Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 173, NWS Twin Cities, MN

July 21, 2002Todd County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 2002, 7:45 AM CDT for Todd County, Minnesota. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 21, 2002, 7:45 AM CDT (12:45 UTC)
Expired
Jul 21, 2002, 8:15 AM CDT
In force
30 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Todd County, MN

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 0.8 hours before the alert went out and 170 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 2002-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2410 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 2002-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
2410 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
1319 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
94 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.

557 
WUUS53 KMPX 211245
SVRMSP
MNC153-211315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
745 AM CDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN TODD COUNTY IN CENTRAL MINNESOTA

* UNTIL 815 AM CDT

* AT 744 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM
  STAPLES TO GREY EAGLE...MOVING NORTHEAST AT 50 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  BURTRUM.
  GREY EAGLE.
  PHILBROOK.

THIS IS A DANGEROUS STORM WITH DAMAGING WINDS...STAY INDOORS AWAY
FROM WINDOWS.

LAT...LON 4636 9490 4579 9481 4579 9465 4634 9467

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 11:07 PM CDTSevere Thunderstorm WarningMPXMille Lacs38 min
Jul 21, 7:04 AM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Todd41 min
Jul 21, 7:32 AM CDTSevere Thunderstorm WarningMPXMorrison58 min
Jul 21, 2:53 PM CDTFlash Flood WarningMPXAnoka, Hennepin, Wright3 hr
Jul 21, 5:00 PM CDTSevere Thunderstorm WarningMPXFreeborn45 min
Jul 21, 5:32 PM CDTSevere Thunderstorm WarningMPXMartin43 min
Jul 21, 5:48 PM CDTFlash Flood WarningMPXFreeborn3 hr
Jul 21, 6:00 PM CDTFlash Flood WarningMPXFaribault, Martin3 hr
Jul 21, 6:20 PM CDTSevere Thunderstorm WarningMPXFaribault, Martin40 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning in 2002

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.