Alert archive / Minnesota / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 66, NWS Twin Cities, MN

July 21, 2014Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 2014, 10:13 PM CDT for Stevens County, Minnesota. It was in force for 47 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, 2014, 10:13 PM CDT (03:13 UTC)
Expired
Jul 21, 2014, 11:00 PM CDT
In force
47 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

County Stevens County, MN

The radar

The Aberdeen radar (KABR), 182 km from the middle of the area, began a volume at 03:16 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
Jul 21, 9:24 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.2 hours before the alert went out and 198 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, Aberdeen, SD at 00:00Z on 2014-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4375 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, Aberdeen, SD at 00:00Z on 2014-07-22The 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
4375 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1069 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.8
Supercell composite
7.6

Open this sounding in Storm Lab

The text

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

556 
WUUS53 KMPX 220313
SVRMPX
MNC149-220400-
/O.NEW.KMPX.SV.W.0066.140722T0313Z-140722T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1013 PM CDT MON JUL 21 2014

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  STEVENS COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 1100 PM CDT

* AT 1012 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM CHARLESVILLE TO 7 MILES NORTHEAST OF COLLIS TO 7
  MILES WEST OF GRACEVILLE...AND MOVING EAST AT 55 MPH.

  HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE...
  MORRIS...LAKE HATTIE...FISH LAKE...DONNELLY...CHOKIO...ALBERTA...
  MORRIS AIRPORT AND HANCOCK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4575 9626 4576 9625 4576 9576 4557 9575
      4542 9575 4540 9620 4541 9626 4570 9627
TIME...MOT...LOC 0313Z 288DEG 48KT 4589 9618 4573 9633
          4560 9657

HAIL...0.88IN
WIND...60MPH

$$

CLF
2 follow-up statements
879 
WWUS53 KMPX 220349
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1049 PM CDT MON JUL 21 2014

MNC149-220400-
/O.CON.KMPX.SV.W.0066.000000T0000Z-140722T0400Z/
STEVENS MN-
1049 PM CDT MON JUL 21 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
STEVENS COUNTY UNTIL 1100 PM CDT...

AT 1047 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 7 MILES EAST OF HOFFMAN TO 10 MILES NORTHEAST OF
MORRIS TO LAKE HATTIE...AND MOVING EAST AT 50 MPH.

HAZARD...60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES.

LOCATIONS IMPACTED INCLUDE...
HANCOCK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4576 9586 4576 9576 4542 9575 4551 9612
TIME...MOT...LOC 0349Z 282DEG 42KT 4581 9561 4567 9572
          4552 9600

HAIL...<.75IN
WIND...60MPH

$$

BORGHOFF
175 
WWUS53 KMPX 220358
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1058 PM CDT MON JUL 21 2014

MNC149-220408-
/O.EXP.KMPX.SV.W.0066.000000T0000Z-140722T0400Z/
STEVENS MN-
1058 PM CDT MON JUL 21 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN STEVENS COUNTY
WILL EXPIRE AT 1100 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 4 AM CDT.

LAT...LON 4576 9586 4576 9576 4542 9575 4551 9612
TIME...MOT...LOC 0358Z 282DEG 42KT 4578 9546 4565 9557
          4550 9585

$$

BORGHOFF

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 10:33 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope42 min
Jul 21, 11:08 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Stearns, Todd67 min
Jul 21, 11:36 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison, Stearns39 min
Jul 22, 12:11 AM CDTSpecial Weather StatementMPXBenton, Isanti, Kanabec, Mille Lacs79 min
Jul 22, 12:47 AM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs58 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2014Every severe thunderstorm warning 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.