Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 29, NWS Twin Cities, MN

May 23, 2007Hennepin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 23, 2007, 2:06 PM CDT for Hennepin County, Minnesota. It was in force for 39 min. 6 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: May 23, 2007, 2:06 PM CDT (19:06 UTC)
Expired: May 23, 2007, 2:45 PM CDT
In force: 39 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 16 km from the middle of the area, began a volume at 19:08 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
May 23, 2:10 PM CDT	TSTM WND DMG	Plymouth, MN	SEMI TRAILOR TIPPED OVER IN PLYMOUTH AT HIGHWAY 55 AND 494. SPOTTER SAID HE WITNESSED A DOWNBURST.
May 23, 2:10 PM CDT	HAIL 0.88	Plymouth, MN
May 23, 2:15 PM CDT	TSTM WND DMG	Plymouth, MN	CO RD 9 EAST OF 494. POWER LINES DOWN.
May 23, 2:15 PM CDT	HAIL 1	Plymouth, MN	1 MILE EAST OF HIGHWAY 55 AND 494.
May 23, 2:15 PM CDT	HAIL 2	Crystal, MN	MAINLY 1 TO 1.5 INCH STONES. BIGGEST HAIL EGG SIZED.
May 23, 2:30 PM CDT	HAIL 1.75	Crystal, MN	NEAR CRYSTAL AIRPORT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 7.1 hours before the alert went out and 16 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: 84 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 164 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 231906
SVRMPX
MNC053-231945-
/O.NEW.KMPX.SV.W.0029.070523T1906Z-070523T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
206 PM CDT WED MAY 23 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 245 PM CDT

* AT 204 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING LARGE HAIL.  THIS STORM WAS LOCATED NEAR
  EXCELSIOR...OR ABOUT 16 MILES WEST OF MINNEAPOLIS...AND WAS
  MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PLYMOUTH...
  MAPLE GROVE...
  LAKE MINNETONKA AREA...

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 4490 9374 4490 9354 4507 9328 4519 9356

$$
TDK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 2:25 PM CDT	Tornado Warning	MPX	Anoka, Hennepin	35 min
May 23, 2:39 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey, Washington	51 min
May 23, 2:43 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault	62 min
May 23, 3:12 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	46 min
May 23, 3:18 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	42 min
May 23, 3:22 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	53 min
May 23, 3:29 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey, Washington	61 min
May 23, 3:42 PM CDT	Severe Thunderstorm Warning	MPX	Rice	46 min
May 23, 4:07 PM CDT	Tornado Warning	MPX	Goodhue	53 min
May 23, 4:18 PM CDT	Tornado Warning	MPX	Dakota	20 min
May 23, 5:01 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	44 min
May 23, 6:49 PM CDT	Severe Thunderstorm Warning	MPX	Faribault	41 min
May 23, 6:57 PM CDT	Flash Flood Warning	MPX	Faribault, Freeborn	3 hr

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.