Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 70, NWS Twin Cities, MN

July 18, 20207 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 2020, 12:26 AM CDT for 7 counties in Minnesota. It was in force for 49 min. 8 reports 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 18, 2020, 12:26 AM CDT (05:26 UTC)
Expired: Jul 18, 2020, 1:15 AM CDT
In force: 49 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Benton County, MN, Isanti County, MN, Meeker County, MN, Mille Lacs County, MN, Sherburne County, MN, Stearns County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 79 km from the middle of the area, began a volume at 05:26 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 18, 12:41 AM CDT	TSTM WND GST 66	2 Nw Foreston, MN	MESONET STATION EW9116 FORESTON.
Jul 18, 12:45 AM CDT	TSTM WND DMG	1 S Milaca, MN	FARM EQUIPMENT THROWN AROUND. SEVERAL 800 POUND BALES OF HAY BLOWN AROUND.
Jul 18, 12:55 AM CDT	TSTM WND DMG	1 N Becker, MN	ABOUT TEN TREES DOWN, INCLUDING ONE ON A HOUSE.
Jul 18, 12:59 AM CDT	TORNADO	9 Sse Ogilvie, MN	THIS EF1 TORNADO WAS EMBEDDED WITHIN A LINE OF SEVERE THUNDERSTORMS PRODUCING STRAIGHT LINE WIND DAMAGE, BUT A CONCENTRATED AREA OF DAMAGE EXHIBITING TORNADO CHARACTERISTICS TRACKED ACROSS NORTHWESTERN ISANTI COUNTY. A LOCAL ANEMOMETER MEASURED AN 87 MPH GUST.
Jul 18, 1:07 AM CDT	TSTM WND DMG	6 Wsw Braham, MN	NUMEROUS TREES DOWN ACROSS NORTH CENTRAL AND NORTHEAST ISANTI COUNTY IN A SWATH ABOUT TWO MILES WIDE. SOME OF THE HARDEST HIT AREAS WERE WEST OF STANCHFIELD, EXTENDING TO EAST OF STANCHFIELD AT THE COUNTY LINE BY 120 AM. SEVERAL SHEDS WERE BLOWN DOWN. SURVEY S
Jul 18, 1:10 AM CDT	TSTM WND DMG	7 W Braham, MN	LARGE OAK TREE (ROUGHLY 2 FT IN DIAMETER) SNAPPED NEAR BASE. TIME ESTIMATED FROM RADAR.
Jul 18, 1:15 AM CDT	TSTM WND DMG	10 Nne Spencer Brook, MN	SEVERAL TREES DOWN IN DALBO.
Jul 18, 1:15 AM CDT	TSTM WND DMG	4 S Braham, MN	AT LEAST ONE DOZEN TREES DOWN AND POWER OUT IN STANCHFIELD PER LAW ENFORCEMENT AND SOCIAL MEDIA.

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 17, 5:39 PM CDT	Severe Thunderstorm Watch PDS	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.4 hours before the alert went out and 78 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: 1995 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1267 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

As transmitted.

368 
WUUS53 KMPX 180526
SVRMPX
MNC009-059-093-095-141-145-171-180615-
/O.NEW.KMPX.SV.W.0070.200718T0526Z-200718T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
1226 AM CDT Sat Jul 18 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northwestern Wright County in central Minnesota...
  Northeastern Meeker County in central Minnesota...
  Southern Mille Lacs County in east central Minnesota...
  Isanti County in east central Minnesota...
  Southeastern Benton County in central Minnesota...
  Sherburne County in central Minnesota...
  Southeastern Stearns County in central Minnesota...

* Until 115 AM CDT.

* At 1226 AM CDT, severe thunderstorms were located along a line
  extending from 9 miles north of Foley to near St. Cloud to near
  Paynesville, moving southeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  St. Cloud, Milaca and Foreston around 1240 AM CDT.
  Clearwater, Clear Lake and Bock around 1245 AM CDT.
  Watkins around 1250 AM CDT.
  Princeton, Becker and Kimball around 1255 AM CDT.
  Elk River, Big Lake, Zimmerman and Annandale around 105 AM CDT.
  St. Francis around 110 AM CDT.
  Cambridge and Maple Lake around 115 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

LAT...LON 4578 9351 4573 9351 4573 9314 4558 9314
      4541 9348 4541 9351 4539 9351 4535 9359
      4511 9437 4533 9477 4553 9415 4556 9414
      4558 9400 4566 9376 4581 9376
TIME...MOT...LOC 0526Z 295DEG 43KT 4580 9393 4560 9424 4543 9475 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 9:08 PM CDT	Special Weather Statement	MPX	Douglas	67 min
Jul 17, 9:22 PM CDT	Severe Thunderstorm Warning	MPX	Todd	53 min
Jul 17, 10:13 PM CDT	Severe Thunderstorm Warning	MPX	Morrison, Todd	62 min
Jul 17, 10:16 PM CDT	Tornado Warning	MPX	Morrison, Todd	44 min
Jul 17, 10:20 PM CDT	Severe Thunderstorm Warning	MPX	Douglas	55 min
Jul 17, 10:54 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens	66 min
Jul 17, 10:58 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison, Stearns, Todd	77 min
Jul 17, 11:51 PM CDT	Tornado Warning	MPX	Pope, Stearns, Swift	28 min
Jul 17, 11:58 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Kandiyohi, Morrison, Stearns	77 min
Jul 18, 12:13 AM CDT	Special Weather Statement	MPX	Kanabec, Mille Lacs	62 min
Jul 18, 12:32 AM CDT	Special Weather Statement	MPX	Lac qui Parle, Swift	43 min
Jul 18, 12:44 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Lac qui Parle, Renville, Swift, Yellow Medicine	61 min
Jul 18, 1:03 AM CDT	Tornado Warning	MPX	Chisago, Isanti, Kanabec	27 min
Jul 18, 1:16 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker, Stearns	44 min
Jul 18, 1:19 AM CDT	Special Weather Statement	MPX	Anoka, Chisago, Hennepin, Isanti, Wright	56 min
Jul 18, 1:38 AM CDT	Special Weather Statement	MPX	McLeod, Meeker, Redwood, Renville	52 min
Jul 18, 3:03 AM CDT	Severe Thunderstorm Warning	MPX	Carver, Dakota, Hennepin, Scott, Washington	42 min
Jul 18, 3:43 AM CDT	Special Weather Statement	MPX	Goodhue, Rice	32 min
Jul 18, 4:06 AM CDT	Special Weather Statement	MPX	Watonwan	39 min
Jul 18, 5:09 AM CDT	Special Weather Statement	MPX	Freeborn, Steele, Waseca	66 min
Jul 18, 5:00 PM CDT	Special Weather Statement	MPX	Anoka	30 min
Jul 18, 5:23 PM CDT	Severe Thunderstorm Warning	MPX	Anoka	52 min
Jul 18, 5:48 PM CDT	Tornado Warning	MPX	Anoka	42 min
Jul 18, 6:07 PM CDT	Tornado Warning	MPX	Washington	38 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020 Every severe thunderstorm warning in 2020

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.