Alert archive / Iowa / Special Weather Statements in 2018
Special Weather Statement, NWS Quad Cities, IA
NWS Quad Cities, IA issued this special weather statement at Aug 7, 2018, 5:21 PM CDT for Van Buren County, Iowa. It was in force for 39 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
- Aug 7, 2018, 5:21 PM CDT (22:21 UTC)
- Expired
- Aug 7, 2018, 6:00 PM CDT
- In force
- 39 min
- Issued by
- NWS Quad Cities, IA
County Van Buren County, IA
The radar
The Quad Cities radar (KDVN), 149 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 155 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
- 600 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 632 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
275 WWUS83 KDVN 072221 SPSDVN Special Weather Statement National Weather Service Quad Cities IA/IL 521 PM CDT TUE AUG 7 2018 IAC101-177-072300- Van Buren-Jefferson- 521 PM CDT TUE AUG 7 2018 ...A STRONG THUNDERSTORM WILL AFFECT WESTERN VAN BUREN AND SOUTHWESTERN JEFFERSON COUNTIES UNTIL 600 PM CDT... At 521 PM CDT, a strong thunderstorm was located near Douds, or 13 miles southwest of Fairfield, moving southeast at 25 mph. Winds in excess of 40 mph and dime size hail are possible with this storm. Locations impacted include... Keosauqua, Birmingham, Libertyville, Stockport, Douds, Leando, Van Buren County Fairgrounds, Keosauqua Airport, Mount Zion, Selma, Lebanon, Collett, Lake Sugema Campground, Lacey Keosauqua State Park and Kilbourn. Torrential rainfall is also occurring with this storm, and may cause localized flooding. Do not drive your vehicle through flooded roadways. 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. Persons in campgrounds should consider seeking sturdy shelter until this storm passes. LAT...LON 4099 9218 4091 9181 4066 9196 4077 9218 TIME...MOT...LOC 2221Z 294DEG 17KT 4089 9217 $$ 12
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 10:00 PM CDT | Special Weather Statement | DVN | Henry, Jefferson, Van Buren | 45 min |
| Aug 6, 10:11 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson | 37 min |
| Aug 7, 1:28 PM CDT | Special Weather Statement | DVN | Jones | 17 min |
| Aug 7, 5:13 PM CDT | Special Weather Statement | DVN | Benton | 32 min |
| Aug 7, 5:51 PM CDT | Special Weather Statement | DVN | Benton, Linn | 54 min |
| Aug 7, 12:59 PM CDT | Special Weather Statement | DVN | Whiteside | 31 min |
| Aug 6, 7:08 PM CDT | Special Weather Statement | DVN | Scotland | 22 min |
Nearby
Special Weather Statements in Iowa, 2018Every special weather statement in 2018
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.