Alert archive / Minnesota / Flash Flood Warnings in 2011
Flash Flood Warning 11, NWS Twin Cities, MN
NWS Twin Cities, MN issued this flash flood warning at Jul 23, 2011, 11:32 PM CDT for Steele County, Minnesota. It was in force for 3 hr. 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 23, 2011, 11:32 PM CDT (04:32 UTC)
- Expired
- Jul 24, 2011, 2:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Flood severity
- None
County Steele County, MN
The radar
The Minneapolis radar (KMPX), 89 km from the middle of the area, began a volume at 04:32 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 24, 2:00 AM CDT | HEAVY RAIN 4 | 5 S Deerfield, 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 00:00Z, 4.5 hours before the alert went out and 90 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
- 2128 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 814 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 11.7
The text
As transmitted, in the capitals the NWS used until 2016.
242 WGUS53 KMPX 240432 FFWMPX MNC147-240730- /O.NEW.KMPX.FF.W.0011.110724T0432Z-110724T0730Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1132 PM CDT SAT JUL 23 2011 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHERN STEELE COUNTY IN SOUTH CENTRAL MINNESOTA... * UNTIL 230 AM CDT * AT 1131 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... OWATONNA. THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES... CRANE CREEK...MAPLE CREEK...TURTLE CREEK...STRAIGHT RIVER... MIDDLE FORK ZUMBRO RIVER...MEDFORD CREEK...AND TRIBUTARY STRAIGHT RIVER. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 4414 9305 4402 9305 4401 9340 4414 9341 $$
2 follow-up statements
251 WGUS73 KMPX 240641 FFSMPX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 141 AM CDT SUN JUL 24 2011 MNC147-240730- /O.CON.KMPX.FF.W.0011.000000T0000Z-110724T0730Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ STEELE MN- 141 AM CDT SUN JUL 24 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN STEELE COUNTY UNTIL 230 AM CDT... AT 136 AM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING ACROSS NORTHERN AND CENTRAL STEELE COUNTY. RADAR ESTIMATES SUGGEST THAT AROUND 4 INCHES OF RAIN HAS OCCURRED NEAR OWATONNA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... OWATONNA. STREET FLOODING HAS BEEN REPORTED IN A FEW AREAS OF OWATONNA. PRECAUTIONARY/PREPAREDNESS ACTIONS... BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 4414 9305 4402 9305 4401 9340 4414 9341 $$
366 WGUS73 KMPX 240726 FFSMPX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 226 AM CDT SUN JUL 24 2011 MNC147-240741- /O.EXP.KMPX.FF.W.0011.000000T0000Z-110724T0730Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ STEELE MN- 226 AM CDT SUN JUL 24 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHERN STEELE COUNTY WILL BE ALLOWED TO EXPIRE AT 230 AM CDT... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 4414 9305 4402 9305 4401 9340 4414 9341 $$ JPC
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 8:41 PM CDT | Special Weather Statement | MPX | Blue Earth | 34 min |
| Jul 23, 8:43 PM CDT | Special Weather Statement | MPX | Blue Earth | 47 min |
| Jul 23, 9:07 PM CDT | Special Weather Statement | MPX | Le Sueur | 38 min |
| Jul 23, 9:27 PM CDT | Areal Flood Advisory | MPX | Blue Earth, Le Sueur, Rice, Waseca | 3 hr |
| Jul 23, 9:49 PM CDT | Special Weather Statement | MPX | Ramsey | 41 min |
| Jul 23, 11:17 PM CDT | Areal Flood Advisory | MPX | Steele | 3 hr |
| Jul 24, 2:32 AM CDT | Areal Flood Advisory | MPX | Steele | 57 min |
Nearby
Flash Flood Warnings in Minnesota, 2011Every flash flood warning in 2011
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.