Alert archive / Iowa / Freeze Warnings in 2021
Freeze Warning 4, NWS Quad Cities, IA
NWS Quad Cities, IA issued this freeze warning at Oct 31, 2021, 2:22 PM CDT for 7 counties in Illinois; 8 counties in Iowa. It took effect at Nov 1, 2021, 12:00 AM CDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 31, 2021, 2:22 PM CDT (19:22 UTC)
- In effect from
- Nov 1, 2021, 12:00 AM CDT
- Expired
- Nov 1, 2021, 9:00 AM CDT
- In force
- 9 hr
- Issued by
- NWS Quad Cities, IA
Counties Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Bureau County, IL, Henderson County, IL, Henry County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Warren County, IL
The radar
The Quad Cities radar (KDVN), 51 km from the middle of the area, began a volume at 19:25 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 55 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
- 810 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
774 WWUS73 KDVN 311922 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 222 PM CDT Sun Oct 31 2021 IAZ067-068-ILZ015>018-010330- /O.NEW.KDVN.FZ.W.0004.211101T0500Z-211101T1400Z/ Muscatine-Scott-Rock Island-Henry IL-Bureau-Putnam- Including the cities of Muscatine, Davenport, Bettendorf, Moline, Rock Island, Geneseo, Princeton, and Hennepin 222 PM CDT Sun Oct 31 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT MONDAY... * WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...In Iowa, Muscatine and Scott Counties. In Illinois, Rock Island, Henry IL, Bureau and Putnam Counties. * WHEN...From midnight tonight to 9 AM CDT Monday. * 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. && $$ www.weather.gov/dvn
3 follow-up statements
371 WWUS73 KDVN 010118 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 818 PM CDT Sun Oct 31 2021 IAZ076>078-087>089-ILZ024>026-011100- /O.EXA.KDVN.FZ.W.0004.211101T0500Z-211101T1400Z/ Keokuk-Washington-Louisa-Jefferson-Henry IA-Des Moines-Mercer- Henderson-Warren- Including the cities of Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Aledo, Oquawka, and Monmouth 818 PM CDT Sun Oct 31 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT MONDAY... * WHAT...Temperatures in the lower 30s. * WHERE...In Iowa, Keokuk, Washington, Louisa, Jefferson, Henry IA and Des Moines Counties. In Illinois, Mercer, Henderson and Warren Counties. * WHEN...From midnight tonight to 9 AM CDT Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation, and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ IAZ067-068-ILZ015>018-011100- /O.CON.KDVN.FZ.W.0004.211101T0500Z-211101T1400Z/ Muscatine-Scott-Rock Island-Henry IL-Bureau-Putnam- Including the cities of Muscatine, Davenport, Bettendorf, Moline, Rock Island, Geneseo, Princeton, and Hennepin 818 PM CDT Sun Oct 31 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT MONDAY... * WHAT...Temperatures in the lower 30s. * WHERE...In Iowa, Muscatine and Scott Counties. In Illinois, Rock Island, Henry IL, Bureau and Putnam Counties. * WHEN...From midnight tonight to 9 AM CDT Monday. * 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. && $$ www.weather.gov/dvn Uttech
151 WWUS73 KDVN 010724 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 224 AM CDT Mon Nov 1 2021 IAZ067-068-076>078-087>089-ILZ015>018-024>026-011400- /O.CON.KDVN.FZ.W.0004.000000T0000Z-211101T1400Z/ Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-Henry IA- Des Moines-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren- Including the cities of Muscatine, Davenport, Bettendorf, Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, and Monmouth 224 AM CDT Mon Nov 1 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... * WHAT...Temperatures in the lower 30s. * WHERE...In Iowa, Muscatine and Scott Counties. In Illinois, Rock Island, Henry IL, Bureau and Putnam Counties. * WHEN...From midnight tonight to 9 AM CDT Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation, and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
537 WWUS73 KDVN 011402 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 902 AM CDT Mon Nov 1 2021 IAZ067-068-076>078-087>089-ILZ015>018-024>026-011515- /O.EXP.KDVN.FZ.W.0004.000000T0000Z-211101T1400Z/ Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-Henry IA- Des Moines-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren- Including the cities of Muscatine, Davenport, Bettendorf, Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka, and Monmouth 902 AM CDT Mon Nov 1 2021 ...FREEZE WARNING HAS EXPIRED... Temperatures are warming above freezing and the threat for frost and freeze is ending. Thus, the Freeze Warning was allowed to expire at 9 AM CDT. $$ www.weather.gov/dvn
Nearby
Freeze Warnings in Iowa, 2021Freeze Warnings in Illinois, 2021Every freeze warning 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.