Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 85, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 8, 1987, 7:06 PM CDT for Benton County, Iowa. It was in force for 39 min. 3 reports 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 8, 1987, 7:06 PM CDT (00:06 UTC)
- Expired
- Jul 8, 1987, 7:45 PM CDT
- In force
- 39 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Benton 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 8, 7:20 PM CDT | Thunderstorm Wind 61 | Benton, IA | |
| Jul 8, 7:35 PM CDT | Hail 1 | Benton, IA | |
| Jul 8, 7:55 PM CDT | Thunderstorm Wind 57 | Benton, 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 00:00Z, 0.1 hours before the alert went out and 259 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
- 2463 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1093 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 112 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 8, 1:49 PM CDT, 5 hours 17 minutes before
SPECIAL WEATHER STATEMENT RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 148 PM CDT TUE JUL 7 1987 AT 135 PM...SHOWERS AND ISOLATED STRONG THUNDERSTORMS WERE BECOMING MORE NUMEROUS OVER THE SOUTHWEST HALF OF IOWA. MOST OF THE SHOWERS AND STORMS WERE OCCURRING SOUTHWEST OF A LINE FROM SPENCER IN NORTHWEST IOWA SOUTHEAST TO CENTERVILLE...60 MILES SOUTHEAST OF DES MOINES. THE STRONGEST STORMS WERE LOCATED JUST SOUTHWEST OF DES MOINES... 60 MILES SOUTH OF DES MOINES NEAR LAMONI AND 70 MILES WEST SOUTHWEST OF DES MOINES NEAR CUMBERLAND. THESE STORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAIN...GUSTY WINDS AND DANGEROUS LIGHTNING. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 25 TO 30 MILES AN HOUR. BARLOW
Special weather statement, Jul 8, 2:57 PM CDT, 4 hours 9 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 257 PM CDT WED JUL 8 1987 THE SEVERE THUNDERSTORM WARNING FOR WESTERN GUTHRIE COUNTY WILL EXPIRE AT 300 PM CDT. THE THUNDERSTORM ACTIVITY IN THIS COUNTY HAS WEAKENED CONSIDERABLY DURING THE LAST 10 MINUTES. THEREFORE... THE WARNING WILL NOT BE RENEWED. THE THUNDERSTORMS HAD MOVED INTO THE EASTERN HALF OF THE COUNTY. PEOPLE LIVING IN EASTERN GUTHRIE COUNTY SHOULD EXPECT< SOME HEAVY RAINS AND MODERATE WINDS AS THESE STORMS PASS THROUGH. THE STORMS WERE MOVING NORTH NORTHEAST AROUND 25 MILES AN HOUR. BIKLE
Special weather statement, Jul 8, 3:08 PM CDT, 3 hours 58 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 307 PM CDT WED JUL 8 1987 A VERY STRONG THUNDERSTORM WAS OVER SOUTHWEST APPANOOSE COUNTY AT 303 PM CDT. THE STORM WAS MOVING NORTH NORTHEAST AT 25 MILES AN HOUR AND WILL BE ARRIVING AT RATHBUN RESERVOIR ABOUT 310 PM CDT. RATHBUN RESERVOIR IS ABOUT 60 MILES SOUTHEAST OF DES MOINES. BOATERS AND PEOPLE HAVING ACTIVITIES AT RATHBUN RESERVOIR SHOULD SEEK SAFE HARBOR ANDE SHELTER AS QUICKLY AS POSSIBLE. THIS STORM IS CAPABLE OF PRODUCING BRIEF HEAVY RAINS AND GUSTY WINDS. BIKLE
Special weather statement, Jul 8, 3:17 PM CDT, 3 hours 49 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 315 PM CDT WED JUL 7 1987 AT 312 PM CDT...RADAR INDICATED A VERY STRONG THUNDERSTORM OVER SOUTHERN MARION COUNTY...IN THE VICINITY OF KNOXVILLE...THE COUNTY SEAT...ABOUT 30 MILES SOUTHEAST OF DES MOINES. THE STORM WAS MOVING NORTH NORTHEAST AT 25 MILES AN HOUR AND WILL BE AFFECTING RED ROCK RESERVOIR AT 318 PM CDT. BOATERS AND PEOPLE HAVING ACTIVITIES AT RED ROCK RESERVKOIR SHOULD SEEK SAFE HARBOR AND SHELTER AS QUICKLY AS POSSIBLE. THIS STORM IS CAPABLE OF PRODUCING BRIEF HEAVY RAINS...GUSTY WINDS... AND POSSIBLE PEA TO MARBLE SIZE HAIL. BIKLE
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:27 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 38 min |
| Jul 8, 8:05 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 30 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.