Alert archive / Iowa / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 76, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 6, 1987, 3:25 PM CDT for Buchanan County, Iowa. It was in force for 50 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, 3:25 PM CDT (20:25 UTC)
- Expired
- Jul 6, 1987, 4:15 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Buchanan 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, 3:39 PM CDT | Hail 0.75 | Buchanan, 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, 8.4 hours before the alert went out and 273 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
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KALO 062025
SVRALO
IAC019-062115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
325 PM CDT MON JUL 6 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 415 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN NORTHEAST IOWA
...SOUTHWESTERN BUCHANAN
AT 325PM WEATHER RADAR AT WATERLOO INDICATED A SEVERE THUNDERSTORM
IN EXTREME SOUTHEAST BLACK HAWK COUNTY IN IOWA THIS STORM WILL
PRODUCE LARGE HAIL AND DAMAGING WINDS AS IT MOVES INTO BUCHANAN
COUNTY.
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.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, 9:44 AM CDT, 5 hours 41 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 944 AM CDT MON JUL 6 1987 AT 935 AM CDT... A SMALL CLUSTER OF STRONG THUNDERSTORMS WAS LOCATED OVER NORTHEAST AND EAST CENTRAL IOWA...BETWEEN WATERLOO...CEDAR RAPIDS AND TAMA. THE STRONGEST STORMS WERE LOCATED 15 MILES SOUTH AND SOUTHEAST OF WATERLOO AND 15 MILES NORTHWEST OF CEDAR RAPIDS. THESE STORMS WERE PRODUCING BRIEF VERY HEAVY RAIN AND COULD STILL PRODUCzE SOME SMALL HAIL ALONG WITH GUSTY WINDS. ELSEWHERE SHOWERS WERE SCATTERED OVER CENTRAL AND NORTH CENTRAL IOWA ...NEAR THE MASON CITY...ALGONA AND IOWA FALLS AREAS. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR. BARLOW
Special weather statement, Jul 6, 10:42 AM CDT, 4 hours 43 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1041 AM CDT MON JUL 6 1987 AT 1035 AM CDT... A SMALL CLUSTER OF SHOWERS AND STRONG THUNDERSTORMS PERSISTED OVER NORTHEAST AND EAST CENTRAL IOWA...WITH THE STRONGEST STORM LOCATED ABOUT 30 MILES WEST NORTHWEST OF DUBUQUE...NEAR MANCHESTER. BRIEF HEAVY RAIN AND SOME SMALL HAIL IS STILL POSSIBLE WITH THIS STORM. WEAKER THUNDERSHOWERS WERE SCATTERED BETWEEN WATERLOO...MARSHALLTOWN AND CEDAR RAPIDS. A SMALL AREA OF LIGHT SHOWERS LINGERED OVER NORTH CENTRAL IOWA...FROM 65 MILES NORTH OF DES MOINES NEAR IOWA FALLS NORTH TO NEAR MASON CITY AND WEST TO NEAR FORT DODGE. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 30 MILES AND HOUR. BARLOW
Special weather statement, Jul 6, 11:52 AM CDT, 3 hours 33 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1147 AM CDT MON JUL 6 1987 AT 1135 AM CDT... SCATTERED SHOWERS AND ISOLATED STRONG THUNDERSTORMS PERSISTED OVER THE NORTHEAST THIRD OF IOWA. THE STRONGEST STORMS WERE LOCATED 40 MILES WEST OF THE DUBUQUE AREA OR JUST SOUTHEAST OF MANCHESTER... AND 25 MILES NORTHEAST OF CEDAR RAPIDS NEAR CENTRAL CITY. BRIEF HEAVY RAIN...WIND GUSTS OF 30 TO 40 MILES AN HOUR AND SOME SMALL HAIL ARE POSSIBLE WITH THESE STORMS. LIGHTER SHOWERS WERE LOCATED NORTHWEST OF WATERLOO AROUND THE HAMPTON...IOWA FALLS AND ACKLEY AREAS. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 25 MILES AN HOUR. BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 2:31 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 59 min |
| Jul 6, 3:22 PM CDT | Severe Thunderstorm Warning | DMX | Benton, Linn | 38 min |
| Jul 6, 3:58 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 47 min |
| Jul 6, 4:30 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 45 min |
| Jul 6, 5:16 PM CDT | Severe Thunderstorm Warning | DMX | Johnson, Linn | 44 min |
| Jul 6, 6:09 PM CDT | Severe Thunderstorm Warning | DMX | Johnson | 41 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.