Alert archive / Iowa / Special Weather Statements in 2017
Special Weather Statement, NWS Quad Cities, IA
NWS Quad Cities, IA issued this special weather statement at Jul 7, 2017, 1:38 AM CDT for Benton County, Iowa County, Linn County, Iowa. It was in force for 67 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
- Jul 7, 2017, 1:38 AM CDT (06:38 UTC)
- Expired
- Jul 7, 2017, 2:45 AM CDT
- In force
- 67 min
- Issued by
- NWS Quad Cities, IA
Counties Benton County, IA, Iowa County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 125 km from the middle of the area, began a volume at 06:37 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, 6.6 hours before the alert went out and 131 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
- 1175 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1720 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 186 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 5.4
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Jul 6, 11:35 PM CDT, 2 hours 3 minutes earlier.
Area forecast discussion, Jul 6, 11:35 PM CDT, 2 hours 3 minutes before
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</html>Hazardous weather outlook, Jul 6, 8:33 PM CDT, 5 hours 5 minutes before
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<div class="status" id="status">Temporary Notice</div>
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</html>In the hours before
Special weather statement, Jul 7, 1:06 AM CDT, 32 minutes before
Special Weather Statement National Weather Service Quad Cities IA/IL 106 AM CDT FRI JUL 7 2017 IAC011-070645- Benton- 106 AM CDT FRI JUL 7 2017 ...A STRONG THUNDERSTORM WILL AFFECT BENTON COUNTY UNTIL 145 AM CDT... At 106 AM CDT, a strong thunderstorm was located over Dysart, or 13 miles west of Vinton, moving east at 30 mph. Wind gusts up to 50 mph and nickel size hail are possible with this storm. Locations impacted include... Vinton, Atkins, Urbana, Dysart, Shellsburg, Newhall, Van Horne, Keystone, Garrison, Vinton Memorial Airport, Rodgers Park, Benton City Park, Hoefle-Dulin Park, Benton County Fairgrounds and Wildcat Bluff Park. This includes Interstate 380 between mile markers 40 and 42. 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. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. LAT...LON 4224 9230 4223 9183 4193 9183 4201 9230 TIME...MOT...LOC 0606Z 277DEG 31KT 4215 9229 12
Special weather statement, Jul 7, 1:38 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
138 AM CDT FRI JUL 7 2017
IAC011-095-103-113-070745-
Johnson-Benton-Linn-Iowa-
138 AM CDT FRI JUL 7 2017
...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN
JOHNSON...BENTON...SOUTHERN LINN AND IOWA COUNTIES UNTIL 245 AM
CDT...
At 135 AM CDT, radar indicated a group of strong thunderstorms
located from near Vinton to near Ladora. Movement was east at 25 mph.
Wind gusts up to 50 mph and dime size hail are possible with these
storms. Move indoors as these storms approach your area.
Locations impacted include...
Cedar Rapids, Vinton, Marengo, Marion, Hiawatha, Robins,
Williamsburg, Belle Plaine, Center Point, Fairfax, Tiffin, Ely,
Atkins, Walford, Palo, Shellsburg, Victor, Swisher, Newhall and
Oxford.
This includes the following highways...
Interstate 80 in Iowa between mile markers 208 and 236.
Interstate 380 between mile markers 6 and 36.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4188 9230 4220 9212 4215 9142 4157 9177
4171 9230
TIME...MOT...LOC 0635Z 279DEG 21KT 4212 9207 4179 9226
12The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 1:06 AM CDT | Special Weather Statement | DVN | Benton | 39 min |
| Jul 7, 2:43 AM CDT | Special Weather Statement | DVN | Washington | 62 min |
| Jul 7, 3:38 AM CDT | Special Weather Statement | DVN | Des Moines, Lee | 37 min |
| Jul 7, 3:58 AM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson, McDonough, Warren | 49 min |
| Jul 7, 4:57 AM CDT | Special Weather Statement | DVN | Hancock | 33 min |
Nearby
Special Weather Statements in Iowa, 2017Every special weather statement in 2017
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.