Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 372, NWS Twin Cities, MN

September 20, 2007Carver County, Hennepin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2007, 5:07 PM CDT for Carver County, Hennepin County, Minnesota. It was in force for 53 min. 9 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: Sep 20, 2007, 5:07 PM CDT (22:07 UTC)
Expired: Sep 20, 2007, 6:00 PM CDT
In force: 53 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Carver County, MN, Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 15 km from the middle of the area, began a volume at 22:06 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
Sep 20, 5:20 PM CDT	HAIL 0.88	Plymouth, MN
Sep 20, 5:20 PM CDT	HAIL 1.75	Watertown, MN
Sep 20, 5:22 PM CDT	HAIL 0.88	Maple Plain, MN
Sep 20, 5:27 PM CDT	HAIL 0.75	Loretto, MN
Sep 20, 5:34 PM CDT	TSTM WND DMG	Watertown, MN	TREES DOWN...JUST NORTH OF TOWN. 4-6 INCH BRANCHES DOWN IN TOWN.
Sep 20, 5:38 PM CDT	HAIL 0.88	Plymouth, MN
Sep 20, 5:50 PM CDT	TSTM WND DMG	Golden Valley, MN	TREES DOWN...POWER OUT.
Sep 20, 5:50 PM CDT	HAIL 0.75	New Hope, MN
Sep 20, 5:50 PM CDT	HAIL 1	Golden Valley, 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
Sep 20, 3:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.1 hours before the alert went out and 13 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 202207
SVRMPX
MNC019-053-202300-
/O.NEW.KMPX.SV.W.0372.070920T2207Z-070920T2300Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  CARVER COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 600 PM CDT

* AT 506 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 65 MPH.  THIS STORM WAS LOCATED 17 MILES WEST OF
  ROGERS...OR ABOUT 29 MILES NORTHEAST OF HUTCHINSON...AND MOVING
  EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CHASKA...
  CHANHASSEN...
  EXCELSIOR...
  MINNETONKA...
  EDEN PRAIRIE...
  THE LAKE MINNETONKA AREA...
  ROGERS...
  PLYMOUTH...
  HOPKINS...
  MAPLE GROVE...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT THURSDAY EVENING
FOR CENTRAL MINNESOTA.

LAT...LON 4472 9402 4497 9400 4498 9377 4509 9373
      4522 9358 4524 9352 4514 9330 4491 9325
      4480 9358 4471 9371
TIME...MOT...LOC 2207Z 254DEG 37KT 4512 9386

$$

1 follow-up statement

000 
WWUS53 KMPX 202236
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
534 PM CDT THU SEP 20 2007

MNC019-053-202300-
/O.CON.KMPX.SV.W.0372.000000T0000Z-070920T2300Z/
HENNEPIN MN-CARVER MN-
534 PM CDT THU SEP 20 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR CARVER AND HENNEPIN COUNTIES...

AT 529 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 65 MPH.  THIS STORM WAS LOCATED NEAR ROGERS...OR
ABOUT OVER ROGERS...AND MOVING EAST AT 40 MPH.

NICKEL SIZE HAIL WAS REPORTED IN MAPLE PLAIN AT 525 PM.  
TREES WERE REPORTED DOWN JUST NORTH OF WATERTOWN 534 PM. 

OTHER LOCATIONS IN THE WARNING INCLUDE WOODLAND...WAYZATA...
SHOREWOOD...ORONO...MOUND...MINNETONKA...MINNETRISTA...MEDICINE
LAKE...HAMEL AND EXCELSIOR.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4498 9384 4498 9377 4509 9373 4522 9358
      4524 9352 4514 9330 4491 9326 4482 9354
      4471 9371 4471 9373
TIME...MOT...LOC 2234Z 254DEG 37KT 4519 9348

$$

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, 10:14 AM CDT	Severe Thunderstorm Warning	MPX	Swift	31 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, 5:30 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.