Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 87, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 8, 1987, 8:05 PM CDT for Linn County, Iowa. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1987, 8:05 PM CDT (01:05 UTC)
- Expired
- Jul 8, 1987, 8:35 PM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Linn County, IA
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 00:00Z, 1.1 hours before the alert went out and 229 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
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 090107 SVRDSM IAC113-090105- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 805 PM CDT WED JUL 8 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 835 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF EAST CENTRAL IOWA... LINN AT 805 PM CDT A SEVERE THUNDERSTORM WAS MOVING THROUGH LINN COUNTY IN EAST CENTRAL IOWA. THE STORM CONTINUED TO PRODUCE SEVERE WEATHER AS IT MOVED EAST. THE STORM SHOULD BE THROUGH LINN COUNTY BY 835 PM. THE STORM HAS PRODUCED STRONG WINDS THAT HAS UPROOTED TREES AND DOWNED POWER LINES. ALSO NUMEROUS REPORTS OF FUNNEL CLOUDS HAVE BEEN RECEIVED. THE FOLLOWING TOWNS AND CITIES OF LINN COUNTY ARE INCLUDED IN THE WARNING...CEDAR RAPIDS...CENTRAL CITY...20 MILES NORTH OF CEDAR RAPIDS AND MOUNT VERNON...15 MILES SOUTHEAST OF CEDAR RAPIDS. THE STORM WAS MOVING EAST AT 30 TO 35 MILES AN HOUR. 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. FORSTER
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, 2:57 PM CDT, 5 hours 8 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, 4 hours 57 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, 4 hours 48 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
Local storm report, Jul 8, 7:54 PM CDT, 11 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WATERLOO IA
800 PM CDT WED JUL 8 1987
TIME EVENT
630 PM CDT...IN WEST WATERLOO/CEDAR FALLS AREA...EXTENSIVE TREE TOP
DAMAGE...TREE LIMBS UP TO 8 INCHES IN DIAMETER...PLUS
A HEALTHY 2 FOOT MAPLE TREE BLOWN OVER. A STORAGE SHED
BLOWN ABOUT 150 YARDS DOWN THE STREET. SOME ROOF AND
PORCH DAMAGE. ESTIMATED 65 TO 90 MPH WINDS. ALL DAMAGE
w ALONG ONE STREET FOR ABOUT .2 OF A MILE.
HAYSThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:06 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 39 min |
| Jul 8, 7:27 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 38 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; the sounding from the Mesonet's radiosonde archive.