Alert archive / Illinois / Special Weather Statements in 2021
Special Weather Statement, NWS Quad Cities, IA
NWS Quad Cities, IA issued this special weather statement at Jun 18, 2021, 2:21 AM CDT for Stephenson County, Illinois. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2021, 2:21 AM CDT (07:21 UTC)
- Expired
- Jun 18, 2021, 2:45 AM CDT
- In force
- 24 min
- Issued by
- NWS Quad Cities, IA
County Stephenson County, IL
The radar
The Milwaukee radar (KMKX), 107 km from the middle of the area, began a volume at 07:22 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, 7.4 hours before the alert went out and 113 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
- 1531 J/kg
- Mixed-layer CIN
- -220 J/kg
- Mixed-layer LCL
- 1979 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
475 WWUS83 KDVN 180721 SPSDVN Special Weather Statement National Weather Service Quad Cities IA/IL 221 AM CDT Fri Jun 18 2021 ILC177-180745- Stephenson- 221 AM CDT Fri Jun 18 2021 ...A STRONG THUNDERSTORM WILL AFFECT STEPHENSON COUNTY UNTIL 245 AM CDT... At 221 AM CDT, a strong thunderstorm was located near Cedarville, or 8 miles northwest of Freeport, moving east at 60 mph. Winds in excess of 30 mph and pea size hail are possible with this storm. Locations impacted include... Freeport, Lena, Pearl City, Cedarville, Davis, Dakota, German Valley, Winslow, Rock City, Ridott, Buena Vista, Rock Grove, Oneco, Orangeville, Eleroy, Damascus, Lake Le-Aqua- na State Park, Mc Connell, Scioto Mills and Winneshiek. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4250 8940 4220 8940 4220 8991 4251 8985 TIME...MOT...LOC 0721Z 277DEG 52KT 4240 8969 $$ Ervin
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:01 AM CDT | Special Weather Statement | DVN | Dubuque | 44 min |
| Jun 18, 9:39 AM CDT | Special Weather Statement | DVN | Lee | 36 min |
| Jun 18, 9:59 AM CDT | Special Weather Statement | DVN | Lee | 31 min |
| Jun 18, 4:17 AM CDT | Special Weather Statement | DVN | Henry, Rock Island | 43 min |
| Jun 18, 4:51 AM CDT | Special Weather Statement | DVN | Rock Island | 39 min |
Nearby
Special Weather Statements in Illinois, 2021Every special weather statement 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.