Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Quad Cities, IA

April 10, 2017Iowa County, Iowa

NWS Quad Cities, IA issued this special weather statement at Apr 10, 2017, 1:07 AM CDT for Iowa County, Iowa. It was in force for 23 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: Apr 10, 2017, 1:07 AM CDT (06:07 UTC)
Expired: Apr 10, 2017, 1:30 AM CDT
In force: 23 min
Issued by: NWS Quad Cities, IA

County Iowa County, IA

The radar

The Quad Cities radar (KDVN), 131 km from the middle of the area, began a volume at 06:09 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, 6.1 hours before the alert went out and 138 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 443 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

039 
WWUS83 KDVN 100607
SPSDVN

Special Weather Statement
National Weather Service Quad Cities IA/IL
107 AM CDT MON APR 10 2017

IAC095-107-100630-
Keokuk-Iowa-
107 AM CDT MON APR 10 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN KEOKUK AND SOUTHERN
IOWA COUNTIES UNTIL 130 AM CDT...

At 105 AM CDT, a strong thunderstorm was located near What Cheer, or
9 miles southeast of Montezuma, moving east at 50 mph.

Wind gusts up to 50 mph and nickel size hail are possible with this
storm.

Locations impacted include...
Williamsburg, North English, What Cheer, Keswick, Parnell, 
Millersburg, Kinross, Webster, Thornburg, Gibson, and Holbrook.

This includes Interstate 80 in Iowa between mile markers 222 and 229.
 
LAT...LON 4151 9241 4151 9230 4161 9230 4172 9183
      4151 9183 4151 9195 4147 9195 4140 9241
TIME...MOT...LOC 0605Z 256DEG 57KT 4150 9237 

$$

08

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 10, 1:31 AM CDT	Special Weather Statement	DVN	Iowa	29 min
Apr 10, 1:43 AM CDT	Severe Thunderstorm Warning	DVN	Johnson	32 min
Apr 10, 1:57 AM CDT	Severe Thunderstorm Warning	DVN	Jones, Linn	33 min
Apr 10, 2:13 AM CDT	Special Weather Statement	DVN	Cedar	32 min
Apr 10, 2:31 AM CDT	Special Weather Statement	DVN	Jackson	44 min
Apr 10, 3:08 AM CDT	Special Weather Statement	DVN	Lee	22 min
Apr 10, 3:34 AM CDT	Special Weather Statement	DVN	Des Moines	26 min
Apr 10, 3:53 AM CDT	Special Weather Statement	DVN	Lee	22 min
Apr 10, 4:17 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines	43 min
Apr 10, 5:13 AM CDT	Special Weather Statement	DVN	Van Buren	32 min
Apr 10, 12:20 PM CDT	Special Weather Statement	DVN	Cedar	25 min
Apr 10, 12:21 PM CDT	Special Weather Statement	DVN	Muscatine	9 min
Apr 10, 2:44 AM CDT	Special Weather Statement	DVN	Mercer, Rock Island	61 min
Apr 10, 2:45 AM CDT	Special Weather Statement	DVN	Stephenson	30 min
Apr 10, 3:11 AM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	34 min
Apr 10, 3:30 AM CDT	Special Weather Statement	DVN	Stephenson	45 min
Apr 10, 3:37 AM CDT	Special Weather Statement	DVN	Bureau	23 min
Apr 10, 3:56 AM CDT	Special Weather Statement	DVN	Mercer	34 min
Apr 10, 4:44 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	12 min
Apr 10, 5:06 AM CDT	Special Weather Statement	DVN	Putnam	24 min
Apr 10, 10:56 AM CDT	Special Weather Statement	DVN	Warren	19 min
Apr 10, 11:55 AM CDT	Special Weather Statement	DVN	Putnam	20 min
Apr 10, 1:01 PM CDT	Special Weather Statement	DVN	Putnam	14 min
Apr 10, 1:59 PM CDT	Special Weather Statement	DVN	McDonough	31 min
Apr 10, 2:19 PM CDT	Severe Thunderstorm Warning	DVN	McDonough	12 min
Apr 10, 4:37 PM CDT	Special Weather Statement	DVN	Putnam	38 min
Apr 10, 5:45 AM CDT	Special Weather Statement	DVN	Clark	30 min

Nearby

Special Weather Statements in Iowa, 2017 Every 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.