Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 173, NWS Twin Cities, MN

July 21, 2017Douglas County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 2017, 8:50 PM CDT for Douglas County, Minnesota. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 21, 2017, 8:50 PM CDT (01:50 UTC)
Expired: Jul 21, 2017, 9:30 PM CDT
In force: 40 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Douglas County, MN

The radar

The Minneapolis radar (KMPX), 204 km from the middle of the area, began a volume at 01:51 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.

What was reported inside it

Time	Report	Where	Remark
Jul 21, 9:00 PM CDT	HAIL 0.75	3 Sw Evansville, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 21, 7:34 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.8 hours before the alert went out and 202 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: 337 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

211 
WUUS53 KMPX 220150
SVRMPX
MNC041-220230-
/O.NEW.KMPX.SV.W.0173.170722T0150Z-170722T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
850 PM CDT FRI JUL 21 2017

The National Weather Service in The Twin Cities has issued a

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

* Until 930 PM CDT

* At 849 PM CDT, a severe thunderstorm was located near Erdahl, or 20
  miles northwest of Alexandria, moving east at 30 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* This severe thunderstorm will be near,
  Evansville around 900 PM CDT. 
  Brandon around 910 PM CDT. 

Other locations impacted by this severe thunderstorm include
Garfield, Millerville, Melby and Leaf Valley.

This includes Interstate 94 in Minnesota between mile markers 81 and
97.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4610 9557 4611 9526 4581 9557 4588 9576
      4611 9577
TIME...MOT...LOC 0149Z 289DEG 24KT 4602 9577 

HAIL...1.00IN
WIND...60MPH
 
$$

LS

3 follow-up statements

321 
WWUS53 KMPX 220202
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
902 PM CDT FRI JUL 21 2017

MNC041-220230-
/O.CON.KMPX.SV.W.0173.000000T0000Z-170722T0230Z/
Douglas MN-
902 PM CDT FRI JUL 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR WESTERN DOUGLAS COUNTY...

At 901 PM CDT, a severe thunderstorm was located over Brandon, or 13
miles west of Alexandria, moving southeast at 30 mph.

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

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

This severe storm will be near...
  Brandon around 905 PM CDT. 

Other locations impacted by this severe thunderstorm include
Garfield, Millerville, Melby and Leaf Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4610 9557 4611 9526 4581 9557 4588 9576
      4611 9577
TIME...MOT...LOC 0201Z 299DEG 27KT 4595 9564 

HAIL...1.00IN
WIND...60MPH
 
$$

LS

025 
WWUS53 KMPX 220210
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
910 PM CDT FRI JUL 21 2017

MNC041-220230-
/O.CON.KMPX.SV.W.0173.000000T0000Z-170722T0230Z/
Douglas MN-
910 PM CDT FRI JUL 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR WESTERN DOUGLAS COUNTY...

At 910 PM CDT, a severe thunderstorm was located over Garfield, or 7
miles west of Alexandria, moving southeast at 35 mph.

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

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

this severe thunderstorm will remain over mainly rural areas of
western Douglas County, including the following locations: Garfield,
Millerville and Leaf Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4610 9557 4603 9534 4581 9557 4588 9576
TIME...MOT...LOC 0210Z 299DEG 31KT 4591 9553 

HAIL...1.00IN
WIND...60MPH
 
$$

LS

611 
WWUS53 KMPX 220221
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
921 PM CDT FRI JUL 21 2017

MNC041-220231-
/O.EXP.KMPX.SV.W.0173.000000T0000Z-170722T0230Z/
Douglas MN-
921 PM CDT FRI JUL 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN DOUGLAS COUNTY WILL
EXPIRE AT 930 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 200 AM CDT for
west central Minnesota.

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 4603 9534 4581 9557 4588 9576
TIME...MOT...LOC 0221Z 289DEG 24KT 4589 9544 

$$

LS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 8:28 PM CDT	Special Weather Statement	MPX	Todd	47 min
Jul 21, 9:14 PM CDT	Special Weather Statement	MPX	Douglas	46 min
Jul 21, 10:01 PM CDT	Special Weather Statement	MPX	Pope	44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.