Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 377, NWS Twin Cities, MN

September 20, 2007Anoka County, Hennepin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2007, 6:30 PM CDT for Anoka County, Hennepin County, Minnesota. It was in force for 60 min. 4 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, 6:30 PM CDT (23:30 UTC)
Expired: Sep 20, 2007, 7:30 PM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Anoka County, MN, Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 41 km from the middle of the area, began a volume at 23:29 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, 6:40 PM CDT	HAIL 1	Anoka, MN
Sep 20, 7:00 PM CDT	HAIL 0.88	Coon Rapids, MN	HWY 10 AND MAIN STREET
Sep 20, 7:03 PM CDT	HAIL 1	Coon Rapids, MN
Sep 20, 7:11 PM CDT	HAIL 1	Blaine, 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, 11.5 hours before the alert went out and 43 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 202330
SVRMPX
MNC003-053-210030-
/O.NEW.KMPX.SV.W.0377.070920T2330Z-070921T0030Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 730 PM CDT

* AT 625 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR ROGERS...OR ABOUT 22
  MILES NORTHWEST OF MINNEAPOLIS...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ANOKA...
  BROOKLYN PARK...
  ANDOVER...
  COON RAPIDS...
  FRIDLEY...
  BLAINE...
  EAST BETHEL...

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 4514 9314 4511 9322 4504 9326 4508 9337
      4512 9370 4523 9353 4538 9340 4532 9302
TIME...MOT...LOC 2330Z 266DEG 40KT 4521 9347

$$

1 follow-up statement

000 
WWUS53 KMPX 202348
SVSMPX

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

MNC003-053-210030-
/O.CON.KMPX.SV.W.0377.000000T0000Z-070921T0030Z/
ANOKA MN-HENNEPIN MN-
648 PM CDT THU SEP 20 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR HENNEPIN AND ANOKA COUNTIES...

AT 640 PM CDT...QUARTER SIZE HAIL WAS REPORTED IN ANOKA.

AT 643 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM
WAS LOCATED NEAR ANOKA...OR ABOUT OVER ANOKA...AND MOVING EAST AT 30
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE SPRING LAKE PARK...OAK PARK...
LEXINGTON...CEDAR...ROGERS...OSSEO...MAPLE GROVE...HAM LAKE...FRIDLEY
AND EAST BETHEL.

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

LAT...LON 4514 9314 4511 9322 4504 9326 4508 9337
      4512 9370 4523 9353 4538 9340 4532 9302
TIME...MOT...LOC 2348Z 275DEG 26KT 4519 9335

$$

DWE

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, 5:07 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, 6:51 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.