Alert archive / Illinois / Special Weather Statements in 2012
Special Weather Statement, NWS Quad Cities, IA
NWS Quad Cities, IA issued this special weather statement at Jul 1, 2012, 5:42 AM CDT for Hancock County, Illinois. It was in force for 63 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 1, 2012, 5:42 AM CDT (10:42 UTC)
- Expired
- Jul 1, 2012, 6:45 AM CDT
- In force
- 63 min
- Issued by
- NWS Quad Cities, IA
County Hancock County, IL
The radar
The Quad Cities radar (KDVN), 138 km from the middle of the area, began a volume at 10:44 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, 10.7 hours before the alert went out and 141 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
- 2904 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -0.9
The text
As transmitted, in the capitals the NWS used until 2016.
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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 1, 3:10 AM CDT, 2 hours 32 minutes earlier.
Area forecast discussion, Jul 1, 3:10 AM CDT, 2 hours 32 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 310 AM CDT SUN JUL 1 2012 .SYNOPSIS... A QUIET NIGHT ACROSS THE DVN CWA FOR A CHANGE AS THE STALLED FRONTAL BOUNDARY EXTENDS FROM BETWEEN KSTJ/KMCI TO KUIN AND THEN ALONG THE OHIO RIVER VALLEY. A 30 KNOT SOUTHERLY LOW LEVEL JET IS POINTED INTO THE PLAINS. SCATTERED CONVECTION WAS OCCURRING ALONG THE BOUNDARY SOUTH OF THE DVN CWA AND WERE MOVING EAST. WATER VAPOR LOOPS SHOW A SHORT WAVE IN SD MOVING SOUTHEAST WHICH HAS PRODUCED A CLUSTER OF THUNDERSTORMS IN SOUTHCENTRAL SD/NORTHCENTRAL NEBRASKA. CURRENT TEMPERATURES WERE IN THE LOWER TO MID 70S IN THE DVN CWA. HAASE && .SHORT TERM...TODAY AND TONIGHT... FORECAST FOCUS ON TEMPERATURES AND CONVECTIVE TRENDS. TODAY...HEIGHTS BEGIN TO RISE IN RESPONSE TO TROUGH DIGGING INTO THE PACIFIC NORTHWEST/BRITISH COLUMBIA. THIS IN TURN SHOULD LIFT THE FRONTAL BOUNDARY CURRENTLY SOUTH OF THE CWA NORTHWARD AS THE DAY PROGRESSES. WILL MAINTAIN SMALL CHANCE POPS IN OUR FAR SOUTH THIS MORNING CLOSEST TO THE BOUNDARY. IR SATELLITE PICTURES DO INDICATE CIRRUS OVER MUCH OF THE CWA BUT THIS SHOULD THIN AS THE MORNING PROGRESSES. THEN STRONG HEATING WILL PUSH MAXIMUM TEMPERATURES INTO THE LOWER TO MID 90S AT MOST LOCATIONS. HEAT INDEX VALUES SOUTH OF INTERSTATE 80 MAY RISE JUST ABOVE 100 FOR A FEW HOURS THIS AFTERNOON BUT WITH CONVECTION/CLOUDS DECIDED NOT TO ISSUE HEAT HEADLINES AT THIS TIME. DAY SHIFT CAN MONITOR TRENDS AND ISSUE AN ADVISORY IF TEMPS/DEWPOINTS RISE HIGHER THAN FORECAST. SEVERE POTENTIAL...OPERATIONAL MODELS SIMILAR IN DEVELOPING AT LEAST SCATTERED THUNDERSTORMS LATER THIS AFTERNOON AND EVENING AS WAVE OUT OF SD MOVES INTO THE AREA. CAPES RISE TO AROUND 4000 J/KG LATER THIS AFTERNOON BUT DEEP LAYER SHEAR IS MARGINAL. FRONTAL BOUNDARY WILL BE SLOWLY MOVING NORTHWARD ACROSS THE CWA WHICH WILL HELP FOCUS CONVECTION. THE CAP WILL ALSO BE WEAKENING AS FORECAST SOUNDINGS SUGGEST MID LEVEL TEMPS COOLING A BIT. DESPITE MARGINAL SHEAR THE HIGH CAPES WILL BE MORE THAN SUFFICIENT FOR ENHANCED AREAS OF DAMAGING WINDS OF 60 TO 70+ MPH LATE THIS AFTERNOON AND EVENING...ALONG WITH LOCAL HEAVY RAINFALL. WILL HAVE 50 POPS TO COVER THIS SCENARIO. SPC HAS MUCH OF THE DVN CWA IN A SLIGHT RISK. TONIGHT...WITH THE WARM FRONT LIFTING NORTHWARD THE CONVECTION WILL BE GRADUALLY ENDING FROM THE SOUTH. SEVERE POTENTIAL WILL EXIST DURING THE EVENING BUT THE TREND WILL BE FOR STORMS TO WEAKEN AFTER MIDNIGHT WITH LOSS OF HEATING. MIN TEMPS WILL BE IN THE LOWER TO MID 70S. HAASE .LONG TERM...MONDAY THROUGH SATURDAY... MONDAY THE WARM FRONT THAT WILL HAVE BEEN PASSING SLOWLY NORTH ACROSS THE AREA TODAY AND TONIGHT SHOULD FINALLY GET NORTH OF THE FORECAST AREA. THERE MAY BE SOME SHOWERS OR THUNDERSTORMS THAT GET INTO THE NORTHEASTERN COUNTIES AS CONVECTION DEVELOPS ALONG THAT BOUNDARY DURING THE AFTERNOON AS A WEAK SHORTWAVE MOVES THROUGH THE UPPER LEVEL FLOW. THUS...HAVE CARRIED SOME LOW CHANCE POPS IN THE NORTHEAST FOR MONDAY...BUT NOT MONDAY NIGHT AS THESE FEATURES MOVE FAR ENOUGH AWAY TO NOT AFFECT THE CWA ANY LONGER. WITH THE FRONT NORTH OF THE AREA WE SHOULD BE BACK IN THE HOTTER AND MORE HUMID AIR AGAIN...AND WE MAY NEED A HEAT ADVISORY FOR MONDAY WITH HIGH TEMPS BACK IN THE MID TO UPPER 90S AGAIN. WE REMAIN IN THE WARM SECTOR WITH BROAD RIDGING ALOFT AND SOUTHWEST SURFACE FLOW AT THE SURFACE FOR TUESDAY THROUGH THE REMAINDER OF THE WORK WEEK. THIS WILL LEAVE US WITH HOT AND HUMID CONDITIONS WITH HIGH TEMPS IN THE 90S AND OVERNIGHT MIN TEMPS ONLY IN THE 70S. WEDNESDAY AND WEDNESDAY EVENING THERE ARE SOME INDICATIONS THAT A SHORTWAVE WILL MOVE ACROSS THE MIDWEST WHICH MAY BE ABLE TO PRODUCE SOME SHOWERS AND THUNDERSTORMS FOR THE NORTHERN HALF OF THE AREA...ALONG WITH A DIP OF THE WARM FRONT BACK IN OUR DIRECTION AGAIN. HOWEVER...IT IS SOMEWHAT QUESTIONABLE WHETHER IT WILL MAKE IT THIS FAR SOUTH AND AM ONLY CARRYING SOME SLIGHT CHANCE POPS. FRIDAY NIGHT AND SATURDAY THERE ARE SOME DIFFERENCES SHOWING UP IN THE MODELS...WITH A COLD FRONT THAT SAGS TOWARDS THE AREA. THE GFS IS MUCH FASTER THAN THE ECMWF...BRINGING IT IN FRIDAY NIGHT VS SUNDAY RESPECTIVELY. CANNOT RULE OUT EITHER SCENARIO...SO HAVE BROUGHT IN SOME SLIGHT CHANCE POPS FOR FRIDAY NIGHT AND SATURDAY WHICH WE CAN EITHER RAISE OR LOWER AS THESE ISSUES GET RESOLVED. HAVE KEPT THE VERY WARM TEMPERATURES GOING WHICH WOULD NEED TO BE LOWERED IF THE GFS SOLUTION IS REALIZED. LE && .AVIATION... LOCAL MVFR VIS IN BR TIL 14Z THIS MORNING. THEN VFR CONDS THROUGH TONIGHT EXCEPT MVFR CIGS IN TSRA AS A WARM FRONT GRADUALLY LIFTS NORTHWARD ACROSS THE AREA TODAY. A FEW SHOWERS/ISOLD -TSRA ARE POSSIBLE AT/NEAR KBRL THIS MORNING. AT LEAST SCATTERED THUNDERSTORMS... SOME POSSIBLY SEVERE...SHOULD DEVELOP LATE THIS AFTERNOON AND EVENING. VARIABLE OR EAST TO SOUTHEAST WINDS LESS THAN 5 KNOTS THIS MORNING BECOMING SOUTH AS A WARM FRONT LIFTS NORTHWARD. SOUTH TO SOUTHWEST WINDS LESS THAN 10 KNOTS TONIGHT. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && HAASE/LE
Hazardous weather outlook, Jul 1, 4:20 AM CDT, 1 hour 22 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 420 AM CDT SUN JUL 1 2012 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-020930- 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- 420 AM CDT SUN JUL 1 2012 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 SCATTERED THUNDERSTORMS THIS MORNING SOUTH OF HIGHWAY 34 MAY PRODUCE SMALL HAIL AND BRIEF HEAVY RAINFALL. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS OVER MUCH OF THE OUTLOOK AREA FOR THIS AFTERNOON AND INTO TONIGHT. A WARM FRONT WILL BE LIFTING NORTHWARD AND WILL BE THE FOCUS FOR STRONG TO SEVERE THUNDERSTORMS. DAMAGING WINDS OF AT LEAST 60 TO 70 MPH...FREQUENT DANGEROUS LIGHTNING AND VERY HEAVY RAINFALL ARE THE MAIN THREATS. AFTERNOON TEMPERATURES WILL SOAR INTO THE LOWER TO MID 90S ESPECIALLY SOUTH OF INTERSTATE 80. HEAT INDEX VALUES MAY BRIEFLY RISE TO JUST ABOVE 100 THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE MONDAY FOR THE NORTHERN PORTIONS OF THE OUTLOOK AREA AS A WEAK WARM FRONT SHIFTS NORTH OF THE AREA. AT THIS TIME...SEVERE THUNDERSTORMS ARE NOT ANTICIPATED. THUNDERSTORMS RETURN TO THE FORECAST ON WEDNESDAY AND AGAIN ON FRIDAY NIGHT AND SATURDAY. AT THIS TIME IT IS TOO SOON TO DETERMINE THE POTENTIAL FOR SEVERE THUNDERSTORMS. HEAT INDEX VALUES MAY EXCEED 100 DURING THE AFTERNOON AND EARLY EVENING FOR MUCH OF THE UPCOMING WEEK. KEEP UPDATED ON THIS HOT AND HUMID WEATHER AS HEAT ADVISORIES...AND POSSIBLY EXCESSIVE HEAT WARNINGS MAY BE NECESSARY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. HAASE/LE
In the hours before
Special weather statement, Jul 1, 3:40 AM CDT, 2 hours 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 340 AM CDT SUN JUL 1 2012 ILZ034-035-010945- HANCOCK-MCDONOUGH- 340 AM CDT SUN JUL 1 2012 ...THUNDERSTORMS IN WESTERN ILLINOIS... AT 339 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THUNDERSTORMS WERE RAPIDLY DEVELOPING 6 MILES SOUTHEAST OF CARTHAGE...MOVING NORTHEAST AT 20 MPH. * THE THUNDERSTORM WILL BE NEAR... COLMAR AROUND 405 AM CDT... TENNESSEE AROUND 415 AM CDT... FANDON AND COLCHESTER AROUND 425 AM CDT... WESTERN ILLINOIS UNIVERSITY...MACOMB AND 6 MILES SOUTH OF GOOD HOPE AROUND 445 AM CDT... PEA SIZE HAIL...BRIEF HEAVY RAIN...ARE EXPECTED WITH THESE STORMS. LAT...LON 4022 9113 4039 9122 4059 9061 4040 9053 TIME...MOT...LOC 0840Z 247DEG 17KT 4034 9105 HAASE
Special weather statement, Jul 1, 3:48 AM CDT, 1 hour 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
348 AM CDT SUN JUL 1 2012
IAZ099-ILZ034-035-MOZ009-010-010945-
LEE IA-MCDONOUGH IL-HANCOCK IL-CLARK MO-SCOTLAND MO-
348 AM CDT SUN JUL 1 2012
...RAPIDLY DEVELOPING THUNDERSTORMS...
AT 345 AM CDT DOPPLER RADAR INDICATED RAPIDLY DEVELOPING
THUNDERSTORMS IN EXTREME NORTHEAST MISSOURI AND WESTERN ILLINOIS.
THE MAIN AREA OF SCATTERED STORMS WAS FROM SOUTHERN CLARK COUNTY
MISSOURI INTO SOUTHERN HANCOCK COUNTY ILLINOIS. THE STORMS WERE
GENERALLY MOVING EAST AT 20 MPH.
THE STRONGER STORMS MAY PRODUCE PEA SIZE HAIL AND BRIEF HEAVY
RAINFALL ALONG WITH OCCASIONAL CLOUD TO GROUND LIGHTNING.
&&
LAT...LON 4024 9151 4025 9195 4030 9195 4030 9201
4036 9202 4050 9079 4031 9072 4028 9090
4026 9091 4020 9150
HAASESpecial weather statement, Jul 1, 5:42 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 542 AM CDT SUN JUL 1 2012 IAZ099-ILZ034-MOZ010-011145- CLARK-HANCOCK-LEE- 542 AM CDT SUN JUL 1 2012 ...STRONG THUNDERSTORM NEAR KEOKUK IOWA... AT 536 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR ALEXANDRIA...OR NEAR KEOKUK...MOVING EAST AT 20 MPH. * THE THUNDERSTORM WILL BE NEAR... ALEXANDRIA AND 8 MILES SOUTH OF MONTROSE AROUND 545 AM CDT... KEOKUK AND WARSAW AROUND 550 AM CDT... HAMILTON AROUND 600 AM CDT... 7 MILES SOUTH OF FERRIS AROUND 630 AM CDT... CARTHAGE AROUND 640 AM CDT... WINDS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. LAT...LON 4058 9098 4034 9100 4034 9161 4052 9157 TIME...MOT...LOC 1039Z 280DEG 15KT 4041 9147 HAASE
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 6:55 AM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 35 min |
| Jul 1, 8:09 AM CDT | Special Weather Statement | DVN | Des Moines, Henry, Jefferson, Van Buren | 51 min |
| Jul 1, 8:30 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 27 min |
| Jul 1, 3:40 AM CDT | Special Weather Statement | DVN | Hancock, McDonough | 65 min |
| Jul 1, 3:48 AM CDT | Special Weather Statement | DVN | Hancock | 57 min |
| Jul 1, 6:35 AM CDT | Special Weather Statement | DVN | Hancock | 55 min |
| Jul 1, 6:36 AM CDT | Special Weather Statement | DVN | Hancock | 54 min |
Nearby
Special Weather Statements in Illinois, 2012Every special weather statement in 2012
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.