Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 310, NWS Twin Cities, MN

August 13, 2007Anoka County, Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 13, 2007, 8:43 PM CDT for Anoka County, Chisago County, Minnesota. It was in force for 62 min. 5 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: Aug 13, 2007, 8:43 PM CDT (01:43 UTC)
Expired: Aug 13, 2007, 9:45 PM CDT
In force: 62 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Anoka County, MN, Chisago County, MN

The radar

The Minneapolis radar (KMPX), 74 km from the middle of the area, began a volume at 01:42 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
Aug 13, 9:02 PM CDT	HAIL 0.75	North Branch, MN
Aug 13, 9:08 PM CDT	TSTM WND DMG	East Bethel, MN	1 3/4 INCH DIAMETER BRANCHES DOWN OFF TREES. METAL DOG KENNEL FLATTENED.
Aug 13, 9:22 PM CDT	TSTM WND DMG	Lino Lakes, MN	3 INCH DIAMETER BRANCH
Aug 13, 9:23 PM CDT	HAIL 0.75	Ham Lake, MN	146TH AND HWY 65
Aug 13, 9:23 PM CDT	HAIL 1.75	Ham Lake, MN	HAIL COVERING GROUND. ESTIMATED 65 MPH WINDS.

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
Aug 13, 6:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.7 hours before the alert went out and 76 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: 2096 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1133 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 409 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 140143
SVRMPX
MNC003-025-140245-
/O.NEW.KMPX.SV.W.0310.070814T0143Z-070814T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
843 PM CDT MON AUG 13 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 945 PM CDT

* AT 838 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS...CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 12 MILES NORTH OF RUSH CITY TO 12 MILES
  WEST OF NORTH BRANCH TO 25 MILES NORTHWEST OF ANDOVER...AND MOVING
  SOUTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RUSH CITY...
  NORTH BRANCH...
  EAST BETHEL...
  LINDSTROM...
  CHISAGO CITY...
  WYOMING...
  ANDOVER...

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.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
TUESDAY MORNING FOR SOUTHERN MINNESOTA.

LAT...LON 4540 9323 4539 9350 4526 9348 4514 9306
      4529 9302 4530 9283 4544 9266 4562 9293
      4572 9295 4570 9311 4543 9299

$$

JPR

2 follow-up statements

000 
WWUS53 KMPX 140228
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
927 PM CDT MON AUG 13 2007

MNC003-025-140245-
/O.CON.KMPX.SV.W.0310.000000T0000Z-070814T0245Z/
CHISAGO MN-ANOKA MN-
927 PM CDT MON AUG 13 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR ANOKA AND CHISAGO COUNTIES...

AT 921 PM CDT...ONE INCH SIZE HAIL WAS REPORTED BY A SPOTTER IN
THE CITY OF COON RAPIDS. 

AT 924 PM CDT...THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 8 MILES SOUTH OF ANDOVER TO 7 MILES EAST OF CENTERVILLE TO 9
MILES NORTHEAST OF SHAFER...AND MOVING SOUTHEAST AT 30 MPH.

SOME WEAK ROTATION WAS NOTED IN THIS STORM...ACROSS EXTREME
SOUTHERN ANOKA COUNTY...JUST SOUTHEAST OF COON RAPIDS AT 925 PM.

OTHER LOCATIONS IN THE WARNING INCLUDE CEDAR...WYOMING...STACY...
SHAFER...NORTH BRANCH...LINO LAKES...LINDSTROM...HAM LAKE...EAST
BETHEL AND CHISAGO CITY.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

LAT...LON 4540 9323 4539 9333 4519 9337 4514 9306
      4529 9302 4530 9283 4544 9266 4552 9282
      4551 9300 4543 9299

$$

JPR

000 
WWUS53 KMPX 140239
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
938 PM CDT MON AUG 13 2007

MNC003-025-140248-
/O.EXP.KMPX.SV.W.0310.000000T0000Z-070814T0245Z/
CHISAGO MN-ANOKA MN-
938 PM CDT MON AUG 13 2007

...THE SEVERE THUNDERSTORM WARNING FOR ANOKA AND CHISAGO COUNTIES
EXPIRES AT 945 PM CDT...

AT 935 PM CDT...GOLF BALL SIZE HAIL WAS REPORTED BY A SPOTTER IN
CIRCLE PINES. 

SEVERE STORMS WERE STILL IN FAR SOUTHERN ANOKA COUNTY. A NEW WARNING
MAY BE NEEDED FOR THIS STORM. CITIZENS ARE URGED TO REMAIN ALERT FOR
POSSIBLE ADDITIONAL WARNINGS.

LAT...LON 4540 9323 4539 9333 4519 9337 4514 9306
      4529 9302 4530 9283 4544 9266 4552 9282
      4551 9300 4543 9299

$$

JPR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 7:44 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs	61 min
Aug 13, 7:57 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	18 min
Aug 13, 8:08 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	52 min
Aug 13, 8:17 PM CDT	Severe Thunderstorm Warning	MPX	Isanti, Sherburne	58 min
Aug 13, 8:47 PM CDT	Severe Thunderstorm Warning	MPX	Stearns, Todd	58 min
Aug 13, 8:52 PM CDT	Tornado Warning	MPX	Anoka, Sherburne	23 min
Aug 13, 9:15 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Ramsey, Washington	60 min
Aug 13, 9:45 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Stearns, Wright	60 min
Aug 13, 10:42 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Wright	63 min
Aug 13, 10:46 PM CDT	Flash Flood Warning	MPX	Hennepin	119 min
Aug 13, 11:30 PM CDT	Severe Thunderstorm Warning	MPX	Washington	60 min
Aug 13, 11:37 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	53 min
Aug 13, 11:48 PM CDT	Flash Flood Warning	MPX	Dakota, Scott	117 min
Aug 13, 11:51 PM CDT	Severe Thunderstorm Warning	MPX	Scott	29 min
Aug 14, 12:26 AM CDT	Flash Flood Warning	MPX	Goodhue	2 hr
Aug 14, 12:29 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	48 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.