Alert archive / Iowa / Tornado Warnings in 1987

Tornado Warning 7, NWS Des Moines, IA

July 14, 1987Buchanan County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 14, 1987, 9:00 PM CDT for Buchanan County, Iowa. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Jul 14, 1987, 9:00 PM CDT (02:00 UTC)
Expired
Jul 14, 1987, 9:30 PM CDT
In force
30 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.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 00:00Z, 2.0 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.

Skew-T log-pSkew-T log-p diagram, Peoria Regional, IL at 00:00Z on 1987-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peoria Regional, IL at 00:00Z on 1987-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
5 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1784 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
43 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KALO 150200
TORALO
IAC019-150230-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
900 PM CDT TUE JUL 14 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL  930 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTHEAST IOWA
          ...BUCHANAN
 
AT 900PM CDT STATE TROOPER REPORTED A TORNADO ON THE GROUND ON
I-380 ALONG THE BLACK HAWK AND BUCHANAN COUNTY LINE.  THIS
TORNADO WAS MOVING NORTHEAST INTO BUCHANAN COUNTY.
 
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSELT ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 14, 7:25 PM CDTSevere Thunderstorm WarningDMXCrawford35 min
Jul 14, 10:15 PM CDTSevere Thunderstorm WarningDMXAdams35 min

Nearby

Tornado Warnings in Iowa, 1987Every tornado warning in 1987Tornadoes 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.