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 11, 2017, 5:27 AM CDT for 4 counties in Iowa. It was in force for 48 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 11, 2017, 5:27 AM CDT (10:27 UTC)
- Expired
- Jul 11, 2017, 6:15 AM CDT
- In force
- 48 min
- Issued by
- NWS Quad Cities, IA
Counties Iowa County, IA, Johnson County, IA, Keokuk County, IA, Washington County, IA
The radar
The Quad Cities radar (KDVN), 129 km from the middle of the area, began a volume at 10:29 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, 10.5 hours before the alert went out and 136 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
- 2871 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 1254 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
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 11, 3:33 AM CDT, 1 hour 54 minutes earlier.
Area forecast discussion, Jul 11, 3:33 AM CDT, 1 hour 54 minutes before
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</html>Hazardous weather outlook, Jul 11, 5:09 AM CDT, 18 minutes before
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 509 AM CDT Tue Jul 11 2017 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-121000- 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- 509 AM CDT Tue Jul 11 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 Thunderstorms will be possible this morning, along a stalled front south of Interstate 80. A complex of storms moving through central Iowa may impact areas along and south of Interstate 80 with damaging winds early this morning. After morning storms move east or dissipate, there will be another round of storms possible this afternoon and evening, mainly north of an Ottumwa to Galesburg line. Much like storms that occurred Monday afternoon, there will be a threat of isolated severe storms with damaging winds, large hail to the size of quarters, and isolated areas of very heavy rainfall. Flash flooding will be possible where these isolated storms form. By mid evening, the isolated storms are expected to dissipate. Another chance for storms is expected after midnight as storms in central Iowa move east. These storms will have a chance for strong wind gusts and heavy rainfall. Moist air will combine with very warm temperatures, to bring afternoon heat index readings to the 95 to 100 range today, mainly south of Interstate 80. Clouds and thunderstorms could keep temperatures lower than forecast. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Additional rounds of thunderstorms will occur Wednesday through Thursday across portions of the Outlook Area. Strong to severe storms are possible Wednesday and Wednesday night, with the primary threats being damaging winds and flooding rains. The thunderstorms are then expected to settle south along the Iowa- Missouri border region into west central Illinois on Thursday. The severe weather potential for Thursday remains uncertain at this time. Hot and humid weather will continue on Wednesday, with afternoon and early evening heat index readings of 95 to 105 degrees possible. But Wednesday will also be another day where thunderstorms and clouds may keep ambient temperatures cooler than currently expected in some locations. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible today and tonight. Ervin/12
In the hours before
Special weather statement, Jul 11, 4:00 AM CDT, 1 hour 27 minutes before
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</html>Special weather statement, Jul 11, 5:27 AM CDT, 0 minutes before
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</html>The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 7:41 PM CDT | Tornado Warning | DVN | Lee | 34 min |
| Jul 10, 8:17 PM CDT | Special Weather Statement | DVN | Lee | 58 min |
| Jul 11, 5:40 AM CDT | Severe Thunderstorm Warning | DVN | Henry, Iowa, Jefferson, Johnson, Keokuk, Washington | 50 min |
| Jul 11, 6:26 AM CDT | Special Weather Statement | DVN | Des Moines, Henry, Lee, Louisa | 49 min |
| Jul 11, 7:10 AM CDT | Special Weather Statement | DVN | Des Moines, Lee | 50 min |
| Jul 11, 11:25 AM CDT | Heat Advisory | DVN | Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more | 9 hr |
| Jul 11, 5:31 PM CDT | Special Weather Statement | DVN | Johnson | 44 min |
| Jul 11, 5:51 PM CDT | Tornado Warning | DVN | Iowa, Johnson | 39 min |
| Jul 11, 6:40 PM CDT | Special Weather Statement | DVN | Johnson | 65 min |
| Jul 10, 7:41 PM CDT | Special Weather Statement | DVN | Bureau, Putnam | 64 min |
| Jul 10, 7:53 PM CDT | Special Weather Statement | DVN | McDonough | 67 min |
| Jul 10, 8:10 PM CDT | Severe Thunderstorm Warning | DVN | McDonough | 50 min |
| Jul 10, 8:17 PM CDT | Tornado Warning | DVN | McDonough | 28 min |
| Jul 10, 8:19 PM CDT | Flash Flood Warning | DVN | McDonough, Warren | 6 hr |
| Jul 10, 8:41 PM CDT | Flash Flood Warning | DVN | Hancock | 6 hr |
| Jul 10, 9:03 PM CDT | Special Weather Statement | DVN | McDonough | 57 min |
| Jul 10, 9:13 PM CDT | Special Weather Statement | DVN | Hancock | 62 min |
| Jul 11, 7:24 AM CDT | Special Weather Statement | DVN | Hancock | 66 min |
| Jul 11, 8:15 AM CDT | Special Weather Statement | DVN | Putnam | 45 min |
| Jul 11, 8:29 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 31 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.