Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 200, NWS Twin Cities, MN

September 20, 20174 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2017, 1:37 AM CDT for 4 counties in Minnesota. It was in force for 38 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
Sep 20, 2017, 1:37 AM CDT (06:37 UTC)
Expired
Sep 20, 2017, 2:15 AM CDT
In force
38 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Tornado
Possible
Hail
0.88 in
Wind
60.0 mph

Counties Meeker County, MN, Sherburne County, MN, Stearns County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 64 km from the middle of the area, began a volume at 06:39 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 watch it was issued in

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

IssuedProductOfficeLasted
Sep 19, 10:36 PM CDTSevere Thunderstorm WatchSPC4 hr
Sep 20, 1:22 AM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.6 hours before the alert went out and 62 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 2017-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 246 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 00:00Z on 2017-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 274 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
246 J/kg
Mixed-layer CIN
-155 J/kg
Mixed-layer LCL
1179 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
454 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.2

Open this sounding in Storm Lab

The text

As transmitted.

518 
WUUS53 KMPX 200637
SVRMPX
MNC093-141-145-171-200715-
/O.NEW.KMPX.SV.W.0200.170920T0637Z-170920T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
137 AM CDT WED SEP 20 2017

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Wright County in central Minnesota...
  Eastern Meeker County in central Minnesota...
  Northwestern Sherburne County in central Minnesota...
  Southeastern Stearns County in central Minnesota...

* Until 215 AM CDT

* At 137 AM CDT, severe thunderstorms were located along a line
  extending from near Rockville to near Forest City to near Lakeside,
  moving northeast at 55 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Severe thunderstorms will be near,
  Dassel around 140 AM CDT. 
  Kimball around 150 AM CDT. 
  St. Cloud and Annandale around 155 AM CDT. 
  Cokato and Maple Lake around 200 AM CDT. 
  Winsted, Howard Lake, Clearwater and Clear Lake around 205 AM CDT. 

Other locations impacted by these severe thunderstorms include
Enfield, Silver Creek, Fairhaven, South Haven, St Augusta, Smith
Lake, Greenleaf, Darwin, Santiago and French Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4542 9378 4497 9397 4498 9438 4497 9458
      4537 9440 4549 9412 4556 9382 4556 9375
TIME...MOT...LOC 0637Z 241DEG 49KT 4545 9437 4517 9444 4488 9457 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$
1 follow-up statement
038 
WWUS53 KMPX 200714
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
214 AM CDT WED SEP 20 2017

MNC093-141-145-171-200723-
/O.EXP.KMPX.SV.W.0200.000000T0000Z-170920T0715Z/
Wright MN-Meeker MN-Sherburne MN-Stearns MN-
214 AM CDT WED SEP 20 2017

...THE SEVERE THUNDERSTORM WARNING FOR WRIGHT...EASTERN MEEKER...
NORTHWESTERN SHERBURNE AND SOUTHEASTERN STEARNS COUNTIES WILL EXPIRE
AT 215 AM CDT...

The storms which prompted the warning have weakened and moved out of 
the warned area. Therefore, the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 500 AM CDT for
central Minnesota. A severe thunderstorm watch also remains in effect
until 500 AM CDT for central and east central Minnesota.

LAT...LON 4542 9378 4497 9397 4498 9438 4497 9458
      4537 9440 4549 9412 4556 9382 4556 9375
TIME...MOT...LOC 0713Z 270DEG 49KT 4569 9376 4541 9383 4512 9396 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 19, 10:55 PM CDTSevere Thunderstorm WarningMPXLac qui Parle50 min
Sep 19, 11:24 PM CDTSevere Thunderstorm WarningMPXStevens, Swift36 min
Sep 19, 11:42 PM CDTSpecial Weather StatementMPXLac qui Parle, Yellow Medicine48 min
Sep 19, 11:50 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Stevens55 min
Sep 20, 12:03 AM CDTSpecial Weather StatementMPXSwift57 min
Sep 20, 12:06 AM CDTSpecial Weather StatementMPXMeeker24 min
Sep 20, 12:16 AM CDTSpecial Weather StatementMPXChippewa, Yellow Medicine44 min
Sep 20, 12:24 AM CDTSevere Thunderstorm WarningMPXSwift21 min
Sep 20, 12:42 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Pope, Stearns, Todd33 min
Sep 20, 12:45 AM CDTSpecial Weather StatementMPXBenton, Morrison45 min
Sep 20, 12:51 AM CDTSpecial Weather StatementMPXKandiyohi, Meeker, Renville39 min
Sep 20, 12:55 AM CDTSpecial Weather StatementMPXBrown, Redwood35 min
Sep 20, 1:02 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker, Renville43 min
Sep 20, 1:11 AM CDTSevere Thunderstorm WarningMPXBenton, Morrison, Sherburne, Stearns49 min
Sep 20, 1:15 AM CDTSevere Thunderstorm WarningMPXBrown, Nicollet, Redwood, Renville, Sibley30 min
Sep 20, 1:41 AM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley34 min
Sep 20, 1:49 AM CDTSevere Thunderstorm WarningMPXBenton, Kanabec, Mille Lacs, Morrison56 min
Sep 20, 2:00 AM CDTSevere Thunderstorm WarningMPXBenton, Isanti, Mille Lacs, Sherburne45 min
Sep 20, 2:12 AM CDTSpecial Weather StatementMPXAnoka, Hennepin, Wright48 min
Sep 20, 2:36 AM CDTSpecial Weather StatementMPXHennepin, Ramsey, Washington69 min
Sep 20, 2:57 AM CDTSpecial Weather StatementMPXChisago33 min
Sep 20, 3:04 AM CDTSevere Thunderstorm WarningMPXChisago26 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017Every severe thunderstorm warning in 2017

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.