Alert archive / Minnesota / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 48, NWS Grand Forks, ND

September 11, 1990Koochiching County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 11, 1990, 6:15 PM CDT for Koochiching County, Minnesota. It was in force for 45 min.

The area

The counties it named.

The facts

Issued
Sep 11, 1990, 6:15 PM CDT (23:15 UTC)
Expired
Sep 11, 1990, 7:00 PM CDT
In force
45 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Koochiching 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

International Fa, MN (KINL), launched 12:00Z, 11.3 hours before the alert went out and 51 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, International Fa, MN at 12:00Z on 1990-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, International Fa, MN at 12:00Z on 1990-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1705 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
162 m²/s²
0-3 km storm-relative helicity
204 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 KINL 112319
SVRINL
MNC007-071-260300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INTERNATIONAL FALLS MN
615 PM CDT TUE SEP 11 1990

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PORTION OF CENTRAL
AND NORTHERN MINNESOTA UNTIL 1100 PM CDT...

THE NATIONAL WEATHER SERVICE IN INTERNATIONAL FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE  
IN THE FOLLOWING COUNTIES...

IN NORTH CENTRAL MINNESOTA
          ...NORTHERN 1/2 OF KOOCHICHING...

AT 608 PM CDT THIS TUESDAY EVENING A SEVERE THUNDERSTORM WAS
INDICATED BY RADAR OVER THE INTERNATIONAL FALLS MINNESOTA AREA MOVING
EAST AT 30 MPH.

3/4 INCH HAIL WAS REPORTED IN THE CITY OF INTERNATIONAL FALLS.

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.                                   
                                                  
BOATERS AND OTHER OUTDOOR ENTHUSIASTS...SHOULD SEEK SHELTER IF
THUNDERSTORMS APPROACH. KEEP TUNED TO NOAA WEATHER RADIO...YOUR
FAVORITE AM/FM RADIO OR TV STATIONn IN THE EVENT FURTHER WARNINGS
ARE REQUIRED.

CARROLL

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 11, 5:40 PM CDT, 35 minutes before
NDZ012-013-014-015-016-017-018-MNZ001-006-007-010-011-013-112330-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
535 PM CDT TUE SEP 11 1990

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR A LARGE PORTION OF CENTRAL
   AND NORTHERN MINNESOTA UNTIL 11 PM CDT...

AT 526 PM CDT...AN AREA OF SCATTERED INTENSE THUNDERSTORMS...SOME WITH
VERY HEAVY RAIN HAD DEVELOPED OVER NORTHWEST MINNESOTA AND A SMALL
PART OF EXTREME EAST CENTRAL NORTH DAKOTA.

THE MOST INTENSE THUNDERSTORMS WERE OVER CENTRAL RED LAKE COUNTY OF
NORTHWEST MINNESOTA JUST EAST OF RED LAKE FALLS OR 15 TO 20 MILES
SOUTHEAST OF THIEF RIVER FALLS. THESE THUNDERSTORMS WERE MOVING EAST
AT 35 MILES AN HOUR AN SHOULD MOVE INTO EXTREME EASTERN RED LAKE COUNTY
AND INTO EXTREME NORTHERN CLEARWATER AND SOUTHWEST BELTRAMI COUNTIES
OF NORTHWEST MINNESOTA BY 630 PM. THESE INTENSE THUNDERSTORMS WILL
LIKELY CONTAIN VERY HEAVY RAIN...SMALL HAIL...STRONG WINDS AND DANGEROUS
LIGHTNING.
.
OTHER SCATTERED SHOWERS AND THUNDERSTORMS...SOME WITH HEAVY RAIN
WERE OVER A 30 MILE WIDE AREA FROM 30 MILES NORTHEAST OF THIEF
RIVER FALLS IN NORTHWEST MINNESOTA...SOUTHWEST INTO EXTREME EAST
CENTRAL NORTH DAKOTA JUST NORTHWEST OF FARGO/MOORHEAD.

ALL SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 35 MILES AN HOUR
AND WILL MOST LIKELY CONTINUE TO DEVELOP OVER THIS AREA INTO THE
EVENING HOURS AND MAY INTENSIFY AS THEY MOVE EAST.

STAY TUNED FOR FURTHER STATEMENTS AND POSSIBLY WARNINGS.
SPIES

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 11, 6:32 PM CDTSevere Thunderstorm WarningFGFBeltrami58 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.