Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 12, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 21, 2007, 11:57 AM CDT for Isanti County, Minnesota. It was in force for 33 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
- Apr 21, 2007, 11:57 AM CDT (16:57 UTC)
- Expired
- Apr 21, 2007, 12:30 PM CDT
- In force
- 33 min
- Issued by
- NWS Twin Cities, MN
- Area
- Counties, with a storm outline in the text
County Isanti County, MN
The radar
The Minneapolis radar (KMPX), 73 km from the middle of the area, began a volume at 16:58 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 |
|---|---|---|---|
| Apr 21, 12:08 PM CDT | HAIL 0.75 | Cambridge, MN |
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, 5.0 hours before the alert went out and 73 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1697 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 341 m²/s²
- 0-3 km storm-relative helicity
- 335 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KMPX 211657 SVRMPX MNC059-211730- /O.NEW.KMPX.SV.W.0012.070421T1657Z-070421T1730Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1157 AM CDT SAT APR 21 2007 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... ISANTI COUNTY IN EAST CENTRAL MINNESOTA... * UNTIL 1230 PM CDT * AT 1154 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM... CAPABLE OF PRODUCING LARGE HAIL. THIS STORM WAS LOCATED 10 MILES SOUTHWEST OF ISANTI...OR ABOUT 13 MILES SOUTHEAST OF PRINCETON... AND MOVING NORTHEAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... ISANTI... CAMBRIDGE... 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 4547 9357 4541 9349 4542 9303 4567 9321 $$ RJN
1 follow-up statement
000 WWUS53 KMPX 211722 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1221 PM CDT SAT APR 21 2007 MNC059-211741- /O.EXP.KMPX.SV.W.0012.000000T0000Z-070421T1730Z/ ISANTI MN- 1221 PM CDT SAT APR 21 2007 ...THE SEVERE THUNDERSTORM WARNING FOR ISANTI COUNTY EXPIRES AT 1230 PM CDT... SEVERE STORMS HAVE WEAKENED. HOWEVER...MORE THUNDERSTORMS WERE DEVELOPING NEAR DALBO...AND DIME SIZE HAIL WILL REMAIN POSSIBLE IN ISANTI COUNTY UNTIL ABOUT 1245 PM. LAT...LON 4547 9357 4541 9349 4542 9303 4567 9321 $$ RJN
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 3:46 AM CDT | Wind Advisory | MPX | Blue Earth, Brown, Faribault, Freeborn, Martin, Redwood and 4 more | 16 hr |
| Apr 21, 6:12 AM CDT | Severe Thunderstorm Warning | MPX | Stearns | 40 min |
| Apr 21, 9:47 AM CDT | Severe Thunderstorm Warning | MPX | McLeod, Meeker, Renville, Sibley, Wright | 58 min |
| Apr 21, 11:31 AM CDT | Severe Thunderstorm Warning | MPX | Sherburne | 29 min |
| Apr 21, 12:16 PM CDT | Severe Thunderstorm Warning | MPX | Chisago | 44 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2007Every 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.