Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 10, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 6, 1987, 12:35 PM CDT for Dubuque County, Jones County, Iowa. It was in force for 55 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 6, 1987, 12:35 PM CDT (17:35 UTC)
- Expired
- Jul 6, 1987, 1:30 PM CDT
- In force
- 55 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties Dubuque County, IA, Jones County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 6, 1:16 PM CDT | Hail 0.75 | Jones, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Peoria Regional, IL (KPIA), launched 12:00Z, 5.6 hours before the alert went out and 215 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
- 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
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, 1 hour 42 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 minute 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.
ASMUSThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 |
| Jul 6, 2:00 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess | 60 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1987Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.