Alert archive / Illinois / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 21, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at May 8, 2009, 7:40 PM CDT for Louisa County, Muscatine County, Iowa; Henry County, Mercer County, Rock Island County, Illinois. It was in force for 49 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 8, 2009, 7:40 PM CDT (00:40 UTC)
- Expired
- May 8, 2009, 8:29 PM CDT
- In force
- 49 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
Counties Louisa County, IA, Muscatine County, IA, Henry County, IL, Mercer County, IL, Rock Island County, IL
The radar
The Quad Cities radar (KDVN), 34 km from the middle of the area, began a volume at 00:43 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 8, 7:48 PM CDT | TSTM WND GST 70 | 4 W Illinois City, IL | SPOTTER ESTIMATED AT 65 TO 70 MPH WITH PEA SIZE HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 8, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 38 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
- 354 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1505 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KDVN 090040 SVRDVN IAC115-139-ILC073-131-161-090145- /O.NEW.KDVN.SV.W.0021.090509T0040Z-090509T0145Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 740 PM CDT FRI MAY 8 2009 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MUSCATINE COUNTY IN EAST CENTRAL IOWA... WEST CENTRAL HENRY COUNTY IN NORTHWEST ILLINOIS... MERCER COUNTY IN NORTHWEST ILLINOIS... SOUTHWESTERN ROCK ISLAND COUNTY IN NORTHWEST ILLINOIS... CENTRAL LOUISA COUNTY IN SOUTHEAST IOWA... * UNTIL 845 PM CDT. * AT 740 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED APPROXIMATELY NEAR FRUITLAND... OR 7 MILES SOUTHWEST OF MUSCATINE...AND MOVING EAST AT 45 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... ELIZA AROUND 750 PM CDT... ELIZA AROUND 755 PM CDT... MILLERSBURG AROUND 805 PM CDT... HAMLET AND REYNOLDS AROUND 810 PM CDT... MATHERVILLE...SHALE CITY AND WANLOCK AROUND 815 PM CDT... BODEN AROUND 820 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. MOVE IMMEDIATELY INDOORS AND STAY AWAY FROM WINDOWS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT SATURDAY MORNING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS. && LAT...LON 4144 9034 4107 9048 4121 9130 4145 9118 TIME...MOT...LOC 0040Z 274DEG 40KT 4133 9115 $$ ERVIN
3 follow-up statements
000 WWUS53 KDVN 090049 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 749 PM CDT FRI MAY 8 2009 IAC115-139-ILC073-131-161-090145- /O.CON.KDVN.SV.W.0021.000000T0000Z-090509T0145Z/ MUSCATINE IA-LOUISA IA-ROCK ISLAND IL-MERCER IL-HENRY IL- 749 PM CDT FRI MAY 8 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR WEST CENTRAL HENRY...MERCER...SOUTHWESTERN ROCK ISLAND...CENTRAL LOUISA AND SOUTH CENTRAL MUSCATINE COUNTIES... AT 749 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED APPROXIMATELY NEAR ELIZA...OR 8 MILES SOUTHEAST OF MUSCATINE...MOVING EAST AT 50 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... BUFFALO PRAIRIE AND ILLINOIS CITY AROUND 750 PM CDT... MARSTON...EDGINGTON AND MILLERSBURG AROUND 800 PM CDT... HAMLET...GINGLE CORNERS AND ALEDO MERCER COUNTY AIRPORT AROUND 805 PM CDT... REYNOLDS AND TAYLOR RIDGE AROUND 810 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT SATURDAY MORNING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS. && LAT...LON 4144 9110 4144 9034 4107 9048 4121 9130 TIME...MOT...LOC 0049Z 273DEG 42KT 4132 9098 $$ ERVIN
000 WWUS53 KDVN 090115 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 815 PM CDT FRI MAY 8 2009 IAC115-139-090125- /O.CAN.KDVN.SV.W.0021.000000T0000Z-090509T0145Z/ MUSCATINE IA-LOUISA IA- 815 PM CDT FRI MAY 8 2009 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LOUISA AND SOUTH CENTRAL MUSCATINE COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM THAT PRODUCED DAMAGING WINDS AROUND MUSCATINE HAS MOVED OUT OF THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT SATURDAY MORNING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS. LAT...LON 4142 9067 4144 9034 4107 9048 4115 9093 TIME...MOT...LOC 0115Z 273DEG 42KT 4130 9058 $$ ILC073-131-161-090145- /O.CON.KDVN.SV.W.0021.000000T0000Z-090509T0145Z/ ROCK ISLAND IL-MERCER IL-HENRY IL- 815 PM CDT FRI MAY 8 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR WEST CENTRAL HENRY...MERCER AND SOUTH CENTRAL ROCK ISLAND COUNTIES... AT 815 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED APPROXIMATELY NEAR PREEMPTION...OR 11 MILES NORTHEAST OF ALEDO...MOVING EAST AT 40 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... CABLE...SHERRARD AND GRIFFIN AROUND 820 PM CDT... SWEDONA...NEW WINDSOR...SUNNY HILL AND 9 MILES SOUTH OF WARNER AROUND 825 PM CDT... ORION AROUND 830 PM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT SATURDAY MORNING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS. && LAT...LON 4142 9067 4144 9034 4107 9048 4115 9093 TIME...MOT...LOC 0115Z 273DEG 42KT 4130 9058 $$ ERVIN
000 WWUS53 KDVN 090129 SVSDVN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 829 PM CDT FRI MAY 8 2009 ILC073-131-161-090138- /O.CAN.KDVN.SV.W.0021.000000T0000Z-090509T0145Z/ ROCK ISLAND IL-MERCER IL-HENRY IL- 829 PM CDT FRI MAY 8 2009 ...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL HENRY...MERCER AND SOUTH CENTRAL ROCK ISLAND COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM THAT PRODUCED DAMAGING WINDS HAS WEAKENED. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. HOWEVER...THIS STORM IS STILL CAPABLE OF PRODUCING HEAVY RAIN. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT SATURDAY MORNING FOR EASTERN IOWA AND NORTHWESTERN ILLINOIS. LAT...LON 4142 9067 4144 9034 4107 9048 4115 9093 TIME...MOT...LOC 0128Z 273DEG 42KT 4129 9038 $$ ERVIN
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 7:07 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Louisa, Washington | 41 min |
| May 8, 7:57 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa | 63 min |
| May 8, 8:07 PM CDT | Tornado Warning | DVN | Louisa | 38 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2009Severe Thunderstorm Warnings in Iowa, 2009Every severe thunderstorm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.