Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 191, NWS Twin Cities, MN

September 15, 2017Douglas County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 15, 2017, 3:42 PM CDT for Douglas County, Minnesota. It was in force for 15 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 15, 2017, 3:42 PM CDT (20:42 UTC)
Expired: Sep 15, 2017, 3:57 PM CDT
In force: 15 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Douglas County, MN

The radar

The Minneapolis radar (KMPX), 206 km from the middle of the area, began a volume at 20:46 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, 8.7 hours before the alert went out and 204 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 194 J/kg
Mixed-layer CIN: -478 J/kg
Mixed-layer LCL: 1352 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

475 
WUUS53 KMPX 152042
SVRMPX
MNC041-152115-
/O.NEW.KMPX.SV.W.0191.170915T2042Z-170915T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
342 PM CDT FRI SEP 15 2017

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northwestern Douglas County in west central Minnesota...

* Until 415 PM CDT

* At 342 PM CDT, a severe thunderstorm was located over Evansville,
  or 16 miles northwest of Alexandria, moving northeast at 45 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* This severe thunderstorm will remain over mainly rural areas of
  northwestern Douglas County, including the following locations:
  Millerville and Leaf Valley.

This includes Interstate 94 in Minnesota between mile markers 81 and
90.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4610 9557 4611 9532 4598 9551 4587 9575
      4602 9577 4611 9566
TIME...MOT...LOC 2042Z 216DEG 39KT 4600 9567 

HAIL...1.00IN
WIND...<50MPH
 
$$

LS

1 follow-up statement

233 
WWUS53 KMPX 152057
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
357 PM CDT FRI SEP 15 2017

MNC041-152106-
/O.CAN.KMPX.SV.W.0191.000000T0000Z-170915T2115Z/
Douglas MN-
357 PM CDT FRI SEP 15 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN DOUGLAS COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
The Twin Cities.

LAT...LON 4610 9557 4611 9532 4598 9551 4587 9575
      4602 9577 4611 9566
TIME...MOT...LOC 2054Z 216DEG 39KT 4613 9553 

$$

LS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 11:00 AM CDT	Special Weather Statement	MPX	Pope, Swift	45 min
Sep 15, 11:54 AM CDT	Special Weather Statement	MPX	Todd	51 min
Sep 15, 3:37 PM CDT	Special Weather Statement	MPX	Douglas	23 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017 Every 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.