Alert archive / Illinois / Special Weather Statements in 2017
Special Weather Statement, NWS Quad Cities, IA
NWS Quad Cities, IA issued this special weather statement at Jul 10, 2017, 3:52 AM CDT for Scott County, Iowa; Henry County, Rock Island County, Whiteside County, Illinois. It was in force for 53 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 10, 2017, 3:52 AM CDT (08:52 UTC)
- Expired
- Jul 10, 2017, 4:45 AM CDT
- In force
- 53 min
- Issued by
- NWS Quad Cities, IA
Counties Scott County, IA, Henry County, IL, Rock Island County, IL, Whiteside County, IL
The radar
The Quad Cities radar (KDVN), 33 km from the middle of the area, began a volume at 08:54 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, 8.9 hours before the alert went out and 26 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
- 475 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1980 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 10, 2:10 AM CDT, 1 hour 42 minutes earlier.
Area forecast discussion, Jul 10, 2:10 AM CDT, 1 hour 42 minutes before
Area Forecast Discussion National Weather Service Quad Cities IA IL 210 AM CDT Mon Jul 10 2017 .SYNOPSIS... Issued at 136 AM CDT Mon Jul 10 2017 A large MCS continue to move southeast through IA/MN/WI as of 1 AM. The two main focusing mechanisms appear to be a warm advection wing near 700mb over central to southeast WI, and another band of intense updrafts at the edge of the cap, from south central MN to near Fort Dodge. The southern flank of this will impact our area through 15Z with heavy rain, and possibly damaging winds and hail. && .SHORT TERM...(Today and Tonight) ISSUED AT 136 AM CDT Mon Jul 10 2017 The forecast for today will focus on timing out the morning storms, and increasing the heat and humidity. The front is expected to be north of the CWA today, and with the expected rainfall this morning, we should see a very humid day take place. By late morning, clearing should occur in most areas, with heat index readings near 90 north to near 100 south. This is near advisory, but with the uncertainty of storm/cloud evolution, will not issue any heat related headlines on this shift. The cap that is is holding over southwest Iowa will advect northeast today, making the prospect for additional surface based storms in our area a very low confidence outlook. There is a low chance an isolated storm could fire in the south today on outflow convergence, and if it did, a strong storm would be likely. ERVIN .LONG TERM...(Tuesday through Sunday) ISSUED AT 136 AM CDT Mon Jul 10 2017 Hot and humid weather will continue through Thursday, with low confidence chance for showers and thunderstorms. The air mass will remain very moist, and storms will carry a locally heavy rain threat when the occur. As of now, the hottest day appears to be Wednesday which continues to show potential for a heat advisory during the afternoon and evening hours, when heat indexes reach the 95 to 103 range. By Thursday, the front is expected to move south, shifting the heat threat away from the region, at least for a day. By Friday and Saturday, another cool front will approach from the north, with temperatures rebounding back to the upper 80s, and a return to the upper 60s. A low chance for storms is included for the upcoming front, which does not appear to be strongly forced at this time. ERVIN && .AVIATION...(For the 06Z TAFS through 06Z Monday Night) ISSUED AT 1155 PM CDT Sun Jul 9 2017 Latest upstream radar trends support slightly slower timing for overnight storms at KCID/KDBQ/KMLI. Still some uncertainty as to the eventual intensity of winds and have toned them down slightly. Mainly MVFR ceilings and periods of IFR visibilities will likely accompany the storms, with a period of MVFR ceilings lingering into Monday morning. The chance of showers and storms is low at KBRL. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && SYNOPSIS...Ervin SHORT TERM...Ervin LONG TERM...Ervin AVIATION...RP Kinney
Hazardous weather outlook, Jul 9, 8:10 PM CDT, 7 hours 42 minutes before
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 810 PM CDT Sun Jul 9 2017 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-110115- 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- 810 PM CDT Sun Jul 9 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...TONIGHT The Storm Prediction Center has an enhanced risk for severe thunderstorms along the Highway 20 corridor during the overnight hours. A slight risk extends southward to include the Interstate 80 corridor, with a marginal risk as far south as southeast Iowa and western Illinois. A line of severe thunderstorms, with bowing segments producing swaths of very damaging winds, is expected to push into the northern half of the outlook area mainly after midnight. Damaging winds of up to 70 mph, with swaths of around 80 mph appears likely, especially in the enhanced risk area. Backbuilding or repeating thunderstorms over generally the same area in the wake of the intense bow echo will produce torrential rainfall, with amounts of several inches in a short time possible. Any areas that receive this amount of rain may lead to flash flooding and rapid rises on creeks and streams. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY The Storm Prediction Center has a slight risk of severe thunderstorms Monday afternoon, east of a Carthage to Aledo Illinois line. A marginal risk exists for the remainder of the outlook area. Thunderstorms will continue to be possible, as a stalled front remains over the area through Thursday. There will be a threat for heavy rainfall, as well as damaging winds from occasional rounds of storms during this period. At this time, the timing of the periods of storms are not certain, but the main threat does appear to be heavy rain rates and eventual flooding. Very moist air will combine with hot temperatures, to bring afternoon heat index readings to the 95 to 105 range Monday through Wednesday. Locations along and south of Interstate 80 are most at risk for the intense heat, as clouds and thunderstorms could offset the heat farther north. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed between 12 am and 7 am early Monday morning, mainly along and north of Interstate 80. Haase/RP Kinney
In the hours before
Special weather statement, Jul 10, 2:07 AM CDT, 1 hour 45 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
207 AM CDT MON JUL 10 2017
IAC019-055-061-105-113-100800-
Buchanan-Dubuque-Jones-Delaware-Linn-
207 AM CDT MON JUL 10 2017
...STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN BUCHANAN...
DUBUQUE...NORTHERN JONES...DELAWARE AND NORTHEASTERN LINN COUNTIES
UNTIL 300 AM CDT...
At 205 AM CDT, a cluster of strong thunderstorms were located near
Dundee, or near Manchester, moving southeast at 40 mph.
Wind gusts up to 50 mph and dime size hail are possible with these
storms as they pass by.
Locations impacted include...
Dubuque, Manchester, Asbury, Dyersville, Monticello, Cascade,
Epworth, Farley, Peosta, Edgewood, Earlville, Coggon, Hopkinton,
Delhi, New Vienna, Colesburg, Worthington, Holy Cross, Ryan and
Greeley.
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 4261 9069 4258 9068 4230 9084 4229 9090
4218 9090 4210 9094 4232 9173 4265 9154
4265 9112
TIME...MOT...LOC 0705Z 290DEG 36KT 4256 9147
12Local storm report, Jul 10, 2:56 AM CDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
256 AM CDT MON JUL 10 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0247 AM HAIL HIAWATHA 42.05N 91.68W
07/10/2017 E0.25 INCH LINN IA BROADCAST MEDIA
TIME ESTIMATED FROM RADAR.
&&
GROSSSpecial weather statement, Jul 10, 3:52 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
352 AM CDT MON JUL 10 2017
ILC011-015-073-131-161-195-IAC045-163-100945-
Rock Island-Mercer-Whiteside-Henry-Carroll-Bureau-Scott-Clinton-
352 AM CDT MON JUL 10 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT ROCK ISLAND...
NORTHEASTERN MERCER...WHITESIDE...HENRY...SOUTHEASTERN CARROLL...
NORTHWESTERN BUREAU...CENTRAL SCOTT AND EASTERN CLINTON COUNTIES
UNTIL 445 AM CDT...
At 351 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Savanna to near Blue Grass. Movement
was southeast at 40 mph.
Wind gusts up to 50 mph are possible with these storms.
Locations impacted include...
Davenport, Moline, Rock Island, Bettendorf, Clinton, East Moline,
Sterling, Rock Falls, Morrison, Cambridge, Mount Carroll, Silvis,
Geneseo, Eldridge, Milan, Colona, Camanche, Le Claire, Coal Valley
and Fulton.
This includes the following highways...
Interstate 74 in Iowa between mile markers 1 and 5.
Interstate 80 in Iowa between mile markers 290 and 306.
Interstate 80 in Illinois between mile markers 1 and 36.
Interstate 74 in Illinois between mile markers 1 and 33.
Interstate 88 between mile markers 1 and 44.
Interstate 280 between mile markers 1 and 18.
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 4115 9012 4115 9039 4150 9079 4152 9078
4203 9021 4203 9016 4207 9017 4214 9009
4189 8963 4158 8962
TIME...MOT...LOC 0851Z 317DEG 36KT 4205 9011 4153 9070
12The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 2:07 AM CDT | Special Weather Statement | DVN | Delaware, Dubuque | 53 min |
| Jul 10, 2:42 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Dubuque, Jackson, Jones | 50 min |
| Jul 10, 4:32 AM CDT | Special Weather Statement | DVN | Des Moines, Henry, Louisa, Muscatine, Washington | 58 min |
| Jul 10, 4:48 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa | 42 min |
| Jul 10, 5:15 AM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Louisa, Washington | 27 min |
| Jul 10, 2:20 PM CDT | Heat Advisory | DVN | Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 5 more | 5 hr |
| Jul 10, 4:41 PM CDT | Special Weather Statement | DVN | Scott | 64 min |
| Jul 10, 6:05 PM CDT | Special Weather Statement | DVN | Lee | 40 min |
| Jul 10, 6:38 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Lee | 67 min |
| Jul 10, 5:21 AM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson, McDonough, Warren | 54 min |
| Jul 10, 6:11 AM CDT | Special Weather Statement | DVN | Putnam | 34 min |
| Jul 10, 7:25 AM CDT | Special Weather Statement | DVN | Hancock, McDonough | 65 min |
| Jul 10, 6:10 PM CDT | Special Weather Statement | DVN | McDonough | 35 min |
Nearby
Special Weather Statements in Illinois, 2017Special 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.