Alert archive / Iowa / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 118, NWS La Crosse, WI

August 1, 2000Allamakee County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Aug 1, 2000, 6:42 PM CDT for Allamakee County, Iowa. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 1, 2000, 6:42 PM CDT (23:42 UTC)
Expired: Aug 1, 2000, 7:15 PM CDT
In force: 33 min
Issued by: NWS La Crosse, WI
Area: Whole counties

County Allamakee County, IA

The radar

The La Crosse radar (KARX), 62 km from the middle of the area, began a volume at 23:44 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 1, 7:00 PM CDT	Thunderstorm Wind 56 E	Waukon, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 1, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.7 hours before the alert went out and 199 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: 607 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1260 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 133 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 KARX 012343
SVRLSE
IAC005-020015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
642 PM CDT TUE AUG 1 2000

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALLAMAKEE COUNTY IN NORTHEAST IOWA

* UNTIL 715 PM CDT

* AT 642 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES WEST OF HARPERS FERRY...OR ABOUTe 10
  MILES SOUTH OF LANSING...MOVING SOUTHEAST AT 35 MPH.

DAMAGING WIND GUSTS ARE THE MAIN THREAT FROM THESE STORMS. FOR YOUR
PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

BOYNE

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 1, 2:45 PM CDT, 3 hours 57 minutes earlier.

Area forecast discussion, Aug 1, 2:45 PM CDT, 3 hours 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
245 PM CDT TUE AUG 1 2000

DATA ANALYSIS NOW SHOWING THUNDERSTORM DEVELOPMENT OCCURRING IN AREA
OF GOOD INSTABILITY/FORCING ALONG INTERSECTION OF OUTFLOW FROM
ELEVATED CONVECTION OVER WISCONSIN AND THE FRONTAL BOUNDARY NORTH OF
LOW CENTERED NORTHWEST OF KRST.  THIS WILL BE THE MAIN CONCERN THIS
EVENING AS FRONT/STORMS MOVE SOUTHEAST THIS EVENING AND TONIGHT.

THE FRONT SHOULD BE LOCATED ACROSS THE EXTREME SOUTHERN PORTION OF
THE FORECAST AREA WEDNESDAY MORNING.  THIS WILL ALLOW SCATTERED
ACTIVITY TO CONTINUE INTO THE MORNING HOURS THERE.  01/12Z AVN
SHOWING THE BEST HANDLE ON THE CURRENT SITUATION AS WELL AS THE
SLOWER PROGRESSION OF THE OVERALL SYSTEM.

SURFACE HIGH PRESSURE MOVES INTO THE FORECAST AREA WEDNESDAY AS
ANOTHER UPPER DISTURBANCE MOVES ACROSS NORTHEAST WISCONSIN.  MOISTURE
TOO LIMITED TO WARRANT POPS AT THIS TIME.  AS THE HIGH BUILDS IN...
CLASSIC SETUP FOR VALLEY FOG WEDNESDAY NIGHT/THURSDAY MORNING.
WILL INTRODUCE THIS INTO THE ZONES.

MEAN PATTERN DOES NOT CHANGE MUCH THROUGH THE REMAINDER OF THE PERIOD
AS RIDGING REMAINS INTACT OVER THE WEST.  NEXT STRONG DISTURBANCE
DOES PUSH THE RIDGE SOUTH FRIDAY...ALLOWING ANOTHER SURFACE WAVE TO
MOVE ACROSS THE NORTHERN STATES.  THIS WAVE SHOULD AFFECT THE
FORECAST AREA SATURDAY AND SUNDAY.  FORECAST ALREADY REFLECTS THIS...
WILL CONTINUE PRECIPITATION CHANCES FOR SATURDAY AND EXTEND INTO
SUNDAY.  TEMPERATURES NEAR NORMAL LOOK REASONABLE.

.LSE...NONE.

KRC

In the hours before

Local storm report, Aug 1, 3:13 PM CDT, 3 hours 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
313 PM CDT TUE AUG 1 2000

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0240 PM    MAZEPPA                   MN   .75 INCH HAIL
08/01/00   WABASHA                        PEA TO DIME SIZE HAIL IN
                                          AND AROUND TOWN.

GUYER

N

Local storm report, Aug 1, 3:21 PM CDT, 3 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
321 PM CDT TUE AUG 1 2000

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0240 PM    MAZEPPA                   MN   .75 INCH HAIL
08/01/00   WABASHA                        PEA TO DIME SIZE HAIL IN
                                          AND AROUND TOWN.

0305 PM    POTSDAM                   MN   1 INCH HAIL
08/01/00   OLMSTED                        QUARTER SIZED HAIL.
                                          REPORTED BY SHERIFFS
                                          OFFICE.

0305 PM    ELGIN                     MN   1 INCH HAIL
08/01/00   WABASHA                        QUARTER SIZED HAIL.
                                          REPORTED BY SHERIFFS
                                          OFFICE.

GUYER

N

Special weather statement, Aug 1, 6:20 PM CDT, 22 minutes before

MNZ079-086>088-094>096-020000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
620 PM CDT TUE AUG 1 2000

THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELED FOR THE FOLLOWING
COUNTIES:

IN SOUTHEAST MINNESOTA
     DODGE...HOUSTON...OLMSTED...WINONA...MOWER...FILLMORE AND
     WABASHA

INCLUDING THE CITIES OF...WABASHA...MANTORVILLE...DODGE CENTER...
ROCHESTER...PRESTON...AUSTIN AND CALEDONIA

THE THREAT OF SEVERE WEATHER HAS MOVED INTO NORTHEAST
IOWA...THEREFORE THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED
FOR ALL OF SOUTHEAST MINNESOTA.

THOMPSON

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 1, 4:41 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	64 min
Aug 1, 5:20 PM CDT	Severe Thunderstorm Warning	ARX	Winneshiek	55 min
Aug 1, 5:26 PM CDT	Tornado Warning	ARX	Winneshiek	64 min
Aug 1, 5:45 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee	60 min
Aug 1, 6:19 PM CDT	Severe Thunderstorm Warning	ARX	Clayton, Fayette	56 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2000 Every severe thunderstorm warning in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.