Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 87, NWS Twin Cities, MN

July 5, 1986Sherburne County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 5, 1986, 4:45 PM CDT for Sherburne County, Minnesota. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 5, 1986, 4:45 PM CDT (21:45 UTC)
Expired
Jul 5, 1986, 5:45 PM CDT
In force
60 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Sherburne County, MN

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, 9.8 hours before the alert went out and 67 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, Minneapolis, MN at 12:00Z on 1986-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2042 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, Minneapolis, MN at 12:00Z on 1986-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 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
2042 J/kg
Mixed-layer CIN
-230 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
150 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

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 5, 3:15 PM CDT, 1 hour 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
345 PM CDT SAT JUL 5 1986.

...TORNADO WATCH 400 PM CDT TO 1000  PM CDT...
...STRONG THUNDERSTORMS IN CENTRAL MINNESOTA...

AT 345 PM CDT RADAR  SHOWED A RAPIDLY DEVELOPING LINE OF STRONG
THUNDERSTORMS IN CENTRAL MINNESOTA EXTENDING FROM BRAINERD TO WILMAR.

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LOCALLY HEAVY RAIN..HAIL
AND VERY GUSTY WINDS.

THE THUNDERSTORMS WERE MOVING EAST NORTHEAST AT 25 MPH.

ALTHOUGH NO SEVERE WEATHER HAS BEEN REPORTED YOU SHOULD BE PREPARED
TO GO TO A PLACE OF SAFETY IF THREATENING WEATHER APPROACHES.

YOUNG/FRASER

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 4:15 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison60 min
Jul 5, 5:17 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Wright53 min
Jul 5, 5:30 PM CDTSevere Thunderstorm WarningMPXSherburne60 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986Every severe thunderstorm warning in 1986

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.