Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 358, NWS Twin Cities, MN

September 20, 2007Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2007, 10:14 AM CDT for Swift County, Minnesota. It was in force for 31 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, 2007, 10:14 AM CDT (15:14 UTC)
Expired: Sep 20, 2007, 10:45 AM CDT
In force: 31 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Swift County, MN

The radar

The Minneapolis radar (KMPX), 156 km from the middle of the area, began a volume at 15:17 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, 3.2 hours before the alert went out and 154 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 201514
SVRMPX
MNC151-201545-
/O.NEW.KMPX.SV.W.0358.070920T1514Z-070920T1545Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1014 AM CDT THU SEP 20 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 1045 AM CDT

* AT 1012 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS STORM WAS LOCATED NEAR
  DE GRAFF...OR ABOUT 6 MILES SOUTHEAST OF BENSON...AND MOVING
  NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DE GRAFF...
  MURDOCK...
  KERKHOVEN...
  SWIFT FALLS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 4541 9544 4534 9527 4518 9525 4516 9558
      4524 9574
TIME...MOT...LOC 1514Z 229DEG 20KT 4526 9549

$$

LS/MDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 7:33 AM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	42 min
Sep 20, 8:11 AM CDT	Tornado Warning	MPX	Lac qui Parle, Yellow Medicine	34 min
Sep 20, 8:36 AM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle	39 min
Sep 20, 8:43 AM CDT	Tornado Warning	MPX	Lac qui Parle, Yellow Medicine	47 min
Sep 20, 9:14 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift	61 min
Sep 20, 10:28 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Swift	47 min
Sep 20, 10:44 AM CDT	Severe Thunderstorm Warning	MPX	Swift	46 min
Sep 20, 10:58 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift	44 min
Sep 20, 11:31 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Stearns, Swift	59 min
Sep 20, 12:16 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi	38 min
Sep 20, 12:26 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope	64 min
Sep 20, 1:04 PM CDT	Flash Flood Watch	MPX	Anoka, Benton, Carver, Chippewa, Chisago, Dakota and 23 more	18 hr
Sep 20, 1:05 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Stearns, Wright	27 min
Sep 20, 1:14 PM CDT	Severe Thunderstorm Warning	MPX	Morrison, Stearns, Todd	61 min
Sep 20, 1:51 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs, Morrison	54 min
Sep 20, 2:01 PM CDT	Flash Flood Warning	MPX	Benton, Mille Lacs, Morrison, Pope, Stearns, Todd	6 hr
Sep 20, 2:20 PM CDT	Tornado Warning	MPX	Benton, Sherburne, Stearns	25 min
Sep 20, 2:42 PM CDT	Tornado Warning	MPX	Benton, Sherburne	33 min
Sep 20, 2:44 PM CDT	Tornado Warning	MPX	Chippewa, Kandiyohi, Renville	46 min
Sep 20, 2:47 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison	58 min
Sep 20, 2:57 PM CDT	Tornado Warning	MPX	Benton, Mille Lacs, Sherburne	33 min
Sep 20, 3:13 PM CDT	Severe Thunderstorm Warning	MPX	Isanti	16 min
Sep 20, 3:27 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs, Morrison	63 min
Sep 20, 3:28 PM CDT	Tornado Warning	MPX	Kandiyohi, Meeker	47 min
Sep 20, 3:54 PM CDT	Tornado Warning	MPX	Kanabec, Mille Lacs	35 min
Sep 20, 4:11 PM CDT	Tornado Warning	MPX	Kanabec, Mille Lacs	25 min
Sep 20, 4:13 PM CDT	Tornado Warning	MPX	Kandiyohi, Meeker	47 min
Sep 20, 4:42 PM CDT	Severe Thunderstorm Warning	MPX	Wright	63 min
Sep 20, 5:07 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin	53 min
Sep 20, 5:30 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Ramsey, Scott	60 min
Sep 20, 5:47 PM CDT	Tornado Warning	MPX	Hennepin, Scott	31 min
Sep 20, 6:01 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin	29 min
Sep 20, 6:07 PM CDT	Severe Thunderstorm Warning	MPX	Washington	53 min
Sep 20, 6:11 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne, Wright	34 min
Sep 20, 6:14 PM CDT	Tornado Warning	MPX	Dakota, Washington	31 min
Sep 20, 6:30 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin	60 min
Sep 20, 6:51 PM CDT	Severe Thunderstorm Warning	MPX	Wright	39 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2007 Every severe thunderstorm warning in 2007

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.