Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 388, NWS Twin Cities, MN

September 21, 2007Wright County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 21, 2007, 5:31 AM CDT for Wright County, Minnesota. It was in force for 44 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 21, 2007, 5:31 AM CDT (10:31 UTC)
Expired: Sep 21, 2007, 6:15 AM CDT
In force: 44 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Wright County, MN

The radar

The Minneapolis radar (KMPX), 61 km from the middle of the area, began a volume at 10:31 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.

Issued	Product	Office	Lasted
Sep 21, 12:00 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 10.5 hours before the alert went out and 59 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: 1394 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 567 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 24.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 211031
SVRMPX
MNC171-211115-
/O.NEW.KMPX.SV.W.0388.070921T1031Z-070921T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
531 AM CDT FRI SEP 21 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 615 AM CDT

* AT 526 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS STORM WAS LOCATED 4
  MILES NORTH OF COKATO...OR ABOUT 15 MILES EAST OF LITCHFIELD...AND
  MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ANNANDALE...
  MONTICELLO...

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.

STAY INDOORS...AND AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 AM CDT FRIDAY MORNING FOR
CENTRAL MINNESOTA.

LAT...LON 4523 9425 4540 9404 4528 9373 4505 9425
TIME...MOT...LOC 1031Z 226DEG 36KT 4517 9417

$$

KAT

1 follow-up statement

000 
WWUS53 KMPX 211106
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
606 AM CDT FRI SEP 21 2007

MNC171-211116-
/O.EXP.KMPX.SV.W.0388.000000T0000Z-070921T1115Z/
WRIGHT MN-
606 AM CDT FRI SEP 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR WRIGHT COUNTY EXPIRES AT 615
AM CDT...

SEVERE STORMS HAVE ENDED OR MOVED OUT OF COUNTY. HOWEVER...MORE
THUNDERSTORMS WERE DEVELOPING IN THE AREA...REMAIN ALERT FOR POSSIBLE
ADDITIONAL WARNINGS.

LAT...LON 4523 9425 4540 9404 4528 9373 4505 9425
TIME...MOT...LOC 1106Z 226DEG 36KT 4541 9381

$$

KAT

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 7:29 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Washington	34 min
Sep 20, 7:56 PM CDT	Severe Thunderstorm Warning	MPX	Isanti	38 min
Sep 21, 1:06 AM CDT	Severe Thunderstorm Warning	MPX	Douglas	38 min
Sep 21, 1:36 AM CDT	Severe Thunderstorm Warning	MPX	Todd	54 min
Sep 21, 4:30 AM CDT	Wind Advisory	MPX	Benton, Brown, Chippewa, Douglas, Kandiyohi, Lac qui Parle and 15 more	10 hr
Sep 21, 5:36 AM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti	25 min
Sep 21, 5:45 AM CDT	Severe Thunderstorm Warning	MPX	Benton	18 min
Sep 21, 5:59 AM CDT	Severe Thunderstorm Warning	MPX	Sherburne	17 min
Sep 21, 6:13 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Isanti	22 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.