Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 49, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 11, 1987, 6:02 PM CDT for Franklin County, Iowa. It was in force for 15 min.
The area
The counties it named.
The facts
- Issued
- Jun 11, 1987, 6:02 PM CDT (23:02 UTC)
- Expired
- Jun 11, 1987, 6:17 PM CDT
- In force
- 15 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Franklin 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
Minneapolis, MN (KSTC), launched 12:00Z, 11.0 hours before the alert went out and 237 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
- 22 J/kg
- Mixed-layer CIN
- -202 J/kg
- Mixed-layer LCL
- 1137 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 140 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 KALO 112302
SVRALO
IAC069-120000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
602 PM CDT THU JUN 11 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN NORTH CENTRAL IOWA
...SOUTHERN FRANKLIN
AT 600PM CDT NATIONAL WEATHER SERVICE RADAR AT WATERLOO SHOWED A
SEVERE THUNDERSTORM NEAR POPEJOY 35 MILES EAST OF FORT DODGE.
THIS STORM WAS MOVING EAST AT 30 MPH.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.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, Jun 11, 4:43 PM CDT, 1 hour 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 440 PM CDT THU JUN 11 1987 ...A LINE OF VERY STRONG THUNDERSTORMS CONTINUE IN NORTHEAST IOWA... AT 435 PM CDT WATERLOO RADAR SHOWED A LINE OF VERY STRONG THUNDERSTORMS STRETCHING FROM NEAR OSAGE...ABOUT 15 MILES NORTHEAST OF MASON CITY TO ABOUT 15 MILES NORTHEAST OF FORT DODGE. THE STRONGEST STORMS WERE LOCATED NEAR OSAGE AND NEAR CLARION...20 MILES NORTHEAST OF FORT DODGE.& THESE THUNDERSTORMS WERE MOVING EAST AT 15 MILES AN HOUR. IF YOU ARE IN THE PATH OF THESE STORMS YOU CAN EXPECTED BRIEF HEAVY RAIN AND SMALL HAIL AS THEY PASS BY. HAYS
Special weather statement, Jun 11, 4:46 PM CDT, 1 hour 16 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 446 PM CDT THU APR 11 1987 AT 435 PM...A BAND OF INTENSE THUNDERSTORMS HAD DEVELOPED OVER NORTH CENTRAL IOWA. THE STORMS WERE LOCATED IN A 20 MILE WIDE AREA THAT STRETCHED FROM 70 MILES NORTH OF DES MOINES NEAR CLARION NORTHEAST TO OSAGE...25 MILES NORTHEAST OF MASON CITY. DUE TO THE RAPID DEVELOPMENT OF THESE STORMS...VERY HEAVY RAIN ...GUSTY WINDS AND SMALL HAIL IS LIKELY. THE STRONGEST STORMS IN THIS BAND WERE LOCATED JUST NORTHWEST AND NORTHEAST OF CLARION. ELSEWHERE A SMALL CLUSTER OF STORMS WAS LOCATED 30 MILES NORTHWEST OF MASON CITY ALONG THE IOWA/MINNESOTA BORDER...WHILE ISOLATED LIGHT+ SHOWERS AND THUNDERSHOWERS WERE LOCATED OVER THE SOUTHEAST THIRD OF IOWAS COUNTIES. THE OVERALL MOVEMENT OF THE SHOWERS AND STORMS WAS EAST AT 25 MILES AN HOUR. BARLOW
Special weather statement, Jun 11, 5:47 PM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 545 PM CDT THU APR 11 1987 AT 535 PM...A 20 MILE WIDE BAND OF INTENSE THUNDERSTORMS WAS LOCATED FROM NORTH CENTRAL INTO NORTHEAST IOWA. THE BAND STRETCHED FROM 30 MILES SOUTH OF MASON CITY...NEAR CLARION NORTHEAST TO 20 MILES NORTHWEST OF DECORAH. PEA TO MARBLE SIZED HAIL...VERY HEAVY RAIN AND GUSTY WINDS CAN BE EXPECTED WITH THESE STORMS. A SMALL CLUSTER OF SHOWERS AND THUNDERSHOWERS WAS LOCATED 10 MILES NORTHWEST OF MASON CITY...WHILE ISOLATED SHOWERS WERE LOCATED OVER THE EXTREME EAST CENTRAL AND SOUTHEAST COUNTIES OF THE STATE. THE SHOWERS AND STORMS WERE MOVING EAST AT 20 MILES AN HOUR. s BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 4:57 PM CDT | Severe Thunderstorm Warning | DMX | Wright | 33 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.