northeast and southeast Iowa. * WHEN...From 2 AM to 7 AM CDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
444 WWUS73 KDVN 121156 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 656 AM CDT Wed May 12 2021 IAZ053-054-065>068-078-089-ILZ001-002-007-009-015>018-024>026-035- 121300- /O.EXP.KDVN.FR.Y.0007.000000T0000Z-210512T1200Z/ Jones-Jackson-Cedar-Clinton-Muscatine-Scott-Louisa-Des Moines- Jo Daviess-Stephenson-Carroll-Whiteside-Rock Island-Henry IL- Bureau-Putnam-Mercer-Henderson-Warren-McDonough- Including the cities of Anamosa, Maquoketa, Tipton, Clinton, Muscatine, Davenport, Bettendorf, Wapello, Burlington, Galena, Freeport, Mount Carroll, Sterling, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, Monmouth, and Macomb 656 AM CDT Wed May 12 2021 ...FROST ADVISORY WILL EXPIRE AT 7 AM CDT THIS MORNING... Temperatures will quickly climb through the 40s this morning, ending any threat for frost. $$ IAZ040>042-051-052-063-064-076-077-087-088-121300- /O.EXP.KDVN.FR.Y.0007.000000T0000Z-210512T1200Z/ Buchanan-Delaware-Dubuque-Benton-Linn-Iowa-Johnson-Keokuk- Washington-Jefferson-Henry IA- Including the cities of Independence, Manchester, Dubuque, Vinton, Cedar Rapids, Marengo, Iowa City, Sigourney, Washington, Fairfield, and Mount Pleasant 656 AM CDT Wed May 12 2021 ...FROST ADVISORY WILL EXPIRE AT 7 AM CDT THIS MORNING... Temperatures will quickly climb through the 40s this morning, ending any threat for frost. $$ 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.