Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 115, NWS Twin Cities, MN

July 13, 1997Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 13, 1997, 12:36 AM CDT for Chisago County, Minnesota. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 13, 1997, 12:36 AM CDT (05:36 UTC)
Expired
Jul 13, 1997, 1:15 AM CDT
In force
39 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Chisago County, MN

The radar

The Minneapolis radar (KMPX), 89 km from the middle of the area, began a volume at 05:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.6 hours before the alert went out and 91 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 1997-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3789 joules per kilogram.LCLEL10008507005003002001001 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 1997-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 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
3789 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
203 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.

214 
WUUS1 KMSP 130540
SVRMSP
MNC025-130615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1236 AM CDT SUN JUL 13 1997

* SEVERE THUNDERSTORM WARNING FOR
  NORTHERN CHISAGO COUNTY - EAST CENTRAL MINNESOTA

* UNTIL 115 AM CDT
 
* SOME LOCATIONS AFFECTED
    GRANDY
    SPRING LAKE
    NORTH BRANCH
    RUSH CITY

* AT 1230 AM CDT DOPPLER RADAR INDICATED SEVERE STORMS NEAR
  CAMBRIDGE.  THE STORMS WERE MOVING NORTHEAST AT 30 MPH.

DAMAGING WINDS WITH TREES DOWN WERE REPORTED AT ISANTI IN ISANTI
COUNTY.  WIND GUSTS TO 50 MPH WERE REPORTED CAMBRIDGE BY THE ISANTI
COUNTY SHERIFF.  THIS IS A DANGEROUS STORM. STAY INDOORS AWAY FROM
WINDOWS.


MCBEATH PETERS
 

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 4:27 PM CDTSevere Thunderstorm WarningMPXChippewa, Yellow Medicine33 min
Jul 13, 5:00 PM CDTSevere Thunderstorm WarningMPXChippewa, Yellow Medicine45 min
Jul 13, 5:35 PM CDTSevere Thunderstorm WarningMPXWatonwan40 min
Jul 13, 6:01 PM CDTSevere Thunderstorm WarningMPXRedwood44 min
Jul 13, 6:15 PM CDTSevere Thunderstorm WarningMPXBrown45 min
Jul 13, 6:19 PM CDTSevere Thunderstorm WarningMPXKandiyohi56 min
Jul 13, 6:43 PM CDTTornado WarningMPXNicollet47 min
Jul 13, 6:47 PM CDTSevere Thunderstorm WarningMPXMeeker58 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1997Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.