Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Quad Cities, IA

July 3, 2017Muscatine County, Iowa

NWS Quad Cities, IA issued this special weather statement at Jul 3, 2017, 3:07 PM CDT for Muscatine 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
Jul 3, 2017, 3:07 PM CDT (20:07 UTC)
Expired
Jul 3, 2017, 3:30 PM CDT
In force
23 min
Issued by
NWS Quad Cities, IA

County Muscatine County, IA

The radar

The Quad Cities radar (KDVN), 61 km from the middle of the area, began a volume at 20:09 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 12:00Z, 8.1 hours before the alert went out and 67 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2017-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 153 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2017-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
153 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
1305 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 3, 2:51 PM CDT, 16 minutes earlier.

Area forecast discussion, Jul 3, 2:51 PM CDT, 16 minutes before
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Hazardous weather outlook, Jul 3, 3:24 AM CDT, 11 hours 43 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
324 AM CDT Mon Jul 3 2017

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-040830-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
324 AM CDT Mon Jul 3 2017

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...TODAY AND TONIGHT

Isolated thunderstorms are possible this afternoon and evening
mainly along and north of Interstate 80. The main threat from
these storms would be lightning and heavy rain. At this time, no
severe weather is anticipated.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Tuesday through Wednesday...there is a chance for thunderstorms.
Conditions remain unfavorable for a severe risk due to limited
instability. Most rain totals will be spotty and light to moderate
in intensity and amounts, resulting in a low risk of heavy rains
producing water issues.

Friday...there is another chance for thunderstorms with the next
disturbance and frontal system. It is too early to assess a
severe risk at this time. However, overall instability appears to
be modest which tends to not support a significant severe threat
at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

Gibbs/Nichols

In the hours before

Special weather statement, Jul 3, 12:21 PM CDT, 2 hours 46 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
1221 PM CDT MON JUL 3 2017

IAC045-031745-
Clinton-
1221 PM CDT MON JUL 3 2017

...A STRONG THUNDERSTORM WILL AFFECT EASTERN CLINTON COUNTY UNTIL
1245 PM CDT...

At 1220 PM CDT, a strong thunderstorm was located near Charlotte, or
11 miles northwest of Clinton, moving southeast at 20 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Clinton, Camanche, Charlotte, Low Moor, Goose Lake, Bryant, Clinton
Municipal Airport and Elvira.

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 4191 9015 4188 9017 4185 9018 4176 9031
      4193 9056 4203 9042 4203 9035
TIME...MOT...LOC 1720Z 315DEG 17KT 4195 9041

ERVIN
Local storm report, Jul 3, 1:27 PM CDT, 1 hour 40 minutes before
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Special weather statement, Jul 3, 2:24 PM CDT, 43 minutes before
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Special weather statement, Jul 3, 2:26 PM CDT, 41 minutes before
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Special weather statement, Jul 3, 3:07 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 12:21 PM CDTSpecial Weather StatementDVNClinton24 min
Jul 3, 2:26 PM CDTSpecial Weather StatementDVNCedar49 min
Jul 3, 2:24 PM CDTSpecial Weather StatementDVNWhiteside36 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.