Alert archive / Illinois / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 118, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 12, 2007, 1:44 AM CDT for Stephenson County, Illinois. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 12, 2007, 1:44 AM CDT (06:44 UTC)
- Expired
- Aug 12, 2007, 2:45 AM CDT
- In force
- 61 min
- Issued by
- NWS Quad Cities, IA
- Area
- Counties, with a storm outline in the text
County Stephenson County, IL
The radar
The Quad Cities radar (KDVN), 112 km from the middle of the area, began a volume at 06:44 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, 6.7 hours before the alert went out and 107 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
- 1137 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 1520 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.9
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 11, 2:45 PM CDT, 10 hours 59 minutes earlier.
Area forecast discussion, Aug 11, 2:45 PM CDT, 10 hours 59 minutes before
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</html>Hazardous weather outlook, Aug 11, 5:03 AM CDT, 20 hours 41 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 503 AM CDT SAT AUG 11 2007 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-121015- 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- 503 AM CDT SAT AUG 11 2007 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... TEMPERATURES IN THE LOW TO MID 90S AND INCREASING HUMIDITY TODAY WILL COMBINE TO PRODUCE HEAT INDICES OF AROUND 100 DEGREES IN PORTIONS OF SOUTHEAST IOWA...FAR WEST CENTRAL ILLINOIS AND NORTHEAST MISSOURI. A FRONTAL SYSTEM WILL DROP SOUTH TOWARD THE DUBUQUE...TO CEDAR RAPIDS AREA BY LATE TONIGHT. OUT AHEAD OF IT...THERE WILL BE A CHANCE FOR SOME THUNDERSTORMS THIS EVENING AND OVERNIGHT GENERALLY ALONG AND NORTH OF A LINE FROM WEST OF CEDAR RAPIDS... TO FREEPORT IN NORTHWEST ILLINOIS. IF STORMS DO MANAGE TO GET DOWN INTO THESE AREAS TONIGHT...THERE WILL BE A LOW CHANCE THAT A FEW STORMS WILL PRODUCE DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... SUNDAY THE COLD FRONT CONTINUES TO MOVE SOUTHEAST ACROSS THE OUTLOOK AREA IN THE MORNING. BY THIS TIME NO STORMS ARE EXPECTED IN THE FORECAST AREA...THOUGH ISOLATED CELLS ARE POSSIBLE CLOSE TO THE BOUNDARY. A SECOND FRONT IS EXPECTED TO MOVE THROUGH THE AREA ON TUESDAY WITH LOW CHANCES OF SHOWERS AND THUNDERSTORMS. LATER IN THE WEEK...SHOWERS AND THUNDERSTORMS ARE EXPECTED LATE TUESDAY NIGHT THROUGH WEDNESDAY AND WEDNESDAY NIGHT. IT IS TOO EARLY TO DETERMINE THE POTENTIAL FOR SEVERE WEATHER OR HEAVY RAINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
In the hours before
Special weather statement, Aug 12, 1:40 AM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 140 AM CDT SUN AUG 12 2007 ILZ001-002-120815- JO DAVIESS-STEPHENSON- INCLUDING THE CITIES OF...GALENA...FREEPORT 140 AM CDT SUN AUG 12 2007 ...A LINE OF STRONG THUNDERSTORMS PUSHING OUT OF SOUTHERN WISCONSIN AND INTO NORTHWEST ILLINOIS... A LINE OF STRONG THUNDERSTORMS WILL MOVE QUICKLY SOUTHEAST OUT OF SOUTHERN WISCONSIN AND REACH A STOCKTON...TO FREEPORT LINE BY 220 AM. THESE STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS UP TO 50 MPH...FREQUENT AND INTENSE CLOUD TO GROUND LIGHTNING...AND TORRENTIAL DOWNPOURS AT RATES OF OVER AN INCH AN HOUR. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. IF YOU LIVE IN NORTHEAST PORTIONS OF JO DAVIESS AND NORTHERN STEPHENSON COUNTIES...MOVE INDOORS AS THESE STORMS APPROACH YOUR AREA. 12
Nearby
Severe Thunderstorm Warnings in Illinois, 2007Every severe thunderstorm warning in 2007
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.