Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 253, NWS Twin Cities, MN

July 26, 2007Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 26, 2007, 3:46 PM CDT for Chisago County, Minnesota. It was in force for 59 min. 1 report 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: Jul 26, 2007, 3:46 PM CDT (20:46 UTC)
Expired: Jul 26, 2007, 4:45 PM CDT
In force: 59 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Chisago County, MN

The radar

The Minneapolis radar (KMPX), 102 km from the middle of the area, began a volume at 20:46 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
Jul 26, 4:01 PM CDT	TSTM WND DMG	Rush City, MN	TREES DOWNED

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
Jul 26, 1:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.8 hours before the alert went out and 103 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: 1237 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1075 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: -10 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 262046
SVRMPX
MNC025-262145-
/O.NEW.KMPX.SV.W.0253.070726T2046Z-070726T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
346 PM CDT THU JUL 26 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 445 PM CDT

* AT 342 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 5 MILES NORTHWEST OF RUSH
  CITY...OR ABOUT 13 MILES NORTHEAST OF CAMBRIDGE...AND MOVING EAST
  AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RUSH CITY...
  INTERSTATE 35 BETWEEN HARRIS AND ROCK CREEK...

STAY INDOORS...AND AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
THURSDAY EVENING FOR SOUTHERN MINNESOTA.

LAT...LON 4573 9313 4563 9313 4562 9289 4564 9289
      4573 9285

$$

KAT

1 follow-up statement

000 
WWUS53 KMPX 262142
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
442 PM CDT THU JUL 26 2007

MNC025-262152-
/O.EXP.KMPX.SV.W.0253.000000T0000Z-070726T2145Z/
CHISAGO MN-
442 PM CDT THU JUL 26 2007

...THE SEVERE THUNDERSTORM WARNING FOR CHISAGO COUNTY EXPIRES AT 445
PM CDT...

SEVERE STORMS WERE ABOUT TO MOVE OUT OF THE COUNTY. RELAY ANY SEVERE 
WEATHER TO LOCAL LAW ENFORCEMENT FOR RELAY TO THE NATIONAL WEATHER 
SERVICE. 

LAT...LON 4573 9313 4563 9313 4562 9289 4564 9289
      4573 9285

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 12:35 PM CDT	Severe Thunderstorm Warning	MPX	Todd	40 min
Jul 26, 2:50 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs	40 min
Jul 26, 2:55 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin	50 min
Jul 26, 3:07 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Ramsey	53 min
Jul 26, 3:34 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	41 min
Jul 26, 3:50 PM CDT	Severe Thunderstorm Warning	MPX	Washington	55 min
Jul 26, 4:44 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault	46 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.