Alert archive / Illinois / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 59, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 15, 2021, 12:05 AM CDT for Stephenson County, Illinois. It was in force for 25 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 15, 2021, 12:05 AM CDT (05:05 UTC)
- Expired
- Jul 15, 2021, 12:30 AM CDT
- In force
- 25 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Stephenson County, IL
The radar
The Milwaukee radar (KMKX), 107 km from the middle of the area, began a volume at 05:04 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 15, 12:15 AM CDT | TSTM WND DMG | 1 Sse Freeport, IL | AT LEAST ONE TREE REPORTED TO BE BLOWN DOWN IN FREEPORT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 5.1 hours before the alert went out and 112 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
- 2569 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 253 m²/s²
- 0-3 km storm-relative helicity
- 346 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 23.4
The text
As transmitted.
477 WUUS53 KDVN 150505 SVRDVN ILC177-150530- /O.NEW.KDVN.SV.W.0059.210715T0505Z-210715T0530Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Quad Cities IA/IL 1205 AM CDT Thu Jul 15 2021 The National Weather Service in the Quad Cities has issued a * Severe Thunderstorm Warning for... Central Stephenson County in northwestern Illinois... * Until 1230 AM CDT. * At 1205 AM CDT, a severe thunderstorm was located over Freeport, moving east at 50 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * This severe thunderstorm will be near... Dakota and German Valley around 1215 AM CDT. Rock City and Ridott around 1220 AM CDT. Davis around 1225 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Large hail and damaging winds and continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4247 8940 4220 8940 4220 8978 4241 8981 TIME...MOT...LOC 0505Z 258DEG 42KT 4229 8968 HAIL...<.75IN WIND...60MPH $$ Gibbs
1 follow-up statement
943 WWUS53 KDVN 150519 SVSDVN Severe Weather Statement National Weather Service Quad Cities IA/IL 1219 AM CDT Thu Jul 15 2021 ILC177-150530- /O.CON.KDVN.SV.W.0059.000000T0000Z-210715T0530Z/ Stephenson IL- 1219 AM CDT Thu Jul 15 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR EASTERN STEPHENSON COUNTY... At 1218 AM CDT, a severe thunderstorm was located over Ridott, or 8 miles east of Freeport, moving east at 50 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of eastern Stephenson County, including the following locations... Scioto Mills, Red Oak, Winneshiek, Dakota Dornink Airport, Damascus, Albertus Airport, Stephenson County Fairgrounds, Afolkey and Lake Summerset. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a sturdy building. Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4247 8940 4220 8940 4220 8969 4242 8972 TIME...MOT...LOC 0518Z 258DEG 42KT 4232 8947 HAIL...<.75IN WIND...60MPH $$ Gibbs
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 11:10 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess | 50 min |
| Jul 14, 11:41 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson | 34 min |
| Jul 15, 12:07 AM CDT | Severe Thunderstorm Warning | DVN | Carroll, Whiteside | 23 min |
| Jul 15, 1:01 AM CDT | Special Weather Statement | DVN | Rock Island | 89 min |
| Jul 15, 1:51 PM CDT | Special Weather Statement | DVN | McDonough | 39 min |
| Jul 15, 2:31 PM CDT | Special Weather Statement | DVN | McDonough | 29 min |
| Jul 15, 5:23 PM CDT | Special Weather Statement | DVN | Whiteside | 37 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2021Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.