Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 12, NWS Quad Cities, IA

July 6, 1987Jo Daviess County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 6, 1987, 2:00 PM CDT for Jo Daviess County, Illinois. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1987, 2:00 PM CDT (19:00 UTC)
Expired: Jul 6, 1987, 3:00 PM CDT
In force: 60 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Jo Daviess County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 12:00Z, 7.0 hours before the alert went out and 195 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: NaN m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, Jul 6, 10:53 AM CDT, 3 hours 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
1053 AM CDT MON JUL 6 1987

...THUNDERSTORMS IN WESTERN PORTIONS OF THE TRI-STATE AREA...

THUNDERSTORMS WERE IN THE WESTERN PORTION OF THE TRI-STATE AREA AT
1050 THIS MORNING.  THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST
AT 20 TO 25 MILES AN HOUR.

THE STRONGEST STORM WAS LOCATED NEAR MANCHESTER...40 MILES WEST OF
DUBUQUE.

THE LEADING EDGE OF THE RAIN WAS FROM NEAR ELKADER...40 MILES NORTH-
WEST OF DUBUQUE...TO NEAR ANAMOSA...40 MILES SOUTHWEST OF DUBUQUE.

THESE STORMS WILL PRODUCE HEAVY RAIN AND GUSTY WIND AS THEY MOVE
ACROSS THE AREA LATE THIS MORNING. THESE THUNDERSTORMS COULD ALSO
PRODUCE SMALL HAIL.

ASMUS

Special weather statement, Jul 6, 12:34 PM CDT, 1 hour 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DUBUQUE IA
1235 PM CDT MON JUL 6 1987

    ...THUNDERSTORMS CONTINUING IN THE TRI-STATE AREA...

AT 1230 PM CDT SCATTERED THUNDERSTORMS WERE PRODUCING HEAVY RAIN
...GUSTY WINDS...AND DANGEROUS LIGHTNING IN PORTIONS OF THE
DUBUQUE TRI-STATE AREA.

THE STRONGEST THUNDERSTORMS WERE LOCATED NEAR ANAMOSA...40 MILES
SOUTHWEST OF DUBUQUE...NEAR MAQUOKETA...30 MILES SOUTH OF DUBUQUE...
AND NEAR LANCASTER WISCONSIN...25 MILES NORTHEAST OF DUBUQUE.

THE THUNDERSTORMS WERE PART OF AN AREA OF PRECIPITATION THAT COVERED
MUCH OF THE TRI-STATE AREA IN A 30 MILES WIDE BAND EXTENDING FROM
SOUTHWEST WISCONSIN...ACROSS DYERSVILLE TO NEAR CEDAR RAPIDS.

ALL THE PRECIPITATON WAS MOVING TO THE NORTHEAST AT 20 TO 25 MILES
AN HOUR.

THE STRONG THUNDERSTORMS WILL CONTINUE PRODUCING HEAVY RAIN...GUSTY
WINDS...AND DANGEROUS LIGHTNING FOR THE NEXT 2 TO 3 HOURS.  THESE
STORMS ARE ALSO 2CAPABLE OF PRODUCING SMALL HAIL.

IF THREATENING WEATHER SHOULD APPROACH...TAKE COVER UNTIL THE STORM
PASSES.

ASMUS

Local storm report, Jul 6, 1:31 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DUBUQUE IA
610 PM CDT THU JUN 18 1987

111 PM...MARBLE SIZE HAIL AND STRONG WIND AT CITY OF OLIN IN
         SOUTHERN JONES COUNTY.

116 PM...3/4 tINCH AND LARGER REPORTED IN THE CITY OF WYOMING IN
         SOUTHER JONES COUNTY.

REPORTS WERE FROM THE CIVIL DEFENSE DIRECTOR IN JONES COUNTY.

KOWALSKI

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 6, 12:35 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque, Jones	55 min
Jul 6, 12:55 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	65 min
Jul 6, 4:35 PM CDT	Severe Thunderstorm Warning	DVN	Jones	55 min
Jul 6, 6:06 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	39 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1987 Every severe thunderstorm warning in 1987

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.