Alert archive / Minnesota / Tornado Warnings in 2014

Tornado Warning 26, NWS Twin Cities, MN

August 24, 2014Mille Lacs County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 24, 2014, 7:21 PM CDT for Mille Lacs County, Minnesota. It was in force for 24 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 24, 2014, 7:21 PM CDT (00:21 UTC)
Expired
Aug 24, 2014, 7:45 PM CDT
In force
24 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

County Mille Lacs County, MN

The radar

The Minneapolis radar (KMPX), 127 km from the middle of the area, began a volume at 00:20 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 24, 3:45 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.4 hours before the alert went out and 127 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 2014-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2425 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 00:00Z on 2014-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 174 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
2425 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
1141 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
174 m²/s²
0-3 km storm-relative helicity
234 m²/s²
Significant tornado parameter
1.6
Supercell composite
14.7

Open this sounding in Storm Lab

The text

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

802 
WFUS53 KMPX 250021
TORMPX
MNC095-250045-
/O.NEW.KMPX.TO.W.0026.140825T0021Z-140825T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
721 PM CDT SUN AUG 24 2014

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 745 PM CDT

* AT 717 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 11 MILES SOUTHWEST OF ONAMIA...AND MOVING
  NORTHEAST AT 30 MPH.

  HAZARD...TORNADO.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
           TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
           LIKELY.

* THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF NORTHERN
  MILLE LACS COUNTY...INCLUDING THE FOLLOWING LOCATIONS...WAHKON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4615 9350 4598 9351 4590 9376 4591 9377
      4592 9377 4595 9377 4596 9377
TIME...MOT...LOC 0021Z 231DEG 28KT 4594 9374

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JRB
2 follow-up statements
046 
WWUS53 KMPX 250031
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
731 PM CDT SUN AUG 24 2014

MNC095-250045-
/O.CON.KMPX.TO.W.0026.000000T0000Z-140825T0045Z/
MILLE LACS MN-
731 PM CDT SUN AUG 24 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN MILLE LACS COUNTY
UNTIL 745 PM CDT...

AT 728 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 8 MILES SOUTH OF ONAMIA...AND MOVING NORTHEAST AT 30 MPH.

HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
         LIKELY.

LOCATIONS IMPACTED INCLUDE...
WAHKON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4615 9350 4598 9351 4590 9376 4591 9377
      4592 9377 4595 9377 4596 9377
TIME...MOT...LOC 0031Z 241DEG 25KT 4597 9365

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

JRB
492 
WWUS53 KMPX 250041
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
741 PM CDT SUN AUG 24 2014

MNC095-250051-
/O.EXP.KMPX.TO.W.0026.000000T0000Z-140825T0045Z/
MILLE LACS MN-
741 PM CDT SUN AUG 24 2014

...THE TORNADO WARNING FOR NORTHERN MILLE LACS COUNTY WILL EXPIRE AT
745 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 11PM CDT.

LAT...LON 4615 9350 4598 9351 4590 9376 4591 9377
      4592 9377 4595 9377 4596 9377
TIME...MOT...LOC 0041Z 241DEG 25KT 4600 9356

$$

JRB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 7:12 PM CDTSpecial Weather StatementMPXAnoka48 min
Aug 24, 7:29 PM CDTSevere Thunderstorm WarningMPXIsanti, Mille Lacs, Sherburne46 min
Aug 24, 8:00 PM CDTSpecial Weather StatementMPXKanabec30 min
Aug 24, 8:30 PM CDTSpecial Weather StatementMPXAnoka45 min
Aug 24, 9:12 PM CDTSpecial Weather StatementMPXChisago48 min
Aug 24, 9:30 PM CDTSpecial Weather StatementMPXAnoka30 min
Aug 24, 9:47 PM CDTSevere Thunderstorm WarningMPXChisago, Washington43 min

Nearby

Tornado Warnings in Minnesota, 2014Every tornado warning in 2014Tornadoes in 2014

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.