Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 86, NWS Twin Cities, MN

August 19, 2009Redwood County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 19, 2009, 5:18 PM CDT for Redwood County, Minnesota. It was in force for 21 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
Aug 19, 2009, 5:18 PM CDT (22:18 UTC)
Expired
Aug 19, 2009, 5:39 PM CDT
In force
21 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

County Redwood County, MN

The radar

The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 22:20 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 12:00Z, 10.3 hours before the alert went out and 145 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 2009-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 368 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2009-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.19395878Sfc1 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
368 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
615 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
68 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KMPX 192218
SVRMPX
MNC127-192300-
/O.NEW.KMPX.SV.W.0086.090819T2218Z-090819T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
518 PM CDT WED AUG 19 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL REDWOOD COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 600 PM CDT

* AT 517 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
  THIS STORM WAS LOCATED 5 MILES WEST OF WANDA...OR ABOUT 19 MILES
  SOUTHWEST OF REDWOOD FALLS...AND MOVING EAST AT 15 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  WANDA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

REPORT ANY SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4425 9535 4433 9540 4439 9530 4438 9507
      4423 9511
TIME...MOT...LOC 2218Z 254DEG 11KT 4430 9530

$$
1 follow-up statement
000 
WWUS53 KMPX 192239
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
539 PM CDT WED AUG 19 2009

MNC127-192249-
/O.CAN.KMPX.SV.W.0086.000000T0000Z-090819T2300Z/
REDWOOD MN-
539 PM CDT WED AUG 19 2009

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL REDWOOD COUNTY IS
CANCELLED...

RADAR INDICATED THAT THE SEVERE STORM HAD WEAKENED. THEREFORE...THE 
SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

MORE SEVERE THUNDERSTORMS ARE POSSIBLE THROUGH THIS EVENING.

LAT...LON 4425 9535 4433 9540 4439 9530 4438 9507
      4423 9511
TIME...MOT...LOC 2239Z 254DEG 11KT 4432 9521

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 11:39 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Stevens, Swift36 min
Aug 19, 12:20 AM CDTSpecial Weather StatementMPXSwift40 min
Aug 19, 12:41 AM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Swift34 min
Aug 19, 12:59 AM CDTSpecial Weather StatementMPXSwift46 min
Aug 19, 1:18 AM CDTSpecial Weather StatementMPXKandiyohi42 min
Aug 19, 2:16 AM CDTAreal Flood AdvisoryMPXChippewa, Kandiyohi, Lac qui Parle, Meeker, Swift5 hr
Aug 19, 1:04 PM CDTAreal Flood AdvisoryMPXAnoka, Carver, Chisago, Hennepin, Isanti, Kanabec and 7 more6 hr
Aug 19, 2:11 PM CDTTornado WarningMPXAnoka, Hennepin, Ramsey34 min
Aug 19, 2:16 PM CDTTornado WarningMPXDakota29 min
Aug 19, 2:53 PM CDTTornado WarningMPXDakota, Ramsey, Washington22 min
Aug 19, 3:16 PM CDTTornado WarningMPXAnoka, Ramsey, Washington29 min
Aug 19, 3:46 PM CDTTornado WarningMPXAnoka, Chisago, Washington29 min
Aug 19, 4:21 PM CDTTornado WarningMPXChisago39 min
Aug 19, 4:49 PM CDTSevere Thunderstorm WarningMPXRedwood, Yellow Medicine41 min
Aug 19, 5:24 PM CDTSpecial Weather StatementMPXChippewa, Swift51 min
Aug 19, 6:02 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood58 min
Aug 19, 6:19 PM CDTTornado WarningMPXBrown26 min
Aug 19, 6:29 PM CDTTornado WarningMPXBrown31 min
Aug 19, 6:39 PM CDTTornado WarningMPXBrown36 min
Aug 19, 6:44 PM CDTSevere Thunderstorm WarningMPXChippewa, Renville44 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2009Every severe thunderstorm warning in 2009

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.