Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 40, NWS Duluth, MN

September 5, 1990Sawyer County, Washburn County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Sep 5, 1990, 8:20 PM CDT for Sawyer County, Washburn County, Wisconsin. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Sep 5, 1990, 8:20 PM CDT (01:20 UTC)
Expired
Sep 5, 1990, 9:15 PM CDT
In force
55 min
Issued by
NWS Duluth, MN
Area
Whole counties

Counties Sawyer County, WI, Washburn County, WI

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 00:00Z, 1.3 hours before the alert went out and 203 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 00:00Z on 1990-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3941 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 00:00Z on 1990-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 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
3941 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
933 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
228 m²/s²
0-3 km storm-relative helicity
306 m²/s²
Significant tornado parameter
4.6
Supercell composite
25.7

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, Sep 5, 5:28 PM CDT, 2 hours 52 minutes before
MNZ003-004-008-009-052330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
528 PM CDT WED SEP 5 1990

AT 525 PM CDT DULUTH RADAR DETECTED SOME STRONG THUNDERSTORMS OVER
SOUTHEAST ITASCA COUNTY AND NORTHERN AITKIN COUNTY.  THESE THUNDERSTORMS
EXTENDED FROM NEAR SWAN RIVER IN SOUTHEAST ITASCA COUNTY TO THE SHOVEL
LAKE AREA IN NORTHWEST AITKIN COUNTY.

THESE THUNDERSTORMS HAVE THE POTENTIAL TO CAUSE STRONG GUSTY WINDS...
HAIL...FREQUENT LIGHTNING STRIKES AND HEAVY DOWNPOURS.

PERSONS IN SOUTHEAST ITASCA COUNTY...NORTHERN AITKIN COUNTY AND
SOUTHWEST ST LOUIS COUNTY AREA URGED TO SEEK SAFE SHELTER SHOULD
THEY SEE A THUNDERSTORM APPROACHING.

MOVEMENT WAS TO THE EAST AT ABOUT 30 MaPH.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 7:10 PM CDTSevere Thunderstorm WarningDLHPine65 min
Sep 5, 8:00 PM CDTSevere Thunderstorm WarningDLHPine60 min
Sep 6, 12:44 AM CDTFlash Flood WarningDLHCarlton2 hr
Sep 6, 2:36 AM CDTFlash Flood WarningDLHCarlton3 hr
Sep 6, 6:00 AM CDTFlash Flood WarningDLHCarlton2 hr
Sep 6, 6:00 AM CDTFlash Flood WarningDLHSaint Louis2 hr
Sep 5, 8:20 PM CDTSevere Thunderstorm WarningDLHBurnett55 min
Sep 5, 10:00 PM CDTSevere Thunderstorm WarningDLHBurnett, Washburn45 min
Sep 6, 1:53 AM CDTFlash Flood WarningDLHDouglas2 hr
Sep 6, 3:55 AM CDTFlash Flood WarningDLHDouglas2 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1990Every severe thunderstorm warning in 1990

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.