Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 82, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 7, 1987, 2:06 AM CDT for Buena Vista County, Clay County, Iowa. It was in force for 84 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 7, 1987, 2:06 AM CDT (07:06 UTC)
- Expired
- Jul 7, 1987, 3:30 AM CDT
- In force
- 84 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Buena Vista County, IA, Clay 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 7, 2:10 AM CDT | Thunderstorm Wind 52 | Buena Vista, 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
Omaha, NE (KOAX), launched 00:00Z, 7.1 hours before the alert went out and 203 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
- 3581 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 070706 SVRDSM IAC021-041-070800- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 206 AM CDT TUE JUL 7 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 330 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHWEST IOWA... BUENA VISTA AND CLAY AT 200 AM CDT THIS MORNING...RADAR INDICATED SEVERE THUNDERSTORMS OVER EASTERN OBRIEN AND CHEROKEE COUNTIES IN NORTHWEST IOWA. THE STRONGEST ACTIVITY WAS LOCATED OVER THE SOUTHWEST CORNER OF CHEROKEE COUNTY...ABOUT 40 MILES NORTHEAST OF SIOUX CITY. THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR. THE HEAVIER STORMS WILL ARRIVE AT STORM LAKE...THE COUNTY SEAT OF BUENA VISTA COUNTY ABOUT 60 MILES EAST OF SIOUX CITY...AROUND 230 AM CDT THIS MORNING. THE FIRE DEPARTMENT AT ROYAL...A COMMUNITY IN WESTERN CLAY COUNTY... ABOUT 10 MILES SOUTHWEST OF SPENCER...OR ABOUT 75 MILES NORTHEAST OF SIOUX CITY REPORTED WIND GUSTS AROUND 60 MILES AN HOUR JUST WEST OF ROYAL AT 203 AM CDT. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. PEOPLE IN THE PATH OF THIS STORM SHOULD TAKE APPROPRIATE ACTION IMMEDIATELY. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED. IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY. IF SEVERE WEATHER CONDITIONS ARE OBSERVED..PLEASE ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE. BIKLE
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, 8:40 PM CDT, 5 hours 26 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 838 PM CDT MON JUL 6 1987 AT 831 PM CDT... VERY STRONG THUNDERSTORMS CONTINUED OVER PARTS OF CENTRAL INTO EAST CENTRAL IOWA. THE STRONGEST STORMS WERE LOCATED ABOUT 30 MILES SOUTH OF CEDAR RAPIDS. ANOTHER STRONG STORM WAS 30 MILES SOUTHEAST OF DES MOINES...NEAR KNOXVILLE. THESE STORMS WILL PRODUCE BRIEF GUSTY WINDS POSSIBLY SOME SMALL HAIL...AND VERY HEAVY RAIN. OTHER THUNDERSHOWERS WERE LOCATED JUST NORTH OF OTTUMWA...AND NEAR DAVENPORT. THE RAIN WAS DRIFTING EAST AT 10 TO 15 MILES AN HOUR. SCHUMACHER BARLOW
Local storm report, Jul 6, 9:53 PM CDT, 4 hours 13 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES
955 PM CDT MON JUL 6 1987
...ALL EVENTS OCCURRED PM CDT ON JULY 6TH...
320 PEA SIZE HAIL AT BRANDON IOWA IN BUCHANAN COUNTY
328 MARBLE SIZE HAIL 2 MILES SOUTH AND EAST OF BRANDON
342 DIME SIZE HAIL 3 MILE NORTH OF URBANA IN BENTON COUNTY
349 THREE QUARTER INCH HAIL ON NORTH EDGE OF URBANA
359 DIME SIZE HAIL AT CENTER POINT IN LINN COUNTY
420 DIME SIZE HAIL AT ALBURNETTE IN LINN COUNTY
425 FUNNEL CLOUD NEAR PALO IN LINN COUNTY
428 FUNNEL CLOUD SIGHTED FROM BROADCAST PARK NORTHEAST OF
CEDAR RAPIDS AREA IN LINN COUNTY
449 FUNNEL CLOUDS SIGHTED JUST WEST OF CEDAR RAPIDS
503 1 INCH HAIL OBSERVED 1 MILE WEST OF HIAWATHA; ON WEST
SIDE OF CEDAR RAPIDS BY U.S. 30; AND ON THE NORTH SIDE
BY THE HIGH SCHOOL.
517 QUARTER SIZE HAIL AT PALISADES-KEPLER PARK IN LINN COUNTY
540 GOLFBALL SIZE HAIL REPORTED AT SOLON IN JOHNSON COUNTY
DOWDSpecial weather statement, Jul 6, 11:46 PM CDT, 2 hours 20 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1145 PM CDT MON JUL 6 1987 ...SEVERE THUNDERSTORM WATCH FOR NORTHWEST IOWA UNTIL 400 AM CDT... ...NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 1100 AND 1145 PM... AT 1134 PM CDT... NO THUNDERSTORMS WERE OCCURRING IN IOWA...HOWEVER A LINE OF INTENSE STORMS WAS POISED TO ENTER THE STATE. THEY EXTENDED ACROSS SOUTHWEST MINNESOTA...INTO SOUTHEAST SOUTH DAKOT*A...INTO NORTHEAST NEBRASKA. THESE STORMS SHOULD ENTER THE STATE BY 1230 AM TUESDAY MORNING. THEY WERE MOVING EAST-SOUTHEAST AT 30 MILES AN HOUR. SCHUMACHER
Special weather statement, Jul 7, 12:44 AM CDT, 1 hour 22 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1245 AM CDT TUE JUL 7 1987 ...SEVERE THUNDERSTORM WATCH FOR NORTHWEST IOWA UNTIL 400 AM CDT... ...NO SEVERE WEATHER WAS REPORTED IN IOWA BETWEEN 1145 AND 1245 AM... AT 1235 AM CDT... A LINE OF INTENSE THUNDERSTORMS WAS ENTERING NORTHWEST IOWA NORTH OF SIOUX CITY. THEY EXTENDED ACROSS SOUTHWEST MINNESOTA...INTO SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWMA AND NORTHEAST NEBRASKA. THEY WERE MOVING EAST-SOUTHEAST AT 30 MILES AN HOUR. SCOTT
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 7:27 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 33 min |
| Jul 7, 8:16 AM CDT | Flash Flood Warning | DMX | Clarke, Decatur | 3 hr |
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.